Mach Speed Indicator (Machmeter), Mk 3A, Ref 6A/3300, RAF Carvair As the aircraft climbs

As the aircraft climbs

and the knob rotates stiffly

This example has been installed in an aircraft during its service life

Our example is yellow-tagged as serviceable

Mach Speed Indicator (Machmeter), Mk 3A, Ref 6A/3300, RAF Carvair As the aircraft climbsThis is a fine example of a Cold War era Mach Speed Indicator Mk 3A Ref 6A 3300, as used in aircraft of the British Royal Air Force. The indicator displays aircraft mach speed from 0. 7 to 1. 3 mach. The serial number indicates a year of manufacture of 1958. The indicator is also marked with K. M. A. 0201K, likely a part number. The RAF Air Ministry arrow emblem is marked on the rear case. The adjustment screw at 6 o'clock position moves a white