NTSB Identification: DEN86FA092.
The docket is stored on NTSB microfiche number 30776.
Accident occurred Thursday, March 06, 1986 in ANACONDA, MT
Aircraft: CESSNA 177, registration: N3476T
Injuries: 3 Fatal,1 Serious.

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.

THE SOLE SURVIVING PAX SAID THE ENG LOST POWER DURING CRUISE FLIGHT OVER MOUNTAINOUS TERRAIN. THE PLT ATTEMPTED A FORCED LANDING BUT HIT A TREE AND THE ACFT CRASHED. APRX 5 GALS OF AUTOMOTIVE FUEL WERE DRAINED FROM WING TANK. FUEL SAMPLE TAKEN FROM PLT'S STORAGE TANK REVEALED SOME WATER CONTAMINATION. ACFT HAD BEEN OPERATING AT 9000 FT MSL IN BELOW FREEZING TEMP FOR APRX 1 HR, 5 MINS. ENG DISASSEMBLY REVEALED NO EVIDENCE OF FAILURE. CARBURETOR BOWL WAS CLEAN, DRY, AND ABSENT OF FUEL.

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

FLUID,FUEL..CONTAMINATION

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

AIRCRAFT SERVICE..IMPROPER..PILOT IN COMMAND

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

FLUID,WATER..FROZEN

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

FLUID,FUEL..IMPROPER


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE

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