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BlueGreenGrey The guy in the bottom video has no clue what he's talking about. That's why he had to ask his Dad what goes on inside a passenger jet and even then, he got the pilot's duties screwed up in his video presentation.
To your point about the Air India 787 being seen with its flaps up and not down as you say, the flaps are not normally in the 'down' position anyway during takeoff! The flaps are only in the 'down' position during landing! They were not landing! They were taking off!
To that point, if you look at the grainy video being shot by an amateur photographer during the 787's takeoff sequence, you'll notice that the wing flaps are actually in what's called the 'takeoff' setting, which is about 5 degrees of down-flap.
During the landing sequence, the flaps are normally in about the 40 degree down-flap setting. Therefore, during the takeoff, those flaps were in their correct takeoff position.
As the aircraft suddenly started to descend after takeoff, neither engine was developing thrust which means they were not running. The RAT had automatically deployed which can be heard in the video you provided, but the RAT only deploys automatically during a total hydraulic failure or during a total engine failure involving both engines.
The only way that both engines could quit simultaneously would be from the pilot intentionally shutting them off, or fuel starvation to both engines, or simultaneous bird strikes involving both engines. In the latter case involving birds, the engines wouldn't just flame-out... they would actually catch fire as they both incurred catastrophic internal damage from those birds and there'd be a lot of smoke and definitely a long stream of fire trailing from both engines. There was NONE of that which means they didn't have a bird strike.
That leaves only voluntary engine shutdown... or fuel starvation to cause both engines to quit simultaneously, thereby causing the auto-deployment of the RAT.
The fact that a huge fireball can be seen would be consistent with a minimum fuel load onboard that was left over from the previous flight.
The fireball that eventually erupted wasn't consistent in size and magnitude for a 787 fully loaded with fuel however!
In fact, there was very little fire and very little fire damage on the ground to surrounding property which got extinguished with water, not foam! ... which further tells us that there wasn't a lot of fuel onboard.
