What was found
GPWS INOP AND TERRAIN FAIL IN FLIGHT UPDATED MAA CODE FIX USING VENDOR MAA SCREEN PLEASE CONTACT TOMC BEFORE COMMENCING ANY WORK. INSTALLATION. SUSPECT BAD GPWC. GPWS IS HARD FAULTING MULTIPLE FAULT LIGHTS ON LRU. WILL NOT ADDING PART AND FLAGGING FOR CAT III TEST. GPWC WAS REPLACED ON 7/5 DUE TO SOFTWARE ISSUE. CHECKED HISTORY IN SCEPTRE ON CURRENTLY INSTALLED LRU, THIS LRU HAS HISTORY OF GPWS NO TEST AND WAS PREVIOUSLY REMOVED SHORTLY AFTER ADD EMP:U412498 REMOVED AND REPLACED GPWC IAW AMM 34-46-01-400-801. OPS CHECK GOOD.PARTS USED: 64-3446-9-0004,QTY :1 PARTS USED: 64-3446-9-0004,QTY :1 ADD EMP:U412498 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1304361 SN OFF 5390 COMPUTER, EGPWC OFF 64-3446-9-0004 5390 ON 64-3446-9-0004 4676