SERVICE BULLETIN

ENGINE — DISK, 6TH STAGE LOW PRESSURE TURBINE (LPT) — INSPECTION

FOR SUSPECT 6TH STAGE LPT DISKS

MODEL APPLICATION

PW4164, PW4168, PW4168A, PW4168A-1D, PW4170

BULLETIN ISSUE SEQUENCE

PW4G-100 Series 72-252

ATA NUMBER

72-53-00

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

6

P&W Distribution Code

2639

November 18/14

PW4G-100-72-252

Page 1 of 9

Published in United States of America
Summary

The purpose of this Service Bulletin is to give instructions to do an inspection of the 6th Stage Low

Pressure Turbine (LPT) Disk, PN 50N886 and remove suspect parts from service. A PW4000-100

series engine model 6th stage LPT disk was found cracked through the front and rear knife edge

seals during a scheduled heavy maintenance shop visit. An investigation revealed that the 6th stage

LPT disk had been previously weld repaired at the knife edge. 18 6th stage LPT disks have been

identified as having undergone Reference 3, CIR Manual, Chapter/Section 72-53-16, Repair-14.

This Service Bulletin lists the Serial Number’s (SN’s) of those parts. Remove suspect 6th stage

LPT disks from service.

Planning Information

Effectivity Data

Engine Models Applicable

PW4164, PW4168, PW4168A, PW4168A-1D, PW4170

Engine Serial No. — All engines with 6th Stage LPT Disks, PN 50N886.

This Service Bulletin also applies to engines converted to the PW4164-1D, PW4168-1D,

PW4168A-1D, PW4170 models by Service Bulletin PW4G-100-72-220.

Concurrent Requirements

There are no concurrent requirements.

Reason

1. Problem: A PW4000-100 series engine model 6th stage LPT disk was found cracked

through the front and rear knife edge seals during a scheduled heavy maintenance

shop visit. An investigation revealed that a 6th stage LPT disk had been previously

weld repaired at the knife edge. Investigation has determined that 18 6th stage

LPT disks have been identified as having undergone Reference 3, CIR Manual,

Chapter/Section 72-53-16, Repair-14.

2. Cause: Engineering is investigating, but it is suspected that unacceptable stresses

were induced in the part at the referenced knife edge weld repair.

3. Solution: Remove all suspect 6th stage LPT disks from service. See Table 1 for

applicable SN’s. Use of the weld repair has been suspended.

Description

Do an inspection of the 6th stage LPT disks and remove suspect parts from service.

Compliance

Category 6

Do when the subassembly (i.e. modules, accessories, components, build groups) is

disassembled sufficiently to give access to the changed part and to all changed spare parts.

Approval Data

The times between inspections specified in Compliance and the inspection procedures

specified in the Accomplishment Instructions 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.

November 18/14

PW4G-100-72-252

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

Part No. 51A357.

4. Service Bulletin No. PW4G-100-72-220; Engine — Conversion Of A PW4164, PW4168,

Or PW4168A Engine To A PW4164-1D, PW4168-1D, PW4168A-1D, Or PW4170 Engine.

Issue Sequence 72-220, PW4G-100 Series.

NOTE: Reference 4 is shown to help find non-production configurations that may

incorporate this bulletin.

Publications Changed

Not Applicable.

Interchangeability

Not Applicable.

Information in the Appendix

Alternate Accomplishment Instructions (No)

Progression Charts (No)

Added Data (Yes)

Revision to Table of Limits (No)

Inspection Procedures (No)

November 18/14

PW4G-100-72-252

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).
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.

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, PW4168A-1D, PW4170 Engines:

New PN Qty Estimate of Unit

Price ($)

Keyword Old PN Instructions —

Disposition

1 DISK — LPT,

6STG

50N886

(72-53-00-7-320 A)

(4)(X)

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

(4) Do an inspection as specified in the Accomplishment Instructions.

Spare Parts Availability

(X) See Reference 2, Illustrated Parts Catalog for applicable replacement parts.

Vendor Services or Special Components/Materials

November 18/14

PW4G-100-72-252

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).
Vendor Services or Special Components/Materials

P&W

Designation

Vendor

Designation

Name Vendor Name & Address

50N886 6th Stage LPT Disk CPR No. 33911

Pratt & Whitney

400 Main Street,

Well No. 5-CPR

East Hartford, CT 06118

USA

Customer Part Returns (CPR)

(D Building, Column G1-15)

Attn: Maria lnacio

(860) 565 6070

NOTE: EXCEPT FOR WORK OR SUPPLIES TO BE PERFORMED OR FURNISHED

BY PRATT & WHITNEY, IT IS UNDERSTOOD THAT PRATT & WHITNEY

DOES NOT ENDORSE THE WORK PERFORMED BY THE COMPANY OR

COMPANIES NAMED HEREIN OR ANY OTHER COMPANY AND DOES NOT

ACCEPT RESPONSIBILITY TO ANY DEGREE FOR THE SELECTION OF

SUCH COMPANY OR COMPANIES FOR THE PERFORMANCE OF ANY

WORK OR PROCUREMENT OF SUPPLIES.

Material Data for Each Spare Engine

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

section.

Reidentified Parts

Not Applicable.

Necessary Tools

No more Support Equipment is necessary.

Other Material Information Data

Not Applicable.

November 18/14

PW4G-100-72-252

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).
Accomplishment Instructions

1. Do an inspection of the 6th Stage LPT Disks, PN 50N886 to find if the disk is from the

suspect lot. See Figure 1 for the location of part and Figure 2 for 6th Stage LPT Disk

serial number marking location.

A. If the 6th Stage LPT Disk has a serial number that is in Table 1, remove the part from

service. Send the part to the vendor listed in the Vendor Services section. Use a

CPR green label.

B. If the 6th Stage LPT disk does not have a serial number listed in Table 1, the 6th

Stage LPT Disk is acceptable and can continue in service.

Table 1 — Suspect 6th Stage LPT Disks, PN 50N886

SERIAL

NUMBER

SERIAL

NUMBER

SERIAL

NUMBER

SERIAL

NUMBER

SERIAL

NUMBER

SERIAL

NUMBER

CLDLCK5958 CLDLA61865 CLDLCY1009 CLDLA03118 CLDLBP0238 CLDLAX7121

CLDLA03121 CLDLAX7102 CLDLCW2006 CLDLCP6995 CLDLBH4384 CLDLA61866

CLDLCY1010 CLDLAX7095 CLDLAX7110 CLDLCP7002 CLDLCE6129 CLDLC01299

November 18/14

PW4G-100-72-252

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).
LOCATION OF THE 6TH STAGE LPT DISK

72-53-00

FIGURE 1

November 18/14

PW4G-100-72-252

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).
6TH STAGE LPT DISK SERIAL NUMBER MARKING LOCATION

FIGURE 2

November 18/14

PW4G-100-72-252

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).
Appendix

Added Data

Internal Reference Information

Revision No.

Reference

Document

Origination

Original EA14KC772 RG/IEL

November 18/14

PW4G-100-72-252

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).