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
Release System	Cabin, seats and restraints	6	19
Suppressor	Airframe structure	6	19
Ball	Cabin, seats and restraints	6	18	291	64
Densitometer	Fuel system	6	18	10	3
Curtain	Cabin, seats and restraints	6	17	358	28
Lamp Socket	Electrical power	6	17	8	3
Return Spring	Cabin, seats and restraints	6	14	1	1
Unlock Switch	Engine	6	14
Water System	Cabin, seats and restraints	6	14	21	8
Gas Spring	Airframe structure	6	12	16	10
Localizer	Instruments and avionics	6	11
Support Ring	Engine	6	11	26	14
Wave Guide	Instruments and avionics	6	11	6	1
Slide Sleeve	Cabin, seats and restraints	6	10	2	2
Cover Panel	Airframe structure	6	9	27	12
Gutter	Airframe structure	6	9	19	6
Junction Box	Airframe structure	6	9	128	39
Mmr	Instruments and avionics	6	9
Spar Splice	Airframe structure	6	9	2	1
Trash Bin	Cabin, seats and restraints	6	9	2	2
Arm Rest	Cabin, seats and restraints	6	7	98	7
Frequency Gen	Electrical power	6	7
Hp Turbine	Engine	6	7	1	1
Roller Guide	Airframe structure	6	7	7	5
Thrust Button	Engine	6	7	4	4
Aed	Cabin, seats and restraints	6	6
Door System	Airframe structure	6	6	1	1
Feedback Unit	Landing gear	6	6	12	1
Reference Unit	Instruments and avionics	6	6
Slide Enclosure	Cabin, seats and restraints	6	6
Stop Ring	Cabin, seats and restraints	6	6	1	1
Subframe	Airframe structure	6	6
Pitch Link	Rotorcraft systems	5	148	18	5
Distributor Gear	Engine	5	132	4	1
Torque Sensor	Flight controls	5	61	7	2
Rotor Head	Rotorcraft systems	5	54	1	1
Adg	Electrical power	5	52	1	1
Rmu	Instruments and avionics	5	49
Combustion Case	Engine	5	48
Headset	Instruments and avionics	5	47	4	2
Ring Gear	Flight controls	5	43	8	6
Cam Follower	Airframe structure	5	38	45	8
Drum	Airframe structure	5	37	17	10
Monopole	Engine	5	36
Vsi	Instruments and avionics	5	33
Spoiler Panel	Airframe structure	5	31	16	1
Shoe	Landing gear	5	29	63	12
Key	Instruments and avionics	5	28	214	58
Acars	Instruments and avionics	5	24	41	3
Nut Clip	Airframe structure	5	24	15	3
Cushion	Cabin, seats and restraints	5	22	781	42
Longeron Clip	Airframe structure	5	22
Fairlead	Flight controls	5	20	176	20
Fence	Engine	5	20	28	8
Totalizer	Fuel system	5	20	4	1
Sending Unit	Fuel system	5	19
Butterfly Valve	Heating, ice protection and utility systems	5	18	36	8
Cargo Net	Airframe structure	5	17	63	15
Spu	Heating, ice protection and utility systems	5	17	2	1
Uplock Bracket	Landing gear	5	17
Rocker Cover	Engine	5	16	116	5
Discharge Tube	Emergency equipment	5	15
Scanner	Instruments and avionics	5	15	1	1
Thrust Washer	Landing gear	5	15	117	25
Dme	Instruments and avionics	5	14	2	1
Eva Tube	Heating, ice protection and utility systems	5	14
Return Line	Engine	5	14	6	2
Splash Guard	Cabin, seats and restraints	5	13	10	3
Control Stick	Flight controls	5	11	3	3
Via	Instruments and avionics	5	11	3	3
End Plug	Airframe structure	5	10	37	9
Scupper	Engine	5	10	8	5
Skin Lap	Airframe structure	5	10
Guide Stop	Airframe structure	5	9
Tension Spring	Flight controls	5	9	16	7
Ladder	Cabin, seats and restraints	5	8	12	3
Arrestor	Engine	5	7	2	1
Flaperon	Airframe structure	5	7
Lock Bolt	Airframe structure	5	7	4	2
Inlet Door	Engine	5	6	1	1
Reverser Half	Engine	5	6
Dcpc	Electrical power	5	5
Fuel Unit	Fuel system	5	5
Ife Equipment	Instruments and avionics	5	5
Lcca	Heating, ice protection and utility systems	5	5
Lock Fitting	Airframe structure	5	5	3	1
Mixing Unit	Flight controls	5	5
Pull Strap	Airframe structure	5	5	4	3
Thrust Bracket	Airframe structure	5	5
Pa System	Instruments and avionics	4	146	4	1
Clock	Instruments and avionics	4	119	51	8
Distributor Blk	Engine	4	107
Compressor Wheel	Engine	4	87
Combustion Liner	Engine	4	78	2	2
Seal Ring	Engine	4	62	563	66
Gas Generator	Engine	4	60	5	3
Airstair	Airframe structure	4	44	19	6
Idler Gear	Engine	4	44
Shoulder Belt	Cabin, seats and restraints	4	42
Rod Bearing	Engine	4	40	2	2

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.