# SER VICE BULLETIN

ENGINE

— DISK, 6TH ST AGE LOW PRESSURE TURBINE (LPT)

— INSPECTION FOR SUSPECT 6TH ST AGE LPT DISKS

M O D E L A P P L I CA T I O N PW4164, PW4168, PW4168A, PW4168A-1D, PW4170

B U L L E T I N I S S U E S E Q U E N C E PW4G-100 Series 72-252

A T A N U M B E R 72-53-00

U TC/ P &W P RO P R I E T A R Y I N F O R M A T I O N This document is the property of United T echnologies Corporation

— Pratt & Whitney (UTC/P&W). Y ou 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 F AA 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). C o m p l i a n ce C ate g o ry 6 P &W D i st ri b u t i o n C o d e 2639
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# PW4G-100-72-252 Page 1 of 9
Published in United States of AmericaS u m m a ry 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. P l a n n i n g I n f o rm at i o n Ef fe ct i v i ty D ata E n g i n e M o d e l s Ap p l i ca b l e 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. C o n c u rre n t Re q u i re m e n ts There are no concurrent requirements. Re a s o n 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 T able 1 for applicable SN’ s. Use of the weld repair has been suspended. D e s c ri pt i o n Do an inspection of the 6th stage LPT disks and remove suspect parts from service. C o m p l i a n ce Category 6 Do when the subassembly (i.e. modules, accessories, components, build groups) is disassembled suf ficiently to give access to the changed part and to all changed spare parts. Ap p rova l D ata The times between inspections specified in Compliance and the inspection procedures specified in the Accomplishment Instructions agree with the applicable Federal A viation Regulations and are F AA-Approved for the engine model(s) given. M a n p owe r No more man-hours are necessary when done at complete disassembly/assembly

. November 18/14 

# PW4G-100-72-252 Page 2 UTC/P&W PROPRIET AR Y INFORMA TION 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).We i g h t D ata No Change. E l e ct ri ca l Lo a d D ata Not Applicable. S of twa re Acco m p l i s h m e n t S u m m a ry Not Applicable. Refe re n ce s 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 T o A PW4164-1D, PW4168-1D, PW4168A-1D, Or PW4170 Engine. Issue Sequence 72-220, PW4G-100 Series. N OT E : Reference 4 is shown to help find non-production configurations that may incorporate this bulletin. P u b l i cat i o n s C h a n g e d Not Applicable. I n te rc h a n g e a b i l i ty Not Applicable. I n f o rm at i o n i n t h e Ap p e n d i x Alternate Accomplishment Instructions (No) Progression Charts (No) Added Data (Y es) Revision to T able of Limits (No) Inspection Procedures (No)

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# PW4G-100-72-252 Page 3 UTC/P&W PROPRIET AR Y INFORMA TION 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).M ate ri a l I n f o rm at i o n M ate ri a l

— C ost a n d A va i l a b i l i ty 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. I n d u st ry S u p p o rt P rog ra m Not Applicable. T h e m ate ri a l d ata t h at f o l l ows i s f o r e a c h e n g i n e

. N OT E : 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. CA U T I O N : THE FOLLOWING MA TERIAL DA T A T ABLE(S) ARE ORGANIZED BY ILLUSTRA TED P ARTS CA T ALOG. ALL P ARTS IN THE T ABLE(S) MA Y OR MA Y NOT BE APPLICABLE TO ALL THE ENGINE MODELS SHOWN IN THE T ABLE HEADING. YOU MUST REFER TO THE APPROPRIA TE ILLUSTRA TED P ARTS CA T ALOG FOR ENGINE MODEL APPLICABILITY USING THE OLD P ART NUMBER (PN) AND CA T ALOG SEQUENCE NUMBER. F AILURE TO INST ALL THE P ART(S) IN THE CORRECT ENGINE MODEL MA Y RESUL T IN A CONFIGURA TION THA T IS NOT F AA APPROVED. T h e m ate ri a l d ata t h at f o l l ows i s f o r e a c h e n g i n e

. F o r PW4 1 64 , PW4 1 6 8 , PW4 1 6 8A , PW4 1 6 8A

- 1 D , PW4 1 7 0 E n g i n e s : 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)

M o d i fi cat i o n a n d S p a re s I n f o rm at i o n 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 A vailability (X) See Reference 2, Illustrated Parts Catalog for applicable replacement parts. V endor Services or Special Components/Materials

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# PW4G-100-72-252 Page 4 UTC/P&W PROPRIET AR Y INFORMA TION 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).V e n d o r S e r v i ce s o r S p e c i a l C o m p o n e n ts/ M ate ri a l s P&W Designation V endor Designation Name V endor Name & Address

50N886 6th Stage LPT Disk CPR No. 3391 1 Pratt & Whitney 400 Main Street, Well No. 5-CPR East Hartford, CT 061 18 USA Customer Part Returns (CPR) (D Building, Column G1-15) Attn: Maria lnacio (860) 565 6070 N OT E : EXCEPT FOR WORK OR SUPPLIES TO BE PERFORMED OR FURNISHED BY PRA TT & WHITNEY , IT IS UNDERSTOOD THA T PRA TT & WHITNEY DOES NOT ENDORSE THE WORK PERFORMED BY THE COMP ANY OR COMP ANIES NAMED HEREIN OR ANY OTHER COMP ANY AND DOES NOT ACCEPT RESPONSIBILITY TO ANY DEGREE FOR THE SELECTION OF SUCH COMP ANY OR COMP ANIES FOR THE PERFORMANCE OF ANY WORK OR PROCUREMENT OF SUPPLIES. M ate ri a l D ata f o r E a c h S p a re E n g i n e The material for each spare engine is as stated in the preceding material information section. Re i d e n t i fi e d P a rts Not Applicable. N e ce s s a ry T oo l s No more Support Equipment is necessary

. Ot h e r M ate ri a l I n f o rm at i o n D ata Not Applicable.

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# PW4G-100-72-252 Page 5 UTC/P&W PROPRIET AR Y INFORMA TION 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).Acco m p l i s h m e n t I n st ru ct i o n s 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 T able 1, remove the part from service. Send the part to the vendor listed in the V endor Services section. Use a CPR green label. B. If the 6th Stage LPT disk does not have a serial number listed in T able 1, the 6th Stage LPT Disk is acceptable and can continue in service. T a b l e 1

— S u s p e ct 6t h Sta g e L PT D i s ks , P N 5 0 N 8 8 6 SERIAL NUMBER SERIAL NUMBER SERIAL NUMBER SERIAL NUMBER SERIAL NUMBER SERIAL NUMBER CLDLCK5958 CLDLA61865 CLDLCY1009 CLDLA031 18 CLDLBP0238 CLDLAX7121 CLDLA03121 CLDLAX7102 CLDLCW2006 CLDLCP6995 CLDLBH4384 CLDLA61866 CLDLCY1010 CLDLAX7095 CLDLAX71 10 CLDLCP7002 CLDLCE6129 CLDLC01299

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# PW4G-100-72-252 Page 6 UTC/P&W PROPRIET AR Y INFORMA TION 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).LOCA TION OF THE 6TH ST AGE LPT DISK 72-53-00 FIGURE 1

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# PW4G-100-72-252 Page 7 UTC/P&W PROPRIET AR Y INFORMA TION 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 ST AGE LPT DISK SERIAL NUMBER MARKING LOCA TION FIGURE 2

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# PW4G-100-72-252 Page 8 UTC/P&W PROPRIET AR Y INFORMA TION 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).Ap p e n d i x Ad d e d D ata I n te rn a l Refe re n ce I n f o rm at i o n
Revision No. Reference Document Origination Original EA14KC772 RG/IEL

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# PW4G-100-72-252 Page 9 UTC/P&W PROPRIET AR Y INFORMA TION 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).