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AACs - Part 1-107 - Airworthiness Articles
Part 1 - Airworthiness Articles
Beech 1900 - Fire Pull Handle Switch Assemblies
The purpose of this article is to advise a potential problem if incorrect pull handle switch assemblies are fitted to Beechcraft B1900 aircraft.
An operator has reported to CASA an unsafe condition when a switch assembly manufactured by Avionic Products Co., P/N 71220-1, was fitted to a Beech B1900D aircraft.
Beechcraft B1900D IPC only identifies the switch assembly, P/N 114-320052-3, as being acceptable for installation. This part can not be interchanged with the Raytheon switch assembly P/N 114-320052-1 fitted on B1900C aircraft due to the wiring differences. The Raytheon switch assemblies are also manufactured by Avionic Products Co. as switch assemblies P/N 71220-1. If the Raytheon P/N 114-320052-1 or the Avionic Products Co. P/N 71220-1 is fitted to B1900D aircraft the fuel shutoff valves will only operate with aircraft battery power on line and will not operate with the aircraft on generator power.
Avionic Products Co. switch assemblies are not identified in the Beechcraft IPC and hence are not approved for installation on B1900 aircraft. They will require approval by a CAR 36 authorised person prior to installation.