What was found
NOSE GEAR COLLAPSED DURING A TOUCH-AND-GO WHEN POWER WAS APPLIED FOR A TAKEOFF. INVEST REVEALED: LT FWD DRAG BRACE ATTACH BOLT LOOSE (COTTER PIN WAS INSTALLED), INCORRECT WASHERS WERE INSTALLED (BASED ON PARTS MANUAL). DOWNLOCK HOOK PIVOT BOLT WAS PARTIALLY SEIZED (HOOK VERY SLOW TO LOCK EVEN WITH ACTUATOR DISCONNECTED). THE PIVOT BOLT AND BUSHINGS BETWEEN THE UPPER AND LOWER DRAG BRACE WERE VERY WORN AT DOWNLOCK ASSY. NOSE GEAR DOWNLOCK SWITCH WAS NOT ADJUSTED PER THE MM. ALL THE PARTS STATED ABOVE ARE TO BE REPLACED AND/OR LUBRICATED AND REINSTALLED IAW MM.