What was found
DURING E.O. INSPECTION, VALVE FAILED STEP 3. FLAP VALVE MOVED COMPLETELY FREE WITH NO DAMPING ACTION ABOUT THE HOLLOW RIVET. REMOVED AND REPLACED VALVE ASSY. (X)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING E.O. INSPECTION, VALVE FAILED STEP 3. FLAP VALVE MOVED COMPLETELY FREE WITH NO DAMPING ACTION ABOUT THE HOLLOW RIVET. REMOVED AND REPLACED VALVE ASSY. (X)