NTSB Identification: DEN92FA076.
The docket is stored on NTSB microfiche number 47344.
Accident occurred Thursday, July 23, 1992 in MANVILLE, WY
Probable Cause Approval Date: 06/11/1993
Aircraft: AERO COMMANDER 560-F, registration: N560CM
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.

DURING A CROSS COUNTRY BUSINESS FLIGHT, WHICH WAS FILED AND FLOWN UNDER INSTRUMENT FLIGHT RULES, THE PILOT AND CONTROLLER HAD NUMEROUS COMMUNICATIONS REGARDING ROUTING AND WEATHER, AND THE AIRCRAFT WAS CIRCUMNAVIGATING WEATHER AREAS. THE PILOT REPORTED ENTERING WHAT HIS STORMSCOPE SHOWED AS A 'CLEAR' AREA AFTER ENCOUNTERING RAIN AND MODERATE TURBULENCE AT TEMPERATURES CONDUCIVE TO STRUCTURAL ICING. THE CONTROLLER NOTED A 1,000 FOOT LOSS OF ALTITUDE FROM THE ASSIGNED CRUISE ALTITUDE OF 17,000 FEET, FOLLOWED BY A LOSS OF ALTITUDE READOUT. SHORTLY THEREAFTER THE AIRCRAFT DISAPPEARED FROM THE CONTROLLER'S RADAR SCOPE. THE WRECKAGE WAS FOUND NEAR THE LAST RADAR FIX. THE AIRPLANE IMPACTED IN A NEAR VERTICAL DESCENT.

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

A LOSS OF CONTROL FOLLOWING FLIGHT INTO WEATHER CONDITIONS CONTAINING THUNDERSTORMS, TURBULENCE AND ICING CONDITIONS. FACTORS WERE: INACCURATE WEATHER EVALUATION AND FLIGHT INTO KNOWN ADVERSE WEATHER BY THE PILOT IN COMMAND.

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