NTSB Identification: DEN82FA056
14 CFR Part 91: General Aviation
Accident occurred Tuesday, April 06, 1982 in MISSOULA, MT
Probable Cause Approval Date: 04/06/1983
Aircraft: CESSNA 320F, registration: N999LS
Injuries: 3 Fatal.

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 ARRIVAL FOR AN ILS-2 APPROACH TO RUNWAY 11, THE PILOT WAS ADVISED TO HOLD AT THE KONA NDB WHILE SNOWPLOWS FINISHED CLEARING THE RUNWAY. AT THAT TIME, THE MISSOULA WEATHER WAS 1200 FT OBSCURED, 2 MI VISIBILITY WITH LIGHT SNOW AND FOG, TEMPERATURE AND DEW POINT WERE 32 AND 30 DEG RESPECTIVELY. ABOUT 1 MIN AFTER REACHING THE KONA NDB, THE PILOT DECLARED AN EMERGENCY AND REPORTED THAT BOTH ENGINES WERE BEGINNING TO LOSE POWER. AT THAT TIME, HE WAS CLEARED FOR AN IMMEDIATE APPROACH. SUBSEQUENTLY, THE PLANE COLLIDED WITH TREES AND CRASHED BETWEEN THE KONA NDB AND THE ILS OUTER MARKER. DURING AN INVESTIGATION, ALL FUEL TANKS WERE FOUND RUPTURED, BUT FUEL STAINS WERE FOUND BY BOTH TIP TANKS. NO PREIMPACT, MECHANICAL FAILURES WERE FOUND. BOTH ALTERNATE AIR HANDLES WERE FOUND CLOSED. JUST PRIOR TO CRASHING, WITNESSES HEARD THE PLANE AT LOW ALTITUDE. THEY REPORTED THAT 1 OR MORE ENGINES WERE RUNNING AND HEAVY SNOW WAS FALLING AND BLOWING.

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

POWERPLANT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

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

FUEL SYSTEM,RAM AIR/INDUCTION AIR..ICE

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

EMERGENCY PROCEDURE..IMPROPER..PILOT IN COMMAND


Contributing Factors

PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

WEATHER CONDITION..SNOW


Contributing Factors

WEATHER CONDITION..CARBURETOR ICING CONDITIONS



Contributing Factors

ANXIETY/APPREHENSION..PILOT IN COMMAND


Contributing Factors

OBJECT..TREE(S)

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