On August 5, 2001, a Schweizer 269C (registration N6129M) was involved in an aviation accident near Waterloo, IN. Investigators recorded the probable cause as: Aircraft control not maintained for undetermined reasons. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter crashed into terrain during a night approach to a private landing pad. The pilot held an expired special issuance medical certificate, and wreckage analysis showed no torsional signatures on the flight controls.
What happened
The aircraft was operating at night when it impacted terrain while conducting an approach to the pilot's private landing pad. The specific registration of the helicopter is not provided in the source text.
The investigation
Examination of the wreckage revealed the absence of torsional signatures on the flight control components. Due to the extent of impact and fire damage, only partial flight control continuity could be established during the examination.
Findings
The pilot was issued a special issuance medical certificate that had expired approximately five months prior to the accident. The pilot operated the aircraft with an expired medical certificate.