NTSB Identification: NYC91FA239.
The docket is stored on NTSB microfiche number 46651.
Scheduled 14 CFR operation of CANAIR CARGO LTD
Accident occurred Wednesday, September 18, 1991 in BELVEDERE CTR, VT
Probable Cause Approval Date: 03/31/1993
Aircraft: CONVAIR CV-580, registration: CFICA
Injuries: 2 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 AIRPLANE WAS CRUISING IN NIGHT INSTRUMENT METEOROLOGICAL CONDITIONS WHEN IT ENTERED A LEFT TURN AND EXCEEDED THE DESIGN AIRFRAME LIMITS. THE AIRPLANE BROKE UP IN THE DESCENT DUE TO AERODYNAMIC FORCES AND WAS DESTROYED.. THE OUTBOARD WING PANELS HAD FAILED DOWNWARD AND CENTER WING SECTION SEPARATED FROM THE FUSELAGE. THE HORIZONTAL STABILIZER AND ELEVATORS HAD FAILED DOWN AND AFT. THE CAPTAIN WAS FOUND OUT OF THE COCKPIT WITH NO EVIDENCE OF HIM BEING IN THE SEAT AT IMPACT A HUMAN FACTORS STUDY FOUND THE AIRCRAFT'S LAST MINUTE OF FLIGHT MATCHED A PROFILE OF A PILOT EXPERIENCING SPATIAL DISORIENTATION.

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

FAILURE OF THE FIRST OFFICER (CO-PILOT) TO MAINTAIN CONTROL OF THE AIRCRAFT AFTER BECOMING SPATIALLY DISORIENTED, AND HIS EXCEEDING THE DESIGN STRESS LIMITS OF THE AIRCRAFT. FACTORS RELATED TO THE ACCIDENT WERE: THE LACK OF TWO PILOTS IN THE COCKPIT, DARKNESS, AND INSTRUMENT METEOROLOGICAL CONDITIONS (IMC) AT FLIGHT ALTITUDE.

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