# BULLETIN INDEX LOCATOR 

# 73-20-00

TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF MODEL APPLICATION PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36, PT6A-114, PT6A-135, PT6A-135A Model(s) deleted this revision: PT6A-116 Compliance: CATEGORY 4 Summary: The existing power turbine containment ring is modified by installing a reinforcement liner. 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Cover Sheet

24-Hour Global Service USA & CANADA........................ **1-800-268-8000** Other .......................................... **1-450-647-8000** 

### CFIRST CENTRE International .................... **(IAC*)+8000-268-8000** Fax ............................................. **1-450-647-2888** Toll free where available (SIL GEN-027) * International Access Code Web Site .................................. **www.pwc.ca**WARNING - PROPRIETARY RIGHTS & EXPORT CONTROLS NOTICE This bulletin contains proprietary information of Pratt & Whitney Canada Corp. (′′P&WC′′), which P&WC provides in confidence and solely for the purposes of supporting engine certification and providing applicable information regarding the proper use, maintenance, inspection, repair, servicing and parts application of P&WC products and services, as directed therein. Neither this bulletin nor any information in it may be disclosed to others, or used for any other purpose, including, without limitation, to design, create, develop, reproduce, manufacture or derive any design, part, product, material, process, modification, configuration change or repair, or obtain FAA or other government approval to do so. Possession and use of this bulletin is also subject to the restrictions set out in P&WC’s Technical Data Agreement (a copy of which may be obtained by contacting P&WC Technical Publications). The contents of this bulletin may be subject to export control laws. Unauthorized export or re-export of the bulletin, or parts thereof, is prohibited. By accepting and possessing this bulletin, you agree to be bound by the foregoing terms. If a Government agency or department intends to disclose any information, written notice should be given to: VP - Legal Services, Pratt & Whitney Canada Corp., 1000 Marie-Victorin (01BE5), Longueuil, Quebec J4G 1A1.

**Export Control Classification** *Data is subject to the jurisdiction of the Export and Import Controls Bureau of the Department of Foreign Affairs and International Trade of Canada, Department of Commerce of the United States and/or Department of State of the United States. ** Data is not subject to the jurisdiction of the Department of Commerce of the United States or Department of State of the United States but would become subject if exposed to any US involvement. **Regulation Classification Number**  Canadian ECL(s)* ECCN(s)* P-ECCN(s)** 9E991 USML (ITAR)* P-USML**REVISION TRANSMITTAL SHEET TURBOPROP ENGINE MODEL PT6A

SUBJECT: Pratt & Whitney Canada Service Bulletin No. PT6A-72-A1427, Rev. No. 3, dated Jan 27/2012 (P&WC S.B. No. A1427R3) POWER TURBINE CONTAINMENT RING MODIFICATION OF

Replace your existing copy of this service bulletin with the attached revised bulletin. Destroy the superseded copy.

Please retain this Revision Transmittal Sheet with the revised bulletin.
SUMMARY: This service bulletin is revised to modify the compliance code and add alert.

EFFECT OF REVISION ON PRIOR ACCOMPLISHMENT: None.
NOTE: A black bar in the left margin indicates a change in that line of text or figure.

REVISION HISTORY: Original Issue: Feb 03/1988 Revision No. 1: Feb 23/1989 Revision No. 2: Apr 03/1990 Revision No. 3: Jan 27/2012 Pratt & Whitney Canada Corp. 1000, Marie-Victorin Longueuil, Québec, Canada J4G 1A1 Tél. 450-677-9411

27 January 2012
P&WC S.B. No. A1427R31. Planning Information A. Effectivity PT6A-20 Engines and all engines converted to Engine Model PT6A-20 (Ref. P&WC engine conversion SB1267). PT6A-20A Engines and all engines converted to Engine Model PT6A-20A (Ref. P&WC engine conversion SB1268). PT6A-20B Engines and all engines converted to Engine Model PT6A-20B (Ref. P&WC engine conversion SB1206). PT6A-21 Engines which are before and include Serial No. PCE-PCE-25361. PT6A-25 Engines. PT6A-25A Engines which are before and include Serial No. PCE-48757. PT6A-25C Engines which are before and include Serial No. PCE-26258. PT6A-27 Engines which are before and include Serial No. PCE-42523 and all engines converted to Engine Model PT6A-27 (Ref. P&WC engine conversion SB1214). PT6A-28 Engines and all engines converted to Engine Model PT6A-28 (Ref. P&WC engine conversion SB1120). PT6A-34 Engines which are before and include Serial No. PCE-57303 and all engines converted to Engine Model PT6A-34 (Ref. P&WC engine conversion SB1499). PT6A-34AG Engines which are before and include Serial No. PCE-57312 and all engines converted to Engine Model PT6A-34AG (Ref. P&WC engine conversion SB1252). PT6A-34B Engines. PT6A-36 Engines and all engines converted to Engine Model PT6A-36 (Ref. P&WC engine conversion SB1405). PT6A-114 Engines which are before and include Serial No. PCE-17218 excluding 17213. PT6A-135 Engines. PT6A-135A Engines which are before and include Serial No. PCE-35089. B. Concurrent Requirements None. C. Reason The existing power turbine containment ring is modified by installing a reinforcement liner. NOTE: Also some containment rings are modified to add scallops. D. Description The existing power turbine containment ring is modified by installing a reinforcement liner, also some are modified to add scallops. P&WC No. 35558, DCR 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 1 of 7 © 1988 Pratt & Whitney Canada Corp. PRINTED IN CANADA TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF1. Planning Information (Cont’d) E. Compliance CATEGORY 4 - P&WC recommends to do this service bulletin the first time the engine or module is at a maintenance base that can do the procedures, regardless of the scheduled maintenance action or reason for engine removal. F. Approval D.O.T./D.A.A. approved. G. Manpower Estimate of 1 man-hours required to include this service bulletin at overhaul. H. Weight and Balance None. I. Electrical Load Data Not changed. J. Software Accomplishment Summary Not applicable. K. References Illustrated Parts Catalog P/N 3015444 (PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B) Illustrated Parts Catalog P/N 3013244 (PT6A-21, PT6A-27, PT6A-28) Illustrated Parts Catalog P/N 3027544 (PT6A-25, PT6A-25A) Illustrated Parts Catalog P/N 3032144 (PT6A-25C) Illustrated Parts Catalog P/N 3021244 (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36) Illustrated Parts Catalog P/N 3043514 (PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) Overhaul Manual P/N 3011403 (PT6A-20, PT6A-20A, PT6A-20B) Overhaul Manual P/N 3013243 (PT6A-21, PT6A-27, PT6A-28) Overhaul Manual P/N 3027543 (PT6A-25, PT6A-25A) Overhaul Manual P/N 3032143 (PT6A-25C) Overhaul Manual P/N 3021243 (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-35, PT6A-36, PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) Part Digest No. 2992 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 2 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF1. Planning Information (Cont’d) L. Publications Affected Illustrated Parts Catalog P/N 3015444 (PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B) Illustrated Parts Catalog P/N 3013244 (PT6A-21, PT6A-27, PT6A-28) Illustrated Parts Catalog P/N 3027544 (PT6A-25, PT6A-25A) Illustrated Parts Catalog P/N 3032144 (PT6A-25C) Illustrated Parts Catalog P/N 3021244 (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36) Illustrated Parts Catalog P/N 3043514 (PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) M. Interchangeability and Intermixability of Parts Interchangeability - Refer to Para. 2.C. Intermixability - Not changed. 2. Material Information A. Industry Support Information Not applicable. B. Material - Cost and Availability You can get the procurable parts listed in Para. 2.C. from any Pratt & Whitney Canada Parts Distribution Center. The estimated total cost of new parts needed to replace old parts is $Quote (US, 2011). The new parts are available. C. Material Necessary for Each Engine The quantity of materials listed in this section is on a per Engine basis.

New P/N Keyword Old P/N Qty Est. Unit List Price

($US, 2011) Instructions Disposition 3109595-01 Ring Assembly, Containmnet, Power Turbine 3022339 1 (A)(B)

3109594-01 Ê Liner, Reinforcement 1 Quote (C) 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 3 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OFNew P/N Keyword Old P/N Qty Est. Unit List Price

($US, 2011) Instructions Disposition (A) ONE WAY INTERCHANGEABLE - (ATA 200 Explanation Code 01): The old part can only replace the old part; the new part can replace the old and the new part. (B) To get the new part it is possible to make a modification to the old part, or you can get the new part from any Pratt & Whitney Canada Distribution Center. (C) NOT INTERCHANGEABLE - (ATA 200 Explanation Code 03): The old part must replace the old part; the new part must replace new part.
D. Reidentified Parts The following list of parts can be reworked: OLD P/N NEW P/N 3022339 3109595-01 E. Tooling - Price and Availability Not applicable. 3. Accomplishment Instructions A. At engine disassembly, remove from engine existing power turbine containment ring P/N 3022339 in accordance with overhaul manual instructions. B. Existing serviceable containment ring P/N 3022339 can be reworked and reidentified as follows: (1) Install reinforcement liner P/N 3109594-01 into the power turbine containment ring (Ref. Fig. 1). (2) Using a suitable clamping device, clamp at least twelve positions to minimize gap between liner outside diameter and ring inside diameter during welding. (3) Weld liner using filler wire AMS 5679 or 5675 and T.I.G. method of welding (Ref. Fig. 1, View B B). (4) For containment ring P/N 3022339 prior change letter H, modify as follows (Ref. Fig. 2) (a) Machine scallops (5) (b) Break all sharp edges. 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 4 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF**0.050 NO WELD** 

**0.030 A** 
**0.700 MAX. OVERLAPPING** 
**P/N 3022339 (PRE−SB) P/N 3109595 (POST−SB)** 

**SLEEVE P/N 3109594−01**  **0.070 MIN.**  **0.125 MIN.** 

**SECTION** 

## A−A **VIEW** 

## B

**B A** 

**A** D C **0.050 NO WELD** 

**(POST−SB)**

C193066 Rework and reidentification of Power Turbine Containment Ring Figure 1 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 5 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF**0.117 OFFSET HOLE** 

**0.053 MIN.** 

**30 35**  **47**
**10.480 10.460**  **DIA 0.270**  **0.250**

**0.160 0.140**  **0.405 0.375**  **R 8** 

**70 45** 
**0.160 0.140**  **4 PLACES 0.405**  **0.375 R**  **4 PLACES** °

° °

°

° ° D

− −

C193067 Rework and reidentification of Power Turbine Containment Ring Figure 2 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 6 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF3. Accomplishment Instructions (Cont’d) (5) Fluorescent penetrant inspect weld per SPOP 62. **WARNING:** USE EYE PROTECTION WHEN YOU WRITE WITH THE VIBRATION PEENING PROCEDURE. (6) Put a line across the old part number. Use the vibration peening procedure, 0.003 to 0.006 in. (0.08-0.15 mm) deep, and write the new part number (Ref. Para. 2D) in the same area. C. Existing serviceable containment ring P/N 3109595-01 (Previously modified by SB 1427) not incorporating scallops (5) are to be modified as follows (Ref. Fig. 2) (1) Machine scallops (5) (2) Break all sharp edges. (3) Fluorescent penetrant inspect per SPOP 62. D. At engine assembly, install on engine new or reworked power turbine containment ring assembly P/N 3109595-01 in accordance with overhaul manual instructions E. Write accomplishment of P&WC S.B. No. 1427 in the applicable engine module log book. 4. Appendix Not applicable. 

### PRATT & WHITNEY CANADA 

# ALERT SERVICE BULLETIN
P&WC S.B. No. A1427R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator The export control classification with respect to this document is contained on the back of the locator. Feb 03/1988 **PT6A-72-A1427** Revision No. 3: Jan 27/2012 Page 7 of 7 TURBOPROP ENGINE POWER TURBINE CONTAINMENT RING MODIFICATION OF