NTSB Identification: LAX84FA371.
The docket is stored on NTSB microfiche number 27116.
Accident occurred Thursday, June 28, 1984 in PALOS VERDE EST, CA
Aircraft: HUGHES 269B, registration: N9400F
Injuries: 2 Fatal.

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.

GND WITNESSES OBSVD HELICOPTER INTO NORMAL TURN AT 500 FT AGL FOLLOWED BY A VIOLENT RT TURN. DURING THE VIOLENT TURN THE TAIL ROTOR ASSY SEPARATED & THE MAIN ROTOR BLADES CONED UPWARDS. THE HELICOPTER WENT INTO A NEAR VERTICAL DESCENT & CRASHED. WRECKAGE EXAM DISCLOSE THE TAIL ROTOR HUB TEETERING FORK BOLT & BOTH PITCH CHG LNKS SUSTAINED OVLD FRACTURES. THE FORK ASSY SHOWED EXTENSIVE BLADE IMPACT MARKS. BOTH TAIL ROTOR BLADES TRAIL EDGES EXHIBITED ABRASIVE SIGNATURES & WERE DELAMINATED. THE TAIL SKID SEPARATED & WAS FRACTURED @ MIDSPAN & ITS LT SIDE SHOWED TAIL ROTOR BLADE RUB MARKS. METAL & CHEM ANALYSIS DISCLSD THE EPOXY BONDING MATERIAL WAS WEAKENED BY A FOREIGN SUBSTANCE. BOTH TAIL ROTOR BLADES WERE XRAYED AND PAINTED 25 FLT HRS PRIOR TO THE ACCIDENT. NO EVIDENCE WAS FOUND TO INDICATE THE PILOT HAD FLOWN A HELICOPTER WITHIN 11 MONTHS PRECEDING THE ACCIDENT. THE PLT HAD ACCUMULATED 50 HELICOPTER FLT HRS, 15 OF WHICH WERE AS PIC.

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

ROTOR SYSTEM,TAIL ROTOR BLADE..FAILURE,TOTAL

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

PROCEDURES/DIRECTIVES..IMPROPER..PILOT IN COMMAND

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

LACK OF RECENT EXPERIENCE..PILOT IN COMMAND

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

ROTOR SYSTEM,TAIL ROTOR HUB COUNTERWEIGHT..SEPARATION

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

ROTOR SYSTEM,TAIL ROTOR HUB..SEPARATION

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

AUTOROTATION..NOT PERFORMED..PILOT IN COMMAND

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

ROTOR SYSTEM,TAIL ROTOR HUB PITCH LINK..OVERLOAD

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

MAINTENANCE,COMPLIANCE WITH AD..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

INFORMATION INSUFFICIENT..OTHER MAINTENANCE PERSONNEL

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

INSUFFICIENT STANDARDS/REQUIREMENTS,MANUFACTURER..MANUFACTURER

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