# Pratt & Whitney Service Instruction 112F-21: No revision named - Rights: © Pratt & Whitney. Filed by the FAA in regulations.gov docket FAA-2021-0544, the docket of AD 2021-14-19. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Pratt & Whitney Service Instruction 112F-21](https://openairdocs.org/service-documents/pratt-whitney/112f-21.md) - Title as filed: SI 112F-21 - Pages: 6 - PDF: https://openairdocs.org/files/sha256/95/62/9562df915f1d0b5c9b50d9e8c7b49cab2d286e48d7d060eb7a85e9eaf19738e9 - Page: https://openairdocs.org/service-documents/pratt-whitney/112f-21/file/9562df915f1d ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) SPECIAL INSTRUCTION NO. 112F-21 Pratt & Whitney A United Technologies Company SPECIAL INSTRUCTION NO. 112F-21 May 24, 2021 V2500 High Pressure Turbine Hubs - Require removal APPLICATION: This Special Instruction is applicable to the stage 1 High Pressure Turbine Hub Part Number 2A5001 and stage 2 High Pressure Turbine Hub Part Number 2A4802 with Serial Numbers listed in this document. Type Certificate Holder is International Aero Engines, AG (IAE AG). Pratt & Whitney is providing this data on behalf of IAE AG. UTC/P&W PROPRIETARY INFORMATION This document contains proprietary information of United Technologies Corporation ("UTC") and/or of one or more of UTC's vorldwide divisions, subsidiaries, and affiliates including Pratt & Whitney and UTC Aerospace Systems and/or of a supplier and/o partner to any of the foregoing UTC entities. The proprietary information set forth in this document is provided in confidence and solely for the purposes of supporting engine certification and providing applicable information regarding the proper use, maintenance, inspection, repair, and servicing and parts application of Pratt & Whitney engine products and services ("Purpose"). By accepting this document the recipient agrees to limit copying the document, or any information in it, solely for distribution within the recipient's company or to a third party to carry out the stated Purpose for the document and any information in it. You cannot possess, use, copy, or disclose this document or any information in it for any purpose other than that stated above, without UTC's express written permission. Violation of these restrictions may result in criminal and/or civil liability. Neither this document 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. If a Government agency or department intends to disclose any information, written notice should be given to: (1) VP and Counsel, Commercial Engines, Pratt & Whitney, 400 Main Street, East Hartford, CT 06108, U.S.A.; and (2) Intellectual Property Counsel, UTC Aerospace Systems, 1 Hamilton Road, Windsor Locks, CT 06096. U.S.A WARNING - This document contains technical data the export of which is or may be restricted by the Export Administration Act and the Export Administration Regulations (EAR), 15 C.F.R. parts 730-774. Diversion contrary to U.S. law is prohibited. The export, re-export, transfer or re-transfer of this technical data to any other company, entity, person, or destination, or for any use or purpose other than that for which the technical data was originally provided by P&W, is prohibited without prior written approval from P&W and authorization under applicable export control laws. EAR Export Classification identified on the following page(s) Distribution Code Internal Reference NO. 6322 MTK EA 21VC208 SPECIAL DISTRIBUTION (2) PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 1 of 6 ### Page 2 SPECIAL INSTRUCTION NO. 112F-21 PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 2 of 6 THE REASON FOR THIS SPECIAL INSTRUCTION: On March 18, 2020 V16580 engine experienced an aborted take-off, a fracture of the High Pressure Turbine (HPT) stage 1 Hub and an uncontained event. The cause of fracture is an anomaly in the material. Recent findings require accelerated removal of certain suspect HPT hubs. The part number and serial number hubs listed in Table 1 and 2 of this document require removal from service within specified cyclic draw down limits and subsequent angle scan ultrasonic inspection per NMSB 72-0713 Revision 1. APPROVAL: Not applicable. DESCRIPTION: The purpose of this Special Instruction (SI) is to remove from service within specified cyclic draw down limits the HPT stage 1 Hub Part Number 2A5001 and HPT stage 2 Hub Part Number 2A4802 with Serial Numbers listed in this document and to subsequently perform angle scan ultrasonic inspection per NMSB 72-0713 Revision 1. COMPLIANCE CATEGORY: Category 3 For 1st Stage Turbine Hubs, P/N 2A5001, Serial Numbers identified in Table 1. 1) Accomplish the inspection of hubs that have operated in V2533-A5, V2530-A5, V2527E-A5, V2527M-A5, or V2528-D5 engine models, no matter the duration, before 100 additional cycles are accumulated after the time of receipt of this SI. 2) Accomplish the inspection of hubs that have operated in V2527-A5, V2524-A5, V2522-A5, or V2525-D5 engine models, no matter the duration, before 220 additional cycles are accumulated after the time of receipt of this SI. For 2nd Stage Turbine Hubs, P/N 2A4802, Serial Numbers identified in Table 2. 1) Accomplish the inspection of hubs that have operated in V2533-A5, V2530-A5, V2527E-A5, V2527M-A5, or V2528-D5 engine models, no matter the duration, before 385 additional cycles are accumulated after the time of receipt of this SI. 2) Accomplish the inspection of hubs that have operated in V2527-A5, V2524-A5, V2522-A5, or V2525-D5 engine models, no matter the duration, before 620 additional cycles are accumulated after the time of receipt of this SI. REFERENCES: A. ATA Locator – 72-45-11, 72-45-31. B. V2500-A5 Series Illustrated Parts Catalog, P&W Ref. PN 2A4428, Chapter/Section 72-45-11, 72-45-31. C. V2500-A1/A5 Series Engine Manual, P&W Ref. PN 2A4407, Chapter/Section 72-45-11, 72-45-31. D. V2500-D5, Series Illustrated Parts Catalog, P&W Ref. PN 2A4426, Chapter/Section 72-45-11, 72-45-31. E. V2500-D5 Series Engine Manual, P&W Ref. PN 2A4416, Chapter/Section 72-45-11, 72-45-31. F. V2500 72-0713 NON-MODIFICATION SERVICE BULLETIN — ENGINE — HUB, HIGH PRESSURE TURBINE (HPT), STAGE 1 AND 2 — ANGLE SCAN ULTRASONIC INSPECTION TO FIND AN ANOMALY IN THE MATERIAL NECESSARY TOOLS: See Engine Removal Task in AMM. ADDED DATA: A. Time to Accomplish Task: N/A. B. Disposition of Hardware Removed: See Hardware Disposition Instructions below. C. Consumables Required for task for each engine. Part Name Part Number UPE ### Page 3 SPECIAL INSTRUCTION NO. 112F-21 PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 3 of 6 N/A N/A N/A ACCOMPLISHMENT INSTRUCTIONS: 1) Remove from service engines containing hubs with Serial Numbers listed in Table 1 and 2 within the cyclic draw down limits specified in the Compliance section above. 2) Accomplish inspection of HPT stage 1 and 2 Hub per NMSB 72-0713 Revision 1. NOTE – Compliance with this SI in its entirety constitutes compliance with NMSB 72-0713 Revision 1. Hubs that are removed form service and are inspected per NMSB 72-0713 Revision 1 in accordance with this SI and are found acceptable will be marked as such per NMSB 72-0713 Revision 1. Table 1. HPT stage 1 Hub Serial Number. PKLBP29920 PKLBP39405 PKLBP49209 PKLBP49210 PKLBP49211 PKLBP49212 PKLBP49213 PKLBP49214 PKLBP49215 PKLBP49219 PKLBP49398 PKLBP49399 PKLBP49401 PKLBP49753 PKLBP52035 PKLBP52038 PKLBP52142 PKLBP52143 PKLBP52449 PKLBP52452 PKLBP52540 PKLBP52542 PKLBP53078 PKLBP53079 PKLBP53081 PKLBP53087 PKLBP53477 PKLBP53479 PKLBP53480 PKLBP53481 PKLBP53493 PKLBP58796 PKLBP58797 PKLBP58798 PKLBP58799 PKLBP59007 PKLBP59009 PKLBP59010 PKLBP59015 PKLBP59016 PKLBP59017 PKLBP59025 PKLBP59868 PKLBP59869 PKLBP59870 PKLBP69055 PKLBP69056 PKLBP69223 PKLBP69224 PKLBP69599 PKLBP69601 PKLBP69602 PKLBP86827 PKLBP89738 PKLBP89740 PKLBP89741 PKLBP89869 PKLBP90200 PKLBP91267 PKLBP91269 PKLBP91450 PKLBP95224 PKLBP95225 PKLBP95227 PKLBP99501 PKLBR09554 PKLBR09557 PKLBR09592 PKLBR09594 PKLBR10180 PKLBR10181 PKLBR10182 PKLBR15327 PKLBR15962 PKLBR16497 PKLBR16949 PKLBR17168 PKLBR17171 PKLBR18007 PKLBR28545 PKLBR36042 PKLBR79640 PKLBR79641 PKLBRA2261 PKLBRA2310 PKLBRA2312 PKLBRA3646 PKLBRA3647 PKLBRA3652 PKLBRA6543 PKLBRA7313 PKLBRA8079 PKLBRA8081 PKLBRB7326 PKLBRB9442 PKLBRB9946 PKLBRC9414 PKLBRC9416 PKLBRD9075 PKLBRD9076 PKLBRD9077 PKLBRD9694 PKLBRE1478 PKLBRE1479 PKLBRE1480 PKLBRE1481 PKLBRE1718 PKLBRE1722 PKLBRE1723 PKLBRE1724 PKLBRE9729 PKLBRE9730 PKLBRF8409 PKLBRJ9166 PKLBRJ9425 PKLBRL7989 PKLBRN5442 PKLBRR6422 PKLBRR6423 PKLBRR6424 PKLBRR6807 PKLBRR6808 PKLBRR6809 PKLBRR6811 ### Page 4 SPECIAL INSTRUCTION NO. 112F-21 PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 4 of 6 PKLBRR6819 PKLBRR6820 PKLBRR6821 PKLBRR6834 PKLBRR6835 PKLBRR6909 PKLBRR6910 PKLBRR6912 PKLBRT7024 PKLBRU7242 PKLBRU7243 PKLBRU9998 PKLBRW8001 PKLBRW8003 PKLBRW8005 PKLBRW8006 PKLBRW8007 PKLBRW8260 PKLBRW8261 PKLBRW8262 PKLBRW8264 PKLBRW8265 PKLBRW8534 PKLBRW8536 PKLBRW8537 PKLBRW8539 PKLBRW8542 PKLBRW8543 PKLBRW8544 PKLBRW8546 PKLBRW8549 PKLBRW9160 PKLBRW9161 PKLBRW9394 PKLBRW9673 PKLBRW9675 PKLBRW9676 PKLBRW9677 PKLBRW9684 PKLBRW9685 PKLBRW9686 PKLBRW9687 PKLBRW9688 PKLBRW9689 PKLBRW9690 PKLBRX9442 PKLBRX9870 PKLBRX9871 PKLBRY9393 Table 2. HPT stage 2 Hub Serial Number. PKLBP90032 PKLBP90445 PKLBP90446 PKLBP90447 PKLBP90507 PKLBP90508 PKLBP90509 PKLBP90583 PKLBP90584 PKLBP90585 PKLBP90596 PKLBP90597 PKLBP90863 PKLBP90864 PKLBP90865 PKLBP91431 PKLBP91432 PKLBP91433 PKLBP91434 PKLBP91435 PKLBP91436 PKLBP93327 PKLBP93331 PKLBP94381 PKLBP94382 PKLBP94383 PKLBP94384 PKLBP94679 PKLBP95378 PKLBP95379 PKLBP99453 PKLBP99454 PKLBP99455 PKLBP99456 PKLBP99514 PKLBP99515 PKLBP99983 PKLBR09277 PKLBR09279 PKLBR09280 PKLBR09281 PKLBR09559 PKLBR09560 PKLBR09561 PKLBR09562 PKLBR09563 PKLBR09589 PKLBR09590 PKLBR09591 PKLBR09900 PKLBR09924 PKLBR09925 PKLBR09926 PKLBR09927 PKLBR10178 PKLBR10179 PKLBR15428 PKLBR15429 PKLBR15430 PKLBR15431 PKLBR15933 PKLBR15934 PKLBR15963 PKLBR15964 PKLBR15965 PKLBR16396 PKLBR16436 PKLBR16437 PKLBR16499 PKLBR16500 PKLBR16501 PKLBR16547 PKLBR16548 PKLBR16549 PKLBR16565 PKLBR16566 PKLBR16567 PKLBR16877 PKLBR16878 PKLBR16950 PKLBR16951 PKLBR16952 PKLBR17173 PKLBR17175 PKLBR17177 PKLBR17994 PKLBR17996 PKLBR18315 PKLBR18318 PKLBR18319 PKLBR18362 PKLBR18701 PKLBR18716 PKLBR18749 PKLBR18773 PKLBR18786 PKLBR18787 PKLBR18799 PKLBR18802 PKLBR18853 PKLBR19192 PKLBR25305 PKLBR28138 PKLBR28140 PKLBR28318 PKLBR28383 PKLBR29345 PKLBR29354 ### Page 5 SPECIAL INSTRUCTION NO. 112F-21 PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 5 of 6 PKLBR29355 PKLBR34888 PKLBR35253 PKLBR35836 PKLBR35950 PKLBR36080 PKLBR36081 PKLBR36197 PKLBR36198 PKLBR36436 PKLBR36440 PKLBR36820 PKLBR36821 PKLBR37631 PKLBR37656 PKLBR37658 PKLBR38365 PKLBR38658 PKLBR40050 PKLBR40074 PKLBR40076 PKLBR40201 PKLBR40794 PKLBR40798 PKLBR41160 PKLBR41460 PKLBR41461 PKLBR49085 PKLBR49193 PKLBR49213 PKLBR49218 PKLBR49221 PKLBR49566 PKLBR49805 PKLBR49913 PKLBR49914 PKLBR50172 PKLBR50176 PKLBR50216 PKLBR50217 PKLBR50218 PKLBR52775 PKLBR59512 PKLBR59514 PKLBR59587 PKLBR59590 PKLBR59591 PKLBR59593 PKLBR60353 PKLBR60354 PKLBR60355 PKLBR60961 PKLBR60979 PKLBR60980 PKLBR60982 PKLBR60983 PKLBR61596 PKLBR61598 PKLBR66047 PKLBR66048 PKLBR66049 PKLBR69403 PKLBR73297 PKLBR73614 PKLBR82121 PKLBR82368 PKLBR82740 PKLBR83746 PKLBR87742 PKLBR87744 PKLBR88028 PKLBR88072 PKLBR88697 PKLBR88699 PKLBR99654 PKLBR99656 PKLBR99724 PKLBR99725 PKLBR99758 PKLBR99903 PKLBR99905 PKLBRA2304 PKLBRA2306 PKLBRA2307 PKLBRA5674 PKLBRA8633 PKLBRA8634 PKLBRA8635 PKLBRA8637 PKLBRA8651 PKLBRA8652 PKLBRA8653 PKLBRA8654 PKLBRB7319 PKLBRB7321 PKLBRB7394 PKLBRB7395 PKLBRB7396 PKLBRB7397 PKLBRB7537 PKLBRB7538 PKLBRB7539 PKLBRB7540 PKLBRB7606 PKLBRB7607 PKLBRB7608 PKLBRB7609 PKLBRB7635 PKLBRB7636 PKLBRB7637 PKLBRB7638 PKLBRB7766 PKLBRB7767 PKLBRB8551 PKLBRB8552 PKLBRB8553 PKLBRB8554 PKLBRB8555 PKLBRB8590 PKLBRB8591 PKLBRB8592 PKLBRB8593 PKLBRB8602 PKLBRB8603 PKLBRB8604 PKLBRB8605 PKLBRB8715 PKLBRB8717 PKLBRB9443 PKLBRB9444 PKLBRD6708 PKLBRD6710 PKLBRE1902 PKLBRF8293 PKLBRF8295 PKLBRG9232 PKLBRM8734 PKLBRM9559 PKLBRM9739 PKLBRM9740 PKLBRM9742 PKLBRM9743 PKLBRM9992 PKLBRM9993 PKLBRM9994 PKLBRM9995 PKLBRM9996 PKLBRM9997 PKLBRM9998 PKLBRM9999 PKLBRN5328 PKLBRN5329 PKLBRN5330 PKLBRN5441 PKLBRN5443 PKLBRN5446 PKLBRN5501 PKLBRN5502 PKLBRN5917 PKLBRN6535 PKLBRN6536 PKLBRN8233 PKLBRR5012 PKLBRR9201 PKLBRT4528 PKLBRW9795 PKLBRX9063 PKLBRX9064 PKLBRX9116 PKLBRX9362 PKLBRX9365 PKLBRX9366 ### Page 6 SPECIAL INSTRUCTION NO. 112F-21 PRATT & WHITNEY PROPRIETARY - Subject to the restrictions on the first page U.S. Export Classification: EAR ECCN EAR99 Page 6 of 6 PKLBRX9703 PKLBRY9868 PKLBRY9874 PKLBRY9951 PKLBRY9952 PKLBSA9739 PKLBSB8256 PKLBSB8381 PKLBSB8383 PKLBSB9155 PKLBSB9156 PKLBSB9999 PKLBSC8029 PKLBSC8583 PKLBSC8584 PKLBSC8585 PKLBSC9668 PKLBSD9848 PKLBSD9851 PKLBSE7558 PKLBSE7560 PKLBSE8747 PKLBSE9055 PKLBSE9504 PKLBSG0341 PKLBSG0573 PKLBSG0656 PKLBSG0693 PKLBSG2210 PKLBSG4004 PKLBSG9268 PKLBSG9270 PKLBSG9828 PKLBSG9829 PKLBSH1662 MATERIAL INFORMATION: A. The material data that follows is for each engine: New P/N Qty Key Word Old P/N Instructions-Disposition Same 1 Hub 2A5001 See Hardware disposition Same 1 Hub 2A4802 See Hardware disposition B. Parts Modification Conditions Not applicable C. Spare Parts Availability (A) Contact Customer Fleet Director for spare part availability. D. Data on Interchangeable Parts Not applicable INDUSTRY SUPPORT PROGRAM Contact Customer Fleet Director for Industry Support Program details. HARDWARE DISPOSITION INSTRUCTIONS Follow instructions in NMSB 72-0713 Revision 1. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.