Front

TURBOPROP GAS TURBINE ENGINE

Model(s)

PT6A-6 SERIES AND -20 SERIES ENGINES

Manual Part No. 3015442

4 July 1973

The contents of this manual have been examined and found acceptable to the Ministerin meeting the requirements of an Engine Maintenance Manual for the Pratt & WhitneyCanada PT6-6 Series and PT6A-20 Series engine models, as required by theCanadian Airworthiness Manual, Chapter 533.4 ‘‘Instructions for Continued

Airworthiness’’.

MAINTENANCE MANUAL

PRATT & WHITNEY CANADA1000 Marie-Victorin, Longueuil, Quebec, Canada J4G 1A1

Jun 01/89© 1973 Pratt & Whitney Canada Corp.

PRINTED IN CANADA

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

PROPRIETARY NOTICE

This document contains matter of proprietary nature andis delivered on the express condition that it is not to bedisclosed or reproduced in whole or in part without thewritten consent of Pratt & Whitney Canada Corp. Thisrestriction does not limit the right to disclose informationobtained from other sources.

TO: Holders of the Pratt & Whitney Canada Maintenance Manual forPT6A-6/-6A/-6B/-20/-20A/-20B Engines, Manual Part No. 3015442.

SUBJECT: Revision No. 29, dated Jan 05/2007

Please insert the attached Revision No. 29 pages into your copy of the PT6A-6/-6A/-6B/-20/-20A/-20BMaintenance Manual. Remove and destroy superseded pages.

Extreme care should be exercised in updating your copy of the manual. To ensure that you do notinadvertently discard pages that should be retained, the manual should be updated in accordance withthe Lists of Effective Pages.

Pages supplied with the new date but no visible change may contain coding changes transparent tothe user and should be inserted as part of the revision.

Please add Revision No. 29 to the Record of Revisions.

The intent of Advance Revision AR-67 has been incorporated at this revision. All succeedingAdvance Revisions must be retained until incorporated.

Any discrepancies, problems or suggestions regarding this revision should be forwarded in writingusing the Pratt & Whitney Canada Customer Feedback Sheet (RSVP), and directed to:

Pratt & Whitney Canada Corp.1000 Marie-VictorinLongueuil, QuébecCanada J4G 1A1

Attention: Manager, Technical Publications (05MS1)Email: [email protected]: (450) 468-7688

Customer Feedback Sheets are contained with new manuals and each subsequent revision. Youmay also submit your feedback via our on-line RSVP form available at:www.pwc.ca/en/3_0/3_0_6/3_0_6_5_7.asp.

Pratt & Whitney Canada Corp.1000, Marie-VictorinLongueuil, Québec, Canada J4G 1A1Tél. 450-677-9411

January 16, 2007

REVISION TRANSMITTAL SHEET

Page 1HIGHLIGHTS Jan 05/2007

PT6A-6/-6A/-6B/-20/-20A/-20B MAINTENANCE MANUALREVISION NO. 29 HIGHLIGHTS

Location Description of Change

Advance Revision Index Advance Revision Index

Updated TR list.

Part 3Section 1

General

Revised tool supplier’s address information.

Deleted reference to geographic locations for orderingtooling (RSVP 21839).

Engine stand PWC51140 obsoleted and replaced withPWC70907 (PT402R2).

Part 3Section 3

General

Incorporated AR 67.

Part 4Section 1

General

Revised supplier’s address information.

Deleted reference to geographical locations for orderingtooling (RSVP 21839).

Engine stand PWC51140 obsoleted and replaced byPWC70907 (TSB PT402R2).

Pratt & Whitney Canada Corp.

Page 2HIGHLIGHTS Jan 05/2007

RECORD OF REVISIONS

REVNO.

ISSUEDATE

DATEINSERTED BY

1 Nov 15/73 P&WC

2 Jun 02/75 P&WC

3 Oct 04/76 P&WC

4 May 09/77 P&WC

5 Mar 15/78 P&WC

6 Jun 12/79 P&WC

7 Feb 01/80 P&WC

8 Sep 18/81 P&WC

9 Feb 14/83 P&WC

10 Oct 08/85 P&WC

11 Sep 30/86 P&WC

12 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 P&WC

21 Feb 01/2002 P&WC

22 Aug 16/2002 P&WC

23 Jun 06/2003 P&WC

24 Apr 02/2004 P&WC

25 Aug 27/2004 P&WC

26 Nov 26/2004 P&WC

27 Jun 10/2005 P&WC

28 Dec 02/2005 P&WC

29 Jan 05/2007 P&WC

REVNO.

ISSUEDATE

DATEINSERTED BY

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

RECORD OF REVISIONS Jul 04/73

RECORD OF ADVANCE REVISIONS

TR.NO. CH/SE/SU

PAGENO.

ISSUEDATE

INSERTEDBY

DATEREMOVED

REMOVEDBY

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

RECORD OF ARs Jul 04/73

PARTSECTION PAGE DATE

Title Page Jun 01/89

Record of Revisions Jul 04/73

Record of Advance Revisions Jul 04/73

LEP 1 Jan 05/20072 blank Jan 05/2007

Part/SectionList

1 Feb 01/20022 Feb 01/2002

AdvanceRevisionIndex

1 Jan 05/20072 blank Jan 05/2007

ServiceBulletinList

1 Apr 02/20042 Apr 02/20043 Apr 02/20044 Apr 02/20045 Apr 02/20046 Apr 02/2004

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

LIST OF EFFECTIVE PAGES

Page 1/2FRONT MATTER LEP Jan 05/2007

PART/SECTION LIST

PART/SECTION TITLE

AIRWORTHINESS LIMITATIONS Airworthiness 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-6AEngines)

1-12 Propeller Non-reversing Installation (PT6A-6B andPT6A-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

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 1PART/SECT LIST Feb 01/2002

PART/SECTION TITLE

3 LINE MAINTENANCE

3-1 Special Tools

3-2 Removal and Installation

3-3 Inspection

4 HEAVY MAINTENANCE

4-1 Special Tools

4-2 Removal and Installation

4-3 Inspection

4-4 Repair

4-5 Special Limits and Torque Recommendations

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 2PART/SECT LIST Feb 01/2002

ADVANCE REVISION INDEX

A.R. No. Filed Adjacent to A.R. Status

1 thru 3 Incorporated at Revision No. 1,dated 15 November 1973.

4 thru 26 Incorporated at Revision No. 2,dated 2 June 1975 .

27 thru 35 Incorporated at Revision No. 3,dated 4 October 1976 .

38 Incorporated at Revision No. 4,dated 9 May 1977.

39 thru 42 Incorporated at Revision No. 5,dated 15 March 1978.

43 Incorporated at Revision No. 6,dated 12 January 1979.

44 Incorporated at Revision No. 7,dated 1 February 1980.(AR 36 and 37 replaced by AR 45and 46.)

45, 46 Incorporated at Revision No. 11,dated 30 September 1986.

47 Incorporated at Revision No. 9,dated 14 February 1983.

48 thru 52 Incorporated at Revision No. 10,dated 8 October 1985.(AR51 cancelled AR50.)

53 thru 56 Incorporated at Revision No. 18,dated 15 November 1993.

57 thru 63 Incorporated at Revision No. 19,dated 27 February 1998.

64 Part 2, Section 2, page 16 Incorporated at Revision No. 23,dated 06 June 2003.

65 Part 3, Section 2, page 64 Incorporated at Revision No. 23,dated 06 June 2003.

66 Part 3, Section 2, page 66 Incorporated at Revision No. 23,dated 06 June 2003.

67 Part 3, Section 3, page 73 Incorporated at Revision No. 29dated 05 January 2007.

All succeeding Advance Revisions must be retained in your printed manual until directedotherwise by subsequent revision activity.

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 1/2AR LIST Jan 05/2007

SERVICE BULLETIN LIST

This list identifies all Service Bulletins (SB’s) for the PT6A-6 Series and PT6A-20 Series enginemodels. 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 andrelated documents.

All early PT6A-6 and PT6A-20 Series (Engine Model Group #01) engine ATA 72-Series ServiceBulletins are prefixed with Part No. 3026521 in lieu of a specific model identifier. New and recentlyrevised SBs have the prefix PT6A.

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 number3020772.

NOTE: The noted Service Bulletins are being continually revised to reflect P&WCrecommendations for oil, fuels, engine planned maintenance, etc., and are concurrentwith incorporation of engine modifications.

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1001 72-1001 23 PT6A-6/-6A/-6B/-20/-20A/-20B See NOTE1002 72-1002 23 PT6A-6/-6A/-6B/-20/-20A/-20B See NOTE1003 72-1003 28 PT6A-6/-6A/-6B See NOTE1024 72-1024 1 Feb 01/801038 72-1038 Orig. Jul 04/731040 72-1040 Orig. Nov 15/731043 72-1043 Orig. Jul 04/731045 72-1045 Orig. Jul 04/731046 72-1046 Orig. Jul 04/731047 72-1047 Orig. Nov 15/731056 72-1056 2 Feb 01/801061 72-1061 Orig. Jul 04/731067 72-1067 Orig. Jul 04/731069 72-1069 Orig. Jul 04/731071 72-1071 1 Cancelled - Superseded by SB1112 No Effect1073 72-1073 2 Oct 04/761078 72-1078 Orig. Jul 04/731083 72-1083 1 Cancelled - Superseded by SB1255 No Effect1088 72-1088 Orig. Nov 15/731094 72-1094 Orig. Jul 04/731095 72-1095 Orig. Jul 04/731096 72-1096 1 Cancelled - Superseded by SB1155 No Effect1102 72-1102 Orig. Jul 04/731103 72-1103 2 Jul 04/731104 72-1104 1 Jul 04/73

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 1SB LIST Apr 02/2004

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1105 72-1105 Orig. No Effect1109 72-1109 Orig. No Effect1111 72-1111 Orig. No Effect1112 72-1112 Orig. Jul 04/731114 72-1114 Orig. Never Issued No Effect1118 72-1118 1 Jan 12/791124 72-1124 1 No Effect1127 72-1127 Orig. Nov 15/731134 72-1134 Orig. Jul 04/731137 72-1137 Orig. Jul 04/731138 72-1138 3 No Effect1139 72-1139 Orig. Jul 04/731140 72-1140 Orig. No Effect1141 72-1141 Orig. No Effect1142 72-1142 Orig. No Effect1143 72-1143 Orig. Jul 04/731144 72-1144 1 Oct 08/851146 72-1146 Orig. No Effect1147 72-1147 Orig. Jul 04/731148 72-1148 2 No Effect1149 72-1149 4 No Effect1150 72-1150 Orig. Nov 15/731151 72-1151 4 Jan 12/791155 72-1155 1 Oct 08/851156 72-1156 Orig. No Effect1157 72-1157 1 Oct 08/851165 72-1165 Orig. Jul 04/731166 72-1166 1 No Effect1167 72-1167 3 No Effect1168 72-1168 Orig. No Effect1171 72-1171 1 Cancelled - Superseded by SB1287 No Effect1173 72-1173 Orig. No Effect1174 72-1174 1 Cancelled - Superseded by SB1103 No Effect1176 72-1176 Orig. No Effect1177 72-1177 3 No Effect1179 72-1179 Orig. No Effect1180 72-1180 Orig. Jul 04/731181 72-1181 Orig. No Effect1182 72-1182 1 Oct 04/761183 72-1183 1 Oct 04/761185 72-1185 Orig. Oct 04/761188 72-1188 3 No Effect1191 72-1191 3 No Effect1194 72-1194 1 Mar 15/78

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 2SB LIST Apr 02/2004

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1195 72-1195 Orig. No Effect1198 72-1198 2 Sep 18/811200 72-1200 1 No Effect1203 72-1203 Orig. No Effect1206 72-1206 2 Jun 02/751207 72-1207 1 No Effect1210 72-1210 2 Mar 15/781212 72-1212 2 Oct 08/851213 72-1213 3 Cancelled - Superseded by SB1234 No Effect1217 72-1217 4 Jan 12/791218 72-1218 3 Oct 04/761221 72-1221 Orig. No Effect1223 72-1223 6 No Effect1224 72-1224 2 No Effect1226 72-1226 1 No Effect1227 72-1227 3 Mar 15/781228 72-1228 2 No Effect1232 72-1232 2 No Effect1233 72-1233 2 No Effect1234 72-1234 1 Oct 04/761236 72-1236 2 No Effect1239 72-1239 Orig. No Effect1240 72-1240 3 No Effect1244 72-1244 20 PT6A-6/-6A/-6B/-20/-20A/-20B See NOTE1245 72-1245 3 Sep 18/811246 72-1246 3 Sep 18/811247 72-1247 5 Feb 14/831248 72-1248 2 No Effect1249 72-1249 Orig. May 09/771254 72-1254 Orig. No Effect1255 72-1255 4 No Effect1257 72-1257 3 No Effect1258 72-1258 4 No Effect1261 72-1261 2 No Effect1262 72-1262 2 No Effect1263 72-1263 2 No Effect1267 72-1267 Orig. No Effect1268 72-1268 Orig. No Effect1270 72-1270 1 No Effect1272 72-1272 2 Cancelled No Effect1273 72-1273 Orig. No Effect1275 72-1275 1 No Effect1276 72-1276 3 Sep 18/811277 72-1277 2 No Effect

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 3SB LIST Apr 02/2004

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1281 72-1281 2 No Effect1285 72-1285 1 No Effect1287 72-1287 2 No Effect1293 72-1293 1 No Effect1294 72-1294 1 Sep 30/861297 72-1297 1 No Effect1299 72-1299 Orig. No Effect1300 72-1300 1 No Effect1316 72-1316 1 Feb 14/831318 72-1318 3 No Effect1321 72-1321 2 No Effect1322 72-1322 Orig. No Effect1323 72-1323 1 No Effect1324 72-1324 3 Sep 30/861328 72-1328 Orig. No Effect1331 72-1331 1 No Effect1332 72-1332 Orig. No Effect1338 72-1338 2 No Effect1339 72-1339 2 No Effect1354 72-1354 3 No Effect1357 72-1357 2 No Effect1359 72-1359 Orig. No Effect1361 72-1361 Orig. No Effect1367 72-1367 3 No Effect1377 72-1377 3 No Effect1379 72-1379 2 Jun 01/891381 72-1381 3 No Effect1386 72-1386 3 No Effect1389 72-1389 1 No Effect1390 72-1390 6 Apr 11/881391 72-1391 2 Sep 30/861395 72-1395 Orig. No Effect1397 72-1397 3 No Effect1398 72-1398 2 Cancelled No Effect1404 72-1404 7 No Effect1409 72-1409 1 No Effect1413 72-1413 1 No Effect1414 72-1414 Orig. Sep 30/861415 72-1415 Orig. No Effect1416 72-1416 1 No Effect1417 72-1417 Orig. No Effect1419 72-1419 Orig. No Effect1423 72-1423 1 No Effect1427 72-1427 2 No Effect

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 4SB LIST Apr 02/2004

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1429 72-1429 2 No Effect1430 72-1430 4 No Effect1431 72-1431 1 No Effect1439 72-1439 2 Jun 01/891441 72-1441 2 No Effect1447 72-1447 2 No Effect1457 72-1457 1 No Effect1465 72-1465 1 No Effect1466 72-1465 Orig. No Effect1470 72-1470 2 No Effect1474 72-1474 Orig. No Effect1476 72-1476 Orig. No Effect1478 72-1478 Orig. No Effect1479 72-1479 1 No Effect1481 72-1481 1 No Effect1484 72-1484 1 No Effect1485 72-1485 Orig. No Effect1486 72-1486 Orig. No Effect1487 72-1487 1 No Effect1488 72-1488 Orig. No Effect1489 72-1489 Orig. No Effect1490 72-1490 Orig. No Effect1492 72-1492 1 No Effect1493 72-1493 Orig. No Effect1498 72-1498 Orig. No Effect1501 72-1501 Orig. No Effect1503 72-1503 Orig. Feb 27/981506 72-1506 1 No Effect1508 72-1508 Orig. No Effect1509 72-1509 Orig. No Effect1518 72-1518 Orig. No Effect1522 72-1522 Orig. No Effect1524 72-1524 Orig. No Effect1527 72-1527 Orig. No Effect1534 72-1534 3 No Effect1541 72-1541 Orig. No Effect1544 72-1544 1 No Effect1553 72-1553 Orig. No Effect1554 72-1554 Orig. No Effect1561 72-1561 2 No Effect1563 72-1563 Orig. No Effect1564 72-1564 3 No Effect1567 72-1567 2 No Effect1568 72-1568 2 No Effect

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 5SB LIST Apr 02/2004

P&WCSB No.

ATASB No. Rev. No. Engine Model Applicability

Effect/DateIncorporated

1571 72-1571 2 No Effect1578 72-1578 1 No Effect1587 72-1587 Orig. No Effect1597 72-1597 Orig. No Effect1598 72-1598 1 No Effect1599 72-1599 Orig. No Effect1606 72-1606 Orig. No Effect1610 72-1610 2 No Effect1614 72-1614 Orig. No Effect1803 72-1803 Orig. PT6A-20/-20A/-20B See NOTE

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 6SB LIST Apr 02/2004

TITLE PAGE

REVISION HIGHLIGHTS

RECORD OF REVISIONS

RECORD OF ADVANCE REVISIONS

PART/SECTION LIST

ADVANCE REVISION INDEX

SERVICE BULLETIN LIST

TABLE OF CONTENTSSUBJECT PAGE

PRATT & WHITNEY CANADAMAINTENANCE MANUAL

MANUAL PART NO. 3015442

Page 1/2FRONT CONTENTS Jan 05/2007