What was found
CREW FEATHERED LEFT ENGINE IN-FLIGHT DUE TO LOW OIL PRESSURE. AIRCRAFT RETURNED TO DEPARTURE AIRPORT WITH LEFT ENGINE AT IDLE POWER AND LANDED. MAINTENANCE PERSONNEL FOUND OIL FILLER CAP ON ENGINE NOT SECURED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CREW FEATHERED LEFT ENGINE IN-FLIGHT DUE TO LOW OIL PRESSURE. AIRCRAFT RETURNED TO DEPARTURE AIRPORT WITH LEFT ENGINE AT IDLE POWER AND LANDED. MAINTENANCE PERSONNEL FOUND OIL FILLER CAP ON ENGINE NOT SECURED.