What was found
GEAR WAS SELECTED UP, FOLLOWED BY NOSE DOOR OPEN MASTER WARNING, GEAR DISAGREE WARNING, STEERING INOPERATIVE, WOW INPUT CAUTION & ADVISORY. PERFORMED QRH, GEAR WAS CYCLED & EMERGENCY HANDLE PULLED, WOULD NOT STOW, GEAR LOCKED DOWN WITH 3 GREEN INDICATIONS. NOSE WHEEL STEERING DID NOT FUNCTION ON LANDING, VIOLENT SHAKING FOLLOWED NOSE WHEEL TOUCHDOWN. AN EMERGENCY WAS DECLARED, LANDED WITHOUT INCIDENT. R & R NLG ASSEMBLY IAW CHECKLIST AMM 32-21-01. PERFORMED A FUNCTIONAL TEST OF THE NOSE WHEEL STEERING SYS IAW AMM 32-51-00, FUNCTIONAL TESTED GOOD. PERFORMED AN ALIGNMENT OF THE NLG UPLOCK PIN WITH NLG UPLOCK ASSEMBLY IAW AMM 32-33-05, ALIGNMENT GOOD. FUNCTIONAL TEST OF THE EXTENSION RETRACTION SYS IAW AML 2559579. PERFORMED A POWER UP TEST OF THE PROXIMITY SENSOR SYS IAW AMM 32-61-00, POWER UP TESTED GOOD.