What was found
AIRCRAFT NLG ACTUATOR & ATTACHING PARTS DAMAGED DURING RIGGING OPS. ALL LANDING GEAR ACTUATORS WERE BEING REPLACED WITH OVERHAULED UNITS. TO FACILITATE REMOVAL OF THE ACTUATORS, THE LANDING GEAR WAS MOVED TO THE IN-TRANSIT POSITION AND LEFT IN THAT POSITION. MAINTENANCE CREW CONTINUED THE INSTALLATION OF ACTUATORS AND RIGGING OF THE LANDING GEAR. THE NOSE GEAR ACTUATOR WAS THE FIRST TO BE INSTALLED AND IT WAS SECURED IN THE DOWN AND LOCKED POSITION. WHEN APPLYING POWER TO THE AIRCRAFT LANDING GEAR SYSTEM THE MOTOR DROVE TOWARDS THE DOWN POSITION, OVEREXTENDING THE NOSE GEAR ACTUATOR AND DRAG BRACE, SINCE IT WAS ALREADY IN THE DOWN POSITION.