BULLETIN INDEX LOCATOR

72-50-04 / 72-50-05 / 72-50-06

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF

MODEL APPLICATION

PT6C-67C

Compliance: 4

Summary: Some operators may experience carbon formation in the oil system under hot

ambient conditions. Engine heat management can be further improved in hot ambient

conditions by introducing improved insulation in the number 3 bearing area. There

is a requirement to provide one type of turbine exhaust duct. Introduce a new turbine

exhaust duct which incorporates five additional holes to the flange to accommodate

the angular positioning and the new power turbine housing configuration. For engines

Pre-SB41045, the Housing Assembly for the No. 5 Bearing Support must also be

modified. An improved fit between the Power Turbine (PT) baffle assembly and the PT

housing cover is introduced, along with a retaining ring made from a different

material.

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

Apr 01/2011 PT6C-72-41056

Revision No. 5: Jan 17/2013 Cover Sheet

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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

TURBOSHAFT ENGINE MODEL PT6C

SUBJECT: Pratt & Whitney Canada Service Bulletin No. PT6C-72-41056, Rev. No. 5, dated Jan

17/2013 (P&WC S.B. No. 41056R5) POWER TURBINE SHAFT HOUSING ASSEMBLY,

NO.3 BEARING SEAL RUNNER AND TURBINE SHAFT SPACER, TURBINE

EXHAUST DUCT - REPLACEMENT/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: 1. This service bulletin is revised to clarify Concurrent Requirements, para. 1.B.

EFFECT OF REVISION ON PRIOR ACCOMPLISHMENT:

If P&WC S.B. 41050 was not incorporated prior to or in conjunction with this service bulletin,

incorporate P&WC S.B. 41050 at the next scheduled cleaning of the fuel nozzles.

NOTE: A black bar in the left margin indicates a change in that line of text or figure.

REVISION HISTORY:

Original Issue: Apr 01/2011

Revision No. 1: Jun 17/2011

Revision No. 2: Oct 06/2011

Revision No. 3: Feb 03/2012

Revision No. 4: Feb 13/2012

Revision No. 5: Jan 17/2013

Pratt & Whitney Canada Corp.

1000, Marie-Victorin

Longueuil, Québec, Canada J4G 1A1

Tél. 450-677-9411

17 January 2013

P&WC S.B. No. 41056R5

1. Planning Information

A. Effectivity

PT6C-67C Engines which are before and include Serial No. PCE-KB0868.

NOTE: The above effectivity list does not identify engines that have been converted

from one engine model to another via an engine conversion service bulletin. To

clarify the effectivity of converted engines, refer to the original engine

effectivity above. For the parts embodied during the engine conversion, refer to

conversion service bulletin.

B. Concurrent Requirements

P&WC S.B. 41050 (FUEL NOZZLE CONFIGURATION AND ECOLOGY SYSTEM

ACCUMULATOR - REPLACEMENT OF) must be incorporated prior to or in conjunction

with this service bulletin.

If P&WC S.B. 41050 was not incorporated prior to or in conjunction with this service

bulletin, incorporate P&WC S.B. 41050 at the next scheduled cleaning of the fuel nozzles.

C. Reason

(1) Problem

(a) Some operators may experience carbon formation in the oil system under hot

ambient conditions.

(b) There is a requirement to provide a common configuration exhaust duct flange

for some engine models.

(c) The retention feature for the PT baffle assembly can be improved.

(2) Cause

(a) Engine heat management can be further improved.

(b) Some applications have different angular positioning requirements.

(c) The fit between the PT baffle assembly and the PT housing cover and the

material of the retaining ring may not be optimal for all operating conditions.

(3) Solution

(a) Introduce improved insulation in No.3 bearing area.

(b) Introduce a new turbine exhaust duct which incorporates 5 additional holes to

the flange and also accommodates the new power turbine housing configuration.

P&WC No. D8398A, E0621D, D5220A, E0621N, D5220A1, E5220B, E0621P, DCR20983

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 1 of 20 © 2011 Pratt & Whitney Canada Corp.

PRINTED IN CANADA

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
1. Planning Information (Cont’d)

(c) Improved fit between the PT baffle assembly and the PT housing cover and a

retaining ring made from a different material.

(d) For engines Pre-SB41045, introduce a modification to the Housing Assembly

for the No. 5 Bearing Support.

D. Description

(1) Replace the existing power turbine shaft housing cover, No. 3 bearing seal runner

and turbine shaft spacer with new ones to prevent carbon formation in the oil

system under hot ambient conditions. Replace the existing turbine exhaust duct

with a new or modified one that is common and has an additional five holes to the

flange to accommodate the angular positioning and the new power turbine

housing. For engines Pre-SB41045, modify the Housing Assembly for the No. 5

Bearing Support.

(2) An improved fit is introduced between the PT baffle assembly and the PT housing

cover and a new retaining ring made from a different material is introduced.

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

No more man-hours are necessary to include this service bulletin at overhaul.

H. Weight and Balance

The engine weight will increase by 0.18 pounds (0.08 kgs).

The effect of weight change on the center of gravity is negligible.

I. Electrical Load Data

Not changed.

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 2 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
1. Planning Information (Cont’d)

J. Software Accomplishment Summary

Not applicable.

K. References

Illustrated Parts Catalog P/N 3045334 (PT6C-67C)

Overhaul Manual P/N 3045333 (PT6C-67C)

PWA Overhaul Standard Practices Manual P/N 585005

L. Publications Affected

Illustrated Parts Catalog P/N 3045334 (PT6C-67C)

Overhaul Manual P/N 3045333 (PT6C-67C)

M. Interchangeability and Intermixability of Parts

Interchangeability - Refer to Para. 2.C.

Intermixability - Not changed.

2. Material Information

A. Industry Support Information

A Commercial Support Program Notification is in preparation and will be released at a

later date.

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, 2012).

The new parts are scheduled to be available in Feb 2012.

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 3 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
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,

2012)

Instructions

Disposition

3074267-01 Runner, Seal No. 3 Bearing 3055992-01 1 7313.80 (A)(B)

3073997CL Spacer, Turbine Shaft 3072596CL 1 1090.20 (A)(B)

3073997CL21 Ê Spacer, 0.430 - 0.440 in. 3072596CL21 AR

3073997CL23 Ê Spacer, 0.440 - 0.450 in. 3072596CL23 AR

3073997CL25 Ê Spacer, 0.450 - 0.460 in. 3072596CL25 AR

3073997CL27 Ê Spacer, 0.460 - 0.470 in. 3072596CL27 AR

3073997CL29 Ê Spacer, 0.470 - 0.480 in. 3072596CL29 AR

3073997CL31 Ê Spacer, 0.480 - 0.490 in. 3072596CL31 AR

3073997CL33 Ê Spacer, 0.490 - 0.500 in. 3072596CL33 AR

3073997CL35 Ê Spacer, 0.500 - 0.510 in. 3072596CL35 AR

3073997CL37 Ê Spacer, 0.510 - 0.520 in. 3072596CL37 AR

3075588-01 Housing Assy, Power

Turbine Shaft

3059419-01 1 33594.00 (A)(B)

3073987-01 Ê Flange, Power Turbine

Shaft Housing

3057390-01 1 NP

ST3287-01 Ê Insert, Flange Jacking ST3287-01 5 78.07 (A)(B)

Ê Nut Option (IC) ST3321-01 2 (A)(B)

ST6059-03 Ê Nut, Self Locking, Clinch,

0.190-32UNJF

2 97.90 (A)

Ê Nut Option (IC) ST3321-01 2 (A)(B)

ST6059-03 Ê Nut, Self Locking, Clinch,

0.190-32UNJF

2 97.40 (A)

3073074-01 Cover Assy, Power Turbine

Shaft Hsg

3070467-01 1 18690.00 (A)(C)

MS9489-07 Bolt, Mach, 0.190-32J X

0.562, HEX

MS9489-06 6 1.99 (A)(B)

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 4 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
New P/N Keyword Old P/N Qty

Est. Unit

List Price

($US,

2012)

Instructions

Disposition

Washer, Key, 0.210 X 0.022

THK

ST3371-01 (A)(B)

ST6345-01 Washer, Key, Triple 2 106.00 (A)

Baffle Assy, Housing, Power

Turbine

3070555-01 (A)(C)

Ê Rivet, Solid, 0.0620 X

0.281, UNIV

AN123310 (A)(C)

3073037-01 Baffle, Power Turbine

Housing

1 5973.80 (A)

Gasket Option (IC) ST3477-67 (A)(C)

3073839-01 Insulation Blanket Assy, Pwr

Sect

3070325-01 1 7156.40 (A)(B)

3073840-01 Ê Insulation Blanket, Power

Section

3070462-01 1 NP

3073073-01 Ê Cover, Insulation Blanket 3070463-01 1 NP

3073085-01 Shield Assy, Insulation 1 1907.10 (A)

3073088-01 Ê Ring, Mounting, Insulation

Shield

1 NP (A)

3073083-01 Ê Shield, Insulation 1 NP (A)

3075669-01 Seal, Carbon Controlled

Gap

3070370-01 1 4923.00 (A)(B)

ST3397-31 Ring, Retaining, 5.588 X

0.250 X 0.072

AS3217-215 1 764.60 (A)(B)

3076019-01 Duct Assy, Turbine Exhaust

Sgl Port

3071442-01 1 142842.00 (A)(B)

For engines Pre-SB41045

02R3057389-01 Housing Assy, No. 5

Bearing Support

3057389-01 1 RWK (A)(D)

For Field Engines Incorporating P&WC SB41024:

3075997-01 Duct, Turbine Exhaust Sgl

Port, Asyo

3071860-01 1 RWK (A)(D)

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 5 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
New P/N Keyword Old P/N Qty

Est. Unit

List Price

($US,

2012)

Instructions

Disposition

For Field Engines Incorporating P&WC SB41011:

01R3070489-01 Duct, Turbine Exhaust Sgl

Port, Asyo

3070489-01 1 RWK (A)(D)

For Field Engines Incorporating P&WC SPB18:

3076019-01 Duct, Turbine Exhaust Sgl

Port, Asyo

3071442-01 1 RWK (A)(D)

For Field Engines Incorporating P&WC SB41011:

01R3070540-01 Duct, Turbine Exhaust Sgl

Port, Asyo

3070540-01 1 RWK (A)(D)

For Field Engines Incorporating P&WC SB41011:

01R3070541-01 Duct, Turbine Exhaust Sgl

Port, Asyo

3070541-01 1 RWK (A)(D)

For Field Engines Incorporating P&WC SB41011:

05R3057384-01 Duct, Turbine Exhaust Sgl

Port, Asyo

01R3057384-01 1 RWK (A)(D)

Parts Required for Modification of Turbine Exhaust Duct Assembly:

3076836-01 Ring, Turbine Exhaust Duct

Inner

1 Quote (E)

(A) RESTRICTED INTERCHANGEABILITY - (ATA 200 Explanation Code 07):

All the old parts must be replaced by all the new parts as an assembly.

(B) Discard the part if it is unserviceable. Return a serviceable part to stock.

(C) Discard. Do not use again in any application.

(D) To get the new part it is necessary to make a modification to the old part.

(E) Parts required for modification of existing Turbine Exhaust Duct Assembly.

D. Reidentified Parts

The following list of parts can be reworked:

OLD P/N NEW P/N

P&WC P/N 3057389-01 P&WC P/N 02R3057389-01

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 6 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
OLD P/N NEW P/N

3071860-01 3075997-01

3070489-01 01R3070489-01

3071442-01 3076019-01

3070540-01 01R3070540-01

3070541-01 01R3070541-01

01R3057384-01 05R3057384-01

E. Tooling - Price and Availability

Not applicable.

3. Accomplishment Instructions

A. Remove the parts listed under Old P/N in Para. 2.C., Material Necessary for Each

Engine, in accordance with the overhaul manual instructions.

(1) Remove the single port turbine exhaust duct assembly P/N 3071442-01 or

P/N 3071860-01 or P/N 3070489-01 (Ref. 72-00-00 ENGINE - DISASSEMBLY-3:

MODULES AND MAJOR SUBASSEMBLIES).

(2) Remove the power turbine shaft housing assembly P/N 3059419-01 (Ref. 72-01-00

POWER SECTION - DISASSEMBLY).

(3) Remove the power section insulation blanket assembly P/N 3070325-01 (Ref.

72-50-05 EXHAUST DUCT AND INSULATION BLANKET - DISASSEMBLY).

(4) Remove retaining ring P/N AS3217-215, turbine baffle housing baffle

P/N 3070555-01, six bolts P/N MS9489-06, six key washers P/N ST3371-01, power

turbine shaft housing cover P/N 3070467-01, gasket P/N ST3477-67, and carbon

seal P/N 3070370-01 (Ref. 72-50-05 EXHAUST DUCT AND INSULATION BLANKET

- DISASSEMBLY).

(5) Remove No. 3 bearing seal runner P/N 3055992-01 and turbine shaft spacer

P/N 3072596 (Ref. 72-50-04 POWER TURBINE - DISASSEMBLY).

B. For engines Pre-SB41045, modify housing assembly P/N 3057389-01 as follows (Ref.

Fig. 1):

(1) Remove housing assembly P/N 3057389-01 (Ref. 72-50-06 POWER TURBINE

SHAFT HOUSING ASSEMBLY - DISASSEMBLY).

(2) Drill 4 holes as shown.

(3) Break edges 0.003 to 0.015 inches (0.08 to 0.38 mm).

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 7 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
C

0.010 IN.

(0.25 mm) M D E M

0.24975 − 0.25025 IN.

(6.34 − 6.36 mm)

(REF.)

INTERRUPTED SURFACE

12.340 − 12.344 IN.

(313.44 − 313.54 mm)

90

7 (REF.) 30

180

60

0.216 −0.226 IN.

(5.48 − 5.74 mm)

2 HOLES AT LOC

13.555 IN.

(344.30 mm)

0.325 − 0.335 IN.

(8.25 − 8.51 mm)

0.010 IN.

(0.25 mm) M D E M F M

(REF.)

− − F

− − E

− − D

2 HOLES AT LOC

B

B

A

A

F M

°

° °

°

A

A

°

A

B

SECTION A−A

RE−IDENTIFY HOUSING TO:

P/N 02R3057389−01

C188495

Housing Assembly, No. 5 Bearing Support - Modification

Figure 1

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SERVICE BULLETIN

P&WC S.B. No. 41056R5

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Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 8 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
3. Accomplishment Instructions (Cont’d)

CAUTION: MAKE SURE THAT THE REMAINING ELECTROLYTE (ETCH SOLUTION)

IS FULLY NEUTRAL AFTER YOU WRITE ON THE PART. ELECTROLYTE

CAN CAUSE CORROSION ON THE PART.

(4) Use the electrolyte etch procedure, 0.003 in. (0.08 mm) deep maximum and put a

line across the old part number. Write the new part number in the same area.

(5) Perform FPI on reworked surfaces per SPOP 62.

(6) Anodize bare surfaces per SPOP 42.

(7) Apply one coat primer and one coat epoxy enamel to drilled holes and if required to

Face C per SPOP 148.

(8) Install reworked housing assembly P/N 02R3057389-01 (Ref. 72-50-06 POWER

TURBINE SHAFT HOUSING ASSEMBLY - SUB-ASSEMBLY).

C. Install the parts listed under New P/N in Para. 2.C., Material Necessary for Each

Engine, in accordance with the overhaul manual instructions.

NOTE: 1. All other associated parts not shown in this Service Bulletin as replacement

parts must be assembled in accordance with the overhaul manual instructions.

NOTE: 2. Refer to Table 1 for the Fits and Clearances.

(1) Install power section insulation blanket P/N 3073839-01 to power turbine shaft

housing assembly P/N 3075588-01 (Ref. 72-50-05 EXHAUST DUCT AND

INSULATION BLANKET - SUB - ASSEMBLY).

(2) Install new single port turbine exhaust duct assembly P/N 3076019-01 on stand and

carefully install power turbine shaft housing assembly P/N 3075588-01 (Ref.

72-01-00 POWER SECTION - SUB - ASSEMBLY).

(3) Determined the correct turbine shaft spacer thickness and install P/N 3073997 (CL)

(Ref. 72-01-00 POWER SECTION - SUB - ASSEMBLY).

(4) Install carbon seal P/N 3075669-01 (Ref. 72-01-00 POWER SECTION - SUB -

ASSEMBLY).

(5) Install No. 3 bearing seal runner P/N 3074267-01 (Ref. 72-50-04 POWER TURBINE

- SUB - ASSEMBLY).

(6) Install new ceramic packing P/N 3070557-01 on power turbine housing cover

P/N 3073074-01 (Ref. 72-01-00 POWER SECTION - SUB - ASSEMBLY).

PRATT & WHITNEY CANADA

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P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 9 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
3. Accomplishment Instructions (Cont’d)

(7) Install power turbine housing cover P/N 3073074-01 (Ref. 72-01-00 POWER

SECTION - SUB - ASSEMBLY).

(8) Align the holes on the power turbine housing cover P/N 3073074-01 gently against

the power turbine shaft housing assembly P/N 3075588-01 (Ref. 72-01-00 POWER

SECTION - SUB - ASSEMBLY).

(9) Install two key washers P/N ST6345-01, install six bolts P/N MS9489-07 and torque

32 to 36 Ib.in. (3.6 - 4.1 Nm) (Ref. 72-01-00 POWER SECTION - SUB - ASSEMBLY).

NOTE: 1. Apply lubricating paste (Ref. PWC06-036+), on threads of bolts.

NOTE: 2. Lock key washers.

(10) Install insulation shield assembly P/N 3073085-01 (Ref. As shown in Fig. 2).

NOTE: Larger diameter faces rearward.

(11) Install power turbine housing baffle P/N 3073037-01 (Ref. 72-01-00 POWER

SECTION - SUB ASSEMBLY).

(12) Install retaining ring P/N ST3397-31 (Ref. 72-01-00 POWER SECTION - SUB

ASSEMBLY).

D. Write accomplishment of P&WC S.B. No. 41056 in the applicable engine module log

book.

E. Existing single port turbine exhaust assembly P/N 3071442-01, P/N 3071860-01,

P/N 3070489-01, P/N 3070540-01, P/N 3070541-01 and P/N 01R3057384-01 may be

modified and reidentified as follows (Ref. Fig. 3):

NOTE: New turbine exhaust duct ring inner P/N 3076836-01 is required to do this

modification.

(1) Machine above weld line to remove existing old part ‘‘R’’ (Ref. P/N 3071429-01).

(2) Machine part ‘‘N’’ to dimension ‘‘M’’ (Ref. 1.160 to 1.180 in (29.464 - 29.972 mm).

(3) Perform fluorescent penetrant inspection in accordance with SPOP 62 (Ref. Standard

Practices Manual).

(4) Prepare part ‘‘N’’ mating surface for weld.

(5) Tack weld new part ‘‘R’’ in accordance with PWA16.

(6) Check and adjust mismatch, form and position of part ‘‘R’’ prior to final welding.

PRATT & WHITNEY CANADA

SERVICE BULLETIN

P&WC S.B. No. 41056R5

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

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Revision No. 5: Jan 17/2013 Page 10 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
PACKING FIBER

P/N 3070557−01

RETAINING RING

P/N ST3397−31

BOLT MACH. HEX

P/N MS9489−07

(QTY. 6)

CARBON SEAL

P/N 3075669−01

BLANKET

P/N 3073839−01

HOUSING ASSEMBLY

POWER TURBINE SHAFT

P/N 3075588−01

BAFFLE HOUSING ASSEMBLY

P/N 3073037−01

KEY WASHER

P/N ST6345−01

(QTY. 2)

COVER

POWER TURBINE

SHAFT HOUSING

P/N 3073074−01

(REF.)

INSULATION SHIELD

P/N 3073085−01

C179553

Power Turbine Configuration Post SB41056

Figure 2

PRATT & WHITNEY CANADA

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P&WC S.B. No. 41056R5

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

Apr 01/2011 The export control classification with respect to this document is contained on the back of the locator. PT6C-72-41056

Revision No. 5: Jan 17/2013 Page 11 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
F

− − A

− − B

− − E

− − D

PART

(320.675)

(320.599)

REF.

AVG

P

PART R

AVG

PART N

M

B

B

A

REF.

BY ELECTROLITIC ETCH

(DEEP) OR LASER INTERMEDIATE

G H

10

CLASS B

A

D

C

1.170 IN.

(29.718 mm)

+/− 0.010 IN.

(0.254 mm)

12.625

12.622 IN.

mm

13.867−13.865 IN.

(352.222−352.171 mm)

TRIM HERE

SECTION D−D

VIEW C−C

− −K

− −B

IN.

(2.360)

(2.375) mm

0.0929

0.0935

(REF.)

D

C179572

Modification of the Existing Turbine Exhaust Duct

Figure 3 (Sheet 1 of 3)

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Revision No. 5: Jan 17/2013 Page 12 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
VIEW B−B

E

E

13.555

PART

5 HOLES

AT LOC

0.278−0.288 IN.

BC

BC

7

BC BC

BC

6

7 °

7 °

S

33 °

27 ° 23 °

0.040 IN. M A D M K M

T

BC

(7.061−7.315 mm)

C194554

Modification of the Existing Turbine Exhaust Duct

Figure 3 (Sheet 2)

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Revision No. 5: Jan 17/2013 Page 13 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
VIEW A

− −B

PART R

0.040 IN. S D S −

0.040

E S

×30 2 ° ° ±

0.040−0.060 IN.

CHAM

AVG

0.653−0.573 IN.

(16.586−14.554 mm)

2.195−2.175 IN.

(55.753−55.245 mm)

6.225−6.215 IN.

(158.115−157.861 mm)

(1.016−1.524 mm)

VIEW E−E

BE

MARK "6" AT LOC

AND "7" AT LOC 7

ORIENTED AS SHOWN BY

ARROW IN AREA BY

ELECTROLYTIC ETCH (DEEP)

OR LASER INTERMEDIATE

6

BE

7

C181045

Modification of the Existing Turbine Exhaust Duct

Figure 3 (Sheet 3)

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Revision No. 5: Jan 17/2013 Page 14 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
3. Accomplishment Instructions (Cont’d)

(7) Weld in accordance with PWA16 using filler material AMS5837 or PWC05-151.

Weld using minimum heat. No heat treatment is required after welding.

(8) Visually inspect weld area for any offset.

NOTE: Weld offset may be 50% of thickness for not more than 25% of the length

of the weld measured from the side shown flush.

(9) Perform fluorescent penetrant inspection in accordance with SPOP 62 (Ref.

Standard Practices Manual).

(10) Perform x-ray of the weld (Ref. Conventional radiographic inspection (Class B)), in

accordance with standard practices manual.

(11) Machine and inspect part ‘‘R’’ to the dimensions shown.

(12) Drill holes in part ‘‘S’’ at location ‘‘BC’’ shown (Ref. Five additional holes).

(13) Mark in accordance with electronic etch (Deep) or laser intermediate at location ‘‘6’’

and location ‘‘7’’ (Ref. View E-E) .

(14) Perform fluorescent penetrant inspection of the machined details and weld, in

accordance with SPOP 62 (Ref. Standard Practices Manual).

CAUTION: MAKE SURE THAT THE REMAINING ELECTROLYTE (ETCH SOLUTION)

IS FULLY NEUTRAL AFTER YOU WRITE ON THE PART. ELECTROLYTE

CAN CAUSE CORROSION ON THE PART.

(15) Put a line across the old part number. Use the electrolyte etch procedure, 0.002 in.

(0.05 mm) deep maximum, and write the new part number in the same general

area.

4. Appendix

A. Refer to Table 1 and Figure 4 for the Fits and Clearances.

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Revision No. 5: Jan 17/2013 Page 15 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
1710

1776

1777

1731

C179652

Fits and Clearance

Figure 4 (Sheet 1 of 2)

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Revision No. 5: Jan 17/2013 Page 16 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
1755

1764

1758

1779

1780

C179653

Fits and Clearance

Figure 4 (Sheet 2)

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Revision No. 5: Jan 17/2013 Page 17 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
4. Appendix (Cont’d)

TABLE 1, Fits and Clearance

Dim. for Ref.

inches (mm)

Limits

inches (mm) REF.

NO. IFR Name Min. Max. Min. Max. Replace

Post-SB41056

1710 Carbon Seal 3.1065

(78.905)

3.1075

(78.931) 0.0030T 0.0010T

Housing Power Turbine (0.076T) (0.025T)

Shaft, Assy Of

3.1045

(78.854)

3.1055

(78.880)

Post-SB41056

1731 Housing Power Turbine

Shaft, Assy Of

6.1160

(155.346)

6.1200

(155.448) 0.0950 0.1090

Duct Turbine Exhaust, (2.413) (2.769)

Assy Of, Inner Ring

6.2150

(157.861)

6.2250

(158.115)

Post-SB41056

1755 Disk Power Turbine 0.0830 0.1690

(2.108) (4.293)

Axial Gap Housing Power Turbine

Shaft, Assy Of

Post-SB41056

1758 Duct Exhaust 0.0550 0.2000

(1.397) (5.080) Disk Power Turbine Radial Gap

Post-SB41056

1764 Duct Exhaust

Disk Power Turbine

Dimension has to be

included between

0.030 (0.762)

and 0.100 (2.54)

Post-SB41056

1776 Baffle Power Turbine

Housing

5.3330

(135.458)

5.3340

(135.484) 0.0045T 0.0015T

Cover Power Turbine (0.114T) (0.038T)

Shaft Housing, Assy Of

5.3295

(135.369)

5.3315

(135.420)

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Revision No. 5: Jan 17/2013 Page 18 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
4. Appendix (Cont’d)

TABLE 1, Fits and Clearance (Cont’d)

Dim. for Ref.

inches (mm)

Limits

inches (mm) REF.

NO. IFR Name Min. Max. Min. Max. Replace

Post-SB41056

1777 Housing Power Turbine

Shaft, Assy Of

3.9860

(101.244)

3.9870

(101.270) 0.0040L 0.0060L

Cover Power Turbine (0.102L) (0.152L)

Shaft Housing, Assy Of

3.9810

(101.117)

3.9820

(101.143)

Post-SB41056

1779 Duct Exhaust

0.1680L 0.2760L

Cover Power Turbine (4.267L) (7.010L) Shaft Housing, Assy Of

Post-SB41056

1780 Cover Power Turbine

Shaft Housing Assy Of

0.0540L 0.1190L

(1.372L) (3.023L)

Blade Power Turbine Radial Gap

B. Refer to Figure 5 for the Turbine Exhaust Duct part progression.

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Revision No. 5: Jan 17/2013 Page 19 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF
3057384−01

BASIC

3070489−01

SB41011

Heat Transfer

CC 5 PRC 07

Reduction of

3071860−01

SB41024

Improved

CC 7 PRC 02

Manufacturing

3058638−01

SB41001

Timing Pin

CC 5 PRC 02

Replacement of

3070541−01

SB41011

3070540−01

SB41011

01R3057384−01

SB41011

3059761−01

SB41001

3071442−01

SPB18

To Ease

CC 9 PRC 02

Procurement

01R3070489−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

3075997−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

3076019−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

05R3057384−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

01R3070540−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

01R3070541−01

SB41056

Additional Holes

CC 5, 8 PRC 07

On Flange

C187006

Turbine Exhaust Duct - Part Progression

Figure 5

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Revision No. 5: Jan 17/2013 Page 20 of 20

TURBOSHAFT ENGINE

POWER TURBINE SHAFT HOUSING ASSEMBLY, NO.3 BEARING SEAL RUNNER AND

TURBINE SHAFT SPACER, TURBINE EXHAUST DUCT - REPLACEMENT/MODIFICATION OF