# BULLETIN INDEX LOCATOR 

# 72-10-00

TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF

MODEL APPLICATION PT6B-37A Compliance: CATEGORY 3 Summary: In high torque conditions, bearing P/N 3310433-03 can move axially affecting

accuracy of engine torque signal output. The roller bearing internal clearance is not optimal. 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

Aug 05/2014 PT6B-72-39095 Revision No. 3: 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-72-39095, Rev. No. 3, dated Dec

29/2014 (P&WC S.B. No. 39095R3) NO. 10 BEARING, RGB ASSEMBLY - 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 service bulletin is revised to:

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

v revise the Compliance in para. 1.E.

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 05/2014 Revision No. 1: Aug 08/2014 Revision No. 2: Oct 01/2014 Revision No. 3: 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. 39095R31. Planning Information

A. Effectivity For PT6B-37A Engines Pre-SB39092. Refer to Table 1 for list of affected engine serial numbers. B. Concurrent Requirements None. C. Reason (1) Problem In high torque conditions, bearing P/N 3310433-03 can move axially affecting accuracy of engine torque signal output. (2) Cause The roller bearing internal clearance is not optimal. (3) Solution Measure axial movement of bearing P/N 3310433-03 for different torque conditions and report findings to P&WC. D. Description Measure axial movement of bearing P/N 3310433-03 for different torque conditions and report findings to P&WC. E. Compliance For engines with 500 flight hours or less since new: CATEGORY 3 - P&WC recommends an initial inspection within 50 flight hours after

receipt of this bulletin and recurring inspections every 100 flight hours up to a total of 500 flight hours then every 200 flight hours thereafter. For engines with more than 500 flight hours since new: CATEGORY 3 - P&WC recommends an initial inspection within 50 flight hours after

receipt of this bulletin and recurring inspections every 200 flight hours. F. Approval D.A.A. approved P&WC No. DCR28403 

### PRATT & WHITNEY CANADA



# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 1 of 12 © 2014 Pratt & Whitney Canada Corp. PRINTED IN CANADA TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF1. Planning Information (Cont’d)

G. Manpower Once you have access to the part, an estimate of 3.0 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. K. References Maintenance Manual P/N 3053102 (PT6B-37A) Illustrated Parts Catalog P/N 3053104 (PT6B-37A) P&WC SB No. 39092, No. 9 & 10 Bearings, RGB Assembly - Replacement of (PT6B-37A) 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 Not applicable. B. Material - Cost and Availability Not applicable. C. Material Necessary for Each Engine Not applicable. 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 2 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF2. Material Information (Cont’d)

D. Reidentified Parts None. E. Tooling - Price and Availability Not applicable. 3. Accomplishment Instructions CAUTION: BE CAREFUL NOT TO DROP THE TORQUEMETER VALVE DURING

REMOVAL. A. Remove Torquemeter Cover Assembly in accordance with the maintenance manual instructions (Ref. 72-10-09 TORQUEMETER - MAINTENANCE PRACTICES) and Figure 1. B. Identify the part number of the No. 10 bearing (Ref. IPC 72-10-00, Fig. 3). C. If the bearing is identified as P/N 3310433-03, do as follows: (1) At initial inspection or if previous marking is not visible on gear, manually turn the torquemeter gear clockwise and mark four points on the torquemeter gear 90° apart using a permanent marker (Ref. Fig. 2). (2) At each of the four points marked on the torquemeter gear (Ref. Fig. 2), take the axial measurement between the bearing P/N 3310433-03 and the Torquemeter Gear using a centesimal gauge (Ref. Fig. 3 and 4). Record the maximum measured value on the Record Sheet attached (Ref. Fig. 5). (3) If the maximum measured value is less than or equal to 2.6 mm, do P&WC S.B. No. 39092 and contact your local Field Service Representative (FSR). (4) If the maximum measured value is between 3.8 and 2.6 mm, re-install Torquemeter Cover Assembly in accordance with the maintenance manual instructions (Ref. 72-10-09 TORQUEMETER - MAINTENANCE PRACTICES). D. Complete the record sheet (Ref. Fig. 5) and send to P&WC Turboshaft group at: pwchelo@pwc.ca E. Write accomplishment of P&WC S.B. No. 39095 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. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 3 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION 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. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 4 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION 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. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 5 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION 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. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 6 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION 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. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 7 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OFC229008 Torquemeter Cover Assembly

Figure 1 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 8 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OFBEARING P/N 3310433−03 TORQUEMETER GEAR

C228527 Marking of Torquemeter Gear

Figure 2 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 9 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OFSEE FIGURE 4 FOR MEASURING POINT DETAIL

C229009 Measurement between Bearing and Torquemeter Gear Figure 3 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 10 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OFBEARING P/N 3310433−03 TORQUEMETER GEAR

C228528 Bearing P/N 3310433-03 and Torquemeter Gear

Figure 4 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 11 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OFFROM :

Send to P&WC e−mail : NAME : COMPANY : E−MAIL : FAX : TELEPHONE : P&WC SERVICE BULLETIN No. : ENGINE S/N : TTSN : TTSO :

REMARKS : MAXIMUM MEASURED VALUE (mm) : (Between Bearing and Torquemeter Gear) pwchelo@pwc.ca

RGB S/N :

C228529 Record Sheet Figure 5 

### PRATT & WHITNEY CANADA 

# SERVICE BULLETIN
P&WC S.B. No. 39095R3

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. Aug 05/2014 PT6B-72-39095 Revision No. 3: Dec 29/2014 Page 12 of 12 TURBOSHAFT ENGINE NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF