Aerospatiale SA315B N62338

Summary

On 7 September 1984 at about 14:50 local time, a Aerospatiale SA315B registered N62338, operated by Evergreen Helicopters, was involved in an accident near Lyman, Wyoming, United States. 5 people were on board and 5 had minor injuries. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

7 September 1984 at 14:50

Classification

Accident

Location

Lyman, Wyoming, United States

Coordinates

41.3195, -110.2999

Aircraft

Aerospatiale SA315B

Registration

N62338

Category

Helicopter

Engines

1

Operator

Evergreen Helicopters

Operating rule

Part 135: Air Taxi & Commuter

Purpose of flight

Unknown

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

DEN84LA286

5 people had minor injuries.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.