What was found
PDIS 744 32-30 3672 07APR22 MEM OPEN U LANDING GEAR WOULD NOT COME DOWN. REFERENCED QRH. L/G GRAVITY EXTENSION ACCOMPLISHED. GEAR CAME DOWN. FOUND PROXIMITY DETECTOR PROCESSING UNIT (PDPU, 54GB) WITH RED FAULT LIGHT ON. RECALLED MEMORY AND THE FOLLOWING CODES WERE FOUND: #1) CODE 63, BOX LIGHT ON; AND #2) CODE 70, BOX LIGHT ON. FACT 07APR22 10:52 MEM REMOVED AND REPLACED THE PROXIMITY DETECTOR PROCESSING UNIT (54GB) REFERENCE AIRBUS A300-600 AMM 32-31-71-04. OPERATIONAL TEST GOOD. PART NAME: POSITION DETECTOR UNIT. MANUFACTURER: PETER CEM. PART NUMBER: BDM300-3. SERIAL NUMBER: 240. PERFORMED A GEAR NORMAL EXTENSION/RETRACTION TEST REFERENCE AIRBUS A300-600 AMM 32-31-00-05-0. OPERATIONAL TEST GOOD. PERFORMED A RESTORATION OF SYSTEM TO NORMAL OPERATING CONDITIONS AFTER LANDING GEAR FREE FALL EXTENSION REFERENCE AIRBUS A300-600 AMM 32-33-00-02.