Casualties unknown

2005-05-04: Piper PA-31T (N2338V) — Bismarck, ND

Bismarck, ND, US

On May 4, 2005, a Piper PA-31T (registration N2338V) was involved in an aviation accident near Bismarck, ND. Investigators recorded the probable cause as: Rupture of the hydraulic powerpak drain line which resulted in a loss of hydraulic fluid and the inability to properly lower the landing gear despite the pilot's execution of the emergency extension procedures. 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

During approach, the pilot could not lower the landing gear. Diverting to a better-equipped airport, emergency gear extension failed. The left main gear appeared extended, nose gear dragged, right main was retracted. An emergency landing resulted in substantial damage. Post-accident inspection revealed a ruptured hydraulic powerpak drain line.

Incident Details

During an approach to the intended destination, the pilot attempted to lower the landing gear, but nothing happened. The pilot elected to divert to an airport with additional capabilities and assistance. The emergency gear extension procedure was executed but was not successful. Before landing, the tower controller observed that the left main landing gear appeared fully extended, the nose landing gear was in a dragging condition, and the right main landing gear remained retracted. The pilot noted that the red gear unlocked indicator light was illuminated and the green landing gear down/locked indicators were not illuminated.

Emergency Landing

With no further options available to extend the gear, the pilot executed an emergency landing. The airplane touched down on the left main wheel, which initially did not collapse. Subsequently, the right wing dropped and contacted the runway. The pilot applied left wheel brakes, but the airplane departed the right side of the runway pavement and came to rest in the grass. During the landing, the left main landing gear collapsed and a runway light was damaged.

Post-Accident Inspection

The post-accident inspection revealed that a hydraulic powerpak drain line (Piper part number 46138-00) was ruptured. The drain line was located in the nose section of the airplane, forward of the cabin pressure bulkhead. The rupture was approximately one-half inch long. Hydraulic fluid was observed in the vicinity of the line rupture, and the hydraulic reservoir was empty. The airplane was substantially damaged during the emergency landing.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20050506X00570. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.