Casualties unknown

Conventional Gear Aircraft Departs Runway During Rollout (N4127Z)

Anchorage, AK, US

On April 1, 1983, a Piper PA-18-150 (registration N4127Z) operated by Clifford A. Pulis was involved in an aviation accident near Anchorage, AK. Investigators recorded the probable cause as: The pilot's failure to maintain directional control during the landing rollout, which resulted in the aircraft leaving the runway and nosing down into muskeg terrain. 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 2026-06-10Data APIEditorial standards

A conventional gear aircraft veered left during rollout after a full-stop landing, leaving the runway and nosing down into adjacent muskeg terrain.

What happened

The aircraft experienced a ground loop event while executing a full-stop landing. Prior to this final approach, the pilot had successfully completed several touch-and-go landings in the same conventional gear aircraft. The touchdown phase of the last landing was reported as normal; however, during the subsequent rollout, the aircraft began to veer toward the left side of the runway.

In response to the deviation, the pilot applied opposite rudder input and utilized braking procedures while adding a small amount of power in an attempt to maintain directional control. Despite these corrective actions, the aircraft departed the paved surface. It continued off the runway environment and nosed down into the muskeg terrain situated alongside the runway.

The investigation

The factual narrative indicates that the pilot had prior experience with the specific aircraft type during the same flight session, having performed multiple touch-and-go maneuvers immediately preceding the incident. The initial touchdown was characterized as normal, suggesting no immediate issue with approach speed or alignment at impact. The loss of control occurred specifically during the ground roll phase.

Findings

The primary factor in this event was the loss of directional control during the landing rollout. The aircraft's departure from the runway and subsequent nosing down into the muskeg were direct results of the leftward veer that could not be arrested by standard rudder, brake, and power applications. The terrain type, identified as muskeg, likely contributed to the severity of the nose-down attitude once off the pavement.

Safety message

This incident highlights the critical importance of maintaining directional control during the rollout phase of landings in conventional gear aircraft. Pilots must be prepared for immediate and effective corrective action if veering occurs, particularly after a series of maneuvers that may affect pilot fatigue or situational awareness.

Probable cause

The pilot's failure to maintain directional control during the landing rollout, which resulted in the aircraft leaving the runway and nosing down into muskeg terrain.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X42323. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.