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
Toggle	Electrical power	3	16	23	10
Vane Cap	Airframe structure	3	16
Moisture Trap	Engine	3	14	2	1
Webbing	Instruments and avionics	3	14	45	8
Ehsi	Instruments and avionics	3	13
Drive Ring	Heating, ice protection and utility systems	3	12
Electrode	Engine	3	12	3	3
Filter Adapter	Engine	3	12
Flasher	Cabin, seats and restraints	3	12	12	10
Static System	Instruments and avionics	3	12	1	1
Inlet Screen	Instruments and avionics	3	11	7	5
Trim Cylinder	Flight controls	3	11
Cuff	Fuel system	3	10	21	8
Friction Lock	Engine	3	10
Journal	Engine	3	10	6	4
Nose Cone	Engine	3	10	3	3
Sight Gauge	Cabin, seats and restraints	3	10	4	2
Tmu	Heating, ice protection and utility systems	3	10	1	1
Pcdu	Electrical power	3	9
Stab System	Flight controls	3	9
Taper Pin	Cabin, seats and restraints	3	8	10	6
Tube Frame	Airframe structure	3	8	1	1
Appu	Flight controls	3	7
Attenuator	Heating, ice protection and utility systems	3	7	35	14
Intercom	Instruments and avionics	3	7	11	3
Keel Fitting	Airframe structure	3	7
Lubrication	Engine	3	7	1	1
Survival	Cabin, seats and restraints	3	7	18	3
Truck	Landing gear	3	7	64	4
Ice Breaker	Airframe structure	3	6
Key Pad	Instruments and avionics	3	6	1	1
Servo Drive	Flight controls	3	6	2	2
Shear Restraint	Airframe structure	3	6	4	2
Torque Motor	Engine	3	6	9	5
Antenna Lead	Instruments and avionics	3	5	1	1
Caster	Cabin, seats and restraints	3	5	51	3
Chime	Instruments and avionics	3	5	4	3
Ecc	Engine	3	5
Hose Connector	Instruments and avionics	3	5
Intercooler	Airframe structure	3	5	21	4
Io Card	Instruments and avionics	3	5
Absorber	Rotorcraft systems	3	4	11	5
Chain Drive	Airframe structure	3	4
Dial	Instruments and avionics	3	4	12	2
Eva System	Cabin, seats and restraints	3	4
Msc	Instruments and avionics	3	4
Overwing Exit	Airframe structure	3	4	5	2
Spoileron	Flight controls	3	4
Start Button	Engine	3	4
Suppression Sys	Emergency equipment	3	4
Adr	Instruments and avionics	3	3
Annular Shell	Airframe structure	3	3
Buffer Valve	Engine	3	3
Bulb Seal	Airframe structure	3	3	107	18
Buss Protection	Electrical power	3	3
Fats	Electrical power	3	3
Gsd	Instruments and avionics	3	3
Heated Fitting	Heating, ice protection and utility systems	3	3
Hydrolock	Cabin, seats and restraints	3	3
Integrator	Cabin, seats and restraints	3	3
Interface Module	Landing gear	3	3	3	2
Interlock Valve	Flight controls	3	3	1	1
Sem Unit	Fuel system	3	3
Tamper Strip	Cabin, seats and restraints	3	3
Usb Port	Electrical power	3	3	20	3
Universal	Flight controls	2	172	40	7
De Ice	Heating, ice protection and utility systems	2	107	93	4
Armature	Electrical power	2	105	21	9
Piston Rod	Landing gear	2	66	19	11
Cage	Emergency equipment	2	59	264	23
Bungee Cylinder	Landing gear	2	58
Freewheel Unit	Rotorcraft systems	2	52	1	1
Search Light	Electrical power	2	43	4	1
Transistor	Electrical power	2	39
Planetary Gear	Engine	2	37	6	3
Ejector Valve	Heating, ice protection and utility systems	2	35	4	2
Caution Panel	Instruments and avionics	2	30
Venturi	Airframe structure	2	29	19	6
Exhaust Header	Engine	2	27	6	1
Breather Tube	Engine	2	26	3	1
Eyebolt	Landing gear	2	26	32	13
Ball End	Rotorcraft systems	2	25	10	8
Ice Shield	Airframe structure	2	25
Wire Rope	Cabin, seats and restraints	2	25	8	4
Buss Tie	Electrical power	2	24
Cylinder Damper	Rotorcraft systems	2	24
Shear Beam	Airframe structure	2	24
Flex Duct	Heating, ice protection and utility systems	2	22	170	15
Lock Plate	Airframe structure	2	21	81	17
Labyrinth Seal	Engine	2	20	4	2
Torque Ring	Engine	2	20
Tail Rotor	Rotorcraft systems	2	19	169	30
Throttle Switch	Flight controls	2	19
Warn Panel	Engine	2	19
Bullet	Engine	2	18
Cross Tie	Airframe structure	2	17	6	4
Chin Bubble	Airframe structure	2	16	50	7
Lift Strut	Airframe structure	2	16	17	5
Rocker Shaft	Engine	2	16	3	2
Crossover Tube	Landing gear	2	14	2	1

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.