NTSB Identification: DEN85FA131.
The docket is stored on NTSB microfiche number 29237.
Accident occurred Thursday, May 09, 1985 in LEWISTOWN, MT
Aircraft: Consolidated-Vultee PBY-5A, registration: N84857
Injuries: 1 Fatal,2 Minor.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING TAXI TO TAKEOFF THE BRAKES FAILED. THE PLT ATTEMPTED TO GROUNDLOOP THE ACFT. THE ACFT ROLLED DOWN HILL AND COLLIDED WITH A GULLY. THE PLT WAS FATALLY INJURED. DURING PREFLIGHT THE CO-PLT INADVERTENTLY ADDED HYDRAULIC FLUID IN THE ALCOHOL TANK. THE HYDRAULIC PUMP CAVITATED. THE PLT FAILED TO USE THE HYDRAULIC EMERGENCY HAND PUMP OR THE A.C. ELECTRIC PUMP.

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

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND

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

HYDRAULIC SYSTEM..PRESSURE TOO LOW

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

BRAKES(EMERGENCY)..NOT USED..PILOT IN COMMAND

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

SAFETY SYSTEM(OTHER)..NOT ENGAGED

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

AIRCRAFT SERVICE..IMPROPER..COPILOT/SECOND PILOT

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

EMERGENCY PROCEDURE..NOT FOLLOWED..PILOT IN COMMAND

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

SUPERVISION..POOR..PILOT IN COMMAND





Contributing Factors

FLUID,HYDRAULIC..INADEQUATE



Contributing Factors

ACFT/EQUIP INADEQUATE,VISUAL RESTRICTION..COPILOT/SECOND PILOT


Contributing Factors

HYDRAULIC SYSTEM,RESERVOIR..LOW LEVEL


Contributing Factors

WINDOW,INSPECTION/OBSERVATION..BLOCKED(PARTIAL)


Contributing Factors

CREW/GROUP COORDINATION..POOR..PILOT IN COMMAND


Contributing Factors

ANTI-ICE/DEICE SYSTEM,PROPELLER..UNMARKED

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