Prior To The Accident Flight, The Pilot Reported Experiencing Vibrations In The Helicopter

Location: Anderson, South Carolina Accident Number: ERA23LA289
Date & Time: June 27, 2023, 17:30 Local Registration: N90270
Aircraft: Hughes 269A Aircraft Damage: Substantial
Defining Event: Ground resonance Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Flight test

Analysis: Prior to the accident flight, the pilot reported experiencing vibrations in the helicopter. The pilot (who was also a mechanic) and another mechanic adjusted the main rotor dampers to address the issue. Following this adjustment, a 10-minute ground run was performed without any observed problems. The pilot then conducted a test flight during, which no issues were detected. Upon landing and while reducing the rotor rpm, the helicopter began to shake violently. The pilot attempted to perform the ground resonance recovery procedure and climbed the helicopter, but the vibration worsened, and he subsequently landed. After contacting the ground, the helicopter shook and spun uncontrollably before coming to a stop. The airframe and main rotor were substantially damaged during the accident sequence.

Federal Aviation Administration inspectors examined the helicopter after the accident and found that the yellow main rotor blade’s damper had significantly higher torque than the red and blue blades, and that none of the dampers were torqued to the specification in the helicopter’s maintenance manual. The manual also described that incorrect torque adjustments of the dampers could result in “…conditions that may result in ground resonance and destruction of the helicopter. During a subsequent discussion with the assisting mechanic, he stated that he, “may have unintentionally over-torqued the blade [damper].” Based on this information, it is likely that the mechanics’ improper maintenance of the helicopter’s main rotor dampers resulted in the ground resonance event experienced at the conclusion of the post maintenance test flight test flight.

Probable Cause and Findings: The National Transportation Safety Board determines the probable cause(s) of this accident to be -- The mechanics’ improper torquing of the main rotor blade dampers, which resulted in a ground resonance event during landing. 

FMI: www.ntsb.gov