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

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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

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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. 39095R3

1. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 © 2014 Pratt & Whitney Canada Corp. Page 1 of 12

PRINTED IN CANADA

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
1. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 2 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
2. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 3 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
4. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 4 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
4. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 5 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
4. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 6 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
4. 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 7 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
C229008

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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 8 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
BEARING

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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 9 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
SEE 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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 10 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
BEARING

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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 11 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF
Send to P&WC e−mail : FROM :

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

Aug 05/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39095

Revision No. 3: Dec 29/2014 Page 12 of 12

TURBOSHAFT ENGINE

NO. 10 BEARING, RGB ASSEMBLY - INSPECTION OF