Siren

1 failure reports named the siren in the last ten years, 4 since 2003, most often on the Boeing 737; the condition most often found was "inoperative". 2 FAA approvals let 1 company make a replacement siren, Air Methods CORP International holding the most (2).

Reports by year

Reports by year, as a table

	reports
2003	3
2022	1

Which system the reports file it under last ten years

Cabin, seats and restraints1

Reports by system, as a table

	reports
Cabin, seats and restraints	1

Models most often reporting it last ten years

Boeing 7371

Models most reported, as a table

	reports
Boeing 737	1

How it failed the condition found, last ten years

inoperative1

Conditions found, as a table

	reports
inoperative	1

Approved replacement parts 2 parts manufacturer approvals

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

Air Methods CORP International 2

For these models most: Airbus Helicopters MBB-BK 117 C-2 (1).

Maker	Part	Replaces	Fits	Granted	Status
Air Methods CORP International	Siren/PA System MDL 771-9056	Modification Parts	Eurocopter Deutschland GmbH ECD) (MBB-BK 117 C-2	2012-03-13	current
Air Methods CORP International	Siren/PA System MDL 771-9056	Modification Parts	Eurocopter Deutschland MBB-BK 117 C-2	2008-03-23	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.