Casualties unknown

Helicopter Strikes Hidden Culvert and Rolls Over During Simulated High Altitude Running Takeoff (N1103K)

Philadelphia, PA, US

On September 9, 1983, a Hughes 269C (registration N1103K) was involved in an aviation accident near Philadelphia, PA. 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

During a training flight, a helicopter collided with a steel drainage culvert hidden in grass, causing a skid to break off and the aircraft to roll over.

Accident Overview

A helicopter participating in an instructional flight experienced an accident during a simulated high altitude running takeoff. The aircraft was operating from an area to the right of a hard surface runway. The takeoff area was 200 feet wide, with drainage culverts 2 feet wide spaced 500 feet apart in the center. The grass in the area was approximately 2 inches above the lip of the drains.

Collision Sequence

The helicopter's skid struck a steel drainage culvert that was hidden in the grass. The culvert extended about 3-4 inches above ground level. The impact broke off approximately 3 feet of the skid, causing the helicopter to roll over onto its back.

Damage

The helicopter sustained damage from the rollover, including the broken skid.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X44670. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.