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

Sperry part number 644836

This instrument appeared on the P-3 Flight Status Panel in a section called Wind Leading Edge Skin Temp

The A-3A autopilot system was pneumatically-operated

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

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