No fatalities

1978-07-30: Cessna 340 (N1381G) — Casper Air Service — Riverton, United States of America

Riverton, United States of AmericaTakeoff (climb)

On July 30, 1978, a Cessna 340 (registration N1381G) operated by Casper Air Service was involved in an aviation accident near Riverton, United States of America during takeoff. No fatalities were reported. Investigators recorded the probable cause as: Powerplant failure for undetermined reasons. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 6 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 1781226370Data APIEditorial standards

An aircraft lost power in both engines at liftoff. The pilot attempted to return, performed an evasive maneuver, and executed a belly landing in an open field. The aircraft was destroyed and all three occupants were seriously injured.

Accident Summary

An aircraft experienced a complete loss of power in both engines immediately after liftoff. The pilot initially elected to return to the departure point but later decided to perform an emergency landing. During the descent, the pilot was forced to execute an evasive maneuver to avoid a collision. The aircraft subsequently completed a belly landing in an open field. The aircraft was destroyed, and all three occupants sustained serious injuries.

Sequence of Events

According to the official investigation, at the moment of liftoff, both engines lost power. The pilot made a decision to return but soon changed plans to an emergency landing. While maneuvering, the pilot had to take evasive action to prevent a collision. The aircraft ultimately touched down with its landing gear retracted, resulting in a belly landing in an open field. The impact destroyed the aircraft. All three persons on board suffered serious injuries.

Probable Cause

The official probable cause was determined to be a powerplant failure for undetermined reasons. Investigators also reported several contributing factors: improper maintenance, servicing, and inspection; issues with the fuel injection system; excessive pressure; an intentional wheels-up landing; high density altitude; and a reversed course immediately after takeoff.

Investigation Findings

The investigation could not identify the specific reason for the powerplant failure. However, multiple factors were noted as having contributed to the accident. These included deficiencies in maintenance practices, problems with the fuel injection system, and the presence of excessive pressure within the system. The decision to conduct a wheels-up landing, combined with the high density altitude and the abrupt course reversal after takeoff, were also cited as contributing elements.