As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS WAS A TRAINING FLIGHT. DURING A GO-AROUND, ON CLIMB OUT, THE PILOTS NOTICED THAT THE VACUUM GAGE READ 0 AND THAT THEIR TWO GYRO INSTRUMENTS WERE NO LONGER WORKING. THEY PROCEEDED AROUND THE PATTERN AND LANDED WITHOUT INCIDENT. THE REMOVED PUMP HAD A SHEARED DRIVE COUPLING. WHEN THE VACUUM PORT FITTINGS WERE REMOVED, SMALL PIECES OF THE PUMP VANES CAME OUT. PUMP WAS INSTALLED ON MAY 15, 2025 AND FAILED AFTER 47.9 HOURS IN SERVICE. TEMPEST PUMP P/N AA3216CW