Aircraft Turntable Checks Compasses (Sep, 1949)
Aircraft Turntable Checks Compasses
Aircraft compasses can be quickly checked for accuracy and any errors corrected with a compensator that is embedded in concrete at the airfield. The old method of compensating a compass was to maneuver the plane to definite headings on the ground which were determined by reference lines from a compass rose painted on the field. The new compensator is a bowl-shaped disk free to turn on a base plate which contains a compass rose dial. The aircraft is headed approximately north and one wheel rolled onto the turntable. The plane then is rotated until the heading is magnetic north. With a pointer set at zero, the directions are determined by swinging the plane until the pointer indicates the desired reading. The compass is then compensated for error.