Fatal Twin-Engine Aircraft Accident Involving Unairworthy Condition

Casualties unknown • Maricopa, AZ, US

A private pilot and a passenger were killed when their twin-engine airplane crashed following an engine power issue during a local flight.

What happened

A private pilot and one passenger departed on a local flight in a twin-engine airplane. During the flight, witnesses observed that the left engine was not producing full power. The aircraft was subsequently reported overdue.

The following day, the wreckage was located approximately 22 miles from the departure airport. Both occupants sustained fatal injuries.

The investigation

The investigation determined that the aircraft was in an unairworthy condition. Specifically, the left engine primer was not locked, and the aircraft had been fueled with automotive gasoline.

Evidence indicated that the pilot intentionally secured the engines and feathered the propellers prior to impact. The airplane struck the ground in a nose-down, near wings-level attitude, characterized by a high vertical descent rate and very little forward speed.

Findings

Several contributing factors were identified during the investigation:

  • The pilot did not hold a current medical certificate or a multiengine rating.
  • Toxicological testing confirmed that alcohol was present in the blood of both the pilot and the passenger.
  • The pilot's recent flight experience could not be determined.

Probable cause

The aircraft was unairworthy due to the use of automotive gasoline and an unlocked engine primer, compounded by the pilot's decision to secure the engines and feather the propellers while under the influence of alcohol.

Frequently asked questions

What happened in the 1991-06-01 Piper PA-23 accident near Maricopa, AZ?

A private pilot and a passenger were killed when their twin-engine airplane crashed following an engine power issue during a local flight.

What aircraft was involved and where did it happen?

The accident on 1991-06-01 involved a Piper PA-23, registration N1237P, operated by Robert Tichy, at Maricopa, AZ.

What was the probable cause of the accident?

The aircraft was unairworthy due to the use of automotive gasoline and an unlocked engine primer, compounded by the pilot's decision to secure the engines and feather the propellers while under the influence of alcohol.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17024. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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