NTSB Identification: FTW83FA009
14 CFR Part 91: General Aviation
Accident occurred Wednesday, October 06, 1982 in HEBBRONVILLE, TX
Probable Cause Approval Date: 10/06/1983
Aircraft: CESSNA 210L, registration: N732KH
Injuries: 4 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.

THE CREW WERE ADVISED THAT THE ACFT'S VACUUM PUMP SYSTEM WAS INOPERATIVE DUE TO A SHEARED PUMP DRIVESHAFT. THE COPILOT HAD STATED THAT FSS HAD FORECAST 25,000 FT BROKEN & HE DID NOT FEEL HE WOULD NEED THE PUMP. AT 1735 THE PLT CONTACTED CENTER & REQUESTED RADAR ADVISORIES TO BROWNSVILLE. AT 1812 THE PILOT REQUESTED & WAS GRANTED PERMISSION TO DEVIATE AROUND A CELL. 12 MINUTES LATER THE TARGET DISAPPEARED. WRECKAGE EXAMINATION REVEALED THAT THE TAIL & RIGHT WING HAD SEPARATED IN FLIGHT. THERE WAS A VIP LEVEL 1 ECHO WITHIN 5 MI EAST & A VIP LEVEL 3 ECHO WITHIN 10 MI SE OF THE ACCIDENT SITE. MODERATE TO SEVERE CONVECTIVE TURBULENCE & UP & DOWN DRAFTS WOULD HAVE BEEN PRESENT BELOW 10,000 FT. THE PLT'S LIVER TISSUE PRODUCED 96 MG% ETHYL ALCOHOL & MIXED TISSE FLUID PRODUCED 112 MG%.

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

WEATHER EVALUATION..INADEQUATE..PILOT IN COMMAND

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

DESIGN STRESS LIMITS OF AIRCRAFT..EXCEEDED..PILOT IN COMMAND

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

AIRSPEED(VMO)..EXCEEDED..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:

SPATIAL DISORIENTATION..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..TURBULENCE(THUNDERSTORMS)


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

OVERCONFIDENCE IN PERSONAL ABILITY..PILOT IN COMMAND


Contributing Factors

IMPAIRMENT(ALCOHOL)..PILOT IN COMMAND


Contributing Factors

VACUUM SYSTEM..INOPERATIVE


Contributing Factors

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






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