|Title:||Taxiway excursion in icing, Japan Air Lines Co., Ltd., Boeing 747-246, JA8122, Anchorage, Alaska December 16, 1975|
|Micro summary:||This Boeing 747-246 slid off a taxiway in icing conditions.|
|Event Time:||1975-12-16 at 2055 AST|
|Publishing Agency:||National Transportation Safety Board (NTSB)|
|Site of event:||Taxiing; Anchorage|
|Departure:||Anchorage International Airport, Anchorage, Alaska, USA|
|Destination:||Tokyo International Airport (Haneda), Tokyo, Japan|
|Airplane Type(s):||Boeing 747-246|
|Type of flight:||Revenue|
|Executive Summary:||About 2055 Alaska standard time, December 16, 1975, Japan Air Lines Co., Ltd., Flight 422, slid off the north side of the east-west taxiway of Anchorage International Airport while taxiing out for a takeoff on runway 6R. The aircraft weathercocked about 70° to the left and slid backward down a snow-covered embankment with an average slope of -13°. The aircraft came to rest on a heading of 150° on a service road approximately 250 feet from, and 50 feet below, the taxiway surface.|
Of the 121 persons on board, 2 were injured seriously. The aircraft was damaged substantially by impact; there was no fire.
The National Transportation Safety Board determines that the probable cause of this accident was the loss of directional control during taxi as a result of ice on the taxiway and strong, direct crosswinds.
Contributing to the accident were (1) the captain's decision to take off from runway 6R after receiving reports that taxiing conditions were deteriorating, and (2) failure of airport management to anticipate predictable unsafe icing conditions on the airport. This failure to anticipate these conditions resulted in delayed and insufficient preventive action.
|Learning Keywords:||Operations - Slippery Runway, Taxiway, Apron|
|Operations - Upset - Uncommanded or excessive Yaw|
|Other - Airport Management|
|Close match:||Runway Departure Following Landing, American Airlines Flight 102, McDonnell Douglas DC-10-30, N139AA, Dallas/Fort Worth International Airport, Texas, April 14, 1993|
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