What was found
LOUD POP AND CLUNK VIBRATION FELT WHEN NOSE GEAR CAME DOWN SUSPECT LOUD CLUNK? DUE TO BROKEN NLG STOP BRACKET AND HISTORY OF DEFLATED NLG STRUT.REMOVED NLG OLEO CLOSURE STOP BRACKET FROM STATION 340 TUNNEL.ASSEMBLED ANGLE BRACKETS TO UPPER AND LOWER WEBS TO COMPLETE STOP BRACKET ASSY. INSTALLED RIVETS IAW DWG 162U0206.REPLACED NLG PRESSURE SWITCH ASSY WITH REF TO B747-8 MM 27-48-03.PERFORMED NOSE GEAR PRESSURE PROOF TEST WITH REF TO B747-8 MM 27-48-03. NO LEAKS NOTED