Casualties unknown

Engine Power Loss Leads to Hard Landing and Gear Collapse (N9796P)

Aspen Creek, AK, US

On August 26, 1991, a Piper PA-18 (registration N9796P) operated by Gary L. Bishop was involved in an aviation accident near Aspen Creek, AK. Investigators recorded the probable cause as: A sudden loss of approximately 50% engine power shortly after takeoff, despite no mechanical defects being found during post-accident inspection. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

Shortly after takeoff, the pilot experienced a significant reduction in engine power at low altitude. The subsequent hard landing caused main gear collapse and wing damage.

What happened

According to the pilot's account, the incident occurred shortly after the aircraft departed the runway. At an altitude of approximately 10 to 20 feet above ground level, the engine experienced a sudden reduction in performance, losing roughly half of its available power. Unable to maintain flight, the airplane descended rapidly and impacted the ground with significant force.

The impact caused one of the main landing gear struts to collapse. The energy of the crash also resulted in the wings striking the ground, leading to substantial structural damage to the airframe.

The investigation

Following the accident, investigators examined the aircraft to determine the root cause of the power loss. A thorough mechanical inspection was conducted on the engine and related systems. The examination revealed no defects or malfunctions that could be considered causal factors for the reported loss of power.

Probable cause

A sudden loss of approximately 50% engine power shortly after takeoff, despite no mechanical defects being found during post-accident inspection.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17755. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.