What was found
AIR TURN-BACK - PRECAUTIONARY SHUT DOWN OF NR 4 ENGINE. OIL PRESSURE LIGHT ON WITH THROTTLE AT IDLE. DURING TROUBLESHOOTING, PIECES OF METAL WERE FOUND IN THE SCAVENGE PUMP CHIP DETECTOR. ENGINE WAS REMOVED AND REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR TURN-BACK - PRECAUTIONARY SHUT DOWN OF NR 4 ENGINE. OIL PRESSURE LIGHT ON WITH THROTTLE AT IDLE. DURING TROUBLESHOOTING, PIECES OF METAL WERE FOUND IN THE SCAVENGE PUMP CHIP DETECTOR. ENGINE WAS REMOVED AND REPLACED.