NTSB Identification: DEN84FA290.
The docket is stored on NTSB microfiche number 27052.
Accident occurred Thursday, September 13, 1984 in DENVER, CO
Aircraft: BELL 206L-3, registration: N99TV
Injuries: 2 Serious,1 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.
PLT HAD SLOWED THE HELICOPTER TO 30 KIAS USING 50 TO 60% PWR AT AN ALT OF 700 FT AGL. PLT THE HEARD 'TWO BEEPS' FROM THE ENG OUT WARNING HORN, SAW ENG OUT ANNUNCIATOR LIGHTS ILLUMINATE & THE 'TURBINE NEDDLE DROPPING.' PLT 'BOTTOMED'THE COLLECTIVE, LOWERING THE NOSE, BUT HELICOPTER DESCENDED WHILE YAWING LEFT AND RIGHT UNTIL CONTACTING A CREEK BED. INSPECTION OF THE ACFT REVEALED THE PC LINE WAS BROKEN HUST PAST THE 90 DEG BEND WHERE IT CONNECTS TO THE GAS PRODUCER FUEL CONTROL. THE OTHER END OF THE BREAK WAS CONCEALED BY A B-NUT. METALLURGICAL TESTING REVEALED THE LINE FAILED DUE TO FATIGUE. AREAS OF FRETTING AND DIMPLING WERE FOUND ON THE LINE. THE ENGINE IN N99TV WAS REMOVED FROM THE ACFT ON 11/14/83 AND AGAIN ON 9/6/84. EACH REMOVAL NECESSITATED UNFASTENING AND FASTENING OF THE PC LINE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:FUEL SYSTEM,FUEL CONTROL..FATIGUE
The National Transportation Safety Board determines the probable cause(s) of this accident to be:MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL
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