What was found
(CAN) THE 60 AMP BREAKER THAT PROTECTS THE HYDRAULIC LANDING GEAR PUMP MOTOR CIRCUIT TRIPPED WHEN THE GEAR WAS RETRACTED AFTER TAKE OFF. THE CREW ELECTED TO BLOW THE GEAR DOWN AND RETURNED TO BASE WITHOUT FURTHER INCIDENT. HYDRAULIC SYSTEM ON THIS AIRCRAFT ORIGINALLY HAD A 120 AMP BREAKER IN THIS CIRCUIT BUT IT WAS CHANGED TO 60 AMPS TO COMPLY WITH AD 95-13-03. THIS AD WAS INTENDED FOR MECHANICAL RETRACTION SYSTEM. THE HYDRAULIC SYSTEM HAS A 100 AMP MOTOR WHICH RUNS LONGER THAN THE MECHANICAL SYSTEM AND IS PRONE TO NUISANCE TRIPS OF THE 60 AMP BREAKER. THE AD SHOULD BE NOTED AS NOT APPLYING TO HYDRAULIC SYSTEMS WHICH SHUTS OFF BY VIRTUE OF A HYDRAULIC PRESSURE SWITCH.