Date: March 08, 2013
Time: 08:15
Location: Near Dillingham, Alaska
Operator: Ace Air Cargo
Flight #: 51
Route: King Salmon - Dillingham
AC Type: Beechcraft 1900C
Registration: N116AX
cn / ln: UC-17
Aboard: 2   (passengers:0  crew:2)
Fatalities: 2   (passengers:0  crew:2)
Ground: 0
Summary: The cargo plane crashed about 20 miles northeast of Dillingham while on approach to Dillingham Airport. Wreckage was discovered on Saturday with the pilot and copilot fatally injured. The aircraft was badly fragmented in three sections. The flight crew's failure to maintain terrain clearance, which resulted in controlled flight into terrain in instrument meteorological conditions. Contributing to the accident were the flight crew's failure to correctly read back and interpret clearance altitudes issued by the air traffic controller, their failure to adhere to minimum altitudes depicted on the published instrument approach chart, and their failure to adhere to company checklists. Also contributing to the accident were the air traffic controller's issuance of an ambiguous clearance to the flight crew, which resulted in the airplane's premature descent, his failure to address the pilot's incorrect read back of the assigned clearance altitudes, and his failure to monitor the flight and address the altitude violations and issue terrain-based safety alerts.

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