NTSB Identification: LAX87FA066.
The docket is stored on NTSB microfiche number 35041.
Accident occurred Saturday, December 20, 1986 in FLAGSTAFF, AZ
Probable Cause Approval Date: 04/25/1988
Aircraft: MOONEY M20K, registration: N4004H
Injuries: 1 Fatal,1 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.

THE PILOT ENCOUNTERED CLOUDS AND TEMPERATURES BELOW FREEZING DURING A CROSS COUNTRY FLIGHT AT 17,500 FEET ABOVE MEAN SEA LEVEL. THE ENGINE FAILED SHORTLY AFTER THE ENCOUNTER WITH THE WEATHER. THE PILOT WAS UNABLE TO RESTART THE ENGINE DURING THE FORCED LANDING DESCENT AND COLLIDED WITH THE TERRAIN AT AN ELEVATION OF 6110 FEET MSL. AN EXAMINATION OF THE ENGINE ENDUCTION SYSTEM REVEALED A COATING OF GLOBULAR ICE FORMATION AND CRYSTALS ON THE INDUCTION AIR FILTER. THE ALTERNATE AIR DOOR WAS CLOSED AND THE ALTERNATE AIR CONTROL WAS IN THE FILTERED POSITION.

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

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

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

FLIGHT MANUALS..NOT FOLLOWED..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:

INDUCTION AIR CONTROL/SYSTEM..NOT SWITCHED


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

WEATHER CONDITION..SNOW


Contributing Factors

IN-FLIGHT BRIEFING SERVICE..NOT OBTAINED..PILOT IN COMMAND

Index for Dec1986 | Index of months