Parts · Engine

Oil System

887 failure reports named the oil system in the last ten years, 2,023 since 1995, most often on the Airbus A320; the condition most often found was "leaking". 1 FAA approvals let 1 company make a replacement oil system, Multisciences INC holding the most (1).

Reports by year

Reports by year, as a table

	reports
1995	9
1996	14
1997	28
1998	8
1999	6
2000	1
2001	14
2002	36
2003	18
2004	18
2005	14
2006	47
2007	75
2008	88
2009	70
2010	80
2011	122
2012	153
2013	122
2014	104
2015	109
2016	50
2017	60
2018	87
2019	97
2020	59
2021	67
2022	36
2023	22
2024	129
2025	183
2026	97

Which system the reports file it under last ten years

Engine862Electrical power11Heating, ice protection and utility systems10Flight controls2Instruments and avionics1Airframe structure1

Reports by system, as a table

	reports
Engine	862
Electrical power	11
Heating, ice protection and utility systems	10
Flight controls	2
Instruments and avionics	1
Airframe structure	1

Models most often reporting it last ten years

Airbus A320154Airbus A321133Boeing 767104Boeing 73797Airbus A31973Airbus A33041Bombardier CL-600 Challenger and CRJ30Boeing 75727Cessna 560 Citation V, Ultra, Encore and Excel19Embraer EMB-145 ERJ 14517Boeing 77715Boeing 74710

Models most reported, as a table

	reports
Airbus A320	154
Airbus A321	133
Boeing 767	104
Boeing 737	97
Airbus A319	73
Airbus A330	41
Bombardier CL-600 Challenger and CRJ	30
Boeing 757	27
Cessna 560 Citation V, Ultra, Encore and Excel	19
Embraer EMB-145 ERJ 145	17
Boeing 777	15
Boeing 747	10

How it failed the condition found, last ten years

leaking401low165overserviced133low pressure79overtemp15empty10fluctuates10warning message9pressure loss7malfunctioned6

Conditions found, as a table

	reports
leaking	401
low	165
overserviced	133
low pressure	79
overtemp	15
empty	10
fluctuates	10
warning message	9
pressure loss	7
malfunctioned	6

Engines most often reporting it

International Aero Engines PW1133GA-JM 33CFM International CFM56 series 25International Aero Engines PW1133G-JM 20International Aero Engines PW1127G-JM 16Rolls-Royce RB-211 series 14Pratt & Whitney PW4060 11Pratt & Whitney Canada PW150A 10Pratt & Whitney PW2037 10General Electric CF34-3B1 9General Electric CF6-80C2B1F 8

Approved replacement parts 1 parts manufacturer approvals

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

Multisciences INC 1

Maker	Part	Replaces	Fits	Granted	Status
Multisciences INC	Oil System Parts MI-20071	20071	Viking Air Limited (Otter) DHC-3	2021-05-14	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.