The component layer · parts · FAA feed as of October 14, 2026

Parts

Two public FAA records meet here. The failure reports that airlines and repair shops file say which part failed, on what aircraft, and how (worn, cracked, leaking); the words they use are brought to one plain name, so "BRAKE ASSY", "Brake Assembly" and "brake" are one part. The parts manufacturer approvals say which companies may make a replacement part of that name for which models. 1,227,278 approvals held by 3,185 companies, 1,227,228 of them current. Click a part for its page; a part makers list is beside it.

Approved replacement parts by system 1,227,278 approvals

Approved parts by system, as a table

	approvals
Other and general	843,094
Cabin, seats and restraints	184,224
Airframe structure	55,196
Engine	44,658
Electrical power	40,411
Instruments and avionics	14,631
Flight controls	13,152
Landing gear	10,784
Heating, ice protection and utility systems	7,627
Emergency equipment	5,492
Propeller	2,667
Fuel system	2,663
Rotorcraft systems	2,061
Electric propulsion	618

Approvals granted by year

Approvals by year, as a table

	approvals
1990	1,112
1991	4,260
1992	11,202
1993	8,753
1994	8,945
1995	11,371
1996	10,536
1997	18,003
1998	20,081
1999	18,991
2000	21,483
2001	30,752
2002	14,589
2003	37,407
2004	24,859
2005	76,711
2006	48,067
2007	36,034
2008	37,630
2009	57,789
2010	48,738
2011	63,745
2012	74,881
2013	64,140
2014	45,366
2015	100,038
2016	50,349
2017	24,220
2018	36,125
2019	36,555
2020	23,146
2021	28,183
2022	27,634
2023	19,441
2024	14,062
2025	54,071
2026	11,539

Models with the most approved replacement parts

Boeing 737 170,491 Boeing 777 150,018 Boeing 747 139,984 Boeing 767 94,577 Boeing 757 79,216 Airbus A330 57,903 Airbus A320 36,556 Airbus A340 34,582 Airbus A321 31,770 Boeing 727 30,081 Boeing 787 Dreamliner 29,394 Airbus A319 27,080 Airbus A300 24,786 Bombardier CL-600 Challenger and CRJ 21,226 Mcdonnell Douglas DC-9 15,421

Part	Mostly in	Reports, 10 years	Reports since 1995	Approved replacements	Makers
Dual Valve	Heating, ice protection and utility systems	1	6
Lock Link	Engine	1	6	90	6
Multiplexer	Fuel system	1	6	12	9
Spar Plate	Airframe structure	1	6
Transition Duct	Airframe structure	1	6	77	14
Anticipator	Engine	1	5	2	2
Asymmetry Switch	Flight controls	1	5
Bell	Airframe structure	1	5	24	5
Bridal Cable	Flight controls	1	5
Centering Unit	Landing gear	1	5
Combining Box	Instruments and avionics	1	5
Cone Bolt	Engine	1	5	39	5
Feel Sensor	Landing gear	1	5
Idler Pulley	Electrical power	1	5	6	2
Pivot Bolt	Cabin, seats and restraints	1	5	45	8
Pivot Support	Airframe structure	1	5	1	1
Ratio Changer	Flight controls	1	5
Rim	Landing gear	1	5	7	3
Saaru	Instruments and avionics	1	5
Ski	Landing gear	1	5	18	1
Slide Block	Airframe structure	1	5	14	4
Support Rail	Airframe structure	1	5	5	2
Wye Pipe	Engine	1	5
Apr	Engine	1	4
Bearing Cover	Airframe structure	1	4	2	2
Bpu	Airframe structure	1	4
Control Latch	Landing gear	1	4
Deec	Engine	1	4	1	1
Drive Cable	Flight controls	1	4	1	1
Headphones	Cabin, seats and restraints	1	4
Locking Plate	Airframe structure	1	4	8	6
Overhead Panel	Cabin, seats and restraints	1	4	18	8
Photo Cell	Electrical power	1	4	1	1
Ram	Fuel system	1	4	8	4
Repeater	Fuel system	1	4	7	3
Siren	Cabin, seats and restraints	1	4	2	1
Stall Strip	Flight controls	1	4	8	5
Ventilator Panel	Airframe structure	1	4
Aap	Heating, ice protection and utility systems	1	3
Air Cleaner	Heating, ice protection and utility systems	1	3	22	3
Augmentor Tube	Engine	1	3
Blucket	Airframe structure	1	3
Coll Pitch	Rotorcraft systems	1	3
Collet	Cabin, seats and restraints	1	3	5	3
Cowl Fastener	Other and general	1	3
Cpu	Engine	1	3
Dead Bolt	Airframe structure	1	3	11	5
Dmu	Instruments and avionics	1	3	23	4
Friction Block	Rotorcraft systems	1	3
Intermed Gearbox	Rotorcraft systems	1	3
Roller Pin	Landing gear	1	3	1	1
Synchrophaser	Propeller	1	3	17	2
Test Light	Cabin, seats and restraints	1	3
Tether	Cabin, seats and restraints	1	3	5	2
Ventral Fin	Airframe structure	1	3	2	2
Voice Recorder	Instruments and avionics	1	3
Adapter Ring	Instruments and avionics	1	2	10	6
Collective	Rotorcraft systems	1	2
Condesor	Heating, ice protection and utility systems	1	2
Contact Breaker	Engine	1	2
Dispenser	Cabin, seats and restraints	1	2	20	5
Efi	Instruments and avionics	1	2
Emitter	Engine	1	2
Engine Vane	Engine	1	2
Extension Sys	Landing gear	1	2
Fdas	Airframe structure	1	2
Fly Wire	Landing gear	1	2
Friction Pad	Rotorcraft systems	1	2
Girt Lacing	Cabin, seats and restraints	1	2
Heated Lip	Heating, ice protection and utility systems	1	2
Impact Switch	Electrical power	1	2	5	3
Integrated	Engine	1	2
Paper	Airframe structure	1	2	94	5
Ptt Button	Emergency equipment	1	2
Purge Can	Fuel system	1	2
Selcal	Engine	1	2	5	1
Shift Mechanism	Flight controls	1	2
Slide Bar	Cabin, seats and restraints	1	2
Sync Shaft	Rotorcraft systems	1	2
Toilet Seat	Cabin, seats and restraints	1	2	151	9
Ulb	Instruments and avionics	1	2
Uplock Pin	Landing gear	1	2
Vartoms	Rotorcraft systems	1	2
Vortilon	Airframe structure	1	2	15	3
Abs	Other and general	1	1	12	1
Averaging Unit	Emergency equipment	1	1
Barlock	Airframe structure	1	1
Bcu	Landing gear	1	1	1	1
Bleed Port	Landing gear	1	1
Break Over	Cabin, seats and restraints	1	1	4	1
Cabin Camera	Cabin, seats and restraints	1	1
Cabin Cooling	Heating, ice protection and utility systems	1	1
Cable Sheath	Cabin, seats and restraints	1	1
Cam Nut	Cabin, seats and restraints	1	1
Cargo Load	Cabin, seats and restraints	1	1	6	2
Cdc	Electrical power	1	1	14	1
Dado Panel	Airframe structure	1	1	634	3
Demo Mask	Cabin, seats and restraints	1	1
Drive Bearing	Engine	1	1
Droop Unit	Flight controls	1	1

Sources: the FAA's service difficulty reports (1995 to date; the part name as the reporter wrote it, reduced to its first plain words) and the FAA's parts manufacturer approvals from the Dynamic Regulatory System. A report counts a part that failed and was fixed; it does not say how many of that part are flying, so a common part on a big fleet is reported more. "Unknown" and blank names are left out.