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
Comparator	Instruments and avionics	4	31
Keel	Airframe structure	4	29
Thru Bolt	Engine	4	29	13	3
Battery Box	Cabin, seats and restraints	4	28	30	14
Periseal	Heating, ice protection and utility systems	4	26
Torque Shaft	Flight controls	4	26	16	5
Link Rod	Airframe structure	4	25	13	10
Idler	Engine	4	24	9	6
Dowel Pin	Engine	4	23	33	20
Wastegate Valve	Engine	4	23
Case Half	Engine	4	20
Header	Airframe structure	4	19	157	17
Roll Servo	Flight controls	4	19	42	3
Lock Tab	Engine	4	18	24	10
Nose Rib	Airframe structure	4	18	3	2
Seam	Cabin, seats and restraints	4	18
Inlet Guide	Engine	4	17	21	8
Retract Cylinder	Landing gear	4	17	2	1
Faceplate	Electrical power	4	15	81	16
Vor System	Instruments and avionics	4	15
Bag	Cabin, seats and restraints	4	14	143	10
Fuel Bowl	Engine	4	14	4	2
Magnet	Engine	4	14	63	17
Switching Unit	Flight controls	4	14	8	4
Gpws	Instruments and avionics	4	13	1	1
Hot Water	Cabin, seats and restraints	4	12	1	1
Cam Lock	Airframe structure	4	11	4	2
Keypad	Airframe structure	4	11	23	4
Latch Pin	Airframe structure	4	11	57	12
Clutch Actuator	Rotorcraft systems	4	9
Datalink	Instruments and avionics	4	9
Gpu	Electrical power	4	9
Circuit	Engine	4	8	25	6
Glare Shield	Instruments and avionics	4	8	81	18
Data Card	Instruments and avionics	4	7
Exhaust Mixer	Engine	4	7
Pma	Engine	4	7	16	3
Test Unit	Cabin, seats and restraints	4	7	1	1
Tunnel Wall	Airframe structure	4	7
Jumpseat	Cabin, seats and restraints	4	6
Packboard	Cabin, seats and restraints	4	6	241	1
Retainer Cup	Cabin, seats and restraints	4	6	3	2
Guide Track	Airframe structure	4	5	20	3
Inflation Sys	Cabin, seats and restraints	4	5
Lock Wire	Cabin, seats and restraints	4	5
Rib Splice	Airframe structure	4	5	3	2
Adm	Instruments and avionics	4	4
Control Manifold	Engine	4	4
Distribution Vlv	Heating, ice protection and utility systems	4	4
Driver Unit	Instruments and avionics	4	4
Elect Module	Flight controls	4	4	3	1
Exhaust Vent	Airframe structure	4	4	3	1
Heads Up	Instruments and avionics	4	4	5	2
Isolator Mount	Cabin, seats and restraints	4	4	11	5
Safety Equip	Cabin, seats and restraints	4	4
Slat Valve	Cabin, seats and restraints	4	4	1	1
Spcc	Flight controls	4	4
Tag	Cabin, seats and restraints	4	4	6	2
Gearshaft	Engine	3	94	244	30
Starflex	Rotorcraft systems	3	92
Flex Drive	Flight controls	3	74	30	2
Sun Gear	Engine	3	44	2	2
Uplock Roller	Landing gear	3	44	3	2
Control Wheel	Flight controls	3	40	32	13
Spur Gear	Engine	3	40	31	15
Frahm	Airframe structure	3	39
Seal Seat	Engine	3	37	1	1
Thrust Bearing	Airframe structure	3	37	16	12
Saddle	Landing gear	3	35	26	12
Valve Spring	Engine	3	35	10	2
Sprag Clutch	Rotorcraft systems	3	34
Torque Knee	Landing gear	3	34
Power Strip	Electrical power	3	33
Powerplant	Engine	3	33	3	2
Fusible Plug	Landing gear	3	31	1	1
Oil Tube	Engine	3	30	9	5
Clevis Pin	Airframe structure	3	29	4	3
Fireseal	Engine	3	28	143	17
Drag Strut	Landing gear	3	27	161	7
Selector Knob	Flight controls	3	27
Shaft Seal	Engine	3	27	79	13
Mfc	Heating, ice protection and utility systems	3	26
Vernatherm	Engine	3	25
Dome	Airframe structure	3	22	30	10
Rocker Boss	Engine	3	22
Uplock Target	Landing gear	3	22
Clevis Bolt	Flight controls	3	21	2	2
Gascolator	Fuel system	3	21	11	2
Fire	Cabin, seats and restraints	3	19	38	4
Rudder Bar	Flight controls	3	19	2	1
Slip Joint	Engine	3	19	30	10
Csu	Flight controls	3	18	23	4
Lockwasher	Cabin, seats and restraints	3	18	84	26
Ctot Panel	Airframe structure	3	17
Restrictor	Flight controls	3	17	68	25
Brake Cable	Landing gear	3	16	8	5
Conditioner	Engine	3	16	4	3
Drive System	Flight controls	3	16
Flywheel	Engine	3	16
Reducer	Heating, ice protection and utility systems	3	16	162	32

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.