Everybody (not related to aviation) thinks that That would be a disaster if any failure for all engines. It has never happened so far. An event like that is exceedingly unlikely (to the point of impossible) to happen. And even if it did, the pilot is more than likely to land the plane safely. The main point is, the plane doesn’t suddenly become a stone aerodynamic surfaces are On to keep the airplane safe and secure for gliding; it continues to fly and a pilot can safely land it. Here are the more details on how to work..
With a typical load (fuel/passengers/cargo), at a typical cruising altitude of 35k feet, if A-380 somehow lost power to all four engines, it could glide to a distance of around 110 miles (175 km), which would, under optimal gliding airspeed, take some 30 minutes.
Obviously, the gliding distance will be reduced if the starting altitude was lower.
Airbus A-380 has a slightly better glide ratio than B-747–400.
Also, if the total weight is lower (fewer passengers / less cargo/fuel), the time becomes longer (but the distance remains the same).
This question has been asked (and answered) numerous times on Quora.
It s a well-known fact that gliding distance is NOT affected by any change in the weight of the aircraft (since the aerodynamic properties of the aircraft remain the same). The glide ratio is the same (distance traveled versus altitude lost), so the gliding distance remains the same, but because the airspeed for that ideal glide ratio is different (Check AFM for the best glide ratio), so will the gliding time be different, depending on the total weight.
As a quick notification, The gliding distance is not affected by weight, not by time. A fully-loaded A380 will glide the same distance as an empty A380. However, the heavier airplane will glide at a higher airspeed and reach the ground sooner.
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