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.

FSC 6350 Miscellaneous Alarm, Signal, and Security Detection Systems

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.