BULLETIN INDEX LOCATOR

72-50-05

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF

MODEL APPLICATION

PT6C-67C

Commercial Support Program No: 1005964

Compliance: 3, 3, 3

Summary: A baffle located on the Power Turbine (PT) shaft housing cover may move out of

position and contact the downstream side of the second stage PT disk. This is

because a retaining ring holding the Power Turbine (PT) baffle in place may become

loose. An initial and recurring borescope inspection is required to confirm if the

retaining ring and the PT baffle are correctly in place.

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

Aug 12/2011 PT6C-72-A41060

Revision No. 3: Oct 11/2012 Cover Sheet

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

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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

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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

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Regulation Classification

Number

Canadian ECL(s)*

ECCN(s)*

P-ECCN(s)** 9E991

USML (ITAR)*

P-USML**
REVISION TRANSMITTAL SHEET

TURBOSHAFT ENGINE MODEL PT6C

SUBJECT: Pratt & Whitney Canada Service Bulletin No. PT6C-72-A41060, Rev. No. 3, dated Oct

11/2012 (P&WC S.B. No. A41060R3) RETAINING RING, POWER TURBINE BAFFLE -

INSPECTION 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 revision is issued to:

v delete the Note in para. 1E that stated ‘‘For engines that are past the above

interval....’’, and

v change the format of the compliance code shown on the title page from Compliance:

CATEGORY 3 TO Compliance 3, 3, 3.

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: Aug 12/2011

Revision No. 1: Sep 29/2011

Revision No. 2: Feb 10/2012

Revision No. 3: Oct 11/2012

Pratt & Whitney Canada Corp.

1000, Marie-Victorin

Longueuil, Québec, Canada J4G 1A1

Tél. 450-677-9411

11 October 2012

P&WC S.B. No. A41060R3

1. Planning Information

A. Effectivity

PT6C-67C Engines Pre-SB41056.

NOTE: 1. Engines that were shipped from a P&WC Service Center after June 15/2011

are already compliant for the first inspection of this Service Bulletin but they

must comply with the repetitive inspection requirement.

NOTE: 2. Engines that had Special Instruction 45-2011 accomplished are already

compliant for the first inspection of this Service Bulletin but they must comply

with the repetitive inspection requirement.

NOTE: 3. The repetitive inspections per SB A41059 are no longer required after

embodiment of this SB.

NOTE: 4. Engines Serial Number KB0562, KB0850 and KB0856 are already compliant

for the first inspection of this Service Bulletin but they must comply with the

repetitive inspection requirement.

B. Concurrent Requirements

None.

C. Reason

(1) Problem

A baffle located on the Power Turbine (PT) shaft housing cover may move out of

position and contact the downstream side of the second stage PT disk.

(2) Cause

A retaining ring holding the Power Turbine (PT) baffle in place may become loose.

(3) Solution

Do an initial and recurring borescope inspection to confirm that the PT baffle and

the retaining ring are correctly in place.

D. Description

Do a borescope inspection to confirm if the retaining ring and the PT baflle are correctly

installed. This SB must be performed under the direct supervision of a trained P&WC

representative or by personnel that have received specific training for this inspection.

P&WC No. DCR13892, DCR17606

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 1 of 14 © 2011 Pratt & Whitney Canada Corp.

PRINTED IN CANADA

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
1. Planning Information (Cont’d)

E. Compliance

For engines with more than 2000 PT cycles:

CATEGORY 3 - P&WC recommends to do this SB within 100 flight hours or 150 PT

cycles whichever comes first and recurring inspections every 600 flight

hours or 900 PT cycles whichever comes first.

For engines between 1000 and 2000 PT cycles:

CATEGORY 3 - P&WC recommends to do this SB within 250 flight hours or 350 PT

cycles whichever comes first and recurring inspections every 600 flight

hours or 900 PT cycles whichever comes first.

For engines with less than 1000 PT cycles:

CATEGORY 3 - P&WC recommends to do this SB within 500 flight hours or 750 PT

cycles whichever comes first and recurring inspections every 600 flight

hours or 900 PT cycles whichever comes first.

NOTE: 1. The PT cycles equals Current Cycles on the Second Stage PT disk.

NOTE: 2. For engines that are already compliant with the first inspection of this service

bulletin based on the note in para. 1.A. (Effectivity), the flight hours and PT

cycles to be considered for the first inspection are the ones from the last shop

visit.

F. Approval

D.A.A. approved

G. Manpower

Once you have access to the part, an estimate of 1.0 man-hours is required to include

this service bulletin at maintenance.

H. Weight and Balance

None.

I. Electrical Load Data

Not changed.

J. Software Accomplishment Summary

Not applicable.

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 2 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
1. Planning Information (Cont’d)

K. References

None.

L. Publications Affected

None.

M. Interchangeability and Intermixability of Parts

Interchangeability - Refer to Para. 2.C.

Intermixability - Not changed.

2. Material Information

A. Industry Support Information

Refer to Commercial Support Program Notification (CSPN) No. 1005964.

Refer to SIL PT6C-012 to schedule a visit of a P&WC representative or MRT.

B. Material - Cost and Availability

Not applicable.

C. Material Necessary for Each Engine

Not applicable.

D. Reidentified Parts

None.

E. Tooling - Price and Availability

Tool No. Nomenclature

Est. Price

($US,) Delivery

None Fiberscope with

1.0 mm fiber diameter

or less and a

minimum of 600 mm

in length (Ref. Fig.

1).

NA Commercially

Available

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 3 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
2. Material Information (Cont’d)

Tool No. Nomenclature

Est. Price

($US,) Delivery

None Guide and Pointer

Tool (Ref. Fig. 1

and 4).

NA Provided by

P&WC

3. Accomplishment Instructions

WARNING: ENGINE MUST BE COOL PRIOR TO DOING THIS PROCEDURE.

CAUTION: THIS PROCEDURE MUST BE PERFORMED UNDER THE DIRECT

SUPERVISION OF A TRAINED P&WC REPRESENTATIVE OR BY

PERSONNEL THAT HAVE RECEIVED SPECIFIC TRAINING FOR THIS

INSPECTION.

CAUTION: THE BORESCOPE IS FRAGILE. HANDLE WITH CARE TO AVOID DAMAGE

AND DO NOT BEND EXCESSIVELY.

CAUTION: DO NOT ROTATE THE POWER TURBINE WHILE DOING THIS PROCEDURE.

IF THE ENGINE IS INSTALLED, DO NOT ROTATE THE MAIN OR TAIL

ROTOR.

A. Do the borescope inspection as follows:

(1) For installed engines or engines ready to be installed on the airframe, the airframe

primary exhaust nozzle bolted to the engine exhaust port flange must be removed

(Ref. Fig. 2). Refer to the airframe maintenance manual.

(2) Gain access to the engine exhaust port (Ref. Fig. 3).

(3) Insert the pointer tool between the platforms of the 2nd stage PT blades and the

exhaust hub at TDC position. Make sure the tip of the pointer tool is pointing

toward the center of the engine. Apply tape over the pointer tool to prevent it from

moving.

NOTE: Contact P&WC if the pointer tool cannot be inserted properly. It might be

because the PT baffle ass’y has moved out of position.

(4) Insert the borescope fiber and manoeuver the fiber in the cavity between the 2nd

stage PT disk and the baffle to locate the retaining ring.

(5) Verify that the retaining ring is in position.

(6) Repeat above steps at approximatly 135 deg from TDC (on more accessible side).

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 4 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
3. Accomplishment Instructions (Cont’d)

(7) If the retaining ring is missing or the PT Baffle out of position, return the engine to

P&WC.

(8) Complete the Inspection Form (Ref. Fig. 9) attached and send it by E-mail or Fax

to:

v E-mail: GP.PWC.PT6.Series.Turboshaft.SE@pwc.ca

v Fax: 450-647-9597

B. Write accomplishment of P&WC S.B. No. 41060 in the applicable engine module log

book.

4. Appendix

PRATT & WHITNEY CANADA

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P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 5 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
C194090

Fiberscope with guide tool installed

Figure 1

PRATT & WHITNEY CANADA

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P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 6 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
AIRFRAME PRIMARY

EXHAUST NOZZLE

C184820

Primary Exhaust Nozzle

Figure 2

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 7 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
C185421

Engine Exhaust Port

Figure 3

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 8 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
C194092

Second Stage PT Blades and Exhaust Hub

Figure 4

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 9 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
INSERT FIBER HERE

EXHAUST HUB

COVER

P/N 3070467−01

RETAINING RING

P/N AS3217−215

BAFFLE

P/N 3070555−01

C184823

Retaining Ring Location - Engines Pre-SB41056

Figure 5

PRATT & WHITNEY CANADA

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P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 10 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
C194093

Retaining Ring Installed - Engines Pre-SB41056

Figure 6

PRATT & WHITNEY CANADA

ALERT SERVICE BULLETIN

P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 11 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
BAFFLE

P/N 3070555−01

RETAINING RING

P/N AS3217−215

RETAINING RING IN PLACE

RETAINING RING REMOVED

BAFFLE

P/N 3070555−01

C194094

Retaining Ring Missing - Engines Pre-SB41056

Figure 7

PRATT & WHITNEY CANADA

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P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 12 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
POINTER TOOL

COVER

RETAINING RING

PT DISK

PT BAFFLE LIP

RETAINING RING IN PLACE

RETAINING RING MISSING

(SIMULATED BORESCOPE VIEW)

DISLODGED PT BAFFLE

POINTER TOOL

COVER

PT BAFFLE LIP

COVER

PT DISK

C194095

PT Baffle

Figure 8

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P&WC S.B. No. A41060R3

P&WC Proprietary Information. Subject to the restrictions on the back of the locator

Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 13 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF
INSPECTION FORM

ENGINE S/N:

ENGINE TSN:

AIRCRAFT S/N (IF INSTALLED):

ENGINE POSITION (IF INSTALLED):

INSPECTION DATE:

INSPECTION LOCATION:

INSPECTION PERFORMED BY:

P&WC FSR INVOLVED:

RETAINING RING IN PLACE: YES NO

COMPANY NAME:

Complete the Inspection Form and send it by E−mail or Fax to:

E−mail: GP.PWC.PT6.Series.Turboshaft.SE@pwc.ca

FAX: 450−647−9597

OPERATOR /OWNER NAME:

SECOND STAGE PT DISK CYCLES:

C188086

Inspection Form

Figure 9

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Aug 12/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-A41060

Revision No. 3: Oct 11/2012 Page 14 of 14

TURBOSHAFT ENGINE

RETAINING RING, POWER TURBINE BAFFLE - INSPECTION OF