Casualties unknown

Helicopter Pilot Lost During IMC Flight Attempt Along Texas Coast (N5791N)

High Island AO6, US

On January 23, 1990, an Aerospatiale AS355F-1 (registration N5791N) operated by Petroleum Helicopters Inc. was involved in an aviation accident near High Island AO6. Investigators recorded the probable cause as: UNDETERMINED DUE TO THE LACK OF PHYSICAL EVIDENCE. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 4 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

A helicopter pilot flying from an offshore location to an onshore base in Texas encountered IMC conditions with fog. The pilot changed destinations multiple times before last contact 20 miles offshore. The pilot and helicopter were not recovered; only parts were found.

Incident Overview

A helicopter pilot was attempting to fly from an offshore location to a company onshore base along the Texas coast. Weather conditions were instrument meteorological conditions (IMC) along the entire coast, with fog reported both on and offshore. During the flight, the pilot elected on several occasions to change destinations in an attempt to get onshore.

Communications and Search

The last communications with the pilot indicated the helicopter was approximately 20 miles offshore from its intended destination. Following the loss of contact, a search was conducted. The pilot and the helicopter were not recovered; however, several parts from the helicopter were recovered and identified.

Aircraft and Pilot Information

The helicopter was equipped for basic visual flight rules (VFR) flight only. The pilot lacked recent instrument flight time, as per the investigation report.

Conclusion

The investigation did not provide a specific probable cause for the loss. The circumstances surrounding the flight, including the weather conditions and the pilot's actions, were documented.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22427. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.