FSC 6340 Aircraft Alarm and Signal Systems
Includes Oxygen Pressure Signals and Warning Devices; such as Air Pressure Warning Signals, Aircraft Crew Warning Signals, Altitude Warning Signals, Alarm Controls, Audible Landing Gear Alarms.
Excludes Aircraft Engine Oil and Fuel Warning Devices.
Includes Anti-intrusion Alarm Systems; Foghorns; Gongs; Chimes; Bells; Burglar Alarm Systems; Fire Alarms; Police Alarm Systems; Sounding Devices; Manual Gas Alarms; Landing Wands; Security Inspection Systems
Excludes Loran; Radar; Sonar; Engine Oil and Fuel Warning Devices; Aircraft Oxygen Warning Devices.
FSC 6310 Traffic and Transit Signal Systems
Excludes Railroad Signals.
FSC 6320 Shipboard Alarm and Signal Systems
FSC 6330 Railroad Signal and Warning Devices
Includes Railroad Gates; Flasher Lights; Block Signals.
Excludes Semaphore Flag Signals.