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
Knob	Cabin, seats and restraints	204	342	294	47
Life Raft	Cabin, seats and restraints	204	293	15	5
Sleeve	Engine	203	623	1,957	177
Blower	Heating, ice protection and utility systems	201	557	77	20
Gearbox	Rotorcraft systems	199	1,045	94	17
Psu	Cabin, seats and restraints	197	310	690	12
Slider	Airframe structure	197	249	211	39
Cids	Electrical power	196	207
Torque Tube	Flight controls	194	1,027	594	43
Cowling	Engine	194	656	29	11
Compensator	Fuel system	194	284	84	19
Fuel Tank	Fuel system	192	529	217	26
Stand Off	Engine	189	264	10	7
Hinge Pin	Airframe structure	187	545	92	32
Inlet	Engine	187	394	35	18
Hf Comm	Instruments and avionics	187	249
Panel Support	Airframe structure	187	233	14	5
Elevator	Airframe structure	185	422	63	13
Bleed Air	Engine	185	393	122	34
Fseu	Flight controls	184	374	4	1
Finger Doubler	Airframe structure	183	617
Target	Airframe structure	183	490	178	19
Plug	Engine	182	502	1,395	191
Pressure Blkhd	Airframe structure	182	308
Fcu	Engine	181	965
Harness	Engine	181	744	12,337	141
Tachometer	Rotorcraft systems	181	291	35	7
Pcu	Flight controls	179	1,071	1,497	24
Control Lever	Landing gear	179	409	4	3
Heat Exchanger	Heating, ice protection and utility systems	176	470	273	29
Adiru	Instruments and avionics	175	247	2	2
Power Unit	Electrical power	174	421	154	22
Escape Reel	Cabin, seats and restraints	173	201
Gasket	Engine	172	653	4,268	255
Solenoid	Airframe structure	171	605	52	20
Receptacle	Airframe structure	170	501	293	45
Fuel Filter	Engine	170	441	212	33
Brake Sys	Landing gear	170	430
Guide	Airframe structure	169	522	1,097	99
Slat System	Flight controls	167	331
Cam	Airframe structure	164	443	213	55
Bellcrank	Airframe structure	163	767	172	33
Bustle	Cabin, seats and restraints	163	163	17	4
Pushrod	Engine	162	382	55	15
Hook And	Cabin, seats and restraints	160	254
Gate	Airframe structure	159	578	47	11
Drain	Airframe structure	159	317	86	30
Barrier	Airframe structure	159	174	82	18
Placard	Other and general	158	1,119	10,155	142
Coalescer Bag	Heating, ice protection and utility systems	158	888	4	1
Radome	Airframe structure	156	441	339	31
Tail Cone	Airframe structure	156	273	75	19
Canister	Airframe structure	155	170	11	5
Fire Bottle	Emergency equipment	154	509	6	4
Coupler	Instruments and avionics	154	415	52	13
Dampener	Airframe structure	154	305	10	7
Socket	Electrical power	153	1,222	81	30
Arm	Airframe structure	153	822	654	93
Contactor	Electrical power	153	546	94	9
Yoke	Engine	153	500	75	29
Tension Tie	Airframe structure	152	659	6	2
Stop	Airframe structure	151	564	426	98
Anchor Fitting	Airframe structure	151	329	3	1
Trim System	Flight controls	150	461
Rod End	Airframe structure	148	919	978	85
Gauge	Cabin, seats and restraints	148	453	56	14
Fork	Airframe structure	148	452	23	16
Sheet	Airframe structure	148	265	12	8
Electronic Unit	Flight controls	147	392
Detector	Emergency equipment	146	740	240	22
Transmission	Flight controls	146	465	65	3
Spinner	Engine	145	298	102	10
Button	Airframe structure	145	288	98	33
Governor	Propeller	139	924	394	4
Elt	Cabin, seats and restraints	139	898	1	1
Control Handle	Landing gear	139	506
Mount Bracket	Airframe structure	139	441	43	15
Processor	Fuel system	139	300	37	7
Air Filter	Heating, ice protection and utility systems	139	231	158	34
Trim Panel	Airframe structure	138	335	30	7
Oxygen Bottle	Emergency equipment	137	336	11	3
Filler	Airframe structure	137	242	1,274	89
Shade	Cabin, seats and restraints	137	167	291	21
Floor Skin	Airframe structure	136	328
Fault Message	Engine	135	136
Attach Bolt	Airframe structure	134	215	2	1
Ground Wire	Electrical power	133	386
Steering Sys	Landing gear	133	346
Escape Rope	Cabin, seats and restraints	132	227	13	3
Altimeter	Instruments and avionics	131	823	1	1
Splice Strap	Airframe structure	131	137	61	8
Fadec	Engine	130	284	59	6
Shear Angle	Airframe structure	129	144
Uplock	Landing gear	127	623	33	4
Collar	Airframe structure	127	332	276	59
Isolator	Airframe structure	124	357	317	37
Contact	Electrical power	123	344	128	26
Impulse Coupling	Engine	123	289	47	2
Regulator Valve	Heating, ice protection and utility systems	123	283	15	3
Winglet	Airframe structure	122	171	23	8

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.