The component layer · parts · FAA feed as of October 12, 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
Fuel Line	Engine	121	425	87	11
Extinguisher	Emergency equipment	121	319	22	4
Oxygen Box	Emergency equipment	120	140	595	16
Uplock Switch	Landing gear	119	647	1	1
Toilet	Cabin, seats and restraints	119	155	267	8
Step	Airframe structure	118	795	56	24
Firewall	Airframe structure	118	614	163	14
Solenoid Valve	Engine	118	396	94	30
Torque Box	Airframe structure	118	354
Rudder	Airframe structure	117	278	74	16
Bypass Valve	Heating, ice protection and utility systems	116	376	35	11
Retaining Clip	Cabin, seats and restraints	116	219	23	7
Pcb	Airframe structure	116	183	43	11
Closeout Panel	Airframe structure	116	172	49	18
Roller Tray	Airframe structure	115	268	884	10
Magneto	Engine	114	734	826	6
Drive Unit	Instruments and avionics	114	250	158	13
Washer	Airframe structure	113	342	5,574	269
Blades	Engine	111	383
Axle	Landing gear	109	455	189	31
Case	Engine	106	521	276	18
Autoland Sys	Flight controls	105	163
Feeder Cable	Electrical power	104	687
Sense Line	Heating, ice protection and utility systems	104	260	76	1
Sidewall Panel	Airframe structure	104	134	614	12
Thermocouple	Engine	102	197	144	17
Aileron	Airframe structure	101	442	73	9
Spar Web	Airframe structure	101	269
Precooler	Heating, ice protection and utility systems	99	243	88	7
Monitor	Engine	98	277	212	21
Chiller	Cabin, seats and restraints	97	215	67	10
Carbon Seal	Engine	96	579	9	6
Control Rod	Airframe structure	96	337	92	16
Container	Cabin, seats and restraints	96	293	180	25
Seat Back	Cabin, seats and restraints	96	161	194	19
Aoa	Instruments and avionics	96	121
Brace	Airframe structure	95	368	141	42
Not Entered	Airframe structure	95	95
Linkage	Airframe structure	94	372	43	14
Chip Detector	Engine	94	369	102	15
Riser	Airframe structure	94	194	102	8
Fuel Cell	Fuel system	93	452	500	10
Alternator	Electrical power	92	595	663	17
Downlock Switch	Landing gear	91	550
Deu	Airframe structure	91	124
Control Box	Landing gear	90	637	91	21
Support Strap	Airframe structure	90	98	4	2
Boot	Heating, ice protection and utility systems	89	426	154	37
Powerpack	Electrical power	89	292	2	1
Converter	Engine	89	273	57	24
Service Door	Airframe structure	89	154	12	5
Skirt	Cabin, seats and restraints	89	94	37	8
Anti Skid	Landing gear	88	229	26	8
Pitot Head	Instruments and avionics	88	195	2	1
Tray	Airframe structure	88	153	660	84
Fmu	Engine	87	250	11	1
Support Web	Airframe structure	87	92
Torque Link	Landing gear	85	297	52	5
Warning Horn	Instruments and avionics	85	290
Bumper	Airframe structure	85	128	374	59
Cylinder Head	Engine	84	532	17	9
Lavatory	Cabin, seats and restraints	84	119	3,462	11
Drain Valve	Cabin, seats and restraints	83	234	197	45
Drain Line	Airframe structure	83	230	9	4
Pad	Airframe structure	83	209	537	62
Outlet	Electrical power	83	108	146	30
Relief Valve	Heating, ice protection and utility systems	82	366	163	36
Radio	Instruments and avionics	82	267	3	3
Isolation Valve	Heating, ice protection and utility systems	82	254	40	11
Condenser	Heating, ice protection and utility systems	82	150	28	9
Fuel Nozzle	Engine	81	255	207	19
Buttstrap	Airframe structure	80	476	8	4
Pbe	Cabin, seats and restraints	80	289	1	1
Belt	Rotorcraft systems	80	273	32	14
Trim Motor	Flight controls	80	155
Plenum	Heating, ice protection and utility systems	79	148	228	40
Light Sys	Electrical power	79	79
Bpsu	Flight controls	78	821
Oil Filter	Engine	78	364	231	36
Exhaust Pipe	Engine	78	225	11	6
Pressure Web	Airframe structure	78	132
Selector	Heating, ice protection and utility systems	77	353	103	16
Safety Valve	Landing gear	77	140	55	11
Pintle Pin	Airframe structure	77	77
Coaming	Airframe structure	76	77
Spoiler Sys	Flight controls	75	161
Rotor	Engine	74	333	270	44
Servo Valve	Landing gear	74	216	44	10
Limiter	Flight controls	74	209	16	6
Sealant	Airframe structure	74	183	165	9
Egt Indication	Engine	74	94
Nozzle	Engine	73	521	706	74
Muffler	Engine	73	280	452	28
Cover Plate	Airframe structure	73	131	230	81
Acoustic Panel	Airframe structure	73	129	11	1
Priority Valve	Landing gear	72	386	17	5
Service Panel	Airframe structure	71	129	12	7
Drain Mast	Airframe structure	71	124	73	18
Threshold Web	Airframe structure	71	74
Overheat Sensor	Emergency equipment	70	188

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.