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As the aircraft soared to approximately 1,000 feet, the first officer raised the flaps to 15 degrees, believing he was following the captain's instructions. However, unbeknownst to him, the captain had anticipated lowering them to 5 degrees instead, leading to a critical disconnect.
The captain, who was already fixating on the aircraft's accelerating airspeed and possible overspeed condition, failed to recognize the aircraft's true flap configuration. A pivotal miscommunication ensued, creating a dangerous scenario where the captain's perception of the aircraft’s configuration diverged from reality.