What was found
LOUD THUD AT 120 KNOTS ON T/O ROLL FOLLOWED BY HEAVY VIBRATIONS UNTIL GEAR RETRACTION. GEAR EXTENSION; LANDING AND ROLLOUT ALL NORMAL.<[01] INSP NLG PER AMM 32-21-00. NO DEFECTS. JACKED NLG PER AMM 07-10-03 AND CHECKED WHEELS FOR COND PER AMM 32-45-00.. NO DEFECTS. NLG TIRE PRES 200 PSI. PERFORMED BIRDSTRIKE CON INSP PER AMM 05-51-18. NO DEFECTS PERFORMED VIS INSP OF TAIL SKID AND ENGINE INLETS. NO DEFECTS NOTED. A/C OK FOR SERVICE.