Radio Compass Bearing Indicator Type MN-40E Piasecki The Fl number is illegible

The Fl number is illegible

25 inches diameter and 6 inches deep

Across the inside of the ring are two horizontal

The two sliding markers along the perimeter of the scale are marked E (for QFE) and F (for QFF)

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

Radio Compass Bearing Indicator Type MN-40E Piasecki The Fl number is illegibleHere 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