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Descent on the flight that preceded the flight. that indicates or strongly suggests that this is so important that they put this into the interim report that it appears to them that he did in fact rehearse all this. it's interesting to point out that while the co-pilot changed the selected altitude of the autopilot several times, at no point did that influence the trajectory of the plane. it was supposed to be going down at that point in time. it did. they believe that because trajectory of the plane wasn't changed because the altitude changes were so quick that he readjusted them and that's w...

Autopilot to 100 feet before leveling off again. >> he certainly was exploring the aircraft and its ability to go up or down and not stop him from descending it into the ground making sure nobody would see him. >> reporter: according to the new report the selected altitude decreased to 100 feet for three seconds. then increased to the maximum value of 49,000 feet less than two minutes later, the selected altitude was 100 feet until it stabilized at 25,000 feet. the flight never left its scheduled path so air traffic control didn't notice the altitude changes. >> unless the plane is equipped to...

He didn't notice the plane go down in any way. it wasn't noticeable in terms of altitude changes. i guess my question to you is if someone's in there setting it from 100 feet to 49,000 feet back to 100 feet that doesn't register anywhere? with anybody? >> the plane was already in a cleared descent from about 39,000 feet to 21,000 feet. and so for him to spin the knob below the assigned altitude of 21,000 feet wouldn't change what the plane would do. if he'd gotten to 21,000 feet and hadn't changed it would have kept descending but there wouldn't be wild gyrations based on knob turns. because t...

For three seconds. then increased to the maximum value of 49,000 feet. less than two minutes later, the selected altitude was 100 feet. until it stabilized at 25,000 feet. the flight never left its scheduled path so air traffic control didn't notice the altitude changes. >> unless the plane is equipped to stream the data and they decide to stream the data of the aircraft performance from the flight and someone's monitoring it they wouldn't have noticed. it was clear the pilot didn't notice for another reason. the front lab was inoperative and he apparently went clear to the back. he was gone f...

Stabilized at 25,000 feet. the flight never left its scheduled path so air traffic control didn't notice the altitude changes. >> unless the plane is equipped to stream the data and they decide to stream the data of the aircraft performance from the flight and someone's monitoring it they wouldn't have noticed. and it was clear that the pilot didn't notice for another reason the front lab was inoperative. >> reporter: it appears it was a dry run for what he would do later that same morning on board the very same plane during flight 9525. lubitz waited until the captain left the cockpit, locked...