MIL-I-5099B, MILITARY SPECIFICATION: INDICATOR, CABIN AIR PRESSURE, 1-7/8 INCH DIAL, TYPE MA-1 (13-DEC-1968) [S/S BY MIL-DTL-5099C]
MIL-I-5099B, MILITARY SPECIFICATION: INDICATOR, CABIN AIR PRESSURE, 1-7/8 INCH DIAL, TYPE MA-1 (13-DEC-1968) [S/S BY MIL-DTL-5099C]., This specification covers the design and performance requirements for one
type of pressure altitude indicator having a range of 0 to 50,000 feet.