Casualties unknown

1984-08-31: Piper PA-12 (N3988M) — Montague Island, AK

Montague Island, AK, US

On August 31, 1984, a Piper PA-12 (registration N3988M) was involved in an aviation accident near Montague Island, AK. Investigators recorded the probable cause as: The pilot's failure to maintain proper airspeed and descent rate during the final approach, resulting in a hard landing that exceeded the structural limits of the landing gear system. 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

Aircraft sustained landing gear collapse after a hard landing on a short gravel strip. The pilot reported broken bungee cords and lack of safety cables contributed to the failure.

What happened

The aircraft was involved in an incident during the landing phase at a narrow gravel airstrip oriented north-south with a length of approximately 1600 feet. According to the pilot, the aircraft touched down with excessive force, resulting in a hard landing. This impact caused the main landing gear assembly to collapse.

The investigation

Post-incident examination revealed that the bungee cords associated with the landing gear mechanism had fractured. The pilot noted that the absence of a safety cable allowed the gear structure to fail completely under the stress of the impact. No other mechanical failures were cited in the immediate narrative.

Findings

The primary factor leading to the damage was the hard landing itself. The structural integrity of the landing gear system was compromised by the broken bungee cords, which were not supported by a secondary safety cable as might be expected in some configurations. The short and narrow nature of the gravel strip likely contributed to the difficulty in achieving a controlled touchdown.

Safety message

Operators should ensure that all safety cables and retention mechanisms are installed and functional to prevent total gear collapse during abnormal landing impacts. Regular inspection of bungee cords is critical for maintaining landing gear reliability.

Probable cause

The pilot's failure to maintain proper airspeed and descent rate during the final approach, resulting in a hard landing that exceeded the structural limits of the landing gear system.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X40559. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.