NTSB Identification: DEN87FA008.
The docket is stored on NTSB microfiche number 32843.
Accident occurred Wednesday, October 22, 1986 in BUFFALO, WY
Probable Cause Approval Date: 06/07/1988
Aircraft: MOONEY M20B, registration: N74739
Injuries: 1 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.

AT APRX 1720 MDT, TOWER PSNL AT THE DEP ARPT RECEIVED A PHONE CALL FROM THE PLT. HE SAID HE WISHED TO DEPART WITH AN INOP 2-WAY RADIO. HE WAS ADVISED THAT IMC PREVAILED & THAT A RADIO WOULD BE REQUIRED TO DEPART WITH AN IFR OR SPECIAL VFR CLNC. AT 1907 (AFTER OBTAINING A PORTABLE 2-WAY RADIO) THE NON-INSTRUMENT RATED PLT REQUESTED & RECEIVED CLNC FOR A SPECIAL VFR DEPARTURE. HE TOOK OFF WITH A PAX ABOARD, & AT 1917, RPRTD CLEAR OF THE CONTROL ZONE. SUBSEQUENTLY, THE ACFT CRASHED IN MTNS AT AN ELEV OF ABOUT 9500'. INITIAL IMPACT WAS WITH TREES ON RISING TERRAIN AS THE ACFT WAS IN WINGSLVL FLT. THE SURVIVING PAX RPRTD ICE ON THE WINGS & SAID THE ENG WAS RUNNING ROUGH. ALSO, HE SAID THEY WERE FLYING IN SNOW, & WHEN THE PLT PULLED THE CARB HEAT CTL, IT CAME OUT IN HIS HAND; THE CABLE WAS FND BROKEN NR THE BUTTERFLY VLV & ICE & SNOW WERE FND IN THE CARB AIR INTAKE OPENING. CHECKS OF THE PLT'S BLOOD & URINE SHOWED ALCOHOL LVLS OF 0.031% & 0.034%, RESPECTIVELY. COCAINE, METHYL ECGONINE & METHAMPHETAMINE WERE DETECTED IN HIS URINE, BUT NONE FND IN HIS BLOOD.

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

JUDGMENT..POOR..PILOT IN COMMAND

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

IMPAIRMENT(ALCOHOL)..PILOT IN COMMAND

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

FUEL SYSTEM,RAM AIR/INDUCTION AIR..BLOCKED(PARTIAL)

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

CARBURETOR HEAT CONTROL,CABLE/PUSH-PULL ROD..FAILURE,TOTAL


Contributing Factors

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


Contributing Factors

PROCEDURES/DIRECTIVES..NOT FOLLOWED..PILOT IN COMMAND



Contributing Factors

COMM/NAV EQUIPMENT..INOPERATIVE


Contributing Factors

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

FLIGHT INTO KNOWN ADVERSE WEATHER..INITIATED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

WEATHER CONDITION..CLOUDS


Contributing Factors

WEATHER CONDITION..SNOW


Contributing Factors

WEATHER CONDITION..ICING CONDITIONS


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WING..ICE




Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..RISING

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