Accident
Last updated: 23 October 2014
Status:Schlussbericht
Datum:Donnerstag 9 Mai 1985
Zeit:08:44
Flugzeugtyp:Consolidated PBY-5A Catalina
Fluggesellschaft:Drilling Muds
Kennzeichen: N84857
Werknummer: 1522
Baujahr:
Betriebsstunden:1481
Triebwerk: 2 Pratt & Whitney R-1830-94
Besatzung:Todesopfer: 1 / Insassen: 2
Fluggäste:Todesopfer: 0 / Insassen: 1
Gesamt:Todesopfer: 1 / Insassen: 3
Sachschaden: schwer beschädigt
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Lewistown Municipal Airport, MT (LWT) (   USA) show on map
Flugphase: Stehendes (STD)
Betriebsart:Kontrollflug
Flug von:Lewistown Municipal Airport, MT (LWT/KLWT), USA
Flug nach:Reno/Tahoe International Airport, NV (RNO/KRNO), USA
Unfallbericht:
During taxi to takeoff the brakes failed. The pilot attempted to groundloop the aircraft, which rolled down hill and collided with a gully. During preflight the co-pilot inadvertently added hydraulic fluid in the alcohol tank. The hydraulic pump cavitated.

PROBABLE CAUSE:
aircraft preflight..inadequate..pilot in command
hydraulic system..pressure too low
brakes(emergency)..not used..pilot in command
aircraft service..improper..copilot/second pilot
safety system(other)..not engaged
emergency procedure..not followed..pilot in command
supervision..poor..pilot in command
CONTRIBUTING FACTORS:
fluid,hydraulic..inadequate
acft/equip inadequate,visual restriction..copilot/second pilot
hydraulic system,reservoir..low level
window,inspection/observation..blocked(partial)
crew/group coordination..poor..pilot in command
anti-ice/deice system,propeller..unmarked

Informationsquelle:
» NTSB


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Lewistown Municipal Airport, MT to Reno/Tahoe International Airport, NV as the crow flies is 1173 km (733 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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