Directional Gyro Calibration Model 131/132/135

The directional gyro is a DC resolver instrument. Adjust by rotating the resolver on the backside of the instrument. Before adjusting the directional gyro feedback resolver, be sure to calibrate the input reference (phase circuitry) signals.

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Collective Calibration on Model 135

Adjustment of the Model 135 collective control potentiometer is accomplished by removing the collective potentiometer and mounting bracket assembly, loosening a setscrew on a gear mounted on the potentiometer shaft, and adjusting the gear position on the shaft.

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