NTSB Identification: FTW85FA032.
The docket is stored on NTSB microfiche number 27301.
Nonscheduled 14 CFR
Accident occurred Tuesday, October 30, 1984 in LANE CITY, TX
Aircraft: BELL 206B, registration: N1074G
Injuries: 1 Serious,2 Minor.

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.

DURING CRUISE AT 600 FT AGL A BANG WAS HEARD & ACFT EXPERIENCED A VIBRATION. WHEN TURNING TOWARD A FLD TO LAND A SECOND BANG WAS HEARD & VIBRATION CEASED. HOWEVER, AN UNCOMMANDED RT YAW WAS EXPERIENCED & THE NOSE BEGAN TO TUCK UNDER. ACFT CONTACTED TERRAIN DESPITE REMEDIAL ACTION ATTEMPT BY PLT. INVESTIGATION REVEALED TAIL ROTOR ASS'Y SEPARATED FROM ACFT INFLT. LAB EXAM REVEALED GEAR BOX ATTACHMENT STUDS FAILED DUE TO LOW CYCLE FATIGUE. TAIL ROTOR BLADE, S/N TCT-7478, HAD APRX 60% OF PHENOLIC TIP BLOCK MISSING & 3 ALUMINUM RIVETS MISSING FROM TITANIUM SKIN. NO BONDING MATERIAL WAS VISIBLE ON INTERIOR BLADE SKIN. ACFT WAS OPERATED IN A SALT WATER ENVIR. ON 4/17/82, AD 82-17-04 WAS ISSUED REQ INSPECTION OF TAIL ROTOR ASS'Y SPECIFICALLY FOR TIP BLOCK SECURITY, VOID & RETENTION EVERY 7 DAYS. AD REVISED (AD 82-17-04,R1) REQ COMPLIANCE NOT TO EXCEED 25 HR INTERVALS. ON 9/3/84 REVISION 2 REQ INSPECTION REVERTING BACK TO 7 DAY INTERVAL. OPERATOR HAD NOT RECEIVED REVISION 2 & LAST INSPECTION PERFORMED ON 10/4/84 APRX 21 HRS PRIOR TO ACCIDENT.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR GEARBOX(90 DEG)..SEPARATION

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

ROTOR SYSTEM,TAIL ROTOR BLADE..CORRODED



Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

MAINTENANCE,COMPLIANCE WITH AD..NOT FOLLOWED..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

INFORMATION UNAVAILABLE..COMPANY MAINTENANCE PERSONNEL

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