# BULLETIN INDEX LOCATOR 

# 72-10-00

TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF

MODEL APPLICATION PT6B-37A Commercial Support Program No: 1007180 Compliance: CATEGORY 3 Summary: The in-service life of the No. 9 & 10 bearings P/N 3310433-03 can be less than

expected. Replace bearing P/N 3310433-03 as required with bearing P/N 3310233-03 or P/N 3310533-03.



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

Feb 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 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.caWARNING - 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 PT6B

SUBJECT: Pratt & Whitney Canada Service Bulletin No. PT6B-72-39092, Rev. No. 4, dated Dec

29/2014 (P&WC S.B. No. 39092R4) NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT 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:

v change the reference to a one time inspection with replacement of bearing throughout the text, and

v move the list of affected engine serial numbers from Para. 1.A to Table 1.

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 12/2014 Revision No. 1: Aug 05/2014 Revision No. 2: Aug 08/2014 Revision No. 3: Oct 01/2014 Revision No. 4: Dec 29/2014 Pratt & Whitney Canada Corp. 1000, Marie-Victorin Longueuil, Québec, Canada J4G 1A1 Tél. 450-677-9411

29 December 2014
P&WC S.B. No. 39092R41. Planning Information

A. Effectivity For PT6B-37A Engines Pre-SB39089. Refer to Table 1 for list of affected engine serial numbers. B. Concurrent Requirements None. C. Reason (1) Problem The in-service life of bearing P/N 3310433-03 can be less than expected. (2) Cause The roller bearing internal clearance is not optimal. (3) Solution Replace bearing P/N 3310433-03 as required with bearing P/N 3310233-03 or P/N 3310533-03 with increased radial clearance. D. Description Replace bearing P/N 3310433-03 as required with bearing P/N 3310233-03 or P/N 3310533-03. E. Compliance For engine Serial Numbers PCE-PU0192, PU0193, PU0201, PU0208, PU0209, PU0212, PU0213, PU0214, PU0216, PU0219, PU0220. CATEGORY 3 - P&WC recommends to do this service bulletin within 450 flight hours

or by 31-July-2018 whichever comes first. For Engine Serial Numbers PCE-PU0001, PU0004, PU0006, PU0008, PU0009, PU0010, PU0015, PU0016, PU0023, PU0025, PU0033, PU0034, PU0036 thru PU0055, PU0058 thru PU0063, PU0066, PU0068, PU0069, PU0070, PU0072 thru PU0087, PU0092, PU0096, PU0098, PU0099, PU0100, PU0101, PU0102, PU0105 thru PU0113, PU0121, PU0122, PU0125 thru PU0142, PU0144, PU0147 thru PU0161, PU0163 thru PU0167, PU0169 thru PU0191, PU0194 thru PU0200, PU0202 thru PU0207. CATEGORY 3 - P&WC recommends to do this service bulletin no later than

31-July-2018. P&WC No. DCR24911, DCR28541 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 1 of 7 © 2014 Pratt & Whitney Canada Corp. PRINTED IN CANADA TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF1. Planning Information (Cont’d)

F. Approval D.A.A. approved G. Manpower No more man-hours are necessary 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 Overhaul Manual P/N 3053103 (PT6B-37A) Illustrated Parts Catalog P/N 3053104 (PT6B-37A) P&WC SB39095 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. 1007180. B. Material - Cost and Availability You can get the procurable parts listed in Para. 2.C. from any Pratt & Whitney Canada Parts Distribution Center.



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 2 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF2. Material Information (Cont’d) The estimated total cost of new parts needed to replace old parts is $Quote (US, 2014). The new parts are available. C. Material Necessary for Each Engine Not applicable. D. Reidentified Parts None. E. Tooling - Price and Availability Not applicable. 3. Accomplishment Instructions A. Remove RGB from engine in accordance with the overhaul manual instructions (Ref. 72-00-00 ENGINE - DISASSEMBLY-1). B. Identify the part number of No. 9 and 10 bearings (Ref. IPC 72-10-00, Fig. 3). C. If bearings are identified as P/N 3310433-03, do as follows: (1) Remove bearing outer race from housing (Ref. OHM 72-10-00 DISASSEMBLY - RGB Front Housing). (2) Remove bearings inner races from torquemeter gearshaft (Ref. OHM 72-10-00 DISASSEMBLY - Torquemeter and Idler Gear Shafts). (3) Replace bearing P/N 3310433-03 with P/N 3310233-03 or P/N 3310533-03 and re-assemble the gearbox (Ref. OHM 72-10-00 ASSEMBLY - Bearing Outer Races/Torquemeter Gearshaft). D. If bearing is identified as P/N 3310233-03 or P/N 3310533-03, re-Install RGB on engine in accordance with the overhaul manual instructions (Ref. 72-00-00 ENGINE - ASSEMBLY). E. Write accomplishment of P&WC S.B. No. 39092 in the engine module log book. 4. Appendix A. Refer Table 1 for the list of affected engine serial numbers.



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 3 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF4. Appendix (Cont’d) TABLE 1, List of affected Engine serial numbers Serial Numbers PU0001 PU0004 PU0006 PU0008 PU0009 PU0010 PU0015 PU0016 PU0023 PU0025 PU0033 PU0034 PU0036 PU0037 PU0038 PU0039 PU0040 PU0041 PU0042 PU0043 PU0044 PU0045 PU0046 PU0047 PU0048 PU0049 PU0050 PU0051 PU0052 PU0053 PU0054 PU0055 PU0058 PU0059 PU0060 PU0061 PU0062 PU0063 PU0066 PU0068 PU0069 PU0070 PU0072 PU0073 PU0074 PU0075 PU0076 PU0077 PU0078 PU0079 PU0080 PU0081



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 4 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF4. Appendix (Cont’d) TABLE 1, List of affected Engine serial numbers (Cont’d)

Serial Numbers PU0082 PU0083 PU0084 PU0085 PU0086 PU0087 PU0092 PU0096 PU0098 PU0099 PU0100 PU0101 PU0102 PU0105 PU0106 PU0107 PU0108 PU0109 PU0110 PU0111 PU0112 PU0113 PU0121 PU0122 PU0125 PU0126 PU0127 PU0128 PU0129 PU0130 PU0131 PU0132 PU0133 PU0134 PU0135 PU0136 PU0137 PU0138 PU0139 PU0140 PU0141 PU0142 PU0144 PU0147 PU0148 PU0149 PU0150 PU0151 PU0152 PU0153 PU0154 PU0155



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 5 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF4. Appendix (Cont’d) TABLE 1, List of affected Engine serial numbers (Cont’d)

Serial Numbers PU0156 PU0157 PU0158 PU0159 PU0160 PU0161 PU0163 PU0164 PU0165 PU0166 PU0167 PU0169 PU0170 PU0171 PU0172 PU0173 PU0174 PU0175 PU0176 PU0177 PU0178 PU0179 PU0180 PU0181 PU0182 PU0183 PU0184 PU0185 PU0186 PU0187 PU0188 PU0189 PU0190 PU0191 PU0192 PU0193 PU0194 PU0195 PU0196 PU0197 PU0198 PU0199 PU0200 PU0201 PU0202 PU0203 PU0204 PU0205 PU0206 PU0207 PU0208 PU0209



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 6 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF4. Appendix (Cont’d) TABLE 1, List of affected Engine serial numbers (Cont’d)

Serial Numbers PU0212 PU0213 PU0214 PU0216 PU0219 PU0220



### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39092R4

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 12/2014 PT6B-72-39092 Revision No. 4: Dec 29/2014 Page 7 of 7 TURBOSHAFT ENGINE NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF