PT6A-20 Maintenance Manual

(1)

ATP

INDEX

COPYRIGHT 2006

COPYRIGHT IS NOT CLAIMED AS TO ANY PART OF AN ORIGINAL WORK

PREPARED BY A UNITED STATES GOVERNMENT OFFICER OR EMPLOYEE AS

PART OF THAT PERSONS OFFICIAL DUTIES OR BY ANY OTHER THIRD PARTY

OFFICER OR EMPLOYEE AS PART OF THAT PERSONS DUTIES.

"ATP" is a registered trademark of Aircraft Technical Publishers. All original

authorship of ATP is protected under U.S. and foreign copyrights and is subject

to written license agreements between ATP and its Subscribers.

ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY BE

REPRODUCED, STORED IN A RETRIEVAL SYSTEM, OR TRANSMITTED IN ANY

FORM BY ANY MEANS, ELECTRONIC, MECHANICAL, PHOTOCOPYING,

(2)

Aircraft Technical

Publishers

Customer Service

101

South

Hill Drive 6AM-5PM PST M-F

Brisbane.

CA

94005

(800)227-4610

ATP

Grid Index

to

Manufacturer’s Publications:

Prat

_Whitney

Canada

PT6A-6

PT6A-20 Series

_Engines

Maintendnce

Manual

Section

Topic

General

Information

Title

_Page

List

of

_Chapters

(Table

of

Contents)

Record of Revisions

Record

of

_Temporary

Revisions

Letter

of Transmittal

(Highlights

of

_Changes)

List of Effective

_Pages

Service Bulletin

List

Airworthiness

Limitations

Part 1

_Description

of

_Engine

Introduction

Leading

Particulars and

_{Specifications}

General

Information

Detailed Information

Air

_Systems

Lubrication

_System

Ignition System

Glow

_Plug

_Type

(Pre-SB1429)

Spark

Igniter Type

(Post-SB1429)

Fuel

_System

Introduction

Fuel

_Pump

(Vane

Type)

Fuel

_Pump

(Gear

Type)

Fuel

Control

_System

Fuel Control Unit

(3)

Fuel

Control

_System

_{Complete Operation (Typical)}

Fuel

_Dump

Valve

Fuel Manifold and

_Spray

Nozzles

Engine

Controls and

Instrumentation

Propeller

Non-Reversing

Inst

(PT6A-6

Engines)

Propeller

Reversing

Inst

(PT6A-6A

Engines)

Propeller

Reversing

Inst

(PT6A-6B

PT6A-20

_Engines)

Propeller

Reversing

Inst

(PT6A-20A

PT6A-20B

_Engines)

Part 2

General

Procedures

Engine

Oil

System Servicing

Preparation

for

Service or

Storage

Introduction

Removal /Installation

Engine

Preservation/Depreservation

Cleaning

Introduction

Specific

Parts

Field

_Cleaning

Internal Washes

Fuel Nozzle

Cleaning

Engine

External Wash

Standard

Practices

Metal

Particles-Identification

Marking

of

Parts

Temporary Marking

Methods

Welding

Standard

_Inspection

Procedure

Elbow

Fittings

Touch-Up

Solution

Torque

Recommendations

Testing

Introduction

Ground

Safety

Precautions

Test Information

Extreme Weather Conditions

Ground

_Testing

Checks After

_Component

_{Repair-Replacement}

Idle

_Speed

_Adjustments

(4)

Section

Topic

Engine

Final Checkout

Troubleshooting

Consumable Materials

Part 3 Line Maintenance

Special

Tools

Removal

and Installation

Propeller

Shaft Oil

Seal

Power

Section

T5

_Thermocouple

Harness

and Post-SB1246

T5

_{Thermocouple.}

Harness.

Bus-Bar

Probes

Post-SB1246

Compressor

Turbine Disk

Turbine Inlet

T4

_Thermocouple

Harness‘

T4 Trim Harness

(PT6A-Series

Engines,

Post-SB1198)

Glow

_Plugs

and Cables

(Pre-SB1429)

Spark

Igniters

and

_Igniter

Cables

(Post-SB 1429)

Gas Generator

Case

Drain

Valves

Combustion Chamber

Liner

Power Turbine Governor

and

NF

Tachometer-Generator

Propeller

Governor

(PT6A-20A

and’-20B

_Engines)

Air

Inlet

Screen

Inlet

_Fairing

Winterized

Heat

Shield

Compressor

Bleed Valve

Fuel

Control

Unit

Fuel

_Pump

Fuel

_Pump

Outlet Filter

_{(Vane-Type~Pump)(Pre-SB1071}

_Eng)

Fuel

_Pump

Init

Scrn

_{(Vane-Type Pump)(Pst-SB1071,-SB1112)}

Fuel

_Pmp

Init Scrn

(Gear

Pump

)(Post-SB1096, Pre-SB1155)

Fuel

_PmpOutlt

Filter

(Gear

_{Pump)(Pst-SB1155}

PT6A-20A)

Fuel

_Pmp

Init

Scrn

(Gear

_{Pump)(Post-SB1155}

PT6A-20A)

Temperature Compensator

Pneumatic

Control

Line

(P3)

and P3

Air

Filter

Oil

Filter

Oil´• Filter

_Housing

(Post-SB1247)

Oil

Flter Check

_Bypass

Valve

_Assy

(Post-SB1247)

Oil

Pressure

Relief Valve

Ignition

System

Ballast Tubes

(Pre-SB1429)

Ignition

Current

_Regulator

(Pre-SB1429)

Ignition

Exciter

(Post-SB1429)

(5)

Inspection

Control

_Linkage

Corrosion

Tubing

and’Hose Assemblies

Accessories

In-Service

_Inspection

Hot

Section

_Inspection

Propeller

Shaft Oil Seal

Combustion Chamber Liner

Compressor

Turbine

Blade

_Tip

Clearance

Compressor

and

Power

Turbine Blades

Compresses

and

Power Turbine Vanes

Compressor

Blades

(First

Stage)

Compressor

Turbine

Vanes

Turbine Inlet-T4

_Thermocouple

Harness

T5

_Thermocouple

Harhess.

Probes and

_Bus-Bay

Compressor

Trbn

Shroud

_Housing

_Intrstg

_Sealing

_Rings

Glow

Plugs

(Pre-SB1429)-Spark

Igniters

and

_Spark

Ignition System

(Post-SB1429)

Fuel Manifold

_Adapter

Assemblies

Oil

Filter Element

_{(Post-SB1038.}

Post-SB1118

PT6A-20A)

Chip

Dectector

Fuel

_Pmp

Init Screen Otlt Fltr

(Pst

SBi155

PT6A-20A)

Plclvance

Revision

No. 67

Engine

Unscheduled

_Inspection

Part 4

Heavy

Maintenance

Special

Tools

Removal

and Installation

Introduction

Engine

Stands

Power

Turbine

Vanes

(Pre-SB1OG1

Post-SB1246)

Power

Turbin

Vane

_Ring

PT6A-20

(Post-SB1OG1- SB1246)

Compressor

Turbine Vanes

a~nd

Shroud

Segments

Large

Exit Duct

Starter-Gen Gearshaft

_Cntrfgl

Breather Carbon Seal

Scavenge

Pump

Inlet

Screen

Inspection

Repair

(6)

Section

Topic

Introduction

Helical

Coil

Inserts

Reduction Gearbox

Assembly

Combustion Chamber

Liner

Exhaust

Duct

_Turning

Vane

(Pre-SB1151

Engines)

Exhaust

Duct

(Pre-SB1151

Engines)

Compressor

Inlet Case

Gas Generator Case

Compressor

Turbine Shroud

_Grinding

Accessory

Gearbox

_Assembly

T5 Bus-Bar Terminal

_Straps

or

Lugs

T5

Terminal

Block

T5

_Termocouple

Harness

Fireseals

Inlet

_Fairing

and

_Support

_Ring

Insulated and Heated

Pneumatic

Tubes

Oil

Filter

Check Valve

Ignition

Current

_Regulator

Box

Special

Limits

and

_Torque

Recommendations

Reduction Gearbox

PT6A-6A

_Engines

Reduction Gearbox

Pre-SB1124

PT6A-6,-6B

and

20

_Engines

Reduction Gearbox

Post-SB1124 PT6A-20

and PT6A-20A

_Eng

Post-SB1046 PT6A-20

_Eng,

Post-SB1043/1046 PT6A-20A’

Eng

Pre/PostlSB1043 and Post-SB1046

PT6A-6 and PT6A-6B

_Eng

eropeller

Reversing Linkage

PT6A-6A

Engines

Reversing

Linkage

T.

PT6A-6B

and

PT6A-20

Engines

Reversing

Linkage

PT6A-20A

_Engines

Accessory

Gearbox

(All

Eengines)’

(7)

NI

_FG,

(8)

IMAINTENANCE IWANUAL

TURBOPROP GAS

TU RBINE

ENGIN

E

Nlodel(s)

PT6A-6

SERIES

AND -20

SERIES ENGINES

Manual Part No. 3015442

Issued

4 _July

1973

The contentsof this manual have been examined and found

_acceptable

tothe Minister in

_meeting

the

_requirements

ofan

Engine

Maintenance Manualforthe Pratt

Whitney

Canada PT6-6 Series and PT6A-20 Series

_engine

models,

as

required by

the

Canadian Airworthiness

Manual,

Chapter

533.4 "lnstructions for Continued Airworthiness".

PRATT

WHITN’EY

CANADA

(9)

PROPRIETARY NOTICE

This

document

contains

matter

of

_proprietary

nature and is

delivered

on the

_{express condition that it is}

not to

be

disclosed

or

reproduced

in whole or in

_part

without

the

written

consent

of

Pratt

_Whitney

Canada

_Corp.

This

restriction does not limit the

_right

to disclose

information

obtained

from other sources.

(10)

RECORD

OF

REVISIONS

MFG REV

NO DESCRIPTION ISSUEDATE ATPREVDATE INSERTEDBY

20 See

Highlights

2112/99 4119/99 ATPIKS

CorrectiontoRevisionNo.20 2112/99 10115101 ATPIMT

21

(See Highlights

211/02 5/29102 ATPIMG

22 See

Highlights

8/16102 10/30/02 ATPIRCL

23 See

Highlights

6/6/03 10/1/03 ATP/HW

24 See

_Highlights

4/2/04 6/17/04 ATPIMG

25 See

_Highlights

8/27/04 11/18/04 ATP/JSF

26 See

_Highlights

11/26/04 2/18/05 ATP/MB

27 See

_Highlights

6/1 0/05 7/22/05 ATP/VDR

(11)

RECORD OF REVISIONS

REV ISSUE DATE REV ISSUE DATE

BY BY

NO. DATE INSERTED NO. DATE INSERTED

1 Nov 15/73 P&WC 2 1 Jun 02/75 P&WC 3´• Oct 04/76 P&WC 4

_May

09/77 P&WC 5 1 Mar 15/78 P&WC 6 1 Jun 12/79 P&WC 7 1 Feb 01/80 P&WC 8

_Sep

18/81 P&WC 9 Feb 14/83 P&WC 10 Oct 08/85 P&WC 11

_{I Sep}

30/86 P&WC 12

_{1 Apr}

11/88 P&WC 13 Jun 01/89 P&WC 14

May

01/91 P&WC 15 Jun 01/91 P&WC 16

May

15/92 P&WC 17

_May

15/93 P&WC 18 Nov 15/93 P&WC 19 Feb 27/98 P&WC

20 Feb 12/99 _Feb

_12/99

P&WC 21 1 Feb 01/2002

~r

01/02

P&WC

NUS 2

~f

r230

Oa;l

~un 4/03 Oct 1/03 ATP/HW

24 Ar>r 2/04 Tun !?/04 ATP/MG 25

₁

_{~ug 27/1)4} _Oct

ATP/JSF

2r, Nov-26/04 F25 1.8/05 ATP!MB

2?

_JLn~

_~0/05 Jul. 22/05 h~3R 28 n-e 2/05 ~ar 8/n6 /~SP

(12)

RECORD OF TEMPORARY REVISIONS

TEMP ATP REV INSERT DATE REV REMOVE

REVNO DESCRIPTION ISSUEDATE DATE BY REMOVED INCOR BY 64 Part2-Sec2:2-16 1/24/03 4/16/03 ATP/MG 10/1/03 23 ATP/HW

65 Part3-Sec2:2-64

66 Part3-Sec2:2-66

(13)

RECORD OFADVANCE REVISIONS

TR. PAGE ISSUE INSERTED DATE REMOVED

NO. CH/SE/SU NO. DATE BY REMOVED BY

h;2

i;l>art 2 2-]. 6

1/24/03

ATP/MG 10/?/03 ATP/HW 45 Part 3 2-64

66 Part 3 2-66

(14)

Pratt WhitneyCanada_Corp.

Pratt

_1Whitney

Canada

1000,Marie-Victorin

Longueuil,QuBbec,Canada J4G1Al

AUnitedTechnologies Company

TBI. 450-677-9411

January

5,

2006

REVISION

TRANSMITTAL

SHEET

TO: Holders of the Pratt

_Whitney

Canada Maintenance Manual for

PT6A-6/-6A/-6B/-20/-20A/-20B

Engines,

Manual Part No. 3015442.

SUBJECT: Revision No.

_28,

dated Dec 02/2005

Please insert the attached Revision No. 28_pages into _{your copy} of the PT6A-6/-6A/-6B/-20/-20A/-20B

Maintenance Manual. Remove and

_{destroy superseded}

_pages.

Revised data may be in the form ofa full

page-block replacement (replacing

an entire

page-block);

or, a

partial page-block replacement (replacing only

the affected _pages within

the

_page-block).

that _you do not

_{inadvertently}

_{discard pages} thatshould be

retained,

the manual should

beIt

is most

_important

that extreme care be exercised in

updating

your copy of the manual. To ensure

updated

in accordance with the Lists of Effective

_Pages.

Pages supplied

with the new date but no visible

change

_{may contain}

coding changes

_transparent

to

the user and should be inserted as

_part

of the revision.

Please add Revision No. 28 to the Record of Revisions.

Any discrepancies, problems

or

suggestions regarding

this revision should be forwarded in

writing

using

the Pratt

_Whitney

Canada Customer Feedback Sheet

_(RSVP),

and directed to: Pratt

_Whitney

Canada

_Corp.

1000 Marie-Victorin

Longueuil,

Quebec Canada J4G 1Al

Attention:

_Manager,

Technical Publications

(01PB4)

Email:

_publications

_pwc.ca

Fax:

₍₄₅₀₎

647-2702

Customer Feedback Sheets are contained with new manuals and each

subsequent

revision. You

may also submityourfeedback via our on-line RSVP form available at: www._{pwc .ca/e}

n/3_0/3_0_6/3_0_6_5_7

.asp.

(15)

REVISION NO. 28 HIGHLIGHTS

Location

Description

of

_Change

Part 2 OIL LEVEL CHECK Section 1

Deleted CAUTION.

_Engine

oil

_top

_up allowed

_(Ref.

SB1001R24).

Part 3 INTRODUCTION Section 3

Deleted CAUTION in Oil

_{System. Engine}

oil

_top

_up allowed

(16)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL

MANUAL PART NO. 3015442

LIST OF EFFECTIVE PAGES

PART

SECTION FAG E DATE

Title

_Page

Jun 01/89

Record of Revisions Jul 04/73

Record of Advance Revisions Jul 04/73

LEP 1 Jun 10/2005 2 blank Jun 10/2005

Part/Section 1 Feb 01/2002

List 2 Feb 01/2002

Advance 1 Jun 06/2003

Revision 2 blank Jun 06/2003 Index Service 1

Apr

02/2004 Bulletin 2

_Apr

02/2004 List 3

_Apr

02/2004 4

_Apr

02/2004 5

_Apr

02/2004 6

Apr

02/2004

(17)

PART/SECTION LIST

PART/SECTION TITLE

AIRWORTHINESS LIMITATIONS Ain~vorthiness Limitations

1 GENERAL INFORMATION AND DESCRIPTION

1-1 Introduction

1-2

_Leading

Particulars and

_{Specifications}

1-3 General Information 1-4 Detailed Information 1-5 Air

_Systems

1-6 Lubrication

_System

1-7

_{Ignition System}

1-8 Fuel

_System

1-9

Engine

Controls and Instrumentation

1-10

Propeller Non-reversing

Installation

_{(PT6A-6 Engines)}

1-11

Propeller

Non-reversing

Installation

(PT6A-6A

Engines)

1-12

Propeller

Non-reversing

Installation

(PT6A-6B

and PT6A-20

_Engines)

1-13

_{Propeller Non-reversing}

Installation

_(PT6A-20A

and -20B

Engines)

2 GENERAL PROCEDURES

2-1

_Engine

Oil

_{System Servicing}

2-2

_Preparation

for Service or

Storage

2-3

Cleaning

2-4 Standard Practices 2-5

_Torque

Recommendations 2-6

_Testing

2-7

_{Troubleshooting}

2-8 Consumable Materials

(18)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL MANUAL PART NO. 3015442

PART/SECTION TITLE

3 LINE MAINTENANCE

3-1

Special

Tools

3-2 Removal and Installation

3-3

Inspection

4 HEAVYMAINTENANCE

4-1

_Special

Tools

4-2 Removal and Installation

4-3

_Inspection

4-4

_Repair

(19)

SERVICE BULLETIN LIST

This list identifies all Service Bulletins

_(SB’s)

for the PT6A-6 Series and PT6A-20 Series

_engine

models. Bulletins considered to have no effect on manual have the words "No Effect"

added;

effective bulletins

_give

the date

_incorporated

in the manual.

The

_{incorporation}

of Service Bulletins on the

engine

is recorded in the

engine log

book and

_early

PT6A-6 and PT6A-20 Series

(Engine

Model

_{Group #01) engine}

ATA 72-Series Service Bulletins are

prefixed

with Part No. 3026521 in lieu of a

specific

model identifier. New and

recently

revised SBs have the

_prefix

PTGA.

For a current set of PT6A-6 Series

_engine

Service Bulletins

_only,

use

ordering

number 3020771.

For a current set of PT6A-20 Series

_engine

Service Bulletins

_only,

use

ordering

number

3020772.

NOTE: The noted Service Bulletins are

being continually

revised to reflect P&WC

recommendations for

oil, fuels,

engine planned

maintenance,

etc.,

and are concurrent with

_{incorporation}

of

_engine

modifications.

P&WC ATA Effect/Date

SE No. SE No. Rev. No.

_Engine

Model

_{Applicability}

_Incorporated

1001 72-1001 23 PT6A-6/-6A/-6B/-20/-20A/-20B See NOTE

´•I

1003 72-1003 28 PT6A-6/-6A/-6B See NOTE

1002 72-1002 23 PT6A-6/-6A/-68/-20/-20A/-20B See NOTE

1024 72-1024 1 Feb 01/80 1038 72-1 038

_Orig.

Jul 04/73 1040 72-1 040

Orig.

Nov 15/73 1043 72-1 043

_Orig.

Jul 04/73 1045 72-1 045

Orig.

Jul 04/73 1046 72-1 046

Orig.

Jul 04/73 1047 72-1 047

_Orig.

Nov 15/73 1056 72-1056 2 Feb 01/80 1061 72-1061

_Orig.

Jul 04/73 1067 72-1 067

Orig.

Jul 04/73 1069 72-1 069

_Orig.

Jul 04/73

1071 72-1071 1 Cancelled

_{Superseded by}

SB1112 No Effect

1073 72-1073 2 Oct 04/76

1078 72-1 078

Orig.

Jul 04/73 1083 72-1083 1 Cancelled

_{Superseded by}

SB1255 No Effect

1088 72-1 088

_Orig.

Nov 15/73 1094 72-1 094

Orig.

Jul 04/73

1095 72-1 095

Orig.

Jul 04/73

1096 72-1096 1 Cancelled

Superseded by

SB1155 No Effect

1102 72-1102

_Orig.

Jul 04/73

1103 72-1103 2 Jul 04/73

(20)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL

MANUAL PART NO.3015442

_Engine

Model

_{Applicability}

_Incorporated

1105 72-1105

_Orig.

No Effect

1109 72-1109

_Orig.

No Effect 1111 72-1111

Orig.

No Effect

1112 72-1112

_Orig.

Jul 04/73

1

1114 72-1114

Orig.

Never Issued No Effect

1118 72-1118 1 Jan 12/79 1124 72-1124 1 No Effect 1127 72-1127

Orig.

Nov 15/73 1134 72-1134

Orig.

Jul 04/73 1137 72-1137

_Orig.

Jul 04/73

1

1138 72-1138 3 No Effect 1139 72-1139

_Orig.

Jul 04/73 1140 72-1140

Orig.

No Effect 1141 72-1141

_Orig.

No Effect 1142 72-1142

Orig.

No Effect 1143 72-1143

_Orig.

Jul 04/73 1144 72-1144 1 Oct08/85

1

1146 72-1146

_Orig.

No Effect 1147 72-1147

Orig.

Jul 04/73 1148 72-1148 2 No Effect 1149 72-1149 4 No Effect 1150 72-11 50

Orig.

Nov 15/73 1151 72-1151 4 Jan 12/79 1155 72-1155 1 Oct 08/85

1

1156 72-1156

_Orig.

No Effect 1157 72-1157 1 Oct 08/85 1165 72-1165

_Orig.

Jul 04/73 1166 72-1166 1 No Effect 1167 72-1167 3 No Effect 1168 72-1168

Orig.

No Effect 1171 72-1171 1 Cancelled

_{Superseded by}

SB1287 No Effect

1173 72-1173

_Orig.

No Effect

1174 72-1174 1 Cancelled

_{Superseded by}

SB1103 No Effect 1176 72-1176

_Orig.

No Effect 1177 72-1177 3 No Effect 1179 72-1179

Orig.

No Effect 1180 72-1180

Orig.

Jul 04/73

1

1181 72-1181

_Orig.

No Effect 1182 72-1182 1 Oct 04/76 1183 72-1183 1 Oct 04/76 1185 72-1185

Orig.

Oct 04/76 1188 72-1188 3 No Effect 1191 72-1191 3 No Effect 1194 72-1194 1 Mar 15/78

(21)

_{Engine ModelApplicability}

Incorporated

1195 72-1195

Orig.

No Effect 1198 72-1198 2

Sep

18/81 1200 72-1200 1 No Effect 1203 72-1203

Orig.

No Effect 1206 72-1206 2 Jun 02/75 1207 72-1207 1 No Effect 1210 72-1210 2 Mar 15/78 1212 72-1212 2 Oct 08/85

1213 72-1213 3 Cancelled

_{Superseded by}

SB1234 No Effect

1217 72-1217 4 Jan 12/79 1218 72-1218 3 Oct 04/76 1221 72-1221

Orig.

No Effect 1223 72-1223 6 No Effect 1224 72-1224 2 No Effect 1226 72-1226 1 No Effect 1227 72-1227 3 Mar 15/78 1228 72-1228 2 No Effect 1232 72-1232 2 No Effect 1233 72-1233 2 No Effect 1234 72-1234 1 Oct 04/76 1236 72-1236 2 No Effect 1239 72-1239

Orig.

No Effect 1240 72-1240 3 No Effect

1244 72-1 244 20 PTGA-6/-6PJ-6B/-2 0/-2 0A/-20 B See NOTE

1245 72-1 245 3

Sep

18/81 1246 72-1 246 3

Sep

18/81 1247 72-1 247 5 Feb 14/83 1248 72-1248 2 No Effect 1249 72-1249

_Orig.

May

09/77 1254 72-1254

Orig.

No Effect 1255 72-1255 4 No Effect 1257 72-1257 3 No Effect 1258 72-1258 4 No Effect 1261 72-1261 2 No Effect 1262 72-1262 2 No Effect 1263 72-1263 2 No Effect 1267 72-1267

Orig.

No Effect 1268 72-1268

_Orig.

No Effect 1270 72-1270 1 No Effect 1272 72-1272 2 Cancelled No Effect 1273 72-1273

_Orig.

No Effect 1275 72-1275 1 No Effect 1276 72-1 276 3

Sep

18/81 1277 72-1277 2 No Effect

(22)

PRATT

WHITNEY CANADA

Engine

Model

_{Applicability}

Incorporated

1281 72-1281 2 No Effect 1285 72-1285 1 No Effect 1287 72-1287 2 No Effect 1293 72-1293 1 No Effect 1294 72-1294 1

Sep

30/86 1297 72-1297 1 No Effect 1299 72-1299

Orig.

No Effect 1300 72-1300 1 No Effect 1316 72-1316 1 Feb 14/83 1318 72-1318 3 No Effect 1321 72-1321 2 No Effect 1322 72-1322

_Orig.

No Effect 1323

72-1323

1 No Effect 1324 72-1324 3

Sep

30/86 1328 72-1328

_Orig.

Orig.

No Effect 1338 72-1338 2 No Effect 1339 72-1339 2 No Effect 1354 72-1354 3 No Effect 1357 72-1357 2 No Effect 1359 72-1359

Orig.

No Effect 1361 72-1361

_Orig.

No Effect 1367 72-1367 3 No Effect 1377 72-1377 3 No Effect 1379 72-1379 2 Jun 01/89 1381 72-1381 3 No Effect 1386 72-1386 3 No Effect 1389 72-1389 1 No Effect 1390 72-1390 6

Apr11/88

1391 72-1391 2

Sep

30/86 1395 72-1395

Orig.

No Effect 1397 72-1397 3 No Effect 1398 72-1398 2 Cancelled No Effect 1404 72-1404 7 No Effect 1409 72-1409 1 No Effect 1413 72-1413 1 No Effect 1414 72-1414

_Orig.

Sep

30/86 1415 72-1415

Orig.

_Orig.

No Effect 1419 72-1419

_Orig.

No Effect 1423 72-1423 1 No Effect 1427 72-1427 2 No Effect

(23)

P&WC ATA Effect/Date SE No. SE No. Rev. No.

_{Engine ModelApplicability}

Incorporated

1429 72-1429 2 No Effect 1430 72-1430 4 No Effect 1431 72-1431 1 No Effect 1439 72-1439 2 Jun 01/89 1441 72-1441 2 No Effect 1447 72-1447 2 No Effect 1457 72-1457 1 No Effect 1465 72-1465 1 No Effect 1466 72-1465

Orig.

_Orig.

No Effect 1476 72-1476

_Orig.

No Effect 1478 72-1478

_Orig.

No Effect 1479 72-1479 1 No Effect 1481 72-1481 1 No Effect 1484 72-1484 1 No Effect 1485 72-1485

Orig.

No Effect 1486 72-1486

_Orig.

No Effect 1489 72-1489

Orig.

No Effect 1490 72-1490

Orig.

_Orig.

No Effect 1498 72-1498

Orig.

No Effect 1501 72-1501

_Orig.

No Effect 1503 72-1503

Orig.

Feb 27/98 1506 72-1506 1 No Effect 1508 72-1508

_Orig.

No Effect 1509 72-1509

Orig.

No Effect 1518 72-1518

Orig.

No Effect 1522 72-1522

_Orig.

No Effect 1524 72-1524

Orig.

No Effect 1527 72-1527

_Orig.

No Effect 1554 72-1554

Orig.

_Orig.

No Effect 1564 72-1564 3 No Effect 1567 72-1567 2 No Effect 1568 72-1568 2 No Effect

(24)

PRATT

WHITNEY CANADA

IVIAINTENANCE MANUAL

F~&WC ATA Effect/Date

_{Engine ModelApplicability}

_Incorporated

1571 72-1571 2 No Effect 1578 72-1578 1 No Effect 1587 72-1587

Orig.

No Effect 1597 72-1597

_Orig.

No Effect 1606 72-1606

Orig.

No Effect

(25)

TABLE OF CONTENTS

SUBJECT PAGE

AIRWORTHINESS LIMITATIONS

(26)

PRATT

WHITNEY CANADA

PART

SECTION PAGE DATE

LEP 1 Feb 01/2002 2 blank Feb 01/2002

Contents 1 Feb 01/2002 2 blank Feb 01/2002

Airworthiness 1 Feb 01/2002

(27)

AIRWORTHINESS LIMITATIONS 1. General

The Airworthiness Limitations section

_{specifies mandatory}

Rotor

_Component

Service Life

Limits,

Scheduled

_{Inspection/Maintenance}

Intervals and

_approved

Oils and Fuels

_required

for

type

certification. The Airworthiness Limitations section is

_{approved by}

the Canadian

Ministerof

_Transport

and

_specifies

maintenance

_{required by}

_any

_applicable

airworthiness or

operational

rule unless an alternative program has been

approved

by

the Canadian

Minister of

_Transport.

For Rotor

_Component

Service Life Limits refer to the latest revision of P&WC S.B. No.1002. For Time Between Overhauls and Hot Section

_{Inspection Frequency}

refer to the latest revision of P&WC S.B. No.1003.

Approved

Oils are listed in the latest revision of P&WC S.B. No.1001.

(28)

PA RT

DESCRIPTION

OF

ENGINE

(29)

TABLE OF CONTENTS

SUBJECT PAGE

PART 1 DESCRIPTION OF ENGINE

SECTION 1 GENERAL INFORMATION AND DESCRIPTION INTRODUCTION 1. GENERAL 1-1-1 2. MAINTENANCE CONCEPT 1-1-2 3. CUSTOMER SUPPORT 1-1-2 4. ACCESSORIES SUPPORT 1-1-2 5. SUPPLEMENTARY PUBLICATION 1-1-2 6. SERVICE BULLETINS 1-1-2 7. DIRECTIONAL REFERENCES 1-1-3

3. FITS AND CLEARANCES 1-1-3

9. TOOL PROCUREMENT 1-1-3

10. SUPPLIERS AND SUPPLIER SERVICES 1-1-3

11. CONSUMABLE MATERIALS 1-1-3

SECTION 2 LEADING PARTICULARS AND SPECIFICATIONS

1. GENERAL 1-2-1

2. FRONTAND REAR ACCESSORY DRIVES _1-2-2

3. FUEL AND LUBRICATION SYSTEMS 1-2-2 4. METAL SHIPPING CONTAINER 1-2-4 5. FIBERBOARD SHIPPING CONTAINER 1-2-4 SECTION 3 GENERAL INFORMATION

1. GENERAL 1-3-1

SECTION 4 DETAILED INFORMATION

1. GENERAL _1-4-1

(30)

PRA~T

WHITNEY

CANADA

TABLE OF CONTENTS

SUBJECT PAGE

SECTION 4 DETAILED INFORMATION

_(Cont’d)

3. COMPRESSOR ROTOR AND STATOR ASSEMBLY 1-4-1 4. GAS GENERATOR CASE 1-4-7 5. COMBUSTION CHAMBER LINER 1-4-11

6. TURBINE SECTION 1-4-11

7. COMPRESSOR TURBINE VANES 1-4-11

8. COMPRESSOR TURBINE 1-4-15

9. INTERSTAGE BAFFLE 1-4-15

10. POWER TURBINE VANES 1-4-15 11. POWER TURBINE 1-4-15 12. POWER TURBINE SUPPORT HOUSING 1-4-16 13. NO. 3 AND 4 BEARINGS 1-4-16 14. REDUCTION GEARBOX

_{(PTGA-SERIES ENGINES)-}

TWO

STAGE 1-4-16

15. TORQUEMETER 1-4-20

16. EXHAUST DUCT 1-4-21

17. ACCESSORY GEARBOX 1-4-21

18. ENGINE LIFTING POINTS 1-4-23

SECTION 5 -AIR SYSTEMS

1. GENERAL 1-5-1

2. COMPRESSOR BLEED VALVE 1-5-1

3. BEARING COMPARTMENT

SEALS,

TURBINE COOLING AND

AIR BLEED SYSTEMS 1-5-1

SECTION 6 LUBRICATION SYSTEM

1. GENERAL 1-6-1

2. OIL TANK 1-6-1

(31)

TABLE OF CONTENTS

SUBJECT PAGE

SECTION 6 LUBRICATION SYSTEM

_(Cont’d)

4. OIL FILTERASSEMBLY 1-6-1 5. OIL PRESSURE SYSTEM 1-6-3 6. PITCH REVERSING VALVE SYSTEM

_{(PT6A-6A ENGINES)}

1-6-7

7. SCAVENGE OIL SYSTEM 1-6-7

8. BREATHER SYSTEM 1-6-8 9. CENTRIFUGAL

BREATHER

1-6-8

10. OIL-TO-FUELHEATER 1-6-9

11. OIL SYSTEM INSTRUMENTATION 1-6-9

SECTION 7 IGNITION SYSTEM

GLOW PLUG TYPE

(PRE-SB1429)

1. GENERAL 1-7-1

2. IGNITION CURRENT REGULATOR 1-7-1

3. GLOW PLUGS 1-7-1

SPARK IGNITER TYPE

_{(POST-SB1429)}

4. GENERAL 1-7-4

5. IGNITION EXCITER 1-7-4

6. SPARK IGNITERS 1-7-4

SECTION 8 FUEL SYSTEM

INTRODUCTION

1. GENERAL 1-8-1

FUEL PUMP

(VANE TYPE)

2. GENERAL 1-8-1

FUEL PUMP

_{(GEAR TYPE)}

(32)

PRATT

WHITNEY CANADA

TABLE OF CONTENTS

SUBJECT PAGE

_(Cont’d)

FUEL CONTROL SYSTEM

4. GENERAL 1-8-5

FUEL CONTROL UNIT

5. GENERAL 1-8-9

6. FUEL SYSTEM 1-8-9

7. POWER

INPUT,

SPEED

GOVERNOR,

AND ENRICHMENT

SECTION 1-8-11

8. BELLOWS SECTION 1-8-13

POWER TURBINE GOVERNOR

_(PT6A-6

SERIES AND PT6A-20

ENGINES)

9. GENERAL 1-8-16

PROPELLER GOVERNOR

(PT6A-20A

AND -208

ENGINES)

10. GENERAL 1-8-17

TEMPERATURE COMPENSATOR

11. GENERAL _1-8-17

FUEL CONTROL SYSTEM COMPLETE OPERATION

(TYPICAL)

12. ENGINE STARTING 1-8-17

13. ACCELERATION 1-8-20

14. GOVERNING 1-8-20

15. ALTITUDE COMPENSATION 1-8-20

16. DECELERATION _1-8-21

17. REVERSETHRUST OPERATION 1-8-21

18. STOPPING THE ENGINE 1-8-22

FUEL DUMP VALVE

(33)

TABLE OF CONTENTS

SUBJECT PAGE

_(Cont’d)

FUEL MANIFOLDAND SPRAY NOZZLES

20. GENERAL _1-8-22

21. FU EL MAN IFOLD ADAPTERASSEMBLY 1 -8-24 SECTION 9 ENGINE CONTROLS AND INSTRUMENTATION

1. GENERAL 1-9-1

2. POWER CONTROL LEVER 1-9-1 3. FUEL SHUT-OFF LEVER

_(PT6A-6A,

-68, -6/C20,

-20,

-20A AND

-208

_ENGINES)

1-9-1

4. PROPELLER CONTROLLEVER

_(PT6A-6,

-6A, -6B, -6/C20,

-20,

-20A AND -208

_ENGINES)

_1-9-1 5. INTERTURBINETEMPERATURE SENSING SYSTEM

_(T5)

(PT6A-6/C20,

-20,

-20A AND -208

ENGINES)

1-9-2

6. TURBINE TEMPERATURE SENSING SYSTEM

_{(T4) (PT6A-6,}

-6A

AND -68

_ENGINES)

1-9-2

7. OIL PRESSURE INDICATOR _1-9-2

8. OILTEMPERATURE INDICATOR 1-9-5 9.

TACHQM ETE

R-G EN E RATOR GAS GEN ERATOR

_(Ng)

1-9-5 10. TAC HOM ETER-GEN ERATOR POWER TU RE I N E

_(Nf)

1 -9-5

11. TORQUEMETER 1-9-5

SECTION 10- PROPELLER NON-REVERSING INSTALLATION

(PT6A-6

ENGINES)

1. GENERAL 1-10-1

2. PROPELLER 1-10-1

3. PROPELLER GOVERNOR _1-10-1

4. PROPELLER GOVERNOR ON-SPEED CYCLE 1-10-3 5. PROPELLER GOVERNOR OVERSPEED CYCLE 1 1-10-3

(34)

PRA~T

WHITNEY

CANADA

MAINTENANCE MANUAL

MANUALPART NO. 3015442

TABLE OF CONTENTS

SUBJECT FAGE

SECTION 10 PROPELLER NON-REVERSING INSTALLATION

(Cont’d)

6. PROPELLER GOVERNOR UNDERSPEED CYCLE 1;10-3

7. PROPELLER OVERSPEED GOVERNOR 1-10-5

8. POWER TURBINE GOVERNOR 1-10-5

SECTION 11 PROPELLER REVERSING INSTALLATION

(PT6A-6A ENGINES)

1. GENERAL 1-11-1

2. PROPELLER 1-11-1

3. PROPELLER GOVERNOR 1-11-3

4. PROPELLER GOVERNOR ON-SPEED CYCLE 1-11-3

5. PROPELLER GOVERNOR OVERSPEED CYCLE _1-11-5

6. PROPELLER GOVERNOR UNDERSPEED CYCLE 1-11-5

9. PITCH REVERSING VALVE AND LINKAGE 1-11-6

10. PROPELLER REVERSING INTERCONNECTING LINKAGE 1-11-7

11. LOW PITCH CONTROL CYCLE 1-11-7

12. HIGH PITCH CONTROL CYCLE 1-11-9

13. REVERSE PITCH CONTROL CYCLE _1-11-9

14. REVERSE TO LOW PITCH CONTROLCYCLE 1-11-10

(PT6A-6B

PT6A-20)

1. GENERAL 1-12-1

2. PROPELLER 1-12-1

(35)

TABLE OF CONTENTS

SUBJECT FAGE

(Cont’d)

4. PROPELLER GOVERNOR ON-SPEED CYCLE _1-12-5

5. PROPELLER GOVERNOR OVERSPEED CYCLE 1-12-5

6. PROPELLER GOVERNOR UNDERSPEED CYCLE 1-12-5

9. FUEL CUT-OFF LEVER 1-12-6 10. POWER CONTROL LEVER 1-12-9

11. NON-STOL APPLICATIONS 1-12-10

(PT6A-20A

AND PT6A-20B

ENGINES)

1. GENERAL 1-13-1

2. PROPELLER 1-13-1

3. PROPELLER GOVERNOR 1-13-5

4. PROPELLER GOVERNOR ON-SPEED CYCLE 1-13-10 5. PROPELLER GOVERNOR OVERSPEED CYCLE 1-13-10

6. PROPELLER GOVERNOR UNDERSPEED CYCLE _1-13-11

7. PROPELLER OVERSPEED GOVERNOR 1-13-11 8. NON-STOLAPPLICATIONS 1-13-11

(36)

PRA~

WHITNEY

CANADA

PART PART

SECTION PAGE DATE SECTION FAGE DATE

LEP 1

_Aug

27/2004 1-3-8 blank Feb 01/2002

2

_Aug

27/2004 1-3-9 Feb 01/2002 3

_Aug

27/2004 1-3-10 Feb 01/2002

4blank

_Aug

27/2004 1-3-11 Feb 01/2002 1-3-12 Feb 01/2002

Contents 1

_Aug

27/2004 1-3-13 Feb 01/2002

2

_Aug

27/2004 1-3-14 Feb 01/2002 3

_Aug

27/2004 1-3-15 Feb 01/2002 4

_Aug

27/2004 1-3-16 Feb 01/2002 5

_Aug

27/2004 1-3-17 Feb 01/2002 6

Aug

27/2004 1-3-18 Feb 01/2002 7

_Aug

27/2004 1-3-19 Feb 01/2002 8 blank

_Aug

27/2004 1-3-20 Feb 01/2002

List of 1

_Aug

27/2004

Figures

2

_Aug

27/2004 Section 4 1-4-1 Feb 01/2002

3

_Aug

27/2004 1-4-2 blank Feb01/2002

4 blank

_Aug

27/2004 1-4-3 Feb 01/2002 1-4-4 blank Feb01/2002

List of 1

_Aug

27/2004 1-4-5 Feb01/2002

Tables 2 blank

_Aug

27/2004 1-4-6 Feb 01/2002

1-4-7 Feb 01/2002

Section 1 1-1-1

_Aug

27/2004 1-4-8 blank Feb 01/2002 1-1-2

Aug

27/2004 1-4-9 Feb 01/2002 1-1-3

_Aug

27/2004 1-4-10 blank Feb 01/2002 1-1-4blank

_Aug

27/2004 1-4-11 Feb 01/2002 1-4-12 Feb 01/2002

Section 2 1-2-1 Feb 01/2002 1-4-13 Feb 01/2002

1-2-2 Feb 01/2002 1-4-14 blank Feb 01/2002 1-2-3 Feb 01/2002 1-4-15 Feb 01/2002 1-2-4 Feb 01/2002 1-4-16 Feb 01/2002 1-2-5 Feb 01/2002 1-4-17 Feb 01/2002 1-2-6blank Feb 01/2002 1-4-18 Feb 01/2002 1-4-19 Feb 01/2002

Section 3 1-3-1 Feb01/2002 1-4-20 Feb 01/2002

1-3-2 Feb 01/2002 1-4-21 Feb 01/2002 1-3-3 Feb 01/2002 1-4-22 Feb 01/2002

1-3-4 blank Feb01/2002 1-4-23 Feb 01/2002

1-3-5 Feb01/2002 1-4-24 Feb 01/2002 1-3-6 blank Feb 01/2002 1-4-25 Feb 01/2002

(37)

PART PART

SECTION FAG E DATE SECTION FAGE DATE

Section 5 1-5-1 Feb 01/2002 1-8-21 Feb 01/2002 1-5-2 Feb 01/2002 1-8-22 Feb 01/2002 1-5-3 Feb 01/2002 1-8-23 Feb01/2002

1-5-4 Feb 01/2002 1-8-24 Feb01/2002

1-8-25 Feb01/2002

Section 6 1-6-1 Feb 01/2002 1-8-26 blank Feb01/2002

1-6-2 Feb 01/2002

1-6-3 Feb 01/2002 Section 9 1-9-1 Feb 01/2002

1-6-4 blank Feb 01/2002 1-9-2 Feb 01/2002

1-6-5 Feb 01/2002 1-9-3 Feb 01/2002

1-6-6 blank Feb 01/2002 1-9-4 Feb 01/2002 1-6-7 Feb 01/2002 1-9-5 Feb 01/2002

1-6-8 Feb 01/2002 1-9-6 blank Feb 01/2002 1-6-9 Feb 01/2002

1-6-10 Feb 01/2002 Section 10 1-10-1 Feb 01/2002 1-10-2 Feb 01/2002

Section 7 1-7-1 Feb 01/2002 1-10-3 Feb01/2002

1-7-2 Feb 01/2002 1-10-4 Feb 01/2002

1-7-3 Feb 01/2002 1-10-5 Feb 01/2002 1-7-4 Feb 01/2002 1-10-6 blank Feb 01/2002

Section 8 1-8-1 Feb 01/2002 Section 11 1-11-1 Feb 01/2002

1-8-2blank Feb 01/2002 1-11-2 Feb 01/2002

1-8-3 Feb01/2002 1-11-3 Feb 01/2002

1-8-4blank Feb 01/2002 1-11-4 Feb01/2002

1-8-5 Feb 01/2002 1-11-5’ Feb01/2002

1-8-6 blank Feb 01/2002 1-11-6 Feb01/2002

1-8-7 Feb 01/2002 1-11-7 Feb 01/2002 1-8-8 blank Feb 01/2002 1-11-8 Feb 01/2002 1-8-9 Feb 01/2002 1-11-9 Feb 01/2002

1-8-10 Feb 01/2002 1-11-10 Feb 01/2002

1-8-11 Feb 01/2002

1-8-12 Feb 01/2002 Section 12 1-12-1 Feb01/2002

1-8-13 Feb 01/2002 1-12-2 Feb 01/2002 1-8-14 Feb 01/2002 1-12-3 Feb 01/2002 1-8-15 Feb 01/2002 1-12-4 Feb 01/2002 1-8-16 Feb 01/2002 1-12-5 Feb 01/2002 1-8-17 Feb 01/2002 1-12-6 Feb 01/2002 1-8-18 Feb 01/2002 1-12-7 Feb 01/2002

1-8-19 Feb 01/2002 1-12-8 blank Feb 01/2002 1-8-20 Feb 01/2002 1-12-9 Feb01/2002

(38)

PRATT

WHITNEY

CANADA

PART

SECTION FAG E DATE 1-12-10 Feb 01/2002 Section 13 1-13-1 Feb 01/2002 1-13-2 blank Feb 01/2002 1-13-3 Feb 01/2002 1-13-4 blank Feb 01/2002 1-13-5 Feb 01/2002 1-13-6 blank Feb 01/2002 1-13-7 Feb 01/2002 1-13-8 blank Feb 01/2002 1-13-9 Feb 01/2002 1-13-10 Feb 01/2002 1-13-11 Feb 01/2002 1-13-12 blank Feb 01/2002

(39)

FIGURE

LIST OF FIGURES

PAGE

Front and Rear

_Accessory

Drives

_Leading

Particulars

_Figure

1-2-1 1-2-3

PT6

_Engine

-Cross Section

_{(Typical) Figure}

1-3-1 1-3-3

PT6

_Engine

-Airflow

_Figure

1-3-2 1-3-5

Typical

PT6

_{Engine Figure}

1-3-3 1-3-7

PT6A-6 Series

_Engines

_Right

Front View

_Figure

1-3-4 1-3-9

PT6A-6 Series

_Engines

_Right

Rear View

_Figure

1-3-5 1-3-10 PT6A-6 Series

_Engines

Left Front View

_Figure

1-3-6 1-3-11 PT6A-6 Series

_Engines

Left Rear View

_Figure

1-3-7 1-3-12

PT6A-20

_Engine

_Right

FrontView

_Figure

1-3-8 1-3-13

PT6A-20

_Engine

_Right

Rear View

_Figure

1-3-9 1-3-14 PT6A-20

_Engine

Left Front View

_Figure

1-3-10 1-3-15 PT6A-20

_Engine

Left Rear View

_Figure

1-3-11 1-3-16

PT6A-20A

_Engine

_Right

Front View

_Figure

1-3-12 1-3-17

PT6A-20A

_Engine

_Right

Rear View

_Figure

1-3-13 1-3-18

PT6A-20A

_Engine

Left Front View

_Figure

1-3-14 1-3-19

PT6A-20A

_Engine

Left Rear View

_Figure

1-3-15 1-3-20

PT6

_Engine

_Exploded

View

_{(Typical) Figure}

1-4-1 _1-4-3

Compressor

Inlet Case

_Figure

1-4-2 1-4-5

Compressor

Rotor and Stater

_Assembly

and No.l

_Bearing

Area

_Figure

1-4-3 1-4-6

Main

_Bearing

Installation

_{(Typical) Figure}

1-4-4 1-4-9

Combustion Chamber Liner

_Figure

1-4-5 1-4-12

Compressor

and Power Turbine Area

_Figure

1-4-6 1-4-13

PowerTurbine No. 3 and No. 4

_Bearing

Areas

_Figure

1-4-7 _1-4-17 Two

_Stage

Reduction Gearbox Cross Section

_Figure

1-4-8 1-4-18 Two

_Stage

Reduction Gearbox Cross Section

_Figure

1-4-9 1-4-19

(40)

PRATT

WHITNEY

CANADA

LIST OF FIGURES

PAGE FIGURE

Twin Outlet Port Exhaust Duct

_{(Typical) Figure}

1-4-11 1-4-24

Accessory

Gearbox Cross Section

_Figure

1-4-12 1-4-25

Compressor

Bleed Valve Schematic

_Figure

1-5-1 1-5-2

Bearing Compartment

Seals,

Turbine

Cooling

and Air Bleed

Systems (Typical)

Figure

1-5-2 1-5-3

Accessory

Gearbox Lubrication Schematic

_Figure

1-6-1 1-6-2

Engine

Lubrication Schematic PT6A-6/20

_Figure

1-6-2 1-6-5 Oil-to-Fuel Heater Flow Schematic

_Figure

1-6-3 1-6-10

Ignition

Current

Regulator

Circuit

_{Diagram Figure}

1-7-1 1-7-2 Glow

_Plug

Installation

_Figure

1-7-2 _1-7-3

Engine

Fuel

_System

Schematic

_Figure

1-8-1 1-8-3

Fuel Control

_System

Schematic

_Figure

1-8-2 1-8-7

Fuel Control Unit

_Figure

1-8-3 1-8-10 Drive

_{Body Assembly}

_{Operation Figure}

1-8-4 1-8-12

FCU Bellows Section Functional

_{Diagram Figure}

1-8-5 1-8-14 Manual Override

_{System Figure}

1-8-6 1-8-15

Temperature Compensator

Cross Section

_Figure

1-8-7 1-8-18 Fuel Ratio Curve for

_Starting

and Acceleration Schedules

_{(Typical) Figure}

1-8-8 1-8-19 Fuel Manifold

_Adapter

_Assembly

Front Cross Section

_Figure

1-8-9 1-8-23 Fuel Manifold

_{Adapter Assembly}

Front Cross Section

_Figure

1-8-10 1-8-25 Interturbine

_{Temperature (T5)}

_{Sensing System Figure}

1-9-1 1-9-3 Turbine Inlet

_{Temperature (T4) Sensing System Figure}

1-9-2 1-9-4

Typical Single-acting Propeller-

Schematic

_Figure

1-10-1 1-10-2

Propeller

Governor -Schematic

_Figure

1-10-2 1-10-4

Propeller Reversing

Installation Schematic

_Figure

1-11-1 1-11-2

(41)

FIGURE

LIST OF FIGURES

PAGE

Propeller

Control Lever Cam Slot

_{Terminology Figure}

1-11-3 1-11-8

Propeller Reversing

_Figure

1-12-1 1-12-2

Propeller Reversing

Installation Reduction Gearbox

_Figure

1-12-2 1-12-4

Engine

Controls and

_Reversing

Installation

_Figure

1-12-3 1-12-7

Propeller Reversing

_Figure

1-13-1 1-13-3

(42)

PRATT

WHITNEV

CANADA

LIST OF TABLES

TITLE PAGE

TABLE

1-2-1,

Engine Specifications

1-2-1 TABLE

_1-2-2,

_{Engine Leading}

Particulars 1-2-1 TABLE

1-2-3,

Accessory

Drives

_Leading

Particulars 1-2-2 TABLE

1-2-4,

Fuel and Lubrication

_{System Specifications}

1-2-4 TABLE

1-2-5,

Metal

Shipping

Container Data 1-2-4 TABLE

1-2-6,

Fiberboard

_Shipping

Container Data

_(PT6A-6,

-6A,

-6B

_Engines)

-Type

PK562 1-2-4

(43)

´•I

SECTION 1 GENERAL INFORMATION AND DESCRIPTION

INTRODUCTION

1. GENERAL

A. This

_publication

is

_compiled

and issued

_by

the Customer

_Support

_Department

of Pratt

Whitney

Canada,

Longueuil,

Quebec,

Canada. It includes

approved

and recommended

maintenance

_procedures

for

_{turboprop engine}

models

PT6A-6, -6A, -6B, -6/C20,

-20,

-20A and -20B. The PT6A-6/C20 is a -6 reworked

_by

the manufacturer to -20

configuration.

The PT6A-20A is similar to the -20

_except

for

_{reversing linkage}

and exhaust duct. The PT6A-20B is modified from the -20

_SB1206)

to have

_{reversing linkage}

similarto the -20A. All

_turboprop

models

_except

PT6A-6 have

_{reversing pitch propeller}

installations.

B. Because the PTGA-Series

_engines

are under a

_continuing

_program of

improvements

in

design

and

manufacture,

it is

_anticipated

that the _appearance of certain

_parts

or details

may

change

as refinements are introduced.

However,

this

publication

will be revised

as _necessary to

_incorporate

the latest

_approved

data.

C.

_Requests

for

_pertinent

information not covered in this

_publication

and

_suggestions

for

modification or

_{amplification}

of these instructions so as to increase their

usefulness,

will be welcomed

_by

the Customer

_{Support Department}

of Pratt

_Whitney

Canada. D.

_{Any discrepancies, problems}

or

suggestions regarding

this

publication

should be

forwarded in

_{writing, using}

the Pratt

_Whitney

Canada Customer Feedback Sheet

(RSVP),

to:

Pratt

_Whitney

Canada

_Corp.

1000 Marie-Victorin Blvd

Longueuil,

Quebec Canada J4G 1Al

Attention:

_Manager

Publications

_{Dept (01PB4)}

Website: www.pwc.ca

E-mail:

_{publications@}

_pwc.ca

E. Customer Feedback Sheets are enclosed with new manuals and each

subsequent

revision. Additional forms _maybe obtained

_{by contacting:}

The

Supervisor,

Publications Customer

Services,

at the above address.

F. The on-line Customer Feedback Sheet

_{(RSVP form)}

is also available on the Pratt

(44)

PRATT

WHITNEY

CANADA

2. MAINTENANCE CONCEPT

A. The maintenance functions for the PT6

_engines

described in this manual are divided

into two basic

levels;

Line Maintenance and

_Heavy

Maintenance. The _{scope of Line} Maintenance consists of the removal and installation of external

_components,

_engine

accessories and Hot Section

_Inspection.

_Heavy

Maintenance details

_repairs

_normally

considered

_beyond

the

_capabilities

of the _average line maintenance

_shop.

_{The scope} consists of the removal and installation of

_engine

_components

and limited

_repairs

to the hot section area, reduction

gearbox

and accessory

gearbox. Repairs beyond

this

level are not recommended and should be

_{accomplished by}

an

_approved

overhaul

_facility.

For

_Engine

Condition Trend

_{Monitoring System}

referto Part

2,

Section 6.

3. CUSTOMER SUPPORT

A. Customer

_{Support representatives}

maintain contact with

_operators

and service activities and are available forthe

investigation

of _any

specific difficulty

or

problem.

Requests

for

assistance and/or AOG

_support

should be directed to:

Pratt

_Whitney

Canada

_Corp.

1000 Marie-Victorin Blvd.

Longueuil,Quebec

Canada J4G1A1

Attention: Customer

Support

B. Customer

_Help

Desk

_{(24-hour service):}

US and Canada: 1-800-268-8000

International: 450-647-8000 Fax: 450-647-2888

Telex: DELETED

Email:

_{customerhelpdeskQ}

_pwc.ca 4. ACCESSORIES SUPPORT

Accessories

_may

be sentfor

_repair

or

complete

overhaul to:

P&WC Accessories Services

333 rue

d’Auvergne

_{(Area 2K)}

Longueuil,

Quebec

Canada J4H 3Y3

5. SUPPLEMENTARY PUBLICATION

A. Personnel concerned with the maintenance of these

_engines

should familiarize themselves with the contents of the Parts

_{Catalog (P/N 3015444),}

which lists and describes the saleable

_parts

of the

_engines

and illustrates their

_{interrelationship.}

6. SERVICE BULLETINS

A. Service Bulletinswill be issued as

required

to

_provide

information or instructions for

(45)

7. DIRECTIONAL REFERENCES

A. The terms

_right

and

left,

clockwise and

counterclockwise,

upper and

lower,

and similar directional references will

_apply

to the

_engine

as viewed from the rearand the

engine

in a horizontal

position.

8. FITS AND CLEARANCES

A.

_During

all

_operations

which involve measurements,

frequent

reference should be made

to the Table of Fits and

Clearances,

Part 4. 9. TOOL PROCUREMENT

A.

Depending

on the

geographical

location of the

_{operator, requests}

for the

_purchase

of

special tools,

should be sent to:

(1)

United States:

Kell-Strom Tool Co. 214 Church Street

Wethersfield,

CT 06109 USA

TEL: 860-529-6851 or 1-800-851-6851

(USA

Canada),

or

860-721-0658

₍₂₄

hour service

_number)

FAX: 860-257-9694

(2)

Canada and Elsewhere: Pratt

_Whitney

Canada Inc. 1000 Marie-Victorin

Longueuil,

Quebec

Canada J4G1A1

Attention: Sales

_Department

10. SUPPLIERS AND SUPPLIER SERVICES

A. The names of any

companies provided

in this

publication

as a

possible

sourcefor

required

services or

supplies

are furnished for information purposes

only.

Pratt

_Whitney

Canada does not endorse the work

_performed

or

_{supplies procured}

from these

companies. Further,

Pratt

_Whitney

Canada does not

_accept

_{responsibility,}

to _any

degree,

for the selection of such

_companies

for such work

_performed

or

supplies procured.

11. CONSUMABLE MATERIALS

A. Part

2,

Section

8,

Table

2-8-1,

lists the consumable materials used in the maintenance of the

_engine.

B. Material

_Safety

Data Sheets

_{(MSDS) containing}

information about Trade

Name,

Safety

Hazards,

Health

Hazards,

Reactivity, Spill

or Leak

Procedures,

Special

Protection

Information,

Special

Precautions,

and

_{Transportation}

and

_Labelling

are available from

(46)

PRATT

WHITNEY

CANADA

PART 1 DESCRIPTION OF ENGINE

SECTION 2 LEADING PARTICULARS AND SPECIFICATIONS

1. GENERAL

A.

_{Leading particulars}

of the

PT6A-6, PT6A-6A, PT6A-6B, PT6A-20,

PT6A-20A and PT6A-20B

_engines

are as follows:

(Refer

to Tables 1-2-1 and

_1-2-2)

TABLE~1-2-1,

Engine Specifications

JP-4 Fuel

Consumption

LB/ESHP/HR Shaft RPM Jet Thrust AT 15"C

ESHP SHP

₍₃₎

_(Ib.)

_(59"F)

A-6 A-20 A-6 A-20 A-6 A-20 A-6 A-20 A-6 A-20 A-6A A-20A A-6A A-20A A-6A A-20A A-6A A-20A A-6A A-20A

Rating

A-6B A-20B A-6B A-20B A-6B A-20B A-6B A-20B A-6B A-20B Takeoff 578 579 550 550 2200 2200 70 72 0.650 0.649

(2)

Max. 525 579 500 550 2200 2200 62 72 0.670 0.649 Cent

₍₁₎

₍₂₎

Max. 525 566 500 538 2200 2200 62 70 0.670 0.653 Climb

₍₁₎

Max. 495 522 471 495 2200 2200 60 68 0.680 0.670 Cruise

(1)

Available to 18.3 "C

_(65"F)

Ambient

(2)

Available to 21.1 "C

_{(70 "F)}

ambient

(3)

Rotor

_Speed

Power Turbine

33,000

rpm

NOTE: Maximum Continuous is an _emergency

rating only.

TABLE

1-2-2,

Engine Leading

Particulars LEADING PARTICULARS

Engine Type

Free Turbine

Type

of combustion chamber Annular

Compression

ratio 6.3:1

Propeller

shaft rotation Clockwise

(looking FWD)

Propeller

shaft

_{configuration}

_Flanged

(47)

TABLE

1-2-2,

Engine Leading

Particulars

_(Cont’d)

LEADING PARTICULARS

Propeller

shaft gear ratio 0.0668:1

(PT6A-6

and -20

_Series)

Engine

diameter 19.0 in.

Basic at Room

_Temperature

_{(482.6 mm)}

Engine length

62.0 in.

Basic at Room

_Temperature

_{(1575 mm)}

(PT6A-6

and -20

Series)

Oil

_Consumption

0.2 Ib/hr

(maximum)

(0.091 kg/hr)

(10

hour

_period)

Dry weight, (Approximate)

275 Ib.

(Standard equipment)

(125 kg)

(PT6A-6

and -20

_Series)

2. FRONTAND REAR ACCESSORY DRIVES

A. For

_{leading particulars}

of the front and rear _accessory

drives,

refer to Table 1-2-3. TABLE

_1-2-3,

_Accessory

Drives

_Leading

Particulars

Max.

_Torque

Drive Pad Rotation Ratio Continuous Static

1

_{Starter-generator (1)}

CW 0.293:1 170 1600

2 Fuel

_{Pump/FCU (1)}

CCW 0.167:1

3

_Ng

Tach Generator

₍₁₎

CCW 0.112:1 7 100 4 Vacuum Air

_Pump

_(Optional)

₍₁₎

CCW 0.103:1 60 800

5

_{OptionalAccessory}

Drive

₍₁₎

CW 0.321:1 135 800

6

_{OptionalAccessory}

Drive

₍₁₎

CCW 0.203:1 150 800

7

_Propeller

Governor

₍₂₎

CW 0.1273:1 50 850

8 Nf Tach Generator

₍₂₎

CW 0.1273:1 7 100 9

_{Propeller OverspeedGovernor (2)}

CW 0.1273:1 70 850 NOTE: 1. Rear

_Accessory

Drives

₍₁₀₀

_Ng

37500

_rpm).

NOTE: 2. Front

_Accessory

Drives

₍₁₀₀

Nf 33000

_rpm).

3. FUEL AND LUBRICATION SYSTEMS

(48)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL

MANUAL PARTNO. 3015442

6

AS VIEWED FROM REAR

AS VIEWEDFROM FRONT

C7819B

Front and Rear

_Accessory

Drives

Leading

Particulars

(49)

TABLE

1-2-4,

Fuel and Lubrication

System Specifications

Nomenclature

Specification

Fuel

Specification

Refer to SE No. 1244

Oil

_{Specification}

Refer to SE No. 1001

Oil Tank Total

_Capacity

2.3 US

gallons (1.92

Imp.

gallons,

8.70

liters)

Oil Tank

_{Expansion Space}

0.7 US

_{gallons (0.58}

_Imp.

_gallons,

2.64

liters)

Oil Tank Usable

_Quantity

1.5 US

gallons (1.25

Imp.

gallons,

5.68

liters)

4. METALSHIPPING CONTAINER

A. For

_{leading particulars}

of the reusable

_engine

metal

_shipping

container,

referto Table

1-2-5.

TABLE

1-2-5,

Metal

_Shipping

Container Data

Description

Data

Length

79 inches

(2001 mm)

Width 34 inches

_{(864 mm)}

Height

38 inches

(965 mm)

Weight

400 Ib.

(181.4 kg)

Pressure Tested at 10

psig

Material

_{Specification}

SAE 1010-1020

Paint Primer Coat TT-P-664 Paint Finish Coat MIL-E-7729

Semi-gloss

5. FIBERBOARD SHIPPING CONTAINER

A. For

_{leading particulars}

of the non-reusable

_engine

fiberboard

_shipping

container,

referto

Table 1-2-6 or 1-2-7.

TABLE

1-2-6,

Fiberboard

Shipping

Container Data

(PT6A-6,

-6A,

-6B

_{Engines) -Type}

PK562

Description

Data

Length

73.5 inches

_{(1867 mm)}

Width 31.5 inches

(800 mm)

Height

37 inches

_{(940 mm)}

(50)

PRATT

WHITNEY CANADA

TABLE

_1-2-7,

Fiberboard

_Shipping

Container Data

_{(PT6A-20) -Type}

PK1325

Description

Data

Length

68 inches

(1727 mm)

Width 26 inches

_{(660 mm)}

Height

26 inches

(660 mm)

(51)

PART 1 DESCRIPTION OF ENGINE SECTION 3 GENERAL INFORMATION

1. GENERAL

A. The

_engines

described

_throughout

this

_publication

are variants of the basic PT6

powerplant

which is a

lightweight

free-turbine

engine designed

for use in fixed or

rotary-wing

aircraft. The PTGA series

_engines

for use in

fixed-wing

aircraft are available in

two

_{configurations:}

the PT6A-6 which utilizes a

_{non-reversing propeller}

and the

PT6A-6A, -6B, -6/C20,

-20,

-20A and -208

which,

though essentially

similar,

are

equipped

with additional features to

_provide

control for

_{reversing propeller applications.}

B. All

_engines

utilize two

independent

turbines;

one

driving

a _compressor in the _gas

generator section,

the second

_driving

reduction

_gearing

for

_propeller,

or

rotary-wing

operation. (See Figure 1-3-1)

C. Inlet air enters the

_{engine through}

and annular

_plenum

chamber formed

_by

the

compressor inlet case. From there it is directed to the compressor. The compressor consists of three axial

_stages

and one

_centrifugal

_stage

assembled as an

_integral

unit,

which

_provides

a

compression

ratio of 6.3:1.

D. A row of statervanes, located between each

stage

of

_compression,

diffuses the

air,

raises its static pressure and directs it to the next

_stage

of

_compression.

The

compressed

air is

_{passed through}

diffuser

_pipes,

turned

_ninety

_degrees

in

direction,

then led

_{through straightening}

vanes to the combustion chamber.

_{(See Figure 1-3-2)}

E. _{The combustion chamber liner located in the gas}

generator

case consists of an annular

reverse flow weldment with

varying

size

perforations

which

provide

an

_entry

for the

compressed

air. The flow of air

changes

direction to enter the combustion chamber liner where it reverses direction and mixes with fuel. The location of the combustion

chamber liner eliminates the need for a

long

shaft between the _compressorand the

turbine,

thus

_reducing

the overall

_length

and

_weight

of the

_engine.

F Fuel is

_injected

into the combustion chamber liner

_by

14

_simplex

nozzles

_supplied

_by

a common manifold. The fuel/air mixture is

ignited by

two

_glow

_plugs

_(Pre-SB1429)

or

spark igniters (Post-SB1429)

which

_protrude

into the combustion chamber liner. The resultant _gases

_expand

from the combustion chamber

liner,

reverse _{direction and pass}

through

the turbine

_guide

vanes to the _{compressor turbine. The turbine}

_guide

vanes ensure that the

expanding

_gases

impinge

on the turbine blades at the correct

_angle,

with minimum _{loss of energy.} The still

_expanding

_{gases pass forward}

_through

a second set of

_{stationary guide}

vanesto _{drive the power turbine.}

G. _{The compressor and power turbines} are located in the

approximate

centerof the

_engine

with their shafts

_extending

in

_opposite

directions. This

_provides

for

_simplified

installation

and

_{inspection procedures.}

The exhaust _{gas from} the _power turbine is directed

(52)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL

H. An _accessory _{gearcase is located} at the rear of the

engine

with the relevant _accessory

drives and

_mounting

_pads.

The accessories are driven from the compressor

_by

means

of a

coupling

shaft which extends the drive

_through

a conical tube in the oil tank

center-section. An

_integral

oil tankwith a

_capacity

of 2.3 U.S.

_{gallons (1.92 Imperial}

gallons:

8.70

_liters)

is

_provided

in the _compressor inlet case.

i. A

_{planetary gearbox}

located in the front of the

_{engine, provides}

the

_speed

reduction between _{the power}turbine and the

_propeller

shaft

_(PTGA

series

_engines).

The PTGA

series

_engines

have a two

_stage

_{planetary gearbox. Engine}

_output

is

_accurately

indicated

by

means of an

integral

_torquemeter

device located in the

_gearbox.

J. Stations and

_flanges

are shown on

Figure

1-3-3.

(53)

C5B PT6

_Engine

-Cross Section

_(Typical)

(54)

PRATT

WHITNEY CANADA

MAINTENANCE MANUAL MANUAL PART NO.3015442

1

4i

L)

t

1)

C552A PT6

_Engine

-Airflow

Figure

1-3-2