What would cause a pilot of a big commercial airplane such as the 747 or the A380 to abort a takeoff?
by 
kuyakev
ANSWERS: 5
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A sudden hail storm at the airport would.
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Basically anything unexpected happening before it reaches the speed known as V1. An engine dirge, an engine not delivering delivering full power, a tyre burst, any one of thousands of warnings occurring. If anything goes wrong, safe on the ground is the place to be. Any commercial pilot will abort a take-off if anything at all strange happens before V1. But once V1 has been reached, the aircraft is committed to take-off (it cannot stop safely before the end of the runway), so it has become airbourne and go round if necessary.
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Takeoff proceedures usually commence as following: Pilot doing the rotation/flying looks out the window and watches the runway. The second pilot monitors the speed and will give the V1 callout. That in mind, if either one of the two sees something that would cause a problem the takeoff is aborted. Many abort calls come from the tower revoking takeoff clearance before V1. Other possible causes include unusual engine behavior (overheating, failure to maintain thrust) Some rare situations could include a failure indication in any one of the mandatory systems needed for flight. Note: Sometimes pilots opt to fly even with a malfunctioning system. However there is a strict guideline for each aircraft governing what requirements must be met for flight. For instance, last week I opted to take off with a failure indicator for the backup smoke detection loop for the rear cargo compartment on.
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It could be a number of things engine failier,flames shooting out the back of the plane,another co pilot thinking that the pilot is not in good shape. Any type of bad weather,or many other things.
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Basically, prior to 80 knots you abort for any warning or abnormality. After 80 knots, up to V1, you abort for engine failure, fire, or predictive windshear. All other warnings are inhibited. You don't abort after V1 unless you consider that the aircraft won't fly, and the crash you're going to have from the abort will be less than the crash you'd have if you continued.
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