# 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 BULLETINP&WC S.B. No. 41056R5

Apr 01/2011 **PT6C-72-41056** Revision No. 5: Jan 17/2013 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 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. 41056R51. 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 BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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 OF1. 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **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 OF1. 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 BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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 OFC. 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **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 OFNew 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 BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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 OFNew 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **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 OFOLD 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 BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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**  **M D**  **E**

**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 M**  **D E**  **M F**  **(REF.) F**  **− −**

**E − −**  **D − −** 

**2 HOLES AT LOC B**  **B**

**A A**  **M F** 

°

° °

° 

### 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 

### 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **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 OF3. 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 

# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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 OF3. 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **PT6C-72-41056** 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 

# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **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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# SERVICE BULLETIN P&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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**°

M M 0.040 IN. A D M K T

BC **(7.061−7.315 mm)**

C194554 Modification of the Existing Turbine Exhaust Duct Figure 3 (Sheet 2) 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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

− −

R

**PART**

S S 0.040 IN.

− D 0.040 S E **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) 

### 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 The export control classification with respect to this document is contained on the back of the locator. Apr 01/2011 **PT6C-72-41056** 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 OF3. 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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# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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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# SERVICE BULLETIN P&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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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# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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 OF4. 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 (0.076T) (0.025T) Housing Power Turbine 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 (2.413) (2.769) Duct Turbine Exhaust, 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) Radial Gap Disk Power Turbine **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 (0.114T) (0.038T) Cover Power Turbine Shaft Housing, Assy Of 5.3295 (135.369) 5.3315 (135.420) 

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# SERVICE BULLETIN P&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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 OF4. 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 (0.102L) (0.152L) Cover Power Turbine Shaft Housing, Assy Of 3.9810 (101.117) 3.9820 (101.143) **Post-SB41056** 1779 Duct Exhaust 0.1680L 0.2760L (4.267L) (7.010L) Cover Power Turbine Shaft Housing, Assy Of **Post-SB41056** 1780 Cover Power Turbine Shaft Housing Assy Of 0.0540L 0.1190L (1.372L) (3.023L) Radial Gap Blade Power Turbine B. Refer to Figure 5 for the Turbine Exhaust Duct part progression. 

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# SERVICE BULLETINP&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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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# SERVICE BULLETIN P&WC S.B. No. 41056R5

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. Apr 01/2011 **PT6C-72-41056** 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