What was found
AFTER TAKEOFF & GEAR RETRACT APPEARED TO COMPLETE, A SHORT BUMP NOISE & FEEL UNDER COCKPIT, BUT ALL INDS APPEARED NORMAL. ON MLG EXTENSION, A SIGNIFICANT BANG & THUD, FOLLOWED BY SLIGHT VIBRATION & NOISE, DISCONTINUED APPROACH. HAD NO NLG GREEN DOWN LIGHT, A MLG DOORS & MLG DISAGREE CAUTION EICAS MESSAGE. AFTER QRH, NO INDS CHANGED. DECLARED AN EMERGENCY & LANDED UNEVENTFULLY, BROUGHT TO A FULL STOP. TOWED TO GATE. FOUND NLG RETRACT ACTUATOR ROD END BROKEN. R&R NLG MAIN RETRACT ACTUATOR IAW AMM 32-34-01-4, LEAK CK NORMAL. R & R BOTH NLG 1 & 2 LOCKED SENSORS S10065 & S10078, ALL MLG INDICATION SYS CK NORMAL IAW AMM 32-61-03-2. R & R NLG IAW AMM 32-35-00-5 32-51-00-5-3 & WC 3205600-00-02.