Incident Description
About 15 minutes into an IFR cross-country flight, the pilot noticed oil streaming from the left engine and a low oil pressure indication. Despite reducing power, the low oil pressure persisted. Consequently, the pilot shut down the left engine and returned to the departure airport.
Approach and Landing
During the IFR approach, the pilot engaged the autopilot to retrieve an approach plate. The autopilot trimmed the aircraft nose-high to maintain altitude, which resulted in a stall buffet. The pilot managed to regain control of the aircraft. When visual contact with the airport was established, the pilot found the aircraft was not lined up with the proper runway. Attempting to maneuver to the intended runway, the pilot landed hard on the grass left of the runway.
Aircraft Damage
The hard landing tore off the landing gear and damaged both propellers.
Investigation Finding
Post-flight investigation revealed that a failed oil seal on the left engine starter drive assembly was the source of the oil leak.