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After several hours of flying, the descent commenced, and the aircraft aligned for its final approach to Heathrow. The auto throttles controlled engine thrust, maintaining the necessary speed for landing. However, confusion ensued when the engines failed to respond as expected. Both engines, in a crucial final stage of the landing sequence, unexpectedly failed to generate the required thrust, resulting in a perilous situation just 600 feet above the ground.
The first officer attempted to regain control, but the thrust levels remained unresponsive. With the airplane losing altitude and speed, the crew faced a life-threatening emergency, realizing they were now miles from the runway with impending terrain below them.