What was found
DURING CLIMB AFTER GEAR RETRACTION A VERY LOUD NOISE APPEARED AT ABOUT 4000 FT AS THOUGH A GEAR DOOR OPENED. PERFORMED GVI OF THE LANDING GEAR WITH NO DEFECTS NOTED. RETRACTED AND EXTENDED LANDING GEAR SEVERAL TIMES WITH NO DEFECTS NOTED IAW AMM 32-30-00-05. EVAL FLIGHT, SATISFACTORY.