Radio Compass Bearing Indicator Type MN-40E Piasecki Advanced with Radio Aids (TO

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

the top compass card would rotate to match the heading on the bottom card

such as torpedo bomber TBM Avenger

The A-3A autopilot system was pneumatically-operated

Sperry part number 644836

Radio Compass Bearing Indicator Type MN-40E Piasecki Advanced with Radio Aids (TOHere 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