Radio Compass Bearing Indicator Type MN-40E Piasecki Sperry part number 644836

Sperry part number 644836

Advanced with Radio Aids (TO 30-100B-1

By viewing the target through the device and turning the knob until the presumed height of the known target is bracketed between the upper and lower limiters in the viewfinder

The A-3A autopilot system was pneumatically-operated

such as torpedo bomber TBM Avenger

Radio Compass Bearing Indicator Type MN-40E Piasecki Sperry part number 644836Here is a good example of a Radio Compass Bearing Indicator, Type MN 40E, The face and its use is very similar in appearance to the I 82 A indicator of a number of radio compass systems used during and after WWII. The Bendix data label does not contain any recognizable US military markings and may have been for a civil commercial aircraft. The indicator was connected via flexible mechanical cable to a rotatable loop antenna mounted either on the top