Pinion Gear
15 failure reports named the pinion gear in the last ten years, 93 since 1995, most often on the Boeing 787 Dreamliner; the condition most often found was "corroded". 14 FAA approvals let 9 companies make a replacement pinion gear, Spirit Aerosystems INC holding the most (2).
Reports by year
Reports by year, as a table
| reports | |
|---|---|
| 1995 | 2 |
| 1996 | 1 |
| 1997 | 2 |
| 1998 | 2 |
| 1999 | 4 |
| 2000 | 9 |
| 2001 | 8 |
| 2002 | 10 |
| 2003 | 14 |
| 2004 | 5 |
| 2005 | 2 |
| 2006 | 3 |
| 2007 | 3 |
| 2008 | 3 |
| 2009 | 2 |
| 2010 | 3 |
| 2011 | 2 |
| 2012 | 1 |
| 2013 | 1 |
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 1 |
| 2021 | 1 |
| 2023 | 5 |
| 2024 | 1 |
| 2025 | 3 |
Which system the reports file it under last ten years
Reports by system, as a table
| reports | |
|---|---|
| Flight controls | 6 |
| Rotorcraft systems | 5 |
| Airframe structure | 3 |
| Engine | 1 |
Models most often reporting it last ten years
How it failed the condition found, last ten years
Conditions found, as a table
| reports | |
|---|---|
| corroded | 8 |
| failed | 2 |
| worn | 2 |
| damaged | 1 |
| flaking | 1 |
| spalled | 1 |
Engines most often reporting it
Approved replacement parts 14 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a pinion gear and sell it as an approved part for the models named. These are the companies holding such approvals for a pinion gear:
For these models most: Boeing 757 (6), Boeing 737 (4), Boeing 727 (4), Boeing 707 (4), Mcdonnell Douglas DC-9 (1), Mcdonnell Douglas Aircraft Co MD-88 (1), Douglas DC-8 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Aviation Materials Management, INC | Pinion Gear 251N5089-6 | 251N5089-6 | Boeing 757-200 Series, 757-300 Series | 2015-02-12 | current |
| Aviation Materials Management, INC. | Pinion Gear 251N5089-6 | 251N5089-6 | Boeing 757-200 Series, 757-300 Series | 2014-09-04 | current |
| Aviation Materials Management INC | Pinion Gear 251N5089-6 | 251N5089-6 | Boeing 757-200 Series, 757-300 Series | 2013-03-24 | current |
| Roush Industries INC | Pinion Gear Assembly - Supercharger Planet RA-D12378 | DA.2378, 615436 | Packard Rolls-Royce V-1650-3, V-1650-7 Merlin 68 | 2011-03-08 | current |
| Roush Industries INC | Pinion Gear - Supercharger Planet RA-D12376 | DA.2376, 615437 | Packard Rolls-Royce V-1650-3, V-1650-7 Merlin 68 | 2011-03-08 | current |
| Aviation Materials Management INC | Pinion Gear 251N5089-6 | 251N5089-6 | Boeing 757-200 Series, 757-300 Series | 2010-08-08 | current |
| Spirit Aerosystems INC | PINION GEAR 251N5088-6 | 251N5088-6 | Boeing 757-200 SERIES, 757-300 SERIES | 2009-06-14 | current |
| Spirit Aerosystems INC | PINION GEAR 251N5089-6 | 251N5089-6 | Boeing 757-200 SERIES, 757-300 SERIES | 2009-06-14 | current |
| Adpma LLC | Pinion Gear, Bevel Power Takeoff Accessry Drive PMA72051-1 | General Electric 5016T71P01 | General Electric CF34-3A1 & 3B1 | 2004-02-12 | current |
| Adpma LLC | Pinion Gear, Bevel Power Takeoff Accessry Drive PMA72051-2 | General Electric 5016T71P02 | General Electric CF34-3A1 & 3B1 | 2004-02-12 | current |
| Tara Technology Corporation, C/O G&N Rubicon Gear INC | Pinion Gear 350581TTC | AC350581 | Boeing 707-100B Long Body, -100B Short Body, -300B | 2000-01-31 | current |
| Aero Certification Services LLC, C/O Sungear INC | Pinion Gear 350581AC | Aero Certification Services AC350581 | Boeing 707-100B Long Body, 707-100B Short... | 1999-01-14 | current |
| Aero Certification Services LLC, C/O Sungear INC | Pinion Gear AC350581 | AlliedSignal 350581 | Boeing 707-100B Long Body, -100B Short... | 1998-03-29 | current |
| Aero Certification Services LLC, C/O Gerhardt Gear CO | Pinion Gear AC350581 | AlliedSignal 350581 | Boeing 707, 720, 727 | 1997-05-13 | current |
Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.