Original sentence: After continuing unsuccessfully to attempt to restart the engines for over 14 minutes, during which period much altitude was lost, they declared to ATC that they had in fact lost both engines.However, those blades and the gears expanded and the metal scraped on each other when the engine overheated.The crew ended the dive when they had reached 230 kt but the blade rotation rate had not climbed above 2% N2
Edited sentence: After continuing unsuccessfully to attempt to restart both the left engine (two times) and the right engine (two times) for over 14 minutes, while utilizing the emergency restart procedure, much altitude was lost.Despite their four auxiliary power unit-assisted engine restart attempts, the pilots.However, the turbine blades expanded contacting the honeycomb labyrinth seals allowing the metal to scrape on each other when the engine overheated with zero core rotation.It was after these unsuccessful attempts that they declared to ATC that they had in fact lost both engines.The captain did not take the necessary steps to ensure that the first officer achieved the 300-knot or greater airspeed required for the windmill engine restart procedure and then did not demonstrate command authority by taking control of the airplane and.The crew ended the descent when they had reached 230 kt but neither engine core (N2) ever indicated any rotated during the entire descent.Without core rotation, recovery from the double engine failure was not possible.accelerating it to at least 300 knots.were unable to restart the engines because their cores had locked