Event Summary
A private pilot experienced unusual engine vibrations and noise while in flight and decided to perform an emergency landing in an open field. During the landing roll, the right main landing gear encountered a hole, causing the gear to collapse.
Investigation Findings
Post-accident examination of the engine disclosed that one of the spark plug leads was loose. Additionally, the aircraft had not undergone an inspection within the previous 12 months. The pilot-owner did not hold a current biennial flight review or a valid FAA medical certificate.
Aircraft and Pilot Information
The aircraft involved was a single-engine airplane operated by a private pilot who also owned the aircraft. No further details about the aircraft type, registration, or pilot qualifications beyond the noted deficiencies were provided in the source.
Damage Assessment
The accident resulted in damage to the right main landing gear, which collapsed upon striking the hole. The extent of other damage was not specified in the source.