CCTV footage accessed and verified by the Associated Press showed Air India flight 171 bound for London taking off and crashing into a medical college in the northwestern city of Ahmedabad on Thursday, killing more than 180 people in one of India's worst airline disasters in decades.
There are minimum airspeeds the aircraft must reach before the flaps can be safely retracted. I don’t know the exact numbers, but assuming a standard flaps 5 takeoff for B787, retraction to flaps 1 would occur around 1000 ft by earliest, that’s typically 20 to 30 seconds after the takeoff.
Also gear should probably be retracted first (though I don’t actually know for certain for this aircraft)
Usually the gear is retracted almost immediately after takeoff, as it creates a huge amount of unnecessary drag if left out when not needed.
Ya that’s true for multiengine in general. I just didn’t know if there was any other sequencing needed for the 787 (like move flaps from 5 to 4) because I know nothing about flying such large planes.