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Captain Survives Crashing Into Mountain / Air China Flight 129 Crashes on Approach

Black Box Down

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The Ground Proximity Warning System on This Airplane

The ground proximity warning system installed on this aircraft was designed to generate the basic warning from five modes. The two important ones relatid to this incident are mode two, which is excessive closure rate, and mode for unsafe terran clearance. There was only one copy of the jepson manual provided to the crew. So it would not have been easy for the two crew members to cross check the chart.

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