NTSB Identification: MIA89FA004.
The docket is stored on NTSB microfiche number 37837.
Accident occurred Wednesday, October 05, 1988 in VERO BEACH, FL
Probable Cause Approval Date: 12/03/1989
Aircraft: HUGHES 269C, registration: N8602F
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLT STATED THAT WHILE DOING A STUCK LEFT PEDAL MANEUVER, THE HELICOPTER WAS FLOWN WITH A 5 DEGREE YAW TO THE LEFT. AS THE AIRSPEED ZEROED, THE COLLECTIVE WAS BROUGHT IN TO BRING THE NOSE AROUND AND LIGHT CONTACT WAS MADE WITH THE GROUND. HE THEN STATED THAT GROUND RESONANCE STARTED AND PROGRESSED SO RAPIDLY THAT THE HELICOPTER DESTROYED ITSELF ALMOST IMMEDIATLY. POST ACCIDENT EXAMINATION OF THE THREE BLADE FRICTION DAMPERS REVEALED EVIDENCE THAT SUGGESTS THAT THE MAJORITY OF THE BRONZE PLATES INSIDE THE DAMPERS WERE WORN BEYOND ACCEPTABLE LIMITS. THE PILOT REPORTED THAT HE HAD STOPPED THREE TIMES DURING THE FLIGHT TO RE-PHASE THE MAIN ROTOR SYSTEM.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTORCRAFT FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..CONTINUED..PILOT IN COMMAND(CFI)

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

IN-FLIGHT PLANNING/DECISION..POOR..PILOT IN COMMAND(CFI)


Contributing Factors

ROTOR SYSTEM,MAIN ROTOR HUB LEAD-LAG STOP/DAMPER..WORN

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