NTSB Identification: FTW85FA343.
The docket is stored on NTSB microfiche number 29315.
Accident occurred Monday, November 26, 1984 in BETHEL, OK
Aircraft: MOONEY M20J, registration: N4081H
Injuries: 1 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.

DESPITE A WX BRIEF DISCOURAGING VFR FLT THE NON-INSTRUMENT RATED PLT DEPARTED AT ABOUT 1330 CST. HIS STATED DEST WAS FT. WORTH, TX WHICH IS DUE NORTH. AFTER TAKEOFF IN VMC THE ACFT FLEW NE TOWARD AN UNKNOWN DEST. A WX STUDY INDICATED CONDITIONS ALONG THE TRACK OF FLT INCLUDED FOG, RAIN, AND THUNDERSTORMS. THE LAST PORTION OF THE FLT WAS IN THE VICINITY OF THUNDERSTORMS, HEAVY RAIN, SEVERE OR GREATER TURBULENCE, SEVERE ICING ABOVE 11,500 FT AND LOW LEVEL WIND SHEAR. RADAR PLOTS RECORDED THE ACFT GROUND TRACK AND SHOWED VERY ERRATIC AIRSPEED AND COURSE DURING APRX THE LAST 25 MIN OF FLT. 4 NEAR 180 DEG TURNS WERE MADE, ALT WAS UNKNOWN. IMPACT OCCURRED ON A WESTERLY HEADING IN ROCKY, HILLY TERRAIN GEAR AND FLAPS UP. THE DESCENT ANGLE WAS APRX VERTICAL IN AN APRX 20 DEG NOSE DOWN LEFT WING LEADING ATTITUDE. THE ELT DID NOT ACTIVATE; AIR SEARCH WAS UNSUCCESSFUL AND TERMINATED ON 12-3-84. THE WRECKAGE WAS FOUND BY A HELICOPTER ON 9-11-85 IN THE COMMERCIAL PINE TREE FOREST. INVEST REVEALED NO PRE-IMPACT MECHANICAL MALFUNCTIONS.

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

HAZARDOUS WEATHER ADVISORY..DISREGARDED..PILOT IN COMMAND

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

UNDERCONFIDENCE IN PERSONAL ABILITY..PILOT IN COMMAND

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

PROPER ALTITUDE..NOT MAINTAINED..PILOT IN COMMAND

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

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

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

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

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

DESCENT..UNCONTROLLED..PILOT IN COMMAND

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

SPATIAL DISORIENTATION..PILOT IN COMMAND

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

LACK OF TOTAL INSTRUMENT TIME..PILOT IN COMMAND

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

AIRSPEED(VS)..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY



Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN





Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

WEATHER CONDITION..ICING CONDITIONS


Contributing Factors

WEATHER CONDITION..RAIN



Contributing Factors

WEATHER CONDITION..TURBULENCE(THUNDERSTORMS)

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