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
Inverter	Electrical power	385	2,039	99	19
Transducer	Landing gear	385	1,429	593	57
Rivet	Airframe structure	379	1,047	463	57
Flap Track	Airframe structure	376	1,689	37	9
Slide Raft	Cabin, seats and restraints	374	542
Indication Sys	Airframe structure	371	800
Support Beam	Airframe structure	370	943	54	13
Seal Rest	Airframe structure	370	478
Heater	Heating, ice protection and utility systems	368	827	655	49
Radar	Instruments and avionics	368	771	2	2
Link	Airframe structure	361	1,567	1,040	111
Keelbeam	Airframe structure	360	1,647
Stub Frame	Airframe structure	357	362	3	2
Diaphragm	Airframe structure	354	756	1,035	69
Compressor	Engine	353	1,724	47	14
Rail	Airframe structure	347	522	781	48
Hydraulic System	Heating, ice protection and utility systems	346	886	26	7
Shroud	Electrical power	342	974	1,999	125
Access Door	Airframe structure	342	569	174	27
Box Beam	Airframe structure	340	377
Packing	Engine	329	730	6,254	102
Fire Warning	Emergency equipment	322	977	1	1
Tie Down	Airframe structure	321	592	37	11
Mechanism	Airframe structure	318	1,135	75	12
Circuit Card	Emergency equipment	316	983	20	7
Cradle	Cabin, seats and restraints	316	575	1,542	37
Selector Valve	Landing gear	311	1,338	39	16
Rub Strip	Airframe structure	309	602	1,021	47
Tie Clip	Airframe structure	307	2,264	1	1
Gcu	Electrical power	307	994	12	3
Start Valve	Engine	307	637	3	1
Longeron Splice	Airframe structure	304	763
Terminal	Electrical power	299	928	120	25
Door Seal	Airframe structure	297	594	61	19
Spacer	Engine	296	532	3,486	283
Window Post	Airframe structure	294	468
Ecu	Engine	292	870	28	6
Control Module	Landing gear	292	670	114	25
Antenna	Instruments and avionics	291	903	274	47
Shim	Airframe structure	291	694	2,534	187
Exhaust Valve	Engine	289	519	13	5
Life Vest	Cabin, seats and restraints	283	1,015	105	17
Repair	Airframe structure	281	1,293	47	10
Hmu	Engine	279	653
Support Frame	Airframe structure	277	346	6	3
Status Message	Heating, ice protection and utility systems	276	422
Balance Weight	Airframe structure	276	380	41	12
Igniter	Engine	275	603	265	8
Gust Lock	Airframe structure	275	363	4	3
Autothrottle Sys	Flight controls	274	440
Cooling Fan	Heating, ice protection and utility systems	269	571	39	18
Splice Plate	Airframe structure	266	523	162	28
Control Cable	Flight controls	264	2,878	300	32
Arming Lever	Airframe structure	262	313
Dummy Rail	Airframe structure	260	552
Snubber	Airframe structure	260	373	109	28
Landing	Airframe structure	260	275	11	5
Smoke Warning	Emergency equipment	258	507
Tab	Airframe structure	257	1,118	56	26
Support Plate	Airframe structure	257	265	68	23
Rod	Airframe structure	255	1,108	983	114
Deck Plate	Airframe structure	254	481	15	3
Thrust Reverser	Engine	251	590	262	43
Insert	Airframe structure	251	392	605	109
Frame Angle	Airframe structure	250	258	2	2
Ballast	Electrical power	247	1,222	331	9
Support Channel	Airframe structure	247	451	32	9
Tee Angle	Airframe structure	246	249	1	1
Failsafe	Airframe structure	245	714
Flange	Airframe structure	244	873	796	102
Autopilot Sys	Flight controls	243	564
Coupling	Airframe structure	241	1,133	792	106
Check Valve	Heating, ice protection and utility systems	241	830	1,152	71
Skate Angle	Airframe structure	238	375	3	2
Sill Drain	Airframe structure	238	245
Drag Fitting	Airframe structure	238	238	4	2
Holder	Cabin, seats and restraints	236	684	83	32
Oil Cooler	Engine	234	806	237	40
Guide Arm	Airframe structure	234	362	50	13
Fuel Sys	Fuel system	234	348	1	1
Ecs	Heating, ice protection and utility systems	234	244	2	2
Seal Depressor	Airframe structure	228	515	133	12
Regulator	Heating, ice protection and utility systems	227	984	209	34
Bear Strap	Airframe structure	226	594
Seat	Cabin, seats and restraints	225	671	839	97
Fuel Control	Engine	222	1,687	605	22
Pseu	Landing gear	222	799	53	1
Spoiler	Airframe structure	221	696	121	11
Starter Gen	Electrical power	220	927
Servo	Flight controls	219	1,314	23	10
Guard	Electrical power	219	500	136	36
Adc	Instruments and avionics	218	856
Cabin Pressure	Heating, ice protection and utility systems	218	384	80	14
Manifold	Landing gear	217	811	335	64
Exciter	Engine	217	444	204	6
Wheel	Landing gear	213	1,415	187	38
Shaft	Airframe structure	212	1,490	1,504	177
Liner	Airframe structure	212	510	846	70
Frame Splice	Airframe structure	212	375	2	2
Pitot Tube	Instruments and avionics	206	504	113	3

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.