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
Flight Dir	Flight controls	21	55
Door Track	Airframe structure	21	39	1	1
Counter	Cabin, seats and restraints	21	28	4	1
Power Port	Electrical power	21	21
Precatch	Airframe structure	21	21
Tach Generator	Engine	20	235	3	3
Seat Belt	Cabin, seats and restraints	20	210	19	12
Brush Block	Heating, ice protection and utility systems	20	198	22	6
Flapper Valve	Fuel system	20	145	12	7
Hand Rail	Airframe structure	20	93	2	2
Dcu	Instruments and avionics	20	88	2	2
Drag Link	Landing gear	20	83	48	9
Inertia Reel	Cabin, seats and restraints	20	74	20	5
Push Pull	Flight controls	20	68	61	5
Eadi	Instruments and avionics	20	66
Rack	Cabin, seats and restraints	20	61	180	49
Lock Pin	Airframe structure	20	59	15	8
Vhf Comm	Instruments and avionics	20	57	30	3
Blowout Panel	Airframe structure	20	52	12	6
Speaker	Instruments and avionics	20	48	204	10
Dome Nut	Airframe structure	20	43
Shelf	Airframe structure	20	42	107	35
Visor	Cabin, seats and restraints	20	32	49	12
Armrest	Cabin, seats and restraints	20	28	18	8
Warning Buzzer	Airframe structure	20	28
Assist	Airframe structure	20	23
Control Card	Heating, ice protection and utility systems	20	22	10	6
Heatshrink	Cabin, seats and restraints	20	20
Restraint	Airframe structure	19	184	157	20
Tip Cap	Airframe structure	19	155	40	9
Position Switch	Flight controls	19	147
Bearing Race	Airframe structure	19	132	26	9
Horn	Airframe structure	19	117	24	13
Leg	Landing gear	19	110	18	7
Static Line	Instruments and avionics	19	80	1	1
Tiller	Landing gear	19	72	1	1
Blanket	Engine	19	66	7,572	35
Thermal Switch	Heating, ice protection and utility systems	19	66	86	9
Blocker Door	Engine	19	64	87	8
Butt Joint	Airframe structure	19	47
Jumper	Airframe structure	19	40	377	19
Hub Cap	Landing gear	19	28	56	16
Guide Fitting	Airframe structure	19	19	2	1
Test Button	Electrical power	19	19	2	2
Oxygen System	Emergency equipment	18	224	54	12
Rudder Pedal	Flight controls	18	104	33	13
Ferrule	Airframe structure	18	88	145	32
Ram Air	Heating, ice protection and utility systems	18	86	84	15
Barrel Nut	Airframe structure	18	81	5	4
Door Actuator	Airframe structure	18	48	49	13
Smoke Barrier	Cabin, seats and restraints	18	40	13	7
Test Panel	Emergency equipment	18	34	11	5
Link Pin	Airframe structure	18	28	14	7
Flow Sensor	Heating, ice protection and utility systems	18	25	12	8
Surge Valve	Engine	18	23	2	2
Cap Seal	Airframe structure	18	22	17	7
Reu	Flight controls	18	21	1	1
Exhaust Cone	Engine	18	20
Tcas System	Instruments and avionics	18	19	2	1
Csd	Electrical power	17	327	1	1
Disk	Engine	17	154	154	28
Tie	Airframe structure	17	152	28	8
Skid	Landing gear	17	147	23	3
Rccb	Electrical power	17	75
Static Port	Instruments and avionics	17	65	19	10
Dimmer	Electrical power	17	58	68	12
Anchor	Airframe structure	17	56	16	9
Fuse Pin	Airframe structure	17	56	347	8
Lock Nut	Engine	17	55	27	13
Buckle	Cabin, seats and restraints	17	53	13	3
Helicoil	Airframe structure	17	36	5	2
First Aid	Cabin, seats and restraints	17	33	26	4
Sink	Cabin, seats and restraints	17	26	2	2
Overheat	Heating, ice protection and utility systems	17	22
Stay	Landing gear	17	22	12	8
Exhaust Fan	Heating, ice protection and utility systems	17	19
Hinge Box	Airframe structure	17	19
String	Airframe structure	17	19	8	3
Carabiner	Cabin, seats and restraints	17	17	3	2
Spindle	Airframe structure	16	169	160	23
Interphone	Instruments and avionics	16	149	26	4
Disc	Engine	16	105	80	27
Control Column	Flight controls	16	104	10	6
Master Switch	Electrical power	16	102	3	2
Conduit	Airframe structure	16	97	896	36
Cooling Turbine	Heating, ice protection and utility systems	16	90	35	4
Counterweight	Airframe structure	16	81	45	16
Warning Switch	Airframe structure	16	73	1	1
Sump	Engine	16	67	24	13
Bypass Switch	Engine	16	64
Stick Shaker	Instruments and avionics	16	63	6	4
Buss Bar	Electrical power	16	61	14	5
Bearing Cap	Landing gear	16	43	14	4
Servo Motor	Flight controls	16	28	2	2
Eiu	Engine	16	25
Grill	Airframe structure	16	24	157	29
Safety Pin	Cabin, seats and restraints	16	23	10	6
Warmer	Cabin, seats and restraints	16	22	5	3
Brake Caliper	Landing gear	16	21
Nonskid	Airframe structure	16	20

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.