Aoa

96 failure reports named the aoa in the last ten years, 121 since 1996, most often on the Boeing 737; the condition most often found was "faulted".

Reports by year

Reports by year, as a table

	reports
1996	3
1998	1
2006	2
2007	3
2008	1
2009	2
2010	2
2011	3
2013	2
2014	3
2015	3
2016	4
2017	5
2018	3
2019	5
2020	11
2021	6
2022	9
2023	14
2024	12
2025	15
2026	12

Which system the reports file it under last ten years

Instruments and avionics90Heating, ice protection and utility systems5Flight controls1

Reports by system, as a table

	reports
Instruments and avionics	90
Heating, ice protection and utility systems	5
Flight controls	1

Models most often reporting it last ten years

Models most reported, as a table

	reports
Boeing 737	43
Boeing 767	7
Embraer EMB-145 ERJ 145	5
Pilatus PC-12	5
Airbus A320	4
Aerospatiale ATR 72	3
Boeing 747	3
Bombardier CL-600 Challenger and CRJ	3
Airbus A330	2
Boeing 757	2
Bombardier DHC-8 Dash 8 and Q400	2
Cessna 750 Citation X	2

How it failed the condition found, last ten years

faulted24failed17faulty11malfunctioned10inoperative8damaged3fault message3missing3defective2out of limits2

Conditions found, as a table

	reports
faulted	24
failed	17
faulty	11
malfunctioned	10
inoperative	8
damaged	3
fault message	3
missing	3
defective	2
out of limits	2

Engines most often reporting it

Pratt & Whitney PT6A series 2 Rolls-Royce RB-211 series 1

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.