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
Leaf Spring	Cabin, seats and restraints	30	55	56	7
Thrust Link	Engine	30	51	11	3
Guide Plate	Airframe structure	30	37	58	13
Locking Cam	Cabin, seats and restraints	30	30
Casting	Airframe structure	29	559	37	10
Control System	Flight controls	29	223	4	3
Garlock Seal	Engine	29	129
Crank	Airframe structure	29	91	137	23
Radio Altimeter	Instruments and avionics	29	62	1	1
Tail Boom	Airframe structure	29	58	8	3
Stub Beam	Airframe structure	29	38	18	1
Expansion Joint	Airframe structure	29	33	2	1
Crankcase	Engine	28	365	52	5
Signal Cond	Engine	28	200	3	1
Elbow	Heating, ice protection and utility systems	28	182	809	60
Shear Pin	Airframe structure	28	131	86	15
Portable Light	Electrical power	28	115
Hanger	Cabin, seats and restraints	28	89	76	28
Windshield Wiper	Heating, ice protection and utility systems	28	84	1	1
Sight Glass	Cabin, seats and restraints	28	52	5	4
Strake	Airframe structure	28	36	104	6
Mau	Instruments and avionics	28	35
Drip Tray	Airframe structure	28	34	5	2
Support Rod	Airframe structure	28	34	6	2
Table	Cabin, seats and restraints	28	31	52	17
Fireshield	Airframe structure	27	163	9	2
Downlock Sensor	Landing gear	27	146
Compressor Blade	Engine	27	90	28	2
Stinger	Airframe structure	27	40	47	4
Warning Unit	Instruments and avionics	27	38
Audio Panel	Instruments and avionics	26	218	7	4
Impeller	Fuel system	26	130	148	25
Intake	Engine	26	90
Grommet	Airframe structure	26	78	547	65
Printer	Cabin, seats and restraints	26	70	124	16
Longeron Fitting	Airframe structure	26	61
Shackle	Airframe structure	26	36	10	9
Assist Handle	Airframe structure	26	26	56	8
Switchpack	Engine	26	26	1	1
Membrane	Airframe structure	25	397
Carriage	Airframe structure	25	332	46	12
Potentiometer	Landing gear	25	264	47	22
Uplock Sensor	Landing gear	25	247
Turbine Wheel	Engine	25	225	17	6
Pitot Line	Instruments and avionics	25	186
Printed Ckt	Electrical power	25	116	5	2
Detection Sys	Emergency equipment	25	99
Seat Frame	Cabin, seats and restraints	25	83	5	3
Flex Hose	Heating, ice protection and utility systems	25	71	61	7
Shimmy Dampener	Landing gear	25	63	2	2
Keyboard	Instruments and avionics	25	60	135	10
Metering Unit	Engine	25	60	24	2
Elevator System	Flight controls	25	50	15	1
Stop Pin	Airframe structure	25	50	21	9
Waste Tank	Cabin, seats and restraints	25	33	98	18
Fire Seal	Airframe structure	25	31	214	19
Damper Plate	Airframe structure	25	26
Flag	Airframe structure	25	25
Amplifier	Instruments and avionics	24	405	51	19
Clutch	Rotorcraft systems	24	189	7	6
Tank	Fuel system	24	176	111	27
Ejector	Heating, ice protection and utility systems	24	143	44	13
Filter Element	Engine	24	122	2,000	42
Bellows	Heating, ice protection and utility systems	24	111	121	38
Shuttle Valve	Landing gear	24	104	24	11
Erosion Shield	Airframe structure	24	78	52	8
Ptu	Heating, ice protection and utility systems	24	71
Intake Valve	Engine	24	65	3	2
Trigger	Airframe structure	24	42	52	11
Microwave Oven	Cabin, seats and restraints	24	37	24	5
Concentrator	Engine	24	35	4	2
Reheater	Heating, ice protection and utility systems	24	33	9	4
Sliding Sleeve	Airframe structure	24	29
Cascade	Engine	24	28	86	3
Beltframe	Airframe structure	23	333
Schrader Valve	Airframe structure	23	91
Pressure System	Heating, ice protection and utility systems	23	54	1	1
Bonding Wire	Airframe structure	23	37
Windshear Sys	Instruments and avionics	23	26
Assist System	Airframe structure	23	23
Gyro	Instruments and avionics	22	852
Crankshaft	Engine	22	408	121	7
Trim Tab	Flight controls	22	196	26	10
Throttle Cable	Engine	22	191	44	10
Spark Plug	Engine	22	178	119	11
Lap Joint	Airframe structure	22	154
Resistor	Electrical power	22	146	34	14
Scavenge Pump	Engine	22	135	36	10
Bar	Airframe structure	22	94	54	30
Separator	Engine	22	94	74	26
Fillet	Airframe structure	22	76	4	2
Vertical Support	Airframe structure	22	70	10	4
Stringer Fitting	Airframe structure	22	40
Galley	Cabin, seats and restraints	22	32	3,905	37
Chine	Airframe structure	22	23	2	1
Floor Mat	Airframe structure	22	23	157	1
Mec	Engine	21	122
Retaining Ring	Engine	21	69	92	40
Landing Light	Electrical power	21	59	148	32
Bpcu	Electrical power	21	55	4	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.