The component layer · parts · FAA feed as of October 13, 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
Hpc	Engine	16	16
Riser Panel	Airframe structure	16	16	20	2
Float	Engine	15	304	147	27
Coil	Engine	15	144	60	16
Symbol Generator	Instruments and avionics	15	131	5	2
Power Lever	Engine	15	103	3	2
Pinion Gear	Flight controls	15	93	14	9
Selector Panel	Heating, ice protection and utility systems	15	93	2	1
Steering Unit	Landing gear	15	65
Mixing Valve	Heating, ice protection and utility systems	15	52	14	4
Recorder	Instruments and avionics	15	49
Audio Control	Instruments and avionics	15	42	52	7
Exhaust Riser	Engine	15	38	8	2
Overheat Sys	Emergency equipment	15	25
Vortex Gen	Airframe structure	15	22
Extractor	Heating, ice protection and utility systems	15	20	6	3
Fill Port	Airframe structure	15	20	1	1
Avionics Unit	Instruments and avionics	15	19
Cargo	Airframe structure	15	17	13	7
Fanwheel	Rotorcraft systems	15	16
Baffle Angle	Airframe structure	15	15
Brushes	Electrical power	14	271
Camshaft	Engine	14	208	78	8
Swivel	Landing gear	14	141	99	20
Turbocharger	Engine	14	135	342	5
Wheel Half	Landing gear	14	94	58	2
Pickup	Rotorcraft systems	14	76	3	3
Air Box	Engine	14	75	19	6
Cone	Engine	14	73	644	26
Pitch Control	Flight controls	14	73	13	6
Stator Vane	Engine	14	72	7	4
Transfer Tube	Engine	14	58	24	8
Ramp	Airframe structure	14	48	21	9
Resolver	Engine	14	46	5	4
Rocker	Engine	14	45	7	5
Support Arm	Airframe structure	14	27	19	8
Brake Pads	Landing gear	14	26
Ufi	Fuel system	14	23
Diverter	Engine	14	20	8	3
Trans Rectifier	Electrical power	14	17
Enclosure	Cabin, seats and restraints	14	14	82	25
Pec	Propeller	14	14
Position Unit	Instruments and avionics	14	14
Track Splice	Airframe structure	14	14
View Port	Cabin, seats and restraints	14	14	2	2
Forging	Airframe structure	13	218	25	11
Cooler	Electrical power	13	135	110	15
Mast	Rotorcraft systems	13	101	8	6
Points	Engine	13	90
Secu	Flight controls	13	90
Downlock	Landing gear	13	86	10	5
Timer	Heating, ice protection and utility systems	13	77	75	17
Fluid	Heating, ice protection and utility systems	13	75
Entertain Sys	Instruments and avionics	13	65
Grip	Airframe structure	13	64	78	9
Amu	Instruments and avionics	13	48	11	5
Tie Rod	Airframe structure	13	38	346	48
Partition	Airframe structure	13	34	125	20
Pinion	Airframe structure	13	32	32	13
Torsion Bar	Airframe structure	13	32	3	3
Release Pin	Airframe structure	13	30	9	2
Ditching Dam	Cabin, seats and restraints	13	29	10	2
Bayonet	Airframe structure	13	22	16	6
Instrument Panel	Instruments and avionics	13	22	184	39
Lock Fastener	Airframe structure	13	22
Defibrillator	Cabin, seats and restraints	13	21
Magnetic Plug	Engine	13	20	4	2
Dfgs	Flight controls	13	16
Crash Axe	Cabin, seats and restraints	13	13
Memory Device	Flight controls	13	13	3	1
Gasper Fan	Heating, ice protection and utility systems	12	206
Exhaust Stack	Engine	12	202	147	16
Cvr	Instruments and avionics	12	140	50	2
Aspirator	Cabin, seats and restraints	12	100	4	3
Ball Joint	Airframe structure	12	92	15	5
Selector Switch	Cabin, seats and restraints	12	71	2	1
Jam Nut	Airframe structure	12	41	22	9
Duct Clamp	Heating, ice protection and utility systems	12	36
Collector	Engine	12	34	167	15
Actuator Valve	Fuel system	12	32	27	3
Buffer	Airframe structure	12	26	13	7
Medical	Cabin, seats and restraints	12	25
Detector Loop	Emergency equipment	12	24
Evaporator	Heating, ice protection and utility systems	12	24	29	5
Master Caution	Instruments and avionics	12	18	6	4
Seat Spring	Airframe structure	12	14	12	4
Sheave	Rotorcraft systems	12	14	5	2
Ball Mat	Airframe structure	12	13	285	4
Lru	Flight controls	12	13	158	16
Emer Light	Electrical power	12	12	1	1
Accessory Unit	Heating, ice protection and utility systems	11	284	211	2
Uplock Hook	Landing gear	11	68
Card	Instruments and avionics	11	63	3	1
Reflector	Cabin, seats and restraints	11	60	52	12
Combust Chamber	Engine	11	57
Insulator	Airframe structure	11	50	206	39
Safety Switch	Landing gear	11	50
Control Tube	Rotorcraft systems	11	48	1	1
Dipstick	Engine	11	45	1	1
Dump Valve	Landing gear	11	41	5	5

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.