Parts · Rotorcraft systems

Gearbox

199 failure reports named the gearbox in the last ten years, 1,045 since 1995, most often on the Messerschmitt-Bolkow-Blohm BK 117; the condition most often found was "making metal". 94 FAA approvals let 17 companies make a replacement gearbox, Hamilton Sundstrand Corporation holding the most (24). The reports call it "gearbox", "n2 gearbox".

Reports by year

Reports by year, as a table

	reports
1995	39
1996	49
1997	51
1998	58
1999	51
2000	44
2001	63
2002	63
2003	52
2004	34
2005	32
2006	33
2007	37
2008	31
2009	34
2010	28
2011	29
2012	33
2013	33
2014	27
2015	25
2016	18
2017	13
2018	13
2019	23
2020	19
2021	33
2022	11
2023	16
2024	22
2025	22
2026	9

Which system the reports file it under last ten years

Rotorcraft systems81Engine74Flight controls20Heating, ice protection and utility systems15Airframe structure5Landing gear3Emergency equipment1

Reports by system, as a table

	reports
Rotorcraft systems	81
Engine	74
Flight controls	20
Heating, ice protection and utility systems	15
Airframe structure	5
Landing gear	3
Emergency equipment	1

Models most often reporting it last ten years

Messerschmitt-Bolkow-Blohm BK 11736Boeing 73717Boeing 75711Bombardier CL-600 Challenger and CRJ9Cessna 680 Citation Sovereign and Latitude9Airbus Helicopters EC 130 now H1307Airbus Helicopters EC-135 now H1357Bell 4077Diamond Aircraft DA 42 Twin Star6Agusta Aerospace Corp AW1395Boeing 7675Sikorsky S-925

Models most reported, as a table

	reports
Messerschmitt-Bolkow-Blohm BK 117	36
Boeing 737	17
Boeing 757	11
Bombardier CL-600 Challenger and CRJ	9
Cessna 680 Citation Sovereign and Latitude	9
Airbus Helicopters EC 130 now H130	7
Airbus Helicopters EC-135 now H135	7
Bell 407	7
Diamond Aircraft DA 42 Twin Star	6
Agusta Aerospace Corp AW139	5
Boeing 767	5
Sikorsky S-92	5

How it failed the condition found, last ten years

making metal46failed24corroded17cracked10leaking10inoperative9damaged7warning light5worn5binding4

Conditions found, as a table

	reports
making metal	46
failed	24
corroded	17
cracked	10
leaking	10
inoperative	9
damaged	7
warning light	5
worn	5
binding	4

Engines most often reporting it

Pratt & Whitney Canada PW306D1 10Austro Engine E4P(series 4CFM International CFM56-7B20 4Lycoming O-360-J2A 4Pratt & Whitney PW2037 4Turbomeca (Safran) ARRIEL 2B1 4Allison (Rolls-Royce) 250-C47B 3CFM International LEAP-1B28 series 3CFM International CFM56-7B27/B3 2CFM International CFM56 series 2

Approved replacement parts 94 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a gearbox and sell it as an approved part for the models named. These are the companies holding such approvals for a gearbox:

Hamilton Sundstrand Corporation 24Moog INC 19Honeywell International INC. 19Honeywell International INC 17Vickers INC, Electromech Division 2Ontic Engineering & Manufacturing INC 2Whippany Actuation Systems LLC 1Safe Flight Instrument CORP 1Rsg Products INC 1Moog Aircraft Group 1Lucas Western INC, Applied Technology Div 1Lucas Aerospace Equipment CORP 1Jet Avion Corporation A Heico Aerospace Company 1Imo Industries INC, Controlex Div 1Electromech Technologies 1Curtiss-Wright Flight Sys INC 1Aerocontrolex Group, Transdigm INC 1

For these models most: Boeing 787 Dreamliner (19), Bombardier CL-600 Challenger and CRJ (6), Dassault/Sud FAN JET FALCON (3), Airbus A300 (3), Mcdonnell Douglas MD-11 (1), Mcdonnell Douglas DC-10 (1), Gulfstream G-IV Gulfstream IV (1), Embraer ERJ 170 E170 and E175 (1), British Aerospace BAE 146 (1), British Aerospace AVRO 146 (1), Boeing 777 (1), Boeing 767 (1).

Maker	Part	Replaces	Fits	Granted	Status
Honeywell International INC.	Gearbox 3272564-1	3272564-1	Airbus SAS A300 B2-1A, A300 B2-1C, A300 B4-2C	2023-04-07	current
Honeywell International INC.	Gearbox 3272546-5	3272546-5	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272554-2	33272554-2	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272546-6	3272546-6	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272544-4	3272544-4	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272546-7	3272546-7	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272546-8	L922548	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272546-3	3272546-3	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272542-2	L922533	Rolls-Royce Corporation RB211-524D4-19, RB211-524D4-B-19,...	2023-03-23	current
Honeywell International INC.	Gearbox 3272626-1	3272626-1	Rolls-Royce... RB211-524H-36	2023-03-22	current
Honeywell International INC.	Gearbox 121186-4	121186-4	Rolls-Royce Corporation RB211-22B-02, RB211-524B-02, RB211-524B3-02	2023-03-21	current
Honeywell International INC.	Gearbox 121200-7	121200-7	Rolls-Royce Corporation RB211-22B-02, RB211-524B-02, RB211-524B3-02	2023-03-21	current
Honeywell International INC.	Gearbox 121404-8	9129M18P02	General Electric Company CF6-6D, CF6-6D1, CF6-6D1A	2023-03-20	current
Honeywell International INC.	Gearbox 121406-10	9129M18P15	General Electric Company CF6-6D, CF6-6D1, CF6-6D1A	2023-03-20	current
Honeywell International INC.	Gearbox 121594-12	9153M25P01	General Electric Company CF6-50A, CF6-50C, CF6-50CA	2023-03-10	current
Honeywell International INC.	Gearbox 121278-4	9033M27P05	General Electric Company CF6-50A, CF6-50C, CF6-50CA	2023-03-10	current
Honeywell International INC.	Gearbox 121386-6	9153M26P01	General Electric Company CF6-50A, CF6-50C, CF6-50CA	2023-03-10	current
Honeywell International INC.	Gearbox 121276-4	9041M54P04	General Electric Company CF6-50A, CF6-50C, CF6-50CA	2023-03-10	current
Honeywell International INC.	Gearbox 121174-1-1	121174-1-1	The Boeing Company 747-100 Series	2023-02-02	current
Rsg Products INC	Gearbox Assembly 09BL224200001-01	09BL224200001-01	Bell 412EP	2020-10-07	current
Jet Avion Corporation A Heico Aerospace Company	Gearbox Assy - Spur, Gearbox RD70R077	Pratt & Whitney P/N 70R077	Pratt & Whitney... PW4050, PW4052, PW4056	2020-07-14	current
Moog INC	Gearbox P688A0001-01	P688A0001-01	Boeing 787-10	2018-03-12	current
Moog INC	Gearbox P668A0001-05	P668A0001-05	Boeing 787-8, 787-9, 787-10	2018-03-12	current
Moog INC	Gearbox, Offset P694A0001-00	P6940001-00	Boeing 787-10	2018-03-12	current
Moog INC	Gearbox P678A0001-01	P678A0001-01	Boeing 787-10	2018-02-08	current
Moog INC	Gearbox P698A0001-01	P698A0001-01	Boeing 787-10	2018-02-08	current
Moog INC	Gearbox P681A0001-01	P681A0001-01	Boeing 787-10	2018-02-08	current
Moog INC	Gearbox P693A0001-01	P693A0001-01	Boeing 787-10	2018-02-08	current
Moog INC	Gearbox P669A0001-01	P669A0001-01	Boeing 787-10	2018-02-08	current
Moog INC	Gearbox P695A0001-01	P695A0001-01	Boeing 787-10	2018-02-08	current
Hamilton Sundstrand Corporation	Gearbox, External 7007042	7007042	Rolls-Royce Trent1000-AE3, Trent1000-CE3, Trent1000-D3	2017-10-29	current
Hamilton Sundstrand Corporation	Gearbox, External 7007042A	7007042A	Rolls-Royce Trent1000-AE3, Trent1000-CE3, Trent1000-D3	2017-10-29	current
Hamilton Sundstrand Corporation	Gearbox, External 7007042A	7007042A	Rolls-Royce Trent1000-AE3, Trent1000-CE3, Trent1000-D3	2017-10-29	current
Hamilton Sundstrand Corporation	Gearbox, External 7007042	7007042	Rolls-Royce Trent1000-AE3, Trent1000-CE3, Trent1000-D3	2017-10-29	current
Moog INC	Gearbox, Offset P681A0001-01	P681A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Offset P694A0001-00	P694A0001-00	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P698A0001-01	P698A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Offset P675A0001-01	P675A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P678A0001-01	P678A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P688A0001-01	P688A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P695A0001-01	P695A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P699A0001-01	P699A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Offset P677A0001-01	P677A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Moog INC	Gearbox, Angle P693A0001-01	P693A0001-01	Boeing 787-8, 787-9	2014-09-01	current
Hamilton Sundstrand Corporation	Gearbox, External 7000147J	7000147J	Rolls-Royce plc Trent 1000-A, Trent 1000-C, Trent 1000-D	2013-12-03	current
Whippany Actuation Systems LLC	Gearbox R1141	S141T491-1	The Boeing Company 767-200 Series, 767-300 Series,...	2013-09-03	current
Hamilton Sundstrand Corporation	Gearbox, Engine Mounted 7000147H	7000147H	Rolls-Royce TRENT1000-A, TRENT1000-C, TREBT1000-D	2011-08-28	current
Hamilton Sundstrand Corporation	Gearbox, External 7000147G	7000147	Rolls-Royce TRENT1000-A, TRENT1000-C, TRENT1000-D	2011-03-02	current
Hamilton Sundstrand Corporation	Gearbox, Angle Flap 768614	768614	Bombardier CL-600-2E25 (Regional Jet Series...	2011-01-03	current
Hamilton Sundstrand Corporation	Gearbox, Angle Flap 766381	766381	Bombardier CL-600-2E25 (Regional Jet Series...	2011-01-03	current
Hamilton Sundstrand Corporation	Gearbox, Angle Slat 766377	766377	Bombardier CL-600-2E25 (Regional Jet Series...	2011-01-03	current
Hamilton Sundstrand Corporation	Gearbox, Angle Flap 766379	766379	Bombardier CL-600-2E25 (Regional Jet Series...	2011-01-03	current
Honeywell International INC	Gearbox, ballscrew & interlock 3272544-6	3272544-6	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2008-01-10	current
Honeywell International INC	Gearbox, ballscrew 3272542-4	3272542-4	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2008-01-10	current
Honeywell International INC	Gearbox, pneumatic interlock 3272626-3	3272626-3	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2008-01-10	current
Honeywell International INC	Gearbox, pneumatic interlock 3272546-10	3272546-10	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2008-01-10	current
Honeywell International INC	Gearbox, pneumatic interlock 3272626-3	3272626-3	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2007-12-10	current
Honeywell International INC	Gearbox, ballscrew & interlock 3272544-6	3272544-6	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2007-12-10	current
Honeywell International INC	Gearbox, pneumatic interlock 3272546-10	3272546-10	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2007-12-10	current
Honeywell International INC	Gearbox, ballscrew 3272542-4	3272542-4	Rolls-Royce RB211 524D4-19, RB211 524D4-B-19,...	2007-12-10	current
Hamilton Sundstrand Corporation	Gearbox Assy - Main 1709278C	Pratt & Whitney P/N 5702680	Engine Alliance GP7270, GP7277	2007-11-12	current
Ontic Engineering & Manufacturing INC	Gearbox, Cargo Door Actuation System 21187-000	672943-101	Lockheed L-1011-385-1, L-1011-385-1-14,...	2007-05-14	current
Hamilton Sundstrand Corporation	Gearbox Assy - Accessory 1706183B	Pratt & Whitney P/N 5702437	Pratt & Whitney Engine Alliance GP7270, GP7277	2006-12-12	current
Hamilton Sundstrand Corporation	Gearbox Assy - Main 1709278A	Pratt & Whitney P/N 5702362	Pratt & Whitney Engine Alliance GP7270, GP7277	2006-12-12	current
Hamilton Sundstrand Corporation	Gearbox Assy - Accessory 1706183B	Pratt & Whitney P/N 5702437	Pratt & Whitney Engine Alliance GP7270, GP7277	2006-10-15	current
Hamilton Sundstrand Corporation	Gearbox Assy - Main 1709278A	Pratt & Whitney P/N 5702362	Pratt & Whitney Engine Alliance GP7270, GP7277	2006-10-15	current
Ontic Engineering & Manufacturing INC	Gearbox, Cargo Door Actuation System 21187-000	672943-101	Lockheed L-1011-385-1, L-1011-385-1-14,...	2006-08-31	current
Hamilton Sundstrand Corporation	Gearbox Assembly - Main 770366J	Pratt and Whitney 5407242	Pratt & Whitney PW6124A, PW6122A	2006-04-30	current
Hamilton Sundstrand Corporation	Gearbox Assembly - Main, Module 770421K	Pratt and Whitney 5408275	Pratt & Whitney PW6124A, PW6122A	2006-04-30	current
Hamilton Sundstrand Corporation	Gearbox Assembly - Main, Module 770421K	Pratt and Whitney 5408275	Pratt & Whitney PW6124A, PW6122A	2006-04-30	current
Hamilton Sundstrand Corporation	Gearbox Assembly - Main 770366J	Pratt and Whitney 5407242	Pratt & Whitney PW6124A, PW6122A	2006-04-30	current
Hamilton Sundstrand Corporation	Gearbox Assy - Main 770366J	Pratt & Whitney 5407242	Pratt & Whitney PW6122A, PW6124A	2006-01-30	current
Hamilton Sundstrand Corporation	Gearbox Assembly, Main Module 770421J	Pratt & Whitney 5407325	Pratt & Whitney PW6124A	2005-02-10	current
Hamilton Sundstrand Corporation	Gearbox - Slat Angle (137) 1700599	Embraer Empresa P/N 170-32502-804	Embraer Empresa ERJ 170-100 STD ERJ 170-100 LR	2004-07-14	current
Honeywell International INC	Gearbox, lock 3272546-9	3272546-9	Rolls-Royce RB211 524D4-19, 524D4-B-19, 524D4X-19	2001-02-21	current
Safe Flight Instrument CORP	Gearbox Assembly 3001-1		Lockheed L-1011-385 Series	1998-12-02	current
Curtiss-Wright Flight Sys INC	Gearbox Assembly 184186-1	S141W721-1	Boeing 777-200, 777-300	1998-07-12	current
Electromech Technologies	Gearbox Assembly, Flap Drive Electromech EM508	Beech Aircraft 100-524074-1	Beech Raytheon) (200CT S/N BN-1. B200 S/N...	1997-12-28	current
Vickers INC, Electromech Division	Gearbox/Brake 1089D100-2	Flight Structures, Inc. 1089D100-2	Airbus A300B4-103/203	1997-11-12	current
Vickers INC, Electromech Division	Gearbox/Brake 1089D100-1	Flight Structures, Inc. 1089D100-1	Airbus A300B4-103/203	1997-11-12	current
Lucas Aerospace Equipment CORP	Gearbox, Cargo Door 21187-000	Lockheed 672943-101	Lockheed L1011-385-1, -1-14, -1-15	1997-05-18	current
Honeywell International INC	Gearbox, pinion 121468-4-1	Dassault 121468-4-1	Dassault Aviation Fan Jet Falcon, Series C, D	1997-04-13	current
Honeywell International INC	Gearbox, spur drive 121578-1-1	121578-1-1	Dassault Aviation Fan Jet Falcon, Series C, D	1997-04-13	current
Honeywell International INC	Gearbox, pinion 121468-3-1	Dassault 121468-3-1	Dassault Aviation Fan Jet Falcon, Series C, D	1997-04-13	current
Aerocontrolex Group, Transdigm INC	Gearbox Assembly 2100140-007	Canadair 2100140-007	Bombardier, Inc. CL600-2A12, 2B16, 2B19	1996-10-15	current
Moog Aircraft Group	Gearbox, Central 541970-1-1, -2-1,	Gulfstream Aerospace 1159SCC210-1, -2	Gulfstream GII, GIIB, GIII	1996-04-18	current
Hamilton Sundstrand Corporation	Gearbox, Adapter, Gen. 728403D	AVRO 728403D	British Aerospace BAe 146-100A, -200A, -300A	1995-03-26	current
Imo Industries INC, Controlex Div	Gearbox Assembly 2100140-003	Canadair 228-58212-103	Bombardier, Inc. CL-600-2B19 (Regional Jet Series...	1993-06-24	current
Honeywell International INC	Gearbox 121276-4	G.E. 9041M54P04	General Electric CF6-6, -50	1992-08-06	current
Honeywell International INC	Gearbox 121386-6	G.E. 9153M26P01	General Electric CF6-6, -50	1992-08-06	current
Honeywell International INC	Gearbox 121594-12	G.E. 9153M25P01	General Electric CF6-6, -50	1992-08-06	current
Honeywell International INC	Gearbox 121404-8	G.E. 9129M18P02	General Electric CF6-6	1992-08-06	current
Honeywell International INC	Gearbox 121406-10	G.E. 9039M44P15	General Electric CF6-6	1992-08-06	current
Lucas Western INC, Applied Technology Div	Gearbox Assembly 42164R13	McDonnell Douglas 42164R13	McDonnell Douglas DC-10-10, -10F, -15	1992-02-19	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.