Tail Rotor Separation Leads to Hard Landing and Rollover During Power Line Patrol (N5093Y)

Q: What aircraft was involved and where did it happen?

The accident on 1988-02-16 involved a Hughes 369D, registration N5093Y, operated by Haverfield Helicopters, at Waterfall, PA.

On February 16, 1988, a Hughes 369D (registration N5093Y) operated by Haverfield Helicopters was involved in an aviation accident near Waterfall, PA. Investigators recorded the probable cause as: Tail rotor separation in flight. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

A helicopter engaged in power line patrol experienced a tail rotor separation shortly after takeoff, leading to a hard landing that resulted in the aircraft rolling onto its side.

Incident Overview

Shortly after takeoff, the pilot of a helicopter conducting power line patrol heard a loud 'boom' and subsequently lost tail rotor control. The loss of control was accompanied by an increase in N2 and RPM. The pilot made a radio transmission to the trailing aircraft and then set up an approach for landing.

Landing and Sequence of Events

During the landing, the helicopter touched down hard but remained level, with its skids aligned with the final approach path. The helicopter then bounced several times before coming to rest on its right side, approximately 45 feet from the second touchdown point.

Investigation Findings

Investigation revealed that the tail rotor had separated from the helicopter in flight. The tail rotor was found about 3/4 mile from the accident site. Additionally, a flight bag from the helicopter was located 300 yards farther away, with tail rotor paint on it.

Aircraft Configuration

The helicopter was being operated without doors due to its use in power line patrol.

Probable cause

Tail rotor separation in flight

1988-02-16: Hughes 369D (N5093Y) — Haverfield Helicopters — Waterfall, PA