Aviation Investigation Report A98H0003
Theoretical calculations show that if an emergency descent had been started from the optimum starting point at 0114:18, the earliest possible landing time would have been 0127. This landing time would only have been possible if there had been no technical malfunctions or adverse cockpit environmental conditions inhibiting the ability of the pilots to navigate and configure the aircraft to obtain its optimum performance capabilities. Any deviation from these "ideal" conditions would result in a later landing time because either the aircraft would require extra manoeuvring off the direct track to the airport, or the aircraft would reach the airport with too much altitude or airspeed to land.
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