Standard AIRSPEED INDICATOR (PITOT STATIC) 1947-07-01 HISTORICAL AS391 This specification covers six types of instruments as follows:
Standard DIRECTION INDICATOR, MAGNETIC, NON-STABILIZED TYPE (Magnetic Compass) 1947-07-01 HISTORICAL AS398 This specification covers two basic types as follows: Type I - Direct Reading Type II - Remote Indicating
Standard SMOKE DETECTORS 1947-07-01 HISTORICAL AS400 This specification covers two basic types as follows: Type I Carbon Monoxide Type II Photo-Electric Cell
Standard DIRECTION INDICATOR, NON-MAGNETIC, STABILIZED TYPE (Directional Gyro) 1947-02-01 HISTORICAL AS397 This specification covers two basic types as follows: Type I - Air Operated. Type II - Electrically Operated.