Casualties unknown

Helicopter Dynamic Rollover After Skid Strikes Hatch Cover on Offshore Helideck (N22713)

Ship Shoal 241, US

On September 13, 1984, a Bell 206B III (registration N22713) was involved in an aviation accident near Ship Shoal 241. 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 2026-07-04Data APIEditorial standards

During hover after landing on an offshore helideck, a helicopter's skid struck a protruding hatch cover, causing a dynamic rollover and crash onto a lower rig level.

Incident Overview

A helicopter pilot conducted a landing on an offshore helideck that already had one parked aircraft. After all passengers had disembarked and cleared the area, the pilot initiated a hover takeoff. While hovering, the helicopter drifted slightly, causing one skid to strike a hatch cover that protruded 8.5 feet above the helideck surface. The hatch cover was located approximately 3.5 feet inward from the deck edge.

Dynamic Rollover and Crash

The impact with the hatch cover caused the helicopter to pivot around the contact point, initiating a dynamic rollover. The aircraft subsequently rolled off the helideck and crashed onto a lower level of the oil rig. No further details about the aircraft, occupants, or injuries were provided in the source material.

Operational Context

The helideck had one aircraft already parked on it at the time of landing. The protruding hatch cover was a fixed structure on the deck, and the pilot allowed the helicopter to drift during the hover, leading to the skid strike. The sequence of events—drift, contact, pivot, and dynamic rollover—resulted in the aircraft departing the deck and impacting the rig's lower level.

Frequently asked questions

What happened in the 13 Sept 1984 Bell 206B III accident near Ship Shoal 241?

During hover after landing on an offshore helideck, a helicopter's skid struck a protruding hatch cover, causing a dynamic rollover and crash onto a lower rig level.

What aircraft was involved and where did it happen?

The accident on 13 Sept 1984 involved a Bell 206B III, registration N22713, at Ship Shoal 241.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X41077. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.