On October 16, 1983, a Ryan NAVION (registration N4613K) was involved in an aviation accident near Ischua, NY. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft, parked for 7 months, experienced engine failure during a maintenance test flight. Both occupants sustained head injuries after an emergency landing. Post-accident inspection revealed a loose B-nut on the fuel strainer flex line.
Background
The aircraft had been parked at the airport for approximately 7 months prior to the flight. During that period, the engine had been overhauled. Before takeoff for a maintenance test flight, 37 gallons of fuel was added to the center tank. The pilot was observed working in the engine area before departure.
Flight and Emergency Landing
After takeoff, the aircraft was observed turning to a downwind leg. Shortly thereafter, the engine began to run rough and eventually quit running. During the subsequent emergency landing, the aircraft struck an embankment before reaching the runway. Both occupants sustained head injuries and could not recall details of the accident.
Post-Accident Inspection
A post-accident inspection of the aircraft revealed a loose B-nut on a flexible line leading to the fuel strainer. The exterior of the engine was found to be badly damaged. A teardown examination of the engine did not reveal any discrepancies that would have resulted in a loss of power.