Parts · Instruments and avionics

Warning Horn

85 failure reports named the warning horn in the last ten years, 290 since 1995, most often on the Boeing 737; the condition most often found was "false activation".

Reports by year

Reports by year, as a table

	reports
1995	4
1996	9
1997	5
1998	3
1999	4
2000	4
2001	8
2002	6
2003	21
2004	20
2005	14
2006	25
2007	9
2008	5
2009	8
2010	9
2011	11
2012	12
2013	11
2014	11
2015	6
2016	7
2017	6
2018	7
2019	8
2020	13
2021	10
2022	10
2023	1
2024	8
2025	11
2026	4

Which system the reports file it under last ten years

Instruments and avionics34Cabin, seats and restraints12Landing gear12Airframe structure8Heating, ice protection and utility systems7Emergency equipment6Rotorcraft systems3Flight controls2Electrical power1

Reports by system, as a table

	reports
Instruments and avionics	34
Cabin, seats and restraints	12
Landing gear	12
Airframe structure	8
Heating, ice protection and utility systems	7
Emergency equipment	6
Rotorcraft systems	3
Flight controls	2
Electrical power	1

Models most often reporting it last ten years

Boeing 73725Airbus A30014Boeing 7678Bombardier DHC-8 Dash 8 and Q4006Boeing Of Canada/Dehav Div DHC-84Airbus A3193Airbus A3203Robinson R443Airbus A3212Beechcraft C90 King Air C902Boeing 7472Boeing 7772

Models most reported, as a table

	reports
Boeing 737	25
Airbus A300	14
Boeing 767	8
Bombardier DHC-8 Dash 8 and Q400	6
Boeing Of Canada/Dehav Div DHC-8	4
Airbus A319	3
Airbus A320	3
Robinson R44	3
Airbus A321	2
Beechcraft C90 King Air C90	2
Boeing 747	2
Boeing 777	2

How it failed the condition found, last ten years

false activation49activated15inoperative8no test4illuminated2activation error1defective1false indication1faulted1malfunctioned1

Conditions found, as a table

	reports
false activation	49
activated	15
inoperative	8
no test	4
illuminated	2
activation error	1
defective	1
false indication	1
faulted	1
malfunctioned	1

Engines most often reporting it

Lycoming O-540-F1B5 2Lycoming IO-540-AE1A5 1Pratt & Whitney Canada PW305A 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.