Parts · Engine

Apu

1,554 failure reports named the apu in the last ten years, 3,325 since 1995, most often on the Boeing 767; the condition most often found was "odor". 5 FAA approvals let 5 companies make a replacement apu, Pats Aircraft LLC holding the most (1).

Reports by year

Reports by year, as a table

	reports
1995	45
1996	47
1997	47
1998	47
1999	54
2000	107
2001	87
2002	71
2003	73
2004	66
2005	98
2006	85
2007	103
2008	97
2009	106
2010	100
2011	107
2012	120
2013	113
2014	104
2015	94
2016	114
2017	133
2018	193
2019	169
2020	96
2021	168
2022	221
2023	93
2024	155
2025	129
2026	83

Which system the reports file it under last ten years

Engine1,500Heating, ice protection and utility systems49Electrical power2Emergency equipment2Airframe structure1

Reports by system, as a table

	reports
Engine	1,500
Heating, ice protection and utility systems	49
Electrical power	2
Emergency equipment	2
Airframe structure	1

Models most often reporting it last ten years

Boeing 767329Airbus A320284Airbus A319256Airbus A321160Boeing 737127Airbus A30067Boeing 75739Airbus A33038Bombardier CL-600 Challenger and CRJ38Bombardier BD-100 Challenger 300 and 35021Cessna 680 Citation Sovereign and Latitude21Boeing 77720

Models most reported, as a table

	reports
Boeing 767	329
Airbus A320	284
Airbus A319	256
Airbus A321	160
Boeing 737	127
Airbus A300	67
Boeing 757	39
Airbus A330	38
Bombardier CL-600 Challenger and CRJ	38
Bombardier BD-100 Challenger 300 and 350	21
Cessna 680 Citation Sovereign and Latitude	21
Boeing 777	20

How it failed the condition found, last ten years

odor442leaking236malfunctioned151contaminated140faulted106shutdown67failed58smoke53unknown50inoperative47

Conditions found, as a table

	reports
odor	442
leaking	236
malfunctioned	151
contaminated	140
faulted	106
shutdown	67
failed	58
smoke	53
unknown	50
inoperative	47

Engines most often reporting it

International Aero Engines V2527-A5 5CFM International CFM56-5B6/P 3International Aero Engines V2524-A5 3International Aero Engines V2533-A5 3CFM International CFM56-5B4/P 2CFM International CFM56-5B3/P 1CFM International CFM56-5B6 1CFM International CFM56-7B27 1CFM International CFM56 series 1Pratt & Whitney PW4168A 1

Approved replacement parts 5 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a apu and sell it as an approved part for the models named. These are the companies holding such approvals for a apu:

Pats Aircraft LLC 1Honeywell International INC. 1Honeywell International INC 1Gulfstream Aerospace LP 1Galaxy Aerospace CO LP 1

For these models most: Israel Aircraft Industries GALAXY (2), Gulfstream GIV-X G450 (2).

Maker	Part	Replaces	Fits	Granted	Status
Honeywell International INC.	APU/Ground Connection Check Valve 123312-9-1	123312-9-1	Gulfstream Aerospace... GIV-X	2022-12-16	current
Pats Aircraft LLC	APU Kit 651-1-133-101	651-1-331-101	Hawker Beechcraft 750, 800XP, 850XP	2008-12-15	current
Honeywell International INC	APU/Ground Connection Check Valve 123312-9-1	123312-9-1	Gulfstream GIV-X	2005-04-19	current
Gulfstream Aerospace LP	APU, GTCP 4AS6900010-501	IAI 4AS6900010-501	Gulfstream Galaxy	2001-06-06	current
Galaxy Aerospace CO LP	APU, GTCP 4AS6900010-501	IAI 4AS6900010-501	Gulfstream Galaxy	2001-05-08	current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.