As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON SHORT FINAL, N1 NEEDLE ON TRIPLE TACH STUCK AT 69%. T/F EVALUATION REVEALED TRIPLE TACH #1 NEEDLE WAS FOUND STUCK AT 69% IN STATIC CONFIGURATION. #1 NEEDLE FELL TO ZERO AND WOULD NOT MOVE DURING TRIPLE TACH CHECK UPON APPLICATION OF BATTERY POWER. REPLACED TRIPLE TACH (IPC: 77-14-01-01-10B); T/F MOC SUCCESSFULLY COMPLETED.