MIL-T-5421B, MILITARY SPECIFICATION: TUBES, PITOT, ELECTRICALLY HEATED, AIRCRAFT (20 MAY 1969) [S/S BY MIL-DTL-5421D]

MIL-T-5421B, MILITARY SPECIFICATION: TUBES, PITOT, ELECTRICALLY HEATED, AIRCRAFT (20 MAY 1969) [S/S BY MIL-DTL-5421D]., This specification covers all types of two-wire electrically heated pitot tubes for use with airspeed indicators.