What was found
DURING CLIMBOUT BUT MORE NOTICEABLE ON DESCENT A SMELL LIKE METAL ON METAL WAS SMELLED THROUGHOUT THE AIRPLANE. *S/D* APU REPLACED 21 JAN DUE TO METAL FOUND ON CHIP DETECTORS. APU ALSO TOOK 2 QTS OIL. METAL CONFINED TO GEARBOX. APU DISASSEMBLED TO REPLACE GEARBOX. GEARBOX DISASSEMBLED. SOURCE OF METAL PROVED TO HIGH SPEED PINION GEAR BEARING SPINNING IN IT''S BEARING LINER. THE SPINNING WAS CAUSED BY FAILURE OF THE LINER ANTI-ROATION DEVICE IN THE LINER. THE SPINNING BEARING WORE THE ANTI-ROTATION DEVICE WHICH GENERATED THE METAL FOUND ON THE CHIP DETECTOR. ADDITIONAL SHOP FINDINGS: C-1 IMPELLER ALSO WITH ONE BENT BLADE DUE TO SOFT FOD. IMPELLER TO BE REPLACED.