Parts · Flight controls

Flap System

642 failure reports named the flap system in the last ten years, 1,646 since 1997, most often on the Boeing 737; the condition most often found was "malfunctioned". 2 FAA approvals let 1 company make a replacement flap system, Moog INC holding the most (2).

Reports by year

Reports by year, as a table

	reports
1997	1
2005	140
2006	189
2007	223
2008	133
2009	51
2010	40
2011	50
2012	62
2013	58
2014	29
2015	28
2016	51
2017	45
2018	28
2019	43
2020	28
2021	80
2022	42
2023	32
2024	96
2025	109
2026	88

Which system the reports file it under last ten years

Flight controls630Airframe structure11Electrical power1

Reports by system, as a table

	reports
Flight controls	630
Airframe structure	11
Electrical power	1

Models most often reporting it last ten years

Boeing 737183Bombardier CL-600 Challenger and CRJ102Boeing 75775Boeing 76742Embraer ERJ 170 E170 and E17536Airbus A32122Embraer EMB-505 Phenom 30021Embraer EMB-145 ERJ 14519Airbus A32018Cessna 750 Citation X13Airbus A31911Airbus A30010

Models most reported, as a table

	reports
Boeing 737	183
Bombardier CL-600 Challenger and CRJ	102
Boeing 757	75
Boeing 767	42
Embraer ERJ 170 E170 and E175	36
Airbus A321	22
Embraer EMB-505 Phenom 300	21
Embraer EMB-145 ERJ 145	19
Airbus A320	18
Cessna 750 Citation X	13
Airbus A319	11
Airbus A300	10

How it failed the condition found, last ten years

malfunctioned219faulted130failed77locked42warning message33stuck28asymetric9false indication9fault message9inoperative9

Conditions found, as a table

	reports
malfunctioned	219
faulted	130
failed	77
locked	42
warning message	33
stuck	28
asymetric	9
false indication	9
fault message	9
inoperative	9

Engines most often reporting it

General Electric CF34-3A1 2General Electric CF34-3B 2CFM International CFM56-7B27 1CFM International CFM56 series 1General Electric CF34-3B1 1Pratt & Whitney Canada PT6A-67P 1Pratt & Whitney Canada PW535E 1Pratt & Whitney PT6-67A 1

Approved replacement parts 2 parts manufacturer approvals

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

Moog INC 2

For these models most: Airbus A350 (2).

Maker	Part	Replaces	Fits	Granted	Status
Moog INC	Flap System Torque Limiter C64979-003	C64979-003	Airbus A350-1041	2017-12-14	current
Moog INC	Flap System Torque Limiter C64979-003	C64979-003	Airbus A350-941	2015-03-16	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.