ASN logo
Date:Thursday 9 May 1985
Type:Silhouette image of generic CAT model; specific model in this crash may look slightly different
Consolidated PBY-5A Catalina
Operator:Drilling Muds
Registration: N84857
MSN: 1522
First flight:
Total airframe hrs:1481
Engines: 2 Pratt & Whitney R-1830-94
Crew:Fatalities: 1 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 1
Total:Fatalities: 1 / Occupants: 3
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:Lewistown Municipal Airport, MT (LWT) (   United States of America)
Phase: Standing (STD)
Departure airport:Lewistown Municipal Airport, MT (LWT/KLWT), United States of America
Destination airport:Reno/Tahoe International Airport, NV (RNO/KRNO), United States of America
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
acft/equip inadequate,visual restriction..copilot/second pilot
hydraulic system,reservoir..low level
crew/group coordination..poor..pilot in command
anti-ice/deice system,propeller..unmarked

Brake problem
Damaged on the ground



Add your photo of this accident or aircraft

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.
languages: languages


The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2022 Flight Safety Foundation

701 N. Fairfax St., Ste. 250
Alexandria, Virginia 22314