NTSB Identification: DEN81FA068
14 CFR Part 91 General Aviation
Aircraft: CESSNA T210L, registration: N94136

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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3-3615  81/9/25    BIG TIMBER,MT       CESSNA T210L        CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 40, 3700
        TIME - 1830                    N94136              PX-  0  0  0  BUSINESS                  TOTAL HOURS, 500 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BOISE,ID                    BILLINGS,MT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE ACCESSORIES: VACUUM PUMPS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PILOT IN COMMAND - SPATIAL DISORIENTATION
           PILOT IN COMMAND - EXCEEDED DESIGNED STRESS LIMITS OF AIRCRAFT
        FACTOR(S)
           WEATHER - RAIN
           AIRFRAME - WINGS: SPARS
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OVERCAST                                                  1000
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     RAIN
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      41
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          220                                                       14
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          IFR                                                      IFR
        REMARKS- VACUUM PUMP'S FLEXIBLE DRIVESHAFT COUPLING FAILED.

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