TM 11-5855-297-12&P
TECHNICAL MANUAL
OPERATOR’S AND UNIT
MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS
AND SPECIAL TOOLS LIST)
AIMING LIGHT, INFRARED
AN/PAQ-4A
(NSN 5855-01-312-5160)
HEADQUARTERS, DEPARTMENT OF THE ARMY 1 5 S E P T E M B E R 1 9 9 0
D i s t r i b u t i o n a u t h o r i z e d t o U . S . G o v e r n m e n t a g e n c i e s a n d t h e i r c o n t r a c t o r s f o r o f f i c i a l u s e o r f o r a d m i n i s t r a t i v e o r o p e r a t i o n a l p u r p o s e s o n l y T h i s d e t e r m i n a t i o n w a s m a d e on 14 June 1990. O t h e r r e q u e s t s f o r t h e d o c u m e n t w i l l b e r e f e r r e d t o C o m m a n d e r , U . S . A r m y C o m m u n i c a t i o n s -E l e c t r o n i c s C o m m a n d a n d F o r t M o n m o u t h , A T T N : A M S E L - L C – M E - P , N e w J e r s e y 0 7 7 0 3 - 5 0 0 0 .
DESTRUCTION NOTICE – Destroy by any method that will p r e v e n t d i s c l o s u r e o f c o n t e n t s o r r e c o n s t r u c t i o n o f t h e d o c u m e n t .
TM 11-5855-297-12&P C1
Change HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 1 Washington, DC, 15 February 1995
Operator’s and Unit Maintenance Manual (Including Repair Parts and Special Tools list)
LIGHT, AIMING, INFRARED AN/PAQ-4A
(NSN 5855-01-312-5160)(EIC:IRN)
TM 11-5855-297-12&P, 15 September 1990, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a bar adjacent to the identification number.
Remove pages Insert pages
1-17 thru 2-6 1-17 thru 2-6
2-31 thru 2-34 2-31 thru 2-40
D-1 and E-O D-1 and E-O
2. File this change sheet in front of the manual for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 July 1990. Other requests for this document will be referred to: Commander, US Army Communications - Electronics Commandant Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth,
New Jersey 07703-5007.
DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of contents or reconstruction of the document.
By Order of the Secretaty of the Army
GORDON R. SULLIVAN General, United States Army
Chief of Staff
Official:
Administrative Assistant to the Secretary of the Army
08148
DISTRIBUTION:
To be distributed in accordance with DA Form 12-36-E, block 8468 requirements for TM 11-5855-297-12&P.
WARNING
Although the infrared light beam emitted by the aiming light is considered eye safe, suitable precautions must be taken to avoid overexposure to the infrared beam of light. Precautionary measures include the following:
Avoid viewing the infrared emitter/lens directly with naked eye, Increasing the distance from the eye to the light source greatly reduces the risks of overexposure.
Avoid viewing the emitter/lens directly along the optical axis of the infrared light beam. Especial-ly avoid viewing the emitter/lens along the op-tical axis of the infrared light beam through stabilized optics such as binoculars or tele-scopes.
WARNING
MERCURY BATTERIES
The BA-1576/U battery contains mercury and should be handled in the following manner:
● Do not heat, incinerate, crush, puncture, dis-assemble, or otherwise mutilate the batteries. ● Do not short circuit battery terminals,
● Do not discard mercury batteries, Turn them in to a Property Disposal Officer in accordance with DLSC Handbook 41601.
WARNING
LITHIUM BATTERIES
Lithium batteries used with Aiming Light, Infrared AN/PAQ-4A contain sulfur dioxide and may explode if handled improperly. Do not short circuit, incinerate, mutilate, or attempt to charge these batteries. Serious in-jury to personnel may result from failure to comply with this warning.
WARNING
Observe the following precautions when handling lith-ium batteries to minimize the chance of personal injury or equipment damage. ● ● ● ● ● ● ●
DO NOT parallel batteries without diode protec-tion.
DO NOT short-circuit battery terminals. DO NOT heat, incinerate, crush, puncture, dis-assemble, or otherwise mutilate the batteries. DO NOT attempt to recharge the batteries. DO NOT bypass the internal fuse or replace it with a fuse of a different rating,
DO NOT store batteries in equipment during long periods of disuse (over 30 days), TURN EQUIPMENT OFF immediately if you: 1) detect overheating in battery compartment, 2) hear hissing sound of venting battery, or 3) smell irritating sulfur dioxide gas.
Allow battery to cool for 30 to 60 minutes before removal. Ensure adequate ventilation if venting occurs. Avoid prolonged or repeated breathing of fumes.
DO NOT discard lithium batteries. Turn them in to a Property Disposal Officer in accordance with DLSC Handbook 41601,
WARNING
AA ALKALINE BATTERY BA-3058/U
Do not dispose of Alkaline Battery BA-3058/U in fire. Do not short circuit or otherwise tamper with battery. Return batteries to Property Disposal Officer for disposal in ac-cordance with DLSC Handbook 41601.
FIRST AID
First aid required should be administered in accordance with FM 21-11, First Aid for soldiers.
Technical Manual HEADQUARTERS DEPARTMENT OF THE ARMY No. 11-5855-297-12&P Washington, DC
1 5 S e p t e m b e r 1 9 9 0
OPERATOR’S AND UNIT
MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS
AND SPECIAL TOOLS LIST)
FOR
AIMING LIGHT,
INFRARED AN/PAQ-4A
(NSN 5855-01-312-5160)
C u r r e n t a s o f 3 0 J u l y 1 9 9 0
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publi-cations and Blank Forms) direct to: Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-ME-PS, Fort Monmouth, New Jersey, 07703-5000, In either case a reply will be furnished direct to you.
CHAPTER 1.
Section I.
Il.
Ill.
TABLE OF CONTENTS
Page
How To Use This Manual. ., . . v
INTRODU(YHON . . . 1-1
General Information . . . 1-2
Equipment Description . . . 1-4
Principles of Operation. 1-15
Instructions ... .. ... ...2-0
CHAPTER 2. OPERATING
Section 1.
Il.
Ill.
IV..
CHAPTER 3.
Description and Use of
Operator’s Controls and
Indicators . . . 2-0
Preventive Maintenance Checks
and Services (PMCS). . . 2-4
Operation Under Usual
Conditions . . . 2-9
Operation Under Unusual
Conditions . . . ...2-32
OPERATOR MAINTENANCE
INSTRUCTIONS . . . 3-1
P r o c e d u r e s . . . 3 - 1
Section I. Operator Troubleshooting
II. Operator Maintenance
Procedures . . . 3-5
TABLE OF CONTENTS (CONT.)
Page
CHAPTER 4.1 UNIT MAINTENANCE ]. . . 4-1
Section I. Repair Parts, Special Too!s, Test, Measurement and Diagnostic Equipment (TMDE), and Support Equipment . . . 4-1 II. Service Upon Receipt. . . . 4-2 III. Unit Preventive Maintenance
Checks and Services (PMCS) 4-3 IV. Unit Maintenance Procedures 4-6
APPENDIX A. REFERENCES . . . A-1
B. MAINTENANCE ALLOCATION
. .B-1
Section I. Introduction . . . B-1 Il. Maintenance Allocation Chart , B7 Ill. Tools and Test Equipment
Requirements . . . B-8 lV, Remarks . . . B-9 Illus.. Page Figure
APPENDIX C. COMPONENTS OF END
ITEM LIST . . . C-0
Section I. Introduction. . . C-0 II. Integral Components of
End ltem . . . C-3 C-1 III. Basic Issue Items. C-5 C-2
TABLE OF CONTENTS (CONT.)
APPENDIX
D. Section I.APPENDIX E.
Section I. Il. Illus. Page FigureADDITIONAL
AUTHORIZATION LIST...
. . . D-0 Introduction ... . . . ...D-0EXPENDABLE
SUPPLIES AND
MATERIELS LIST
. . . E-0 Introduction . . . ...E-0 Expendable Suppliesand Materiels List. ... E-2
APPENDIX F. REPAIR PARTS AND
SPECIAL TOOLS LIST
. . F-1 Section I. Il. GROUP 00.. 01. Section III. IV. Introduction . . . F-1 Repair Parts List . . . F-1-1 Aiming Light, InfraredAN/PAQ-4A . ... . . . F-1-1 F-1 Aiming Light Assembly... F-2-1 F-2 Special Tools List
(Not applicable) . . . . Cross-Reference
Indexes . . . F-I-0 National Stock Number
Index . . . F-I-1 Part Number Index . . . F-I-2 Figure and Item
Number Index . . . F-I-3
HOW TO USE THIS MANUAL
● Usage
You must familiarize yourself with the entire mainten-ance procedure before beginning the maintenmainten-ance task. Read and follow all warning notices.
● Manual Overview
The contents of each chapter are listed at the begin-ning of the chapter, This listing includes the para-graph number, parapara-graph title, and page number.
● Special Feature
A locator is provided on the right-hand border of the front cover. This gives the location of the information most frequently used, To find the topic OPERATING INSTRUCTIONS, open the manual to the correct page by using the black tab on the side of the manual that lines up with the topic OPERATING INSTRUC-TIONS.
CRIII011
Figure 1-1. Aiming Light, Infrared AN/PAQ-4A.
CHAPTER 1
INTRODUCTION
Para 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9 1-10 1-11 1-12 1-13 1-14 Page Scope . . . 1-2Consolidated Index of Army Publications
and Blank Forms . . . 1-2 Maintenance Forms, Records
and Reports . . . 1-2 Reporting Equipment Improvement
Recommendations (EIR). … ……… … 1-3 Destruction of Army Electronics
Materiel . . . 1-3 Equipment Purpose, Capabilities,
and Features . . . 1-4 Location and Description of
Components . . . 1-8 Equipment Data.... .. . .. . . 1-14 Warranty . . . ... 1-14 General Functional Description, . . . 1-15 Mechanical Functions . . . 1-16 Optical Functions . . . 1-17
Electronic Circuit Functions.... .. ... .. 1-17
Control Circuit Functions... . . 1-17
Section I.
GENERAL INFORMATION
1-1. SCOPE
This manual contains instructions for the operation and unit maintenance of the Aiming Light, Infrared AN/PAQ-4A.
References are listed in Appendix A. The maintenance allocation chart (MAC) appears in Appendix B. The re-pair parts and special tools list appears in Appendix F.
1-2. CONSOLIDATED INDEX OF ARMY PUBLI-CATIONS AND BLANK FORMS
Refer to the latest issue of DA Pam 25-30 to determine whether there are new editions, changes or additional publications pertaining to the equipment.
1-3. MAINTENANCE FORMS, RECORDS, AND REPORTS
a. Reports of Maintenance and Unsatisfactory Equip-ment. Department of the Army forms and procedures used for equipment maintenance will be those pre-scribed by DA Pam 738-750, as contained in Mainten-ance Management Update.
b. Reporting of Item and Packaging Discrepancies. Fill out and forward SF 364 (Report of Discrepancy (ROD)) as prescribed in AR 735-11-2/DLAR 4140.55/ SECNAVINST 4355.18/AFR 400-54/ MCO 4430.3J.
c. Transportation Discrepancy Report (TDR) (SF361).
Fill out and forward Transportation Discrepancy Report (TDR) (SF 361) as prescribed in AR 55-38 /NAVSUPlNST 4610.33C/AFR 75-18/MCO P4610.19D/DLAR 4500.15.
1-4. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).
If your Aiming Light needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don’t like about your equipment. Let us know why you don’t like the design or performance. Put it on an SF 368 (Product Quality Deficiency Report). Mail it to: Commander, US Army Communications-Electron-ics Command and Fort Monmouth, ATTN: AMSEL-PA-MA-D, Fort Monmouth, New Jersey 07703-5000. We’ll send you a reply.
1-5. DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent ene-my use shall be in accordance with TM 750-244-2.
Section Il.
Equipment Description
1-6. EQUIPMENT PURPOSE, CAPABILITIES, AND FEATURES
a. Purpose of Aiming Light. The aiming light increases
the accuracy of your fire at night. After it is properly in-stalled and zeroed on your weapon, and turned ON, the aiming light sends out an invisible pulsing light beam along the line of sight. The light beam can be seen with night vision equipment such as Night Vision Goggles AN/PVS-5, (TM 5855-238-10) or AN/PVS-7, (TM 11-5855-262-10). While wearing your night vision goggles, place the projected spot of light on the target and fire. The fired round should impact in the center of the spot of light on the target. You, therefore, can fire your wea-pon accurately at night by placing the spot of light on your target.
● When the aiming light is mounted on the M16A1 or M16A2 the rifle hand guard only allows the aiming light to be used in the momentary ON position when finger or thumb pressure is applied to the switch handle. This pro-vision prevents the accidental emission of light energy from the aiming light until it is ready to be used for firing the weapon. The switch can be activated and left in the permanent ON position when the aiming light is mount-ed on other weapons. The aiming light uses the AN/PVS-4 mounting bracket to mount to weapons other than the M16A1/A2
NOTE
It is only necessary to activate the aiming light a few seconds prior to firing. This re-duces possibility of detection by the enemy. Remember! If the enemy is using night vision equipment they can detect the infrared light source used in the aiming light.
Figure 1-2. Equipment Used by the Operator. 1 - 6
b. Capabilities and Features.
(1) As an operator, you will need to familiarize yourself with the following components.
● Batteries
● Scattershield
● Boresight aperture
● Mounting bracket M16A1/A2
● Carrying bag
● Boresight mandrel
● Shipping and storage case
(2) You should also know these features about the aim-ing light:
● Easily mounted to the M16A1/A2 rifles, M60
mach-ine gun.
● Self-contained, battery-powered.
● Easy to maintain.
● Light weight and easily carried in a carrying bag.
● Can be used in extreme cold to -65° F (-54° C)
1-7. LOCATION AND DESCRIPTION OF COM-PONENTS (Fig. 1-3)
a. Battery Compartment. The batteries are located in
the battery case at the rear of the aiming light. One BA-1567/U or one BA-5567/U can be used in lieu of two BA-3058/U (’‘AA”) batteries if desired. The batteries are easily removed by unscrewing the battery cap.
b. Battery Cap. The battery cap is attached to the body
of the aiming light by a strap to prevent its loss. It protects the batteries from exposure and loss and provides elec-trical contact, when using AA batteries.
c. Scattershield. A scattershield is screwed on the front
of the aiming light, This scattershield reduces off-axis radiation. One scattershieid is provided as part of the aiming light and the second is provided as a spare.
d. Azimuth Adjuster. An azimuth adjuster is located on
the left side of the aiming light, This adjuster moves the tight beam left or right to align it with the weapon barrel.
e. Elevation Adjuster. An elevation adjuster is located
on top of the aiming light, This adjuster moves the light beam up or down to align it with the weapon barrel.
f. ON/OFF Switch. The ON/OFF switch is located on the
bottom of the aiming light. The switch allows power from the batteries to operate the aiming light. The switch has three positions: ON, OFF and momentary ON.
g. Mounting Foot. This weapons adapter foot secures
the aiming light to the mounting bracket.
Figure 1-3. Location of Components and Con-trols.
h. Boresight Aperture. (Fig. 1-4) When boresighting
under very low light levels, the boresight aperture is screwed on the front of both the mounted aiming light and the borelight inplace of the scattershield. One bore-sight aperture is supplied with each system and is kept in the carrying bag.
CEXIII008
Figure 1-4. Boresight Aperture.
i. Mandrel, Boresight M16A1/A2. (Fig. 1-5) This mandrel is used during the process of battlesight zeroing and aligning the aiming light and your weapon. The mandrel is approximately 4.5 inches (11 cm) long and is used with the M16A1/A2 rifle.
Figure 1-5. Mandrel, Boresight, M16A1/A2.
j. Mounting Bracket M16A1/A2. (Fig. 1-6) This bracket
fastens the aiming light securely to the M16 rifle.
CEZIII020 Figure 1-6. Mounting Bracket, M16A1/A2.
k. Carrying Bag. (Fig. 1-7) This bag attaches to your
equipment belt. Space is provided for aiming light, a spare scattershield, two extra batteries, a M16 rifle mounting bracket, and the M16 alignment mandrel. The spare scattershield and boresight aperture are stored in a pocket inside the carrying bag. The alignment mandrel is placed through an elastic loop inside the carrying bag to secure it in a storage position.
Figure 1-7. Carrying Bag.
1. Shipping and Storage Case. (Fig. 1-8) The shipping
and storage case protects the aiming light from damage during transportation, handling, and storage. The case has space for the aiming light, M16A1/A2 mounting bracket, boresight mandrel, boresight aperture, spare scattershield, batteries, carrying bag, lens tissue and operator’s manual.
Figure 1-8. Shipping and Storage Case,
AN/PAQ-4A.
1-8. EQUIPMENT DATA
WEIGHT AND DIMENSIONS
Weight (with battery BA-5567/U). . . ...198 g. Length. . . . . . . 16 cm. (6.3 in,) Width. . . .. . . .. . . . 4.19 cm. (1.65 in.) Height . . . . . . . 5.3 cm. (2.1 in.) PERFORMANCE
Range . . . 150m minimum against a mansized target. Battery Life @ 21 C(70 F) . . . . .. 100 hours operating
(ON) time for BA-5567/U or BA-3058/U batteries. 50 hours operating (ON) time for BA-1567/U bat-tery.
Reliability. . . . . . . .50,000 10 sec. cycles operations before failure.
LIGHT.AIMING.INFRARED.AN/PAQ-4A WARRANTED
NSN 5855-01-312-5160 00083 A3142000 Item
CONTRACT DAABO7-WM2-F101 EXPIRES
MFR 08107 SERIAL NO.
CEX111015
Figure 1-9. Identification Plate.
1-9. WARRANTY
a. The AN/PAQ-4A is warranted by a 3-year conditional manufacturer’s warranty against failure due to design, workmanship, materials or manufacturing defects. This warranty does not protect against damage due to misuse
or mishandling.
b. Failed items which cannot be restored to operational condition, using the procedures contained in this man-ual, should be returned to Sacramento Army Depot, Sac-ramento, CA, for evacuation to the manufacturer. c. The manufacturer will, at his discretion, either repair or replace the item with a new or rebuilt unit. Items being sent to Sacramento Army Depot must be complete with all ancillary items. Batteries should not be shipped with the system.
SECTION III.
PRINCIPLES OF OPERATION
1-10. GENERAL FUNCTIONAL DESCRIPTION
A functional block diagram of the aiming light showing the mechanical, optical, electronic, and control functions is given in figure 1-10.
Figure 1-10. Functional Block Diagram, Aiming
Light AN/PAQ-4A.
1-11. MECHANICAL FUNCTIONS
Aiming light mechanical equipment consists of azimuth and elevation adjusters, a weapon adapter foot, and an ON/OFF switch.
a. The purpose of the azimuth and elevation adjusters is to make fine tune adjustments in order to accurately zero the aiming light to the weapon. These adjustments are comparable to the M16 rifle daysight adjustments. The adjusters move the beam at a rate of just over .25 inches per click at 25 meters.
b. The aiming light mounting foot attaches firmly to the weapon mounting bracket with the fastening screw. The mounting bracket (with aiming light attached) is then mounted to the weapon.
c. The switch lever is used to turn the aiming light ON, OFF, and momentary ON. The momentary ON position is used to activate the aiming light when mounted on the M16A1/A2 rifle by applying thumb pressure to the switch and deactivate the aiming light by releasing the switch. On all other weapons, the switch is used in its ON position.
1-12. OPTICAL FUNCTIONS
The optical components of the aiming light are the re-fractive lens and scattershield.
a. The refractive lens projects the infrared light in a nar-row, well-defined pulsating beam.
b. The scattershield prevents off-axis detection by reduc-ing off-axis radiation from the aimreduc-ing light. For security, the scattershield should always be used when operating the aiming light.
1-13. ELECTRONIC CIRCUIT FUNCTIONS
The aiming light incorporates a LED light source which produces a pulsing infrared beam when the switch is turned to the ON position.
1-14. CONTROL CIRCUIT FUNCTIONS
The control circuit consists of wiring from the electronics circuits, through an ON/OFF switch to the batteries.
CHAPTER 2
OPERATING INSTRUCTIONS
Para 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12Controls and Indicators . . . . Description . . . . Genral Instructions, PMCS . . . . Preventative Maintenance Checks and Services Procedures . . . . Attachment Procedures, M16A1 and
M16A2 Rifle . . . .. . . . Boresight Procedure, M16A1 and
M16A2 Rifle . . . . Attachment Procedures,
M60 Machine Gun., . . . . Boresight Procedure, M60 Machine Gun . . . . Attachment Procedures, M136 (AT4) Launcher and Cartridge . . . . Boresight Procedures, M136 (AT4)
Launcher and Cartridge . . . . Extreme Weather Conditions . . . . Operating Procedures for Unusual
Weather Conditions . . . . Page 2-0 2-1 2-4 2-4 2-9 2-15 2-24 2-28 2-32 2-33 2-35 2-35 2-0 Change 1
Section I.
DESCRIPTION AND USE OF
OPERATOR’S CONTROLS
AND INDICATORS
2.1 CONTROLS AND INDICATORS
You will need to know how to operate the following controls.
Figure 2-1. Controls and Indicators. 2.2 DESCRIPTION
a. Azimuth and Elevation Adjusters. Both adjusters Change 1 2-1
can be turned by gripping the knurled knob between the thumb and forefinger and turning in either direction. During the boresighting confirmation, the adjusters will move the point of impact in the labeled direction at the rate of just over .25 inches per click at 25 meters. To prevent jamming, do not force the adjusters to rotate past their end of travel.
b. ON/OFF Switch. (Fig. 2-2) The ON/OFF switch has three positions ON, OFF and momentary ON. An au-dible click will be heard when switch is turned ON or OFF.
Figure 2-2. Switch Positions for OFF, Momen-tary ON, and ON (bottom view).
NOTE
When the aiming light is mounted on the M16 rifle, it is used in the momentary ON position.
The ON/OFF switch lever is prevented from moving to the full ON position when the lever contacts the rifle handguard. The lever is held against the handguard during operation by pressure from the thumb and the lever returns to the OFF position when released. For other applications, the lever may be pressed to the full ON position where it is held on by the detent.
c. Battery Cap. The battery or batteries are removed by
gripping the battery cap by hand and turning in a
count-erclockwise (CCW) direction. After installing or replacing
battery/batteries as shown in figure 2-3, the battery cap
is reinstalled by turning in a clockwise (CW) direction until
seated finger tight.
Figure 2-3. Installation of Batteries.
Section Il.
PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS)
2-3. GENERAL INSTRUCTIONS, PMCS (TABLE 2-1)
a. Before operational checks. Always keep in mind the CAUTIONS and WARNINGS. Perform your column (B) PMCS checks prior to the equipment leaving its contain-ment area or performing its intended mission.
b. Operation checks. Always keep in mind the
CAU-TIONS and WARNINGS. Perform your column (D) PMCS checks when the equipment is being used in its intended mission.
c. After you operate. Be sure to perform your column
(A) PMCS checks after the equipment has been taken out of its mission mode or returned to its containment area.
2-4. PREVENTIVE MAINTENANCE CHECKS AND SERVICES PROCEDURES
a. Your Preventive Maintenance Checks and Services (Table 2-1) lists the inspections and care of your equip-ment required to keep it in good operation condition. b. Use the Item No. column in your PMCS table to iden-tify and record deficiencies on DA Form 2404 (Equip-ment Inspection and Maintenance Worksheet) when you fill out the form.
c. The Interval column of your PMCS table tells you when to do a certain check or service.
d. The Items To Be Inspected column provides you a listing of the items to be inspected.
a. The Procedures column of you PMCS table tells you
how to do the required checks and services. Carefully follow these instructions.
f. Equipment Is Not Ready/Available If: Column tells
you when and why your equipment cannot be used. g. If your equipment does not perform as required, refer to Chapter 3 undet Troubleshooting for possible prob-lems. Report any malfunctions or failures on Da Form 2404, or refer to DA Pam 738-750.
h. Visually inspect each mounting bracket assembly (or mounting knob) for obvious damage or missing parts. Pay particular attention to stripped threads on the lever screw assembty and missing nuts and washers where applicable. If you are in doubt of the condition of the bracket assembly, or if the sight and bracket assembly cannot be installed as instructed, refer to higher level of maintenance.
and Services.
Operator/Crew Preventive Maintenance Checks
and Services (Cont.)
e 2-1. Operator/Crew Preventive Maintenance Checks
and Services (Cont.)
Operator/Crew Preventive Maintenace Checks
Section III.
OPERATION UNDER USUAL
CONDITIONS
2-5. ATTACHMENT PROCEDURES, M16A1 AND M16A2 RIFLE
a. You must know how to attach the aiming light to the mounting bracket and then attach the bracket (with aim-ing light) to your weapon.
b. Procedure for attaching the aiming light to M16A1/A2 rifle mounting bracket.
CAUTION
Make sure your weapon is clear and on safe before proceeding.
Step 1. Remove the aiming light and M16A1/A2 mounting bracket from the carrying bag.
Step 2. insert batteries into battery compartment (Para. 3-5).
Step 3. Position the aiming light on the mounting bracket
as shown in figure 2-4.
Figure 2-4. Attaching Aiming Light to M16A7/A2 Mounting Bracket.
Step 4. Secure the aiming light to the bracket by turning the fastening screw in a cw direction.
NOTE
Fastening screw must be firmly tightened by hand to secure aiming light to bracket, Do not use tools of any kind to tighten screw as damage to screw or aiming light may occur. Routinely check the tightness of the fasten-ing and thumbscrew durfasten-ing the operation to assure that the aiming light is securely mounted to the rifle,
c. Once the aiming light has been attached to the mount-ing bracket you are ready to attach bracket (with aimmount-ing light) to the M16A1/A2 rifle.
barrel forward.
CAUTION
Make sure your weapon is clear and on safe before proceeding.
Step 1. Place the M16 rifle between your knees with the
Figure 2-5. Attaching Mounting Bracket to M16 Rifle. (Sheet 1 of 3)
Step 2. Insert the M16A1/A2 mounting bracket into the ri-fle handle. Make sure the alignment pin on the bracket is fully retracted and flush with the top surface of the bracket. If it is protruding, turn thumbwheel ccw to retract
Figure 2-5. Attaching Mounting Bracket to M16 Rifle. (Sheet 2 of 3)
Step 3. Adjust the mounting bracket to line up the
align-ment pin with the hole in rifle handle. Turn the thumb-wheel cw to fully engage the alignment pin in the hold of the M16A1/A2 rifle handle. Using thumbwheel continue tightening until the aiming light and bracket are firmly mounted on the rifle.
Figure 2-5. Attaching Mounting Bracket to M16 Rifle. (Sheet 3 of 3)
2-6. BORESIGHT PROCEDURES, M16A1 AND M16A2 RIFLE
a. The following boresight procedure should be per-formed before each mission to assure that the aiming light is accurately zeroed to the M16A1/A2 rifle. If the aim-ing light is beaim-ing remounted on the same weapon to which it has been previously zeroed, skip to paragraph f below to confirm zero.
b. Prepare the 25 Meter Zeroing Target.
Step 1. Mark the designated strike point 3 squares down
and 3 squares to the right of the center of the zero target. (Fig. 2-6)
Step 2. Shade in a 4x4 square region with the
designa-ted strike point in the center as shown in figure 2-6. This region is called the designated strike zone.
Step 3. Attach the 25 meter zeroing target to a flat
sur-face at 25 meters.
c. Follow the mounting procedures in para 2-5 to secure-ly mount the aiming light to the M16A1/A2 rifle. This aim-ing light will be called the “mounted aimaim-ing light” duraim-ing this procedure.
d. Prepare the mounted aiming light and borelight.
NOTE
If a second aiming light is not available, the mounted aiming light can be adjusted to the neutral position (used for the borelight) by following the procedure in para e., Step 1. After setting the neutral position, skip to para f. to confirm zero by firing.
Step 1. Remove a second aiming light, batteries,
bore-sight aperture and a borebore-sighting mandrel from carrying bag. This aiming light will be called a borelight.
Step 2. Insert batteries into the borelight and check for
operation using the Night Vision Goggles in a darkened area.
24 METER ZEROING TARGET M 1 6 A 2
1. ROTATE REAR SIGHT ELEVATION KNOB TO THE 8/3 SSETTING. THEN UP (RIGHT) ONE CLICK PAST THE 300 MARK FOR ZEROING AT 25 METERS.
2. AIM AT TARGET CENTER. ADJUST SIGHTS TO MOVE SHOT GROUP CENTER AS CLOSE AS POSSIBLE TO THE WHITE DOT IN THE CENTER OF THE TARGET,
3. AFTER COMPLETION OF THE 25-METER ZERO. ROTATE THE REAR SIGHT ELEVATION KNOB BACK ONE CLICK TO THE 300/800 METER MARK THE WEAPON WILL BE ZEROED FOR 300 METERS.
C E Z 1 1 1 0 0 4
Figure 2-6. Target for use in Zeroing M16A1/A2
Marked with Designated Strike Point and Designated Strike Zone.
Step 3. Remove scattershield from both the mounted
aiming light and the borelight. Screw on the boresight aperture to the front of both the mounted aiming light and borelight. (Fig. 2-7)
CEZIII010
Figure 2-7. Installation of Boresight Aperture.
Step 4. Screw the boresight mandrel into the battery cap of the borelight until it is fully seated. (Fig. 2-8)
CEZIII019 Figure 2-8. Installation of Bore-sight Mandrel. e. Align the borelight with rifle bore, and then align the aiming light with the borelight.
CAUTION
Make sure your weapon is clear and on SAFE before proceeding.
position (Fig. 2-9)
Step 1. Rotate both the azimuth and elevation adjuster
knobs fully clockwise (CW) to the end of travel. Now rotate each knob back 5 turns counterclockwise (CCW) and align the white dot on each knob with the front flange of the borelight,. The borelight is now in its neutral
Figure 2-9. Adjuster Alignment Markings: Dot
Aligned With Front Flange.
Step 2. Turn the borelight to the fully ON position and
in-sert it in the barrel of the M16A1/A2 rifle. (Fig. 2-10)
CEZIII033 Figure 2-10. Placement of Borelight in M16A7/A2
Rifle Barrel. 2-20
Step 3. While wearing night vision goggles, sandbag or
brace the rifle such that the borelight spot is held steady on the center of the 25 Meter Zeroing Target.
NOTE
If the beam spot is too dim to see with the night vision goggles, remove the boresight aperture from both the mounted aiming light and the borelight.
Step 4. While observing the spot, rotate the borelight in
the barrel of the rifle. If the spot does not move off the black silhouette in the center of the zeroing target, skip to Step 5, If the beam traces a circle larger than the black silhouette on the zeroing target while rotating the bore-light in the barrel, the following adjustments must be made.
● Hold the borelight in the barrel with the mounting
foot in the 12 o’clock position, Rotate the borelight
1
/2 turn to the 6 o’clock position. Observe the
movement of the spot before and after rotating the borelight. Rotate the azimuth and elevation ad-justers in accordance with the following chart:
Movement of Direction of Adjuster
s p o t Rotation Azimuth Elevation Left/Up CW CW Left/Down CW CCW Right/Up CCW CW Right/Down CCW CCW CW = Clockwise CCW = Counterclockwise 2-21
NOTE
● The adjuster knobs move the beam at a rate
of just less than one square (1/4inch) per click at 25 meters.
● The number of adjuster clicks rotated should
correspond to half the total distance the spot moved in each direction when the borelight was rotated 1/2 turn. (from 12 to 6 o’clock).
EXAMPLE: If the spot moves 8 squares (2 inches) to the right and 8 squares (2 inches) down when the borelight mounting foot is rotated from 12 o’clock to 6 o’clock, then the following adjustment should be made:
● Rotate the azimuth adjuster 4 clicks (4 squares)
counterclockwise (CCW).
● Rotate the elevation adjuster 4 clicks (4 squares)
counterclockwise (CCW).
● Repeat Step 4 until the spot no longer moves off
of the black silhouette when the borelight is rotated 1/2 turn.
Step 5. With the rifle mounted or braced so that the
borelight spot is on the center of the target, switch on the mounted aiming light.
NOTE
You should see two equally bright spots on the zero target. If one spot is much brighter than the other, check to make sure that the boresight aperture is on both the mounted aiming light and the borelight.
Step 6. Use the adjuster knobs to adjust the mounted
aiming light spot until it lies at the 10 o’clock and touch-ing position relative to the borelight spot. (Fig. 2-11)
Figure 2-11. Borelight and Mounted Aiming Light Spots.
Step 7. REMOVE THE BORELIGHT FROM THE
BAR-REL OF THE RIFLE.
NOTE
If there are any other aiming lights which need to be boresighted at this time, the same borelight can be used to save time.
CAUTION
You will now confirm zero with live firing f. Confirm zero.
Step 1. From a firing position, switch on the mounted
aiming light and position the spot in the center of the 25 meter zero target.
Step 2. When instructed, fire a 3-round shot group with
the spot directly in the center of the target.
Step 3. When instructed to check the target, walk down
to the target and inspect the shot group fired. If 2 out of 3 rounds are within the designated strike zone, skip to Step 4. If not determine the number of clicks (1 click/ square) required to move the center of the shot group to the designated strike point. Repeat Steps 1 through 3 until two of the three rounds are in the designated strike zone.
Step 4. The aiming light is now zeroed for 100 meters.
Remove the boresight aperture and replace it with the scattershield. The aiming light/M16 rifle is ready for operation.
2-7. ATTACHMENT PROCEDURES, M60 MACHINE GUN
a. The aiming light is attached to the M60 machine gun by first attaching the mounting bracket to the weapon and then attaching the aiming light to the mounting bracket.
b. Procedure for attaching the mounting bracket and aiming light to the M60 machine gun. (Fig. 2-12)
CEZlll028
Figure 2-12. Mounting Bracket Assembly, M60
Step 1. Remove the M60 hinge pin latch and hinge pin
from the cover assembly by pressing on the latch (open end of pin) with an empty cartridge case and separate the latch and pin. Place the pin latch in the aiming guides on the left side of the mounting bracket and press together.
Step 2. Position the mounting bracket assembly on top
of the machine gun cover so that the holes in the front of the bracket align with the cover assembly pin holes. (Fig. 2-13)
Figure 2-13. Mounting Bracket Assembly M60 Attached to Machine Gun M60. Step 3. Insert the longer hinge pin supplied with the
bracket through the bracket and cover assembly and secure by inserting the hinge pin latch.
Step 4. Loosen the wingnuts on both leg clamps and
position the leg clamps under the cover assembly. Se-cure the mounting bracket by tightening the wingnuts firmly.
NOTE
The split washer should be next to the wing nut and the flat washer next to the bracket.
Step 5. Install the aiming light on the M60 mounting bracket assembly by positioning it in the groove on top of the bracket so that the screw hole on the bracket is aligned with the screw hole on the aiming light mounting foot. Tighten the knob screw assembly to secure the aiming light to the bracket. Using the thumb and fore-finger, the knob can be tightened firmly, without the need for tools of any kind.
2-8. BORESIGHT PROCEDURE, M60 MACHINE GUN
a. Prepare the 25 Meter Zeroing Target. (Fig. 2-14)
Step 1. Mark the designated strike point 11.2 cm (4.4
inches) down from the center of the zero target.
Step 2. Shade in a 4 x 4 square region (3.6 cm x 4 cm)
with the designated strike point in the center as shown in figure 2-14. This region is called the designated strike zone.
NOTE
You will notice that the area to be shaded around the designated strike point is off the grid lines of the 25 Meter Zeroing Target. As accurately as possible, you should outline this area on the flat surface under the grid lines of the Zeroing Target.
Step 3. Attach the 25 Meter Zeroing Target to a Type E
silhouette or a flat vertical surface. b. Mount the Aiming Light.
Follow the mounting procedures in para 2-7 to secure[y mount the aiming light to the M60 Machine Gun. This aiming light will be called the “mounted aiming light” during this procedure.
c. Prepare the mounted aiming light and the borelight. Follow paragraph 2-6d, steps 1 thru 4. The M60 boresight mandrel will be used in place of the M16A1/A2 boresight mandrel.
d. Align the borelight with rifle bore, and then align the aiming light with the borelight.
25-METER ZEROING TARGET M16A2
Figure 2-14. Target for use in Zeroing M-60 Ma-chine Gun Marked With Designa-ted Strike Point and Designated Strike Zone.
CAUTION
Make sure your weapon is clear and on safe before proceeding.
Step 1. Follow the M16A1/A2 borelight procedures (para
2-6e. Steps 1-5) to align the borelight with the M60 machine gun barrel. Use the M60 mandrel in place of the M16A1/A2 mandrel to insert the borelight into the barrel of the M60.
Step 2. After aligning the borelight with the M60 barrel,
turn on the mounted aiming light and rotate the mounted aiming light adjuster knobs to superimpose the mounted aiming light beam spot on the borelight beam spot.
Step 3. Rotate the mounted aiming light elevation
ad-juster knob 18 clicks down (counterclockwise) to move the point of impact down to the designated strike point.
Step 4. REMOVE THE BORELIGHT FROM THE BAR-REL OF THE WEAPON.
NOTE
If there are any other aiming lights which re-quire boresighting, the same borelight should be used to save time.
CAUTION
You will now confirm zero with live firing. e. Confirm zero.
Step 1. From a firing position, switch on the mounted
aiming light and position the spot in the center of the 25 meter zero target.
Step 2. When instructed, fire a 3-round shot group with
the spot directly in the center of the target.
Step 3. When instructed to check the target, walk down
to the target and inspect the shot group fired. If 2 out of 3 rounds are within the designated strike zone, skip to Step 4. If not determine the number of clicks (1 click/ square) required to move the center of the shot group to the designated strike point and rotate the aiming light boresight adjuster knobs the required number of clicks. Repeat steps 1 through 3 until two of the three rounds are in the designated strike zone.
Step 4. The aiming light is now zeroed with the M60
Machine Gun for 100 meters Remove the boresight aperture and replace it with the scattershield. The aim-ing light/M60 Machine Gun is ready for operation.
Step 5. The infrared aiming light AN/PAQ-4A can also be
mounted on and zeroed to most other individual and crew served weapons using brackets in Army inventory.
See Appendix D Additional Authorized Items.
2-9. Attachment Procedure, M136(AT4) Launcher and Cartridge
WARNING
● Only M136(AT4) qualified personnel should
install and use the mounting bracket aasembty.
● Conduct all M136 (AT4) operator preventive
maintenance checks and services prior to installation of mounting bracket assembly.
NOTE
All references to the M136 (AT4) Launcher and Cartridge are also applicable to the M287 9 mm Tracer Bullet Training Device.
a. The aiming light is attached to the M136 (AT4) Launcher and Cartridge by first attaching the mounting bracket to the weapon and then attaching the aiming light to the mounting bracket.
b. Procedure for attaching the mounting bracket and aiming light to the M136 (AT4) Launcher and Cartridge. (Fig. 2-14A and 2-14B)
Step 1. Cradle M136 (AT4) in left arm.
Step 2. Position support bracket with mounting rail on
left side and the marking “FRONT’ over the rear sight.
Step 3. With the pivot bracket spread open, place
support bracket against base of the rear sight housing and bottom on the shoulder strap boss.
Step 4. Swing pivot bracket around the M136 (AT4) and
secure by rotating the locking latch clockwise to engage the latch shaft.
Step 5. Lever screw assembly must be located in front
threaded screw hole when mounting the night sight.
Step 6. Place aiming light in groove of the mounting rail
so that the threaded screw hole in the base of the aiming light is aligned with the Iever screw assembly and tighten the lever screw assembly firmly.
Figure 2-14A.
2-24 Change 1
Mounting Bracket Assembly M136 (AT4) Attached to M136 (AT4) Launcher and Cartridge.
Figure 2-14B. Mounting Bracket Assembly M136 (AT4) Attached to M136 (AT4) Launcher and Cartridge.
2-10. Boresight Procedure, M136 (AT4) Launcher and Cartridge
a. Select a stable position for the weapon.
Step 1. Open M136 (AT4) front and rear sight covers. During limited visibility conditions the 7 mm peephole may be necessary for zeroing. Step 2. Set rear sight for 200 meters.
b. Mount the Aiming Light. Verify the mounting procedure in para 2-9. This aiming light will be called the "mounted aiming light" during this procedure.
c. Adjust azimuth and elevations knobs of the mounted aiming light to place the reticle aiming point approxi-mately in the center of the field-of-view of the mounted aiming light.
d. Select suitable target at 200 meters and align weapon to coincide with the aiming point on the target. e. Turn on AN/PAQ-4A.
f. Without moving the weapon, adjust the mounted aiming light so that the 200 meter range marks coincide with the aiming point.
g. Repeat procedures d and f until the mounted aiming light is foresighted to the weapon.
h. Turn off AN/PAQ-4A
Section IV.
OPERATION UNDER
UNUSUAL CONDITIONS
2.11 EXTREME WEATHER CONDITIONS
The use of BA-5567/U battery is recommended for arctic use.
2.12 OPERATING PROCEDURES FOR UNUSUAL WEATHER CONDITIONS.
a. Fog or Frost. Lenses may fog over of frost up during cold rainy weather.
(1) Remove scattershields. (Para 3-6) (2) Clean lens with lens paper. (Para 3-8)
(3) Coat lens with antifogging compound.(Figure2-15) (4) Shake off excess compound and allow lens to dry. (5) Replace scattershield. (Para 3-7)
b. Dusty of Sandy Area.
(1) Do not point the aiming light into the wind. This keeps dust and sand from pitting or scratching the lens. (2) Cover as much of the aiming light as possible to prevent damage to external surfaces or controls.
(3) Keep the textile bag closed except to remove or replace equipment.
Figure 2-15. Application of Antifogging Com-pound.
c. Rainy or Humid Conditions.
(1) Use antifogging compound on the lens (Para 2-10a (3)).
(2) Dry the aiming light thoroughly after exposure to rain or high humidity.
(3) Keep the textile bag closed except to remove or replace equipment.
(4) Do not store the aiming light in a wet or damp carry-ing bag.
d. Salt Water Areas.
(1) After exposure to salt water, clean the aiming light by dipping it into fresh water.
(2) Dry all parts of the aiming light after removing all traces of salt water.
e. Extreme Heat. The aiming light can be operated at high temperatures up to 123°F (51°C).
CHAPTER 3
OPERATOR MAINTENANCE
INSTRUCTIONS
Para 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 Page General. . . . . . . 3-1 Purpose of Troubleshooting. . . . . . . 3-2 Troubleshooting Procedures . . . 3-2Procedures for Removing Batteries . . . 3-5
Procedure for lnstalling Batteries. . . 3-6 Procedure for Removing and Inspecting
Scattershield . . . 3-7 Procedure for Installing Scattershield.. . . . . . 3-8 Procedure for Cleaning Lens . . . 3-9 Procedure for Cleaning Carrying Case 3-10
Section I.
OPERATOR TROUBLESHOOTING
PROCEDURES
3-1. GENERAL
You are required to maintain the aiming light and support equipment in good operational condition. This chapter presents maintenance instructions needed by you to help keep your equipment in good operating order. If these instructions do not restore the aiming light to full operation, return the aiming light to unit maintenance, Unit personnel are required to isolate and correct mal-functions of the scattershield and batteries.
3-2. PURPOSE OF TROUBLESHOOTING a. Purpose. The purpose of troubleshooting is to identify
the most frequent equipment malfunctions, probable causes, and corrective actions required.
b. Functional Check. In a darkened room or outside
dark area, turn the aiming light OFF-ON switch to the ON position. Point the aiming light at a wall approximately 20 meters away and observe the light beam on the target with night vision goggles or equivalent. If the aiming light is operating properly, a sharp, well-defined circular spot of pulsing light will be present. The spot must be pulsing for proper operation. Be sure goggle focus and eyepiece diopter are properly adjusted when performing this check.
3-3. TROUBLESHOOTING PROCEDURES
Information concerning equipment malfunctions and necessary corrective action you take is listed in Table 3-1. The table lists the common malfunctions which you may find during the operation or maintenance of the aiming light and support equipment. You should perform the tests, inspections, and corrective actions in the order listed. This manual cannot list all malfunctions that may occur, nor all tests, inspections, and corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
CAUTION
Operators are not authorized to open the aiming light except to remove and replace batteries, to remove and inspect the scatter shield, and to clean the outer surface of the lens.
Table 3-1. Troubleshooting MALFUNCTION
Test or Inspection Corrective Action
1. INFRARED LIGHT BEAM FAILS TO COME ON
Step 1. Check to see if scatter shield is completely plugged.
Clean scatter shield (para3-6). Step 2. Check Batteries.
Remove and replace (para 3-4 and 3-5). Step 3. Internal Failure.
Report failure to unit maintenance.
Return the aiming light to unit maintenance for replacement.
Table 3-1. Troubleshooting (Cont.)
MALFUNCTION Test or Inspection
Corrective Action
2. INFRARED LIGHT BEAM APPEARS WEAK
Step 1. Check batteries.
Remove and replace (para 3-4 and 3-5). Return the aiming light to unit maintenance for replacement.
Step 2. Check to see if the scatter shield is partially plugged or honeycomb is deformed.
Remove/clean/replace, as required (para 3-6).
Step 3. Check to see if lens is dirty. Clean lens (para 3-7).
Step 4. Check to see if lens is scratched or pitted. Report problem to unit maintenance. Return the aiming light to unit maintenance for replacement.
Section II.
Operator Maintenance Procedures
WARNING
Refer to WARNING notice in front of this manual before removing batteries.
3-4. PROCEDURE FOR REMOVING BATTERIES a. Unscrew battery cap by turning it ccw to gain access to batteries and battery compartment.
b. To remove the BA-3058/U batteries simply tilt the bat-tery compartment down and the batteries will fall out. c. To remove the BA-1567/U battery or the BA-5567/U bat-tery grip edges of batbat-tery with thumb and forefinger and pull.
3-5. PROCEDURE FOR INSTALLING BATTERIES
a. Make certain all contact surfaces are clean. Install either one military type battery, BA-1567/U, or one mili-tary type battery, BA-5567/U, or two BA-3058/U batteries. The BA-3058/U batteries may also be designated AA.
Figure 3-1. Installation of Batteries NOTE
Batteries BA-1587/U and BA-5567/U can be installed only one way with the nipple (nega-tive -) to the left (fig. 3-l). The BA-3058/U (AA) batteries should be installed in accord-ance with the positive (+) and negative (-) marking on the aiming light battery compart-ment and in accordance with figure 3-1. b. Replace battery cap and tighten finger tight.
3-6. PROCEDURE FOR REMOVING AND in-s p e c t i n g
a. Unscrew shield, scatter from aiming light by turning counterclockwise.
b. Inspect for dented or bent honeycomb. If any such damage is found, turn shield, scatter in for replacement. c. Inspect for dust or clogged-up honeycomb. If honey-comb is dusty or clogged, clear and clean with water.
CAUTION
Do not use any mechanical cleaning devices.
NOTE
If honeycomb cannot be cleaned, replace it with the spare and return the damaged scat-tershield to unit support maintenance and get a replacement.
CEZlll026 Figure 3-2. Shield, Scatter Replacement
3-7. PROCEDURE FOR INSTALLING SHIELD, SCATTER.
a. Replace shield, scatter and tighten finger tight.
CAUTION
To avoid cross-threading, insert and turn the shield, scatter counterclockwise a half-turn, then screw it in, turning clockwise.
b. Due to the self-tightening screw thread design in the AN/PAQ-4A, the shield, scatter should not be more than finger tight.
3-8. PROCEDURE FOR CLEANING LENS
a. Remove shield, scatter (para 3-6).
b. Clean lens with lens paper. Lens paper maybe damp-ened with water, (Fig, 3-3)
c. Replace scattershield (para 3-7)
Figure 3-3. Cleaning Lens
3-9. PROCEDURE FOR CLEANING TEXTILE BAG
a. Remove all items from textile bag.
b. Turn upside down to remove loose particles of dirt. c. Wipe clean with a clean, dry, lint-free cloth.
CHAPTER 4
UNIT MAINTENANCE
Para 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 Page Common Tools and Equipment ... . . .. . . .4-1 Repair Parts . . . .. . . .. . . . 4-2 Unpacking . .. . . . . . .. 4-2 Checking Unpacked Equipment. . . 4-3 Repacking . . . 4-3 General instructions Unit PMCS. . . 4-3 Scope Unit Maintenance.. . . . . . . . . 4-6Tests and inspections. . . 4-6 Troubleshooting Procedures . . . 4-7 Removal and Replacement of Parts. . . . . .. . . . . . 4-10
Section l.
REPAIR PARTS, SPECIAL TOOLS,
TEST, MEASUREMENT AND
DIAGNOSTIC EQUIPMENT (TMDE),
AND SUPPORT EQUIPMENT
4-1. COMMON TOOLS AND EQUIPMENT
There are no tools or equipment required for unit main-tenance personnel for servicing the AN/PAQ-4A.
4-2. REPAIR PARTS
Repair parts are listed and illustrated in Appendix F, Repair Parts and Special Tools List. Maintenance pro-cedures are provided in Sections III and II.
Section II.
SERVICE UPON RECEIPT
4-3. UNPACKING
CAUTION
Carefully open shipping container. Do not puncture as damage to shipping and storage case may result.
Unpack the AN/PAQ-4A from the shipping container as follows:
a. Carefully open shipping container cushioning mater-ial.
b. Remove shipping and storage case containing the AN/PAQ-4A.
c. Save cardboard boxes and cushioning material for temporary storage or return shipments.
4-4. CHECKING UNPACKED EQUIPMENT
When checking unpacked equipment, the following tasks should be performed:
a. Inspect the equipment for damage incurred during shipment. If the equipment has been damaged, report the damage on SF 364, Report of Discrepancy (ROD).
b. Check the equipment against the packing slip to see if the shipment is complete. See Appendix C and D. Report all discrepancies in accordance with the instruc-tions of DA PAM 738-750.
4-5. REPACKING
When packed for shipment, the shippping and storage case containing the AN/PAQ-4A is wrapped with cushioning material and placed in a close fitting card-board box. Finally, the cardcard-board box is packed in a tri-ple wall shipping box and metal banded.
Section III.
UNIT PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS)
4-6. GENERAL INSTRUCTIONS UNIT PMCS
PMCS is the systematic care, inspection, and servicing of equipment to maintain it in serviceable condition, pre-vent breakdowns, and assure maximum operational
capability. Unit preventive maintenance checks and ser-vices (PMCS) are performed quarterly (Table 4-1). If your equipment fails cooperate, notify the next higher level of maintenance.
a. Quarterly PMCS will be scheduled in accordance with procedures specified in DA PAM 738-750.
b. The Item No. column in Table 4-1 shall be used as a source of item numbers for the TM number column on DA Form 2404 (Equipment Inspection and Maintenance Worksheet) in recording the results of the PMCS. c. The Item to be Inspected column lists the items to be inspected.
d. if the equipment fails to meet the criteria in the Pro-cedure column in Table 4-1, report the failure in accor-dance with the procedures specified in DA PAM 738-750, e. If the equipment must be kept in constant operation, check and service only those items that can be done without disturbing operation, Perform all checks and ser-vices when the equipment can be shut down.
f. Some of the routine checks that may not be listed in the PMCS table are: cleaning, checking gasket, stowing items not in use, and checking for loose or missing parts. These checks should be done whenever needed.
Schedule
Checks and Services Quarterly
Table 4-1. Unit Preventive Maintenance
Section IV.
UNIT MAINTENANCE PROCEDURES
4-7. SCOPE — UNIT MAINTENANCE
Unit maintenance consists of operational tests, inspec-tions, troubleshooting, and the replacement of a limited number of parts. This category of maintenance does not require special test equipment or complex procedures. Authorized unit support maintenance is listed in the maintenance allocation chart (MAC), Appendix B. Aim-ing light failAim-ing to meet operational tests and inspections should be replaced. Failed units should be sent to depot as noted in paragraph 1-9.
4-8. TESTS AND INSPECTIONS
a. Visual/mechanical inspection. Observe the unit for obviious mechanical damage such as deformed mount-ing brakcet, inoperative switch, scratched lens, broken or jammed azimuth or elevation adjusters, parted battery cap strap, and other evidence of damage or misuse which might indicate a need for repair. Replace as re-quired (Para. 4-7). Conduct checkout of replacement and check proper operation of the aiming light. If operable, return to service. If not operable, continue trouble-shooting (Table 4-2).
b. Functional Test. Conduct a functional test using a dark room or area away from the light. Use Night Vision Goggles AV/PVS-5 or AN/PVS-7 and observe the light spot. For proper operation, a sharp, well-defined circular spot of pulsing light should appear. The pulsing spot should be approximately 6.5 centimeters (2.5 inches) in diameter when projected on a wall at 25 meters. The aim-ing light must emit a pulsaim-ing light beam to operate pro-perly. Check the operation of the azimuth and elevation adjusters as well (Para. 2–2a).
4-9. TROUBLESHOOTING PROCEDURES
Information concerning equipment malfunctions and necessary corrective action you take are listed in tables 3-1 and 4-2. The table lists the common malfunctions which you may find during the operation or maintenance of the aiming light and support equipment. You should perform the tests, inspections, and corrective actions in the order listed. This manual cannot list all malfunctions that may occur, nor all tests, inspections, and corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
Table 4-2. Unit Troubleshooting
MALFUNCTION
Test or Inspection Corrective Action
1. INFRARED LIGHT BEAM FAILS TO COME ON
Step 1. Check for missing or improperly installed batteries, Check for dead battery.
Replace batteries.
Step 2. Check for clogged scattershield. Clean or replace as necesary Step 3. ON-OFF switch does not function.
Return aiming light to depot for replacement.
2. INFRARED LIGHT BEAM APPEARS WEAK
Step 1. Check batteries.
Remove and replace (para 3-4 and 3-5). Step 2. Inspect scattershield for dirt.
Clean and/or replace if damaged. Step 3. Inspect lens for dirt or cracks.
Clean lens with lens paper.
Lens cracked, return AN/PAQ-4A to depot for replacement.
Table 4-2. Unit Troubleshooting (Cont.)
MALFUNCTION Test or Inspection
Corrective Action
3. AZIMUTH AND ELEVATION ADJUSTER INOPERATIVE.
Check operation of adjusters as described in paragraph 2-2a.
Adjusters can not be repaired or replaced. Return AN/PAQ-4A to depot for replacement.
4-10. REMOVAL AND REPLACEMENT OF PARTS
Unit maintenance includes removal and replacement of assemblies.
a. Scatterehield Removal and Replacement. See
paragraph 3-6 for procedures.
b. Battery Removal and Replacement. See paragraph
3-4 and 3-5 for procedures.
WARNING
The military batteries used contain either mercury (BA-1567/U) or lithium (BA-5567/U), and should be handled in the following man-ner,
1. Do not dispose in fire. 2. Do not short circuit.
3. Return batteries to PDO for disposal in ac-cordance with DLSC Handbook 41601.
c. Removal of Battery Cap. (Fig. 4-1)
(1) Unscrew battery cap from back of aiming light. (2) Stretch retaining strap over groove in battery cap and remove.
Figure 4-1. Exploded View AN/PAQ-4A d. Removal of Battery Retaining Strap (Fig. 4-1).
(1) Remove screw and washer attaching retaining strap to aiming light.
(2) Stretch retaining strap over groove in battery cap and remove.
e. Replacement of Battery Retaining Strap.
(1) Place retaining strap with large diameter hole over groove in battery cap. Pull and stretch strap to fit com-pletely in groove.
(2) Attach other end of retaining strap to aiming light using screw and washer.
f. Aiming Light. The aiming light shell contains the
elec-tronic, mechanical, optical and control functions and is not repairable. See paragraph 1-9 warranty instructions for replacement, Aiming light components are replaced as required and are listed in Appendix F, Repair Parts and Special Tools List.
APPENDIX A
REFERENCES
A-1. Scope
This appendix lists all forms, technical manuals and mis-cellenaeous publications referenced in this manual.
A-2. Forum
SF 361 Transportation Discrepancy Report
(TDR)
SF 364 Report of Discrepancy (ROD)
SF 368 Product Quality Deficiency Report
A-3. Technical Manuals
TM 11-5855-213-23P TM 11-5855-238-10 TM 11-5855 261-10 TM 11-5855-261-23
Organizational and Direct Support Maintenance Repair Parts and Special Tools List for Night Vision Sight indivi-dual Served Weapon AN/PVS-4. Operator’s Manual for Night Vision Gog-gles AN/PVS-5 and AN/PVS-5A. Operator’s Manual, Aiming Light, in-frared AN/PAQ-4.
Organizational and Direct Support Maintenance Manual, Aiming Light, in-frared AN/PAQ-4.
TM 11-5855 262-10-1 TM 11-5855 262-10-2 TM 750-244-2
Operator’s Manual for Night Vision Gog-gles AN/PVS-7A.
Operator’s Manual for Night Vision Gog-gles AN/PVS-7B.
Procedures for Destruction of Elec-tronics Materiel to Prevent Enemy Use (Electronics Command)
A-4. Miscellaneous Publications
DA PAM 25-30 Consolidated Index of Army Publica-tions and Black Forms.
DA PAM 738- The Army Maintenance Management
750 System (TAMMS)
APPENDIX B
MAINTENANCE ALLOCATION
Section I.
Introduction
B-1. General
This appendix provides a summary of the maintenance operations for the AN/PAQ-4A. It authorizes levels of maintenance for specific maintenance functions on re-pairable items and components and the tools and equip-ment required to perform each function. This appendix may be used as an aid in planning maintenance opera-tions.
B-2. Maintenance Function
Maintenance functions will be limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical characteristics with established standards through examination.
b. Test. To verify serviceability and to detect incipient failure by measuring the mechanical or electrical char-acteristics of an item and comparing those character-istics with prescribed standards.
c. Service. Operations required periodically to keep an
item in proper operating condition, i.e., to clean (decon-taminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air sup-plies.
d. Adjust. To maintain, within prescribed limits, by
bring-ing into proper or exact position, or by settbring-ing the oper-ating characteristics to the specified parameters.
e. Align. To adjust specified variable elements of an item
to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be
made or to be adjusted on instruments or test measuring and diagnostic equipments used in precision measure-ment. Consists of comparisons of two instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or fixing into
position an item, part, module (component or assembly) in a manner to allow the proper functioning of the equip-ment or system.
h. Replace. The act of substituting a serviceable like
type part, subassembly, or module (component or as-sembly) for an unserviceable counterpart.
