SERVICE BULLETIN

ENGINE — DISK ASSEMBLY, DRUM ROTOR, HIGH PRESSURE COMPRESSOR (HPC) AND

BLADE LOCKS, 14TH, AND 15TH STAGE — INTRODUCTION OF, TO IMPROVE DURABILITY

MODEL APPLICATION

PW4164, PW4168, PW4168A

BULLETIN ISSUE SEQUENCE

PW4G-100 Series 72-241

ATA NUMBER

72-35-00

UTC/P&W PROPRIETARY INFORMATION

This document is the property of United Technologies Corporation — Pratt & Whitney (UTC/P&W). You may not possess,

use, copy or disclose this document or any information in it, for any purpose, including without limitation to design,

manufacture, or repair parts, or obtain FAA or other government approval to do so, without UTC/P&W’s express written

permission. Neither receipt nor possession of this document alone, from any source, constitutes such permission.

Possession, use, copying or disclosure by anyone without UTC/P&W’s express written permission is not authorized

and may result in criminal and/or civil liability.

Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).

Compliance Category

8

P&W Distribution Code

2639

November 15/11

PW4G-100-72-241

Page 1 of 19

Published in United States of America
Summary

The purpose of this Service Bulletin is to introduce the Advantage70TM High Pressure Compressor

(HPC) rear drum rotor assembly into the PW4164, PW4168, and PW4168A engine models. Some

HPC rear drum rotor assemblies developed cracks in the blade loading and locking slots. The

root cause of these cracks is Thermal Mechanical Fatigue (TMF). The Advantage70TM drum rotor

assembly design is more durable and is less susceptible to TMF.

Planning Information

Effectivity Data

Engine Models Applicable

PW4164, PW4168, PW4168A

Engine Serial Nos. P733301 thru P733692*

* This estimate of engine serial numbers will be revised, if necessary, when parts are

installed in engines at Pratt & Whitney.

NOTE: The engine serial number effectivity data and its related engine model

identification contained in this Service Bulletin are taken from the records of

part(s) incorporation during initial manufacture.

After initial engine manufacture, but before final delivery, P&W may change

part(s) in the engine or change the model identification of the engine. Such

action is recorded on FAA337 forms.

To find Service Bulletin PW4G-100-72-241 models that are applicable, the

owner/operator of the engine must compare the Service Bulletin List supplied

with the engine as sent from P&W and the List of Changes incorporated at the

Airframer from FAA337 forms to the Service Bulletin PW4G-100-241 Effectivity

section.

Concurrent Requirements

This Service Bulletin must be done at the same time or after Reference 11, Service Bulletin

No. PW4G-100-72-240.

Reason

1. Problem: Some HPC rear drum rotor assemblies developed cracks in the blade

loading and locking slots.

2. Cause: The root cause is determined to be TMF. The TMF cracks are the result of

thermal gradients and related high stresses in the rear of the HPC section. The high

stresses are attributed to both the part geometry and shot peening. The loading and

locking slot part geometry has structural features that when subjected to high thermal

gradients, high stress zones are created. Shot peening adds a residual compressive

stress which protects against low cycle fatigue conditions, however, shot peening can

be a detriment and initiate TMF.

3. Solution: Introduce the Advantage70TM HPC rear drum rotor assembly that is less

susceptible to TMF into the PW4164, PW4168, and PW4168A engine models. The

Advantage70TM rear drum rotor assembly has a different loading and locking slot

geometry that is more durable and also incorporates a new shot peen specification.

New blade locks are necessary to fit the different loading and locking slot design.

Also, concurrent requirement Reference 11, Service Bulletin No. PW4G-100-72-240,

November 15/11

PW4G-100-72-241

Page 2

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
which introduced the new 13th, 14th and 15th stage seals, reduces gas leakage and

the associated thermal gradients which contributes to TMF.

Description

Replace the HPC rear drum rotor assembly and the 14th and 15th stage blade locks.

Compliance

Category 8

Do when the operator thinks that the change is necessary because of experience with

the parts being replaced.

Approval Data

The part number changes and/or part changes specified in the Material Information section

and Accomplishment Instructions of this Service Bulletin agree with the applicable Federal

Aviation Regulations and are FAA-Approved for the engine model(s) given.

Manpower

No more man-hours are necessary when done at complete disassembly/assembly.

Weight Data

No Change.

Electrical Load Data

Not Applicable.

Software Accomplishment Summary

Not Applicable.

References

1. Turbojet Engine Standard Practices Manual, Part No. 585005.

2. PW4164, PW4168, PW4168A, PW4170 Turbofan Engines, Illustrated Parts Catalog,

Part No. 51A343.

3. PW4164, PW4164-1D, PW4164C, PW4164C-1D, PW4164C/B, PW4164C/B-1D, PW4168,

PW4168A, PW4168A-1D, PW4170 Turbofan Engines, Engine Manual, Part No. 51A342.

4. PW4000 Series Turbofan Engines, Engine Cleaning, Inspection And Repair (CIR) Manual,

Part No. 51A357.

5. Service Bulletin No. PW4G-100-72-8; Engine — Blades, 14th And 15th Stage High

Pressure Compressor (HPC) — Modification To Provide Improved Platform Clearance And

Blade Locking. Issue Sequence 72-8, PW4G-100 Series.

6. Service Bulletin No. PW4G-100-72-17; Engine — Rotor And Stator Module, High Pressure

Compressor (HPC) — Replacement With Asymmetric Vane Pattern. Issue Sequence

72-17, PW4G-100 Series.

7. Service Bulletin No. PW4G-100-72-118; Engine — Blades And Stators, 6th, 7th, 8th And

9th Stage HPC — Modification Or Replacement Blades To Zirconium Oxide Coated Tips

And Shrouds With PWA 284-2 Rubstrips. Issue Sequence 72-118, PW4G-100 Series.

8. Service Bulletin No. PW4G-100-72-126; Engine — Lock And Setscrew, HPC Blade 9th

Thru 15th Stages — Replacement Of For Ease Of Removal At Overhaul. Issue Sequence

72-126, PW4G-100 Series.

November 15/11

PW4G-100-72-241

Page 3

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
9. Service Bulletin No. PW4G-100-72-188; Engine — Disk, High Pressure Compressor

(HPC) Drum Rotor Disk Assembly — Replacement Of With A More Durable Rear Hub

Scalloped Balance Flange Design. Issue Sequence 72-188, PW4G-100 Series.

10. Service Bulletin No. PW4G-100-72-219; Engine — Modification Of, To Incorporate The

Advantage70TM Performance And Durability Upgrade Kit To Improve Engine Reliability And

Reduce Thrust Specific Fuel Consumption. Issue Sequence 72-219, PW4G-100 Series.

11. Service Bulletin No. PW4G-100-72-240; Engine — Seal, 13Th, 14Th, And 15Th Stage,

High Pressure Compressor (HPC) — Replacement Of, And Introduction Of A New Shot

Peen Specification, To Improve Rear Drum Rotor Durability. Issue Sequence 72-240,

PW4G-100 Series.

NOTE: References 5 thru 10 are shown to help find configurations in relation to this

bulletin.

Publications Changed

PW4164, PW4168, PW4168A Turbofan Engines, Illustrated Parts Catalog, Part No.

51A343.

72-35-00, Figures 1, 8, and 9

PW4164, PW4168, PW4168A Turbofan Engines, Engine Manual, Part No. 51A342.

05-10-00

72-35-01

PW4000 Series Turbofan Engines, Engine Cleaning, Inspection And Repair (CIR) Manual,

Part No. 51A357.

72-35-00

72-35-10

Interchangeability

Old and new parts are interchangeable only in full sets.

Information in the Appendix

Alternate Accomplishment Instructions (No)

Progression Charts (Yes)

Added Data (Yes)

Revision to Table of Limits (Yes)

Inspection Procedures (No)

November 15/11

PW4G-100-72-241

Page 4

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
Material Information

Material — Cost and Availability

1. Part prices were not available at the time of Service Bulletin publication. Contact Pratt &

Whitney Spares Management & Logistics for firm quotations.

2. There is no kit provided to do this Service Bulletin.

3. Part availability information is provided in material data Instructions — Disposition.

Industry Support Program

Not Applicable.

The material data that follows is for each engine.

NOTE: It is possible to use the Chapter/Section and Figure/Item reference number

shown below the old part number to find the part in the Illustrated Parts Catalog.

Because there are many different configurations used, it is frequently necessary

to show more than one group of parts. When this occurs, parts that are

interchangeable are shown line-by-line only, unless this is shown differently.

CAUTION: THE FOLLOWING MATERIAL DATA TABLE(S) ARE ORGANIZED BY

ILLUSTRATED PARTS CATALOG. ALL PARTS IN THE TABLE(S) MAY OR

MAY NOT BE APPLICABLE TO ALL THE ENGINE MODELS SHOWN

IN THE TABLE HEADING. YOU MUST REFER TO THE APPROPRIATE

ILLUSTRATED PARTS CATALOG FOR ENGINE MODEL APPLICABILITY

USING THE OLD PART NUMBER (PN) AND CATALOG SEQUENCE

NUMBER. FAILURE TO INSTALL THE PART(S) IN THE CORRECT

ENGINE MODEL MAY RESULT IN A CONFIGURATION THAT IS NOT FAA

APPROVED.

The material data that follows is for each engine.

For PW4164, PW4168, PW4168A Engines:

New PN Qty Estimate of Unit

Price ($)

Keyword Old PN Instructions —

Disposition

For Engines That Do Not Incorporate Reference 10, Service Bulletin No. PW4G-100-72-219

Configuration 1: Drum Rotor Replacement In Axial Compressor Rotor Assembly, PN 58H678

58H678-002 1 COMPRESSOR

ROTOR ASSY

— AXIAL

58H678

(72-35-00-1-90 A)

(1)(NP)

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

58H236-01

(72-35-00-1-190 B)

(2)(A)(N)

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

November 15/11

PW4G-100-72-241

Page 5

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
New PN Qty Estimate of Unit

Price ($)

Keyword Old PN Instructions —

Disposition

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

54H803-002

(72-35-00-1-190AB)

(2)(A)(N)

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

56H013-001

(72-35-00-1-190 A)

(2)(A)(N)

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

Configuration 2: Drum Rotor Replacement In Axial Compressor Rotor Assembly, PN 59H078

50S192 1 COMPRESSOR

ROTOR ASSY

— AXIAL

59H078

(72-35-00-1-90 B)

(1)(NP)

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

58H236-01

(72-35-00-1-190 B)

(2)(A)(N)

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

54H803-002

(72-35-00-1-190AB)

(2)(A)(N)

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * .DISK — ASSY

OF, HPC DRUM

ROTOR

56H013-001

(72-35-00-1-190 A)

(2)(A)(N)

November 15/11

PW4G-100-72-241

Page 6

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
New PN Qty Estimate of Unit

Price ($)

Keyword Old PN Instructions —

Disposition

50S154 8 * .LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * .LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

For Engines That Incorporate Reference 10, Service Bulletin No. PW4G-100-72-219

Configuration 3: Drum Rotor Replacement In Axial Compressor Rotor Assembly, PN 58H678-001

50S057 1 ROTOR AND

STATOR

ASSY — HPC

MODULE

57H077-001 (1)(NP)

52A520 1 .COMPRESSOR

ROTOR ASSY

— AXIAL

58H678-001 (1)(NP)

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

58H236-01

(72-35-00-1-190 B)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

54H803-002

(72-35-00-1-190AB)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

56H013-001

(72-35-00-1-190 A)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

Configuration 4: Drum Rotor Replacement In Axial Compressor Rotor Assembly, PN 59H078-001

November 15/11

PW4G-100-72-241

Page 7

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
New PN Qty Estimate of Unit

Price ($)

Keyword Old PN Instructions —

Disposition

50S057 1 ROTOR AND

STATOR

ASSY — HPC

MODULE

57H077-001 (1)(NP)

52A520 1 .COMPRESSOR

ROTOR ASSY

— AXIAL

59H078-001 (1)(NP)

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

58H236-01

(72-35-00-1-190 B)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

54H803-002

(72-35-00-1-190AB)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

OR

50S813-01 1 * ..DISK — ASSY

OF, HPC DRUM

ROTOR

56H013-001

(72-35-00-1-190 A)

(2)(A)(N)

50S154 8 * ..LOCK ASSY —

HPC, 14STG

56H319

(72-35-00-8-40 B)

(2)(A)(C)

50S153 8 * ..LOCK ASSY —

HPC, 15STG

56H324

(72-35-00-9-50 B)

(2)(A)(C)

Modification and Spares Information

Estimated part prices are provided when they are available at time of publication. The

Estimate of Unit Price is only for planning purposes and does not constitute a firm

quotation. An asterisk (*) is shown where part pricing information was unavailable. In either

case, contact Pratt & Whitney Spares Management & Logistics for firm quotations.

Parts Modification Conditions

(1) The new part can be obtained by modification of the old part as specified in the

Accomplishment Instructions.

November 15/11

PW4G-100-72-241

Page 8

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
(2) The new part is a replacement part only, and cannot be obtained by modification

of the old part.

Spare Parts Availability

(A) The new part is available.

(C) The old part will continue to be supplied.

(N) The old part is not available.

(NP) The part is an item that is usually not procured as a spare item.

Vendor Services or Special Components/Materials

Not Applicable.

Material Data for Each Spare Engine

The material for each spare engine is as stated in the preceding material information

section.

Reidentified Parts

Reidentified Parts Data

New PN Keyword Old PN

50S057 ROTOR AND STATOR

ASSY — HPC

MODULE

57H077-001

58H678-002 COMPRESSOR

ROTOR ASSY —

AXIAL

58H678

50S192 COMPRESSOR

ROTOR ASSY —

AXIAL

59H078

52A520 COMPRESSOR

ROTOR ASSY —

AXIAL

58H678-001

52A520 COMPRESSOR

ROTOR ASSY —

AXIAL

59H078-001

Necessary Tools

No more Support Equipment is necessary.

Other Material Information Data

Not Applicable.

November 15/11

PW4G-100-72-241

Page 9

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
Accomplishment Instructions

For Engines That Do Not Incorporate Reference 10, Service Bulletin No. PW4G-100-72-219

1. Replace the Drum Rotor Assembly, PN 58H236-01, PN 54H803-002 or PN 56H013-001

with PN 50S813-01. See Figure 1.

2. Replace the locks and setscrew assemblies as follows. See Figures 2 and 3.

A. Replace eight 14th Stage Lock And Setscrew Assemblies, PN 56H319 with

PN 50S154.

B. Replace eight 15th Stage Lock And Setscrew Assemblies, PN 56H324 with

PN 50S153.

NOTE: When you do this Service Bulletin, you must do Reference 11, Service Bulletin

No. PW4G-100-72-240 (seal replacement).

3. Reidentify the modified Compressor Rotor Assembly as specified in Table 1. Mark the new

part number as specified in Reference 1, Standard Practices Manual, Chapter/Section

70-11-00, Class 44. See Figure 4.

Table 1

New PN Old PN

58H678-002 58H678

50S192 59H078

For Engines That Incorporate Reference 10, Service Bulletin No. PW4G-100-72-219

1. Replace the Drum Rotor Assembly, PN 54H803-002, PN 58H236-01 or PN 56H013-001

with PN 50S813-01. See Figure 1.

2. Replace the locks and setscrew assemblies as follows. See Figures 2 and 3.

A. Replace eight 14th Stage Lock And Setscrew Assemblies, PN 56H319 with

PN 50S154.

B. Replace eight 15th Stage Lock And Setscrew Assemblies, PN 56H324 with

PN 50S153.

NOTE: When you do this Service Bulletin, you must do Reference 11, Service Bulletin

No. PW4G-100-72-240 (seal replacement).

3. Reidentify the modified Compressor Rotor Assembly as specified in Table 2. Mark the new

part number as specified in Reference 1, Standard Practices Manual, Chapter/Section

70-11-00, Class 44. See Figure 4.

Table 2

New PN Old PN

52A520 58H678-001

52A520 59H078-001

November 15/11

PW4G-100-72-241

Page 10

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
4. Reidentify the modified Rotor And Stator Assembly as specified in Table 3. Mark the new

part number as specified in Reference 1, Standard Practices Manual, Chapter/Section

70-11-00, Class 39. See Figure 5.

Table 3

New PN Old PN

50S057 57H077-001

November 15/11

PW4G-100-72-241

Page 11

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
LOCATION OF THE HPC REAR DRUM ROTOR ASSEMBLY

72-35-00

FIGURE 1

November 15/11

PW4G-100-72-241

Page 12

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
LOCATION OF THE 14TH STAGE LOCK AND SETSCREW ASSEMBLY

72-35-00

FIGURE 2

November 15/11

PW4G-100-72-241

Page 13

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
LOCATION OF THE 15TH STAGE LOCK AND SETSCREW ASSEMBLY

72-35-00

FIGURE 3

November 15/11

PW4G-100-72-241

Page 14

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
MARKING LOCATION OF THE COMPRESSOR ROTOR ASSEMBLY

FIGURE 4

November 15/11

PW4G-100-72-241

Page 15

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
MARKING LOCATION OF THE ROTOR AND STATOR ASSEMBLY

FIGURE 5

November 15/11

PW4G-100-72-241

Page 16

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
Appendix

Parts Progression To Show the Changed Part in Relation to Other Parts

ROTOR AND STATOR ASSEMBLY

CHART A

COMPRESSOR ROTOR ASSEMBLY

CHART B

November 15/11

PW4G-100-72-241

Page 17

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).
DRUM ROTOR DISK ASSEMBLY

CHART C

14TH AND 15TH STAGE LOCK AND SETSCREW ASSEMBLY

CHART D

Added Data

Internal Reference Information

Revision No.

Reference

Document

Origination

Original

EC09KA021

EC09KA021G

EC09KA021X

EC09KA021Y

EC10KK044T

KVG/MJS

Number values shown in parentheses adjacent to U.S. values are International System of

units (SI) equivalents.

November 15/11

PW4G-100-72-241

Page 18

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not Subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3).
To calculate part life, include the hours and/or cycles since the part was made. Use the total

hours or cycles to calculate life limits that are the result of part modification, a part used in an

engine with different thrust, or for some other reason.

Revision to Table of Limits

Engine Manual(s), Chapter/Section 05-10-00, Revision 69, dated May 15, 2012 is scheduled to

incorporate the Part Service Life Limits related to this Service Bulletin and will take precedence

over the Service Bulletin.

Revision to Table of Limits life cycles is as follows:

Model Part Number Part Name Life Limit (cycles)

PW4164, PW4168,

PW4168A

50S813-01 DISK — ASSY OF,

HPC DRUM ROTOR

14,900

November 15/11

PW4G-100-72-241

Page 19

UTC/P&W PROPRIETARY INFORMATION

Subject to the restrictions on the cover or first page.

Not subject to the EAR per 15 C.F.R Chapter 1, Part 734.3(b)(3).