Casualties unknown

1984-01-12: Hiller UH-12C (N5317V) — Hector Gratacos — San Juan, PR

San Juan, PR, US

On January 12, 1984, a Hiller UH-12C (registration N5317V) operated by Hector Gratacos was involved in an aviation accident near San Juan, PR. Investigators recorded the probable cause as: The performer falling from a trapeze rigged below the helicopter while it was hovering, due to an unauthorized aircraft modification and the pilot's lack of certification for external load operations. 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
Aircraft registered N5317V
Aircraft registered N5317V. Photo: James from Cheltenham, Gloucestershire / CC BY-SA 2.0, via Wikimedia Commons

A performer fell from a trapeze rigged below a hovering helicopter at approximately 150 feet above ground level during an unauthorized aerial stunt.

What happened

During a flight operation, a performer fell from a trapeze structure that had been rigged beneath the aircraft. The helicopter was maintaining a hover at an altitude of approximately 150 feet above ground level (AGL) when the incident occurred.

The modification required to rig the trapeze below the helicopter had not received authorization from the Federal Aviation Administration (FAA). Additionally, the pilot operating the aircraft was not certified to conduct external load operations, which is typically required for such configurations.

The investigation

Post-incident information indicated that the performer had reportedly never performed this specific act before. Reports also suggested that the individual was not in excellent physical condition at the time of the event.

Findings

The incident involved multiple regulatory and operational failures. The primary factors included the lack of FAA authorization for the aircraft modification and the pilot's lack of certification for external load operations. The performer's inexperience with the stunt and physical state were also noted as relevant circumstances.

Probable cause

The performer falling from a trapeze rigged below the helicopter while it was hovering, due to an unauthorized aircraft modification and the pilot's lack of certification for external load operations.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X38623. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.