What was found
(CAN) UNABLE TO SELECT GEAR UP ON DEPARTURE, RETURNED TO BASE. SWITCH CLEANED OF SLUSH. SAME PROBLEM OCCURRED BUT WAS CLEARED BY RESETTING CIRCUIT BREAKER. AFTER RETURN TO BASE, ANNUNCIATOR ILLUMINATED. INVESTIGATION FOUND THAT RT WEIGHT- ON-WHEEL TARGET RETAINING BOLT WAS SHEARED ALLOWING TARGET TO MOVE OCCASIONALLY. BOLT REPLACED AND GEAR SWING CHECKED OK.N PART TC: 273.