Casualties unknown

Pilot loses control of aircraft during landing rollout at short wet runway (N25SA)

Lower Loon, ID, US

On October 10, 1986, a Britten-norman BN-2A-20 (registration N25SA) operated by Mountain Bird, Inc. was involved in an aviation accident near Lower Loon, ID. Investigators recorded the probable cause as: The pilot's failure to maintain directional control during the landing rollout, which resulted in the collapse of the right main gear. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards
Aircraft registered N25SA
Aircraft registered N25SA. Photo: RuthAS / CC BY-SA 3.0, via Wikimedia Commons

A pilot diverted due to weather landed at an alternate airport with a tailwind. Heavy braking on wet sod caused the brakes to lock, leading to a veer off the runway and collapse of the right main gear.

What happened

The pilot had diverted from his original destination because of adverse weather conditions. Upon arriving at the alternate airport, he attempted to land with a 7 knot tailwind. The airstrip was notably short, measuring only 1100 feet in length.

During the landing rollout, the pilot applied heavy braking on the wet sod surface. This action caused the brakes to lock up completely. As a result, the aircraft veered to the right of the centerline. The right main gear left the paved or prepared surface and struck rough terrain. The impact caused the right main gear to collapse. Subsequently, the right wing dragged along the ground.

The investigation

The investigation focused on the mechanics of the landing and the condition of the runway. It was determined that the combination of a tailwind, a short runway, and wet sod conditions contributed to the loss of directional control. The locking of the brakes on the soft surface prevented the pilot from maintaining the centerline.

Findings

Contributing factors included:

  • A 7 knot tailwind during landing
  • Wet sod runway surface
  • Heavy braking causing locked wheels
  • Short airstrip length (1100 feet)
  • Veering off the right side of the centerline
  • Collapse of the right main gear due to rough terrain contact

Probable cause

The pilot's failure to maintain directional control during the landing rollout, which resulted in the collapse of the right main gear.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X35075. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.