In the aircraft gyrocompassing testing and calibration, in dot and cross system, if only dot is visible or if only cross is visible in an annunciator, what will it indicate in both conditions means what for only dot and what...

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happyame7

In the aircraft gyrocompassing testing and calibration, in dot and cross system, if only dot is visible or if only cross is visible in an annunciator, what will it indicate in both conditions means what for only dot and what for only cross.
a. Precession is low
b. Precession circuit open
c. Precession circuit faulty

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