Incident at Rae Lakes, NWT

Summary

1999-08-26: The helicopter was on approach to landing when the pilot noticed a slight fuel smell followed by a loss of power. A successful landing was carried out on the Rae Lakes Airport without damage to the machine or injury to the three persons on board. Company maintenance personnel determined that fuel was leaking from the area between the ignition solenoid valve and the start drain valve. It appeared that the start drain valve may have been cross threaded onto the pressure supply tee. This is at least the third AS350 engine power loss in Canada within the last 16 months, which were precipitated by similar failures. In the previous occurrences, the TSB determined that steel threads were pulling out of the aluminum start drain valves, possibly due to hard steel threads galling relatively soft aluminum during installation. It is also possible that leverage exerted on the unsupported fittings during routine maintenance is a factor. An SDR has been submitted by the company, and the TSB is considering filing an Occurrence Bulletin in light of this latest incident. System Safety suggests Maintenance & Manufacturing contact companies who employ this type of equipment and advise them of the above stated SDRs. OPI - Maintenance & Manufacturing UPDATE M. & M. reported that the owner contacted TC and verified that the Tee Fitting pulled out of the housing on the start drain valve. The aircraft was 20 hours out from a 100 hour inspection and 120 hours since the last "T" inspection was performed. He is of the opinion that the fitting was cross- threaded or over- torqued when installed. The valve is still in the possession of the owner.

Details


CADORS Number 1999C0696
Occurrence Type Incident
Reported By Transport Canada
Occurred At 1999-07-01 - 14:00
Day or Night?
Fatalities 0
Injuries
Aerodrome ID
Aerodrome Name
Geographic Location Northwest Territories, Canada, North America, Prairie and Northern Region, Rae Lakes, NWT
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By Transport Canada
Categories System/component failure or malfunction [powerplant]
Events



Aircraft Details (1 aircraft)

Type Helicopter
 Silhouette image of Helicopter
Canadian Registration GXLE | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Owner THEBACHA HELICOPTERS LTD.
Operator Commercial
Make  Silhouette image of AEROSPATIALE
AEROSPATIALE
Model AS 350B
Year Built 1980
Engine Type Turbo shaft
Engine Make TURBOMECA ARRIEL SERIES
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number
Flight Rule
CARS Subpart
Phase of Flight Landing
Damage Unknown
Fatalities 0
Injuries 0
Events Engine - malfunction

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