AND SUBASSEMBLIES; TEST EQUIPMENT;
AND THE TRAINER LP/C
Task. This lesson is based on the following task from STP 9-27B14-SM-TG: 093-436-4086, Direct Support Maintenance on the Multiple Launch Rocket System (MLRS) and Associated Test Equipment.
Objective. When you have completed this lesson, you should be able to describe the operation of the FCS and MLRS assemblies, subassemblies, trainer LP/C, and ancillary equipment.
Conditions. You will have this subcourse book and work without supervision.
Standard. You must score at least 70 on the end-of-subcourse examination that covers this lesson and lessons 1, 3, 4, 5, 6, and 7.
FIRE CONTROL SYSTEM MENUS
You need to know the detailed operation of the system's menus because you and your repairers use them for calibration, repair, and verification of repair. Running these menus is the only self-test the system has.
Firing Menus
Starting Up. Ensure that communication equipment and arm and fire switches are off. Set master power switch on. Set launcher interconnect switch on. Turn on fire control panel system power. When ensure language prompt appears on the display screen, select appropriate language prompt, and press execute.
Inputting Start-Up Data. The next prompt that will appear after execute is pressed will be the index menu.
From this menu, select option zero (0), which is the start-up data menu. The start-up data selection field is displayed. Select the system start up, option number zero (0), and press store.
The first field in the system start-up routine is the easting field (part of determining position). The location coordinates entered for this field are the present location of the SPLL at the time of start up. Enter the easting numbers written on your SPLL start-up data card (figure 2-1) and press store.
The northing, altitude and grid zone are all inputted the way the easting was. Once all the inputs are stored, the next prompts will appear. They are giving you the status of the rocket.
The last field requires time input. Once this is complete, the next prompt tells you the SRP is aligning and how long it will take. The displayed time counts down until the SRP is aligned. The maximum time you can have is 8 minutes.
During SRP alignment, press index and select start up data. When the start up data menu appears, select the communications start up option, which is 1, and press store. Once store has been pressed, the prompt on the display screen changes.
There are 32 fields in the communications start up. The only fields used are fields 1 through 25. All information to be inputted is taken off of the MLRS SPLL start-up data card. For each field, enter the appropriate number and press store. All fields are entered in the same manner. Upon completion of the communications start up, the next prompt will be either SRP aligning--time-to-go or SRP ready.
Inputting PDS Data. In order to gain access to the PDS, start up from the last prompt with the index key. This displays the index menu again. Select start up data, option zero (0). On the new display, notice that PDS start up is option 2. Press number 2 and store keys.
The first field to be seen is the odometer scale factor. The numbers for input are found on the MLRS SPLL start-up data card. Entries for azimuth crab angle and elevation crab angle are inputted the same.
Inputting Fire Mission Data. Press the index key for the index menu to be displayed. From the index menu, select the auxiliary menu, option number 8. Press execute. The auxiliary menu will be displayed, and, from it, select the fire-mission routine, option number 4. Press execute key. The first field in the fire mission routine will be displayed. The target number is for editing only. There is no input for this field. To get the next prompt, press next field. (This also pertains to move easting, move northing, and move grid zone.) Once next field is pressed, the first prompt seen is warhead. All
information needed for input of fire mission data is obtained from the SPLL tactical fire mission data card (figure 2-2). Each field is self explanatory and all information is inputted the same way.
Following Firing Sequence. The entries for manual fire mission have now all been inputted, and the first prompt in the fire mission routine is displayed.
Press initiate when the crew has parked the vehicle at the appropriate heading. The next prompt appears at the same time the fire control system calculates all fire mission data.
When LCHR LAY (launcher lay) is pressed, the fire control system recalculates fire mission data, then unlocks the travel locks. The LLM elevates to 302 mils, then traverses left or right to the first firing point. When movement stops in azimuth, the LLM elevates or depresses to the first firing point. When the degrees of both azimuth and elevation are correct, after a few seconds, the display adds one line, arm rockets. The operator flips the toggle that arms the rocket. The system sets the fuze of the rocket, and the display adds another line, fire rockets. The operator now flips the toggle switch that fires the rocket.
Closing Down. When the fire mission is complete, the next prompt tells the crew to stow LLM. When LLM stow is pressed, the LLM starts to move to the stow position. When the LLM is stowed, the LLM stowed prompt appears. The fire mission is complete, and the crew moves the system to the reload area.
Administrative and Maintenance Menus
Index. The index menu initially has five menus that are functional when power is first applied. After SRP has aligned, the index menu increases its memory to 10 functional menus (adds five).
Boom Control. With the boom control menu the crew tells the SPLL how to adjust itself for reload or repairs. It
Rocket Status. When this menu is called up, it shows the status of all rockets.
D = Dud = Good
Blank Space = Fired H = Hangfire
Update PDS. This menu is called up when the PDS is to be updated or calibrated by the crew
Auxiliary. The auxiliary menu lists additional operating routines for normal SPLL operation.
HYDRAULIC AND MECHANICAL ASSEMBLIES OF THE LLM