Casualties unknown

1995-08-08: DE Havilland DHC-2 (N144Q) — Iliamna, AK

Iliamna, AK, US

On August 8, 1995, a DE Havilland DHC-2 (registration N144Q) was involved in an aviation accident near Iliamna, AK. Investigators recorded the probable cause as: The pilot's inability to outclimb rising terrain during an aborted glassy water landing maneuver, following a brief engine coughing event that recovered. 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 1781061362Data APIEditorial standards

A pilot performing a glassy water landing on a lake aborted the maneuver after flying past the intended touchdown point. The engine briefly coughed but recovered, yet the aircraft could not clear rising terrain due to insufficient climb performance.

What happened

The pilot was conducting a glassy water landing maneuver on a lake. During the approach, the airplane traveled beyond the pilot's intended touchdown point. Recognizing the situation, the pilot aborted the landing by rapidly applying power.

Following the application of power, the engine experienced a momentary irregularity, described by the pilot as coughing before returning to normal operation. Despite the engine recovering, the aircraft was unable to achieve a sufficient climb rate to clear the rising terrain along its flight path.

The investigation

The investigation focused on the mechanical status of the engine and the aerodynamic performance of the aircraft during the aborted landing phase. The pilot's statement indicated that the engine functioned normally after the initial coughing episode, suggesting that the primary limitation was not a loss of power but rather the inability to outclimb the terrain given the flight path and altitude.

Findings

The key factors contributing to the incident included:

  • The airplane flying past the intended point of landing during a glassy water approach.
  • A brief engine coughing event that recovered without further issue.
  • The inability of the aircraft to outclimb rising terrain in the direction of its flight path after the aborted landing attempt.

Probable cause

The pilot's inability to outclimb rising terrain during an aborted glassy water landing maneuver, following a brief engine coughing event that recovered.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001207X04127. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.