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

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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 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. 39092R4

1. 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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 © 2014 Pratt & Whitney Canada Corp. Page 1 of 7

PRINTED IN CANADA

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF
1. 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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 2 of 7

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT OF
2. 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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 3 of 7

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT 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. 39092R4

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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 4 of 7

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT 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. 39092R4

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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 5 of 7

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT 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. 39092R4

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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 6 of 7

TURBOSHAFT ENGINE

NO. 9 & 10 BEARINGS, RGB ASSEMBLY - REPLACEMENT 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. 39092R4

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

Feb 12/2014 The export control classification with respect to this document is contained on the back of the locator. PT6B-72-39092

Revision No. 4: Dec 29/2014 Page 7 of 7

TURBOSHAFT ENGINE

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