What was found
PUMP HAD DRIVE COUPLING CHANGED AT THE FACTORY TO C/W AD 98-23-01. ALL PRECAUTIONS WERE TAKEN AT INSTALLATION, BUT VANES FAILED FOR UNKNOWN REASON.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PUMP HAD DRIVE COUPLING CHANGED AT THE FACTORY TO C/W AD 98-23-01. ALL PRECAUTIONS WERE TAKEN AT INSTALLATION, BUT VANES FAILED FOR UNKNOWN REASON.