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
Iru	Instruments and avionics	46	188	6	1
Diffuser	Heating, ice protection and utility systems	46	136	210	33
Brake Disc	Landing gear	45	156	368	11
Release Mech	Airframe structure	44	156	7	1
Wing	Airframe structure	44	96	17	7
Flt Controls	Flight controls	44	73
Ignition Sys	Engine	44	68
Speed Brake	Flight controls	44	60	74	9
Potable Water	Cabin, seats and restraints	44	55	335	23
Fuel	Engine	43	151	22	12
Water Separator	Heating, ice protection and utility systems	43	123	87	14
Ground Stud	Electrical power	43	119	10	7
Static Wick	Instruments and avionics	43	115	1	1
Rvdt	Landing gear	43	95	22	6
Pressure Plate	Airframe structure	43	46	32	6
Rope	Cabin, seats and restraints	43	43	5	2
Transponder	Instruments and avionics	42	404	24	6
Turbine Blades	Engine	42	391
Annunciator	Airframe structure	42	261	142	16
Exhaust Duct	Engine	42	185	25	19
Handset	Instruments and avionics	42	169	844	19
Sensing Element	Emergency equipment	42	165	9	3
Fdu	Emergency equipment	42	54	7	2
Fault Light	Engine	42	45
Buss	Electrical power	41	104
Fms	Instruments and avionics	41	73	1	1
Test Switch	Cabin, seats and restraints	41	61
Lgciu	Landing gear	41	50	1	1
Oxygen Panel	Emergency equipment	41	43	71	7
Gps	Instruments and avionics	40	397	12	3
Cartridge	Airframe structure	40	210	658	34
Bonding Strap	Airframe structure	40	153	34	10
Microphone	Instruments and avionics	40	153	12	3
Fuel Heater	Engine	40	108	67	4
Position Sensor	Flight controls	40	108	10	7
Pressure Valve	Heating, ice protection and utility systems	40	100	6	3
Ignition Lead	Engine	40	92	572	9
Acoustic Liner	Engine	40	84	5	1
Warning Flag	Instruments and avionics	40	58
Waste Box	Airframe structure	40	40
Trim Switch	Flight controls	39	322	11	3
Pivot	Airframe structure	39	194	43	25
Ball Screw	Flight controls	39	63	76	14
Autobrake Sys	Landing gear	39	47
Protector	Airframe structure	39	47	19	12
Metering Valve	Landing gear	38	144	12	6
Ballscrew	Flight controls	38	56	10	3
Sdac	Airframe structure	38	53
Tank Unit	Fuel system	38	40	655	4
Master Cylinder	Landing gear	37	235	20	10
Release Cable	Cabin, seats and restraints	37	215	5	5
Quick Disconnect	Heating, ice protection and utility systems	37	133	115	11
Plunger	Airframe structure	37	111	191	57
Union	Heating, ice protection and utility systems	37	96	673	39
Connecting Rod	Engine	36	196	34	11
Dau	Instruments and avionics	36	124	3	3
Elastomer	Engine	36	46	14	1
Fan Cowl	Airframe structure	36	38	140	7
Turbine	Engine	35	443	33	8
Vent Line	Engine	35	129	13	3
Tripler	Airframe structure	35	93	27	8
Pulley Bracket	Airframe structure	35	85	40	14
Roller Track	Airframe structure	35	69	27	4
Lintel	Airframe structure	35	36	25	1
Roll Pin	Airframe structure	34	137	1	1
Mount Bolt	Airframe structure	34	54
Software	Instruments and avionics	34	52	87	10
Window Shade	Cabin, seats and restraints	34	47	201	28
Headrest	Cabin, seats and restraints	34	40	67	14
Truss	Airframe structure	33	164
Windscreen	Airframe structure	33	163	158	22
Chain	Airframe structure	33	93	37	10
Isolation Mount	Cabin, seats and restraints	33	82	5	2
Accelerometer	Engine	33	79	60	14
Wire Splice	Electrical power	33	33	3	1
Stator	Engine	32	390	106	26
Squib	Cabin, seats and restraints	32	118	3	2
Cowl Door	Airframe structure	32	90	14	5
Turnbuckle	Flight controls	32	86	115	16
Control Switch	Flight controls	32	82	11	2
Float Valve	Fuel system	32	78	14	3
Air Duct	Heating, ice protection and utility systems	32	67	86	16
Director	Instruments and avionics	32	57
Retainer Seal	Airframe structure	32	45	83	21
Pivot Pin	Landing gear	32	43	34	18
Yaw Damper	Flight controls	31	172	179	8
Loop	Emergency equipment	31	151	10	4
Screen	Engine	31	150	229	73
Blanking Plate	Airframe structure	31	120	56	16
Flex Line	Heating, ice protection and utility systems	31	114	2	1
Pitot System	Instruments and avionics	31	113
Flow Valve	Heating, ice protection and utility systems	31	86	6	3
Shock Absorber	Landing gear	31	77	18	9
Oxygen Gen	Emergency equipment	31	52
Flow Divider	Engine	30	118	92	9
Control Quadrant	Flight controls	30	84	25	3
Pilot Valve	Heating, ice protection and utility systems	30	73	19	12
Processing Unit	Fuel system	30	72
Aileron Sys	Flight controls	30	66
Ignition Unit	Engine	30	57	35	4

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.