NTSB Identification: DEN84LA286.
The docket is stored on NTSB microfiche number 25939.
Nonscheduled 14 CFR
Accident occurred Friday, September 07, 1984 in LYMAN, WY
Aircraft: AEROSPATIALE SA315B, registration: N62338
Injuries: 5 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT STATED THAT ENGINE RPM BEGAN DETERIORATING DURING A CLIMB TO CRUISE FLT. HE RETURNED TO THE LANDING SITE WHERE THE RPM DECAYED TO FLT IDLE, AN AUTOROTATION WAS ENTERED AND A HARD LANDING RESULTED. THE ENGINE RAN FOR 1 HOUR IN A TEST CELL AFTER THE ACCIDENT AND NO EVIDENCE OF A MALFUNCTION WAS FOUND. THE FUEL SPEED GOVERNOR WAS REMOVED, TESTED AND FOUND TO FUNCTION NORMALLY HOWEVER DURING THE REMOVAL OF THE FUEL METERING SYSTEM PART OF AN 'O' RING WAS FOUND IN A SPRING NEXT TO THE FUEL PORTS. THE 'O' RING FRAGMENT COULD HAVE BLOCKED ONE OF THE FUEL PORTS ALLOWING THE RPM TO DROP TO FLIGHT IDLE.

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

FUEL SYSTEM,FUEL CONTROL..FOREIGN OBJECT

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

FLARE..INADEQUATE..PILOT IN COMMAND

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

FUEL SYSTEM,LINE..BLOCKED(PARTIAL)


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