Originally Posted by Ghostflyer
Why will a post 100kt reject result in burst nose tyres?
We have no way of knowing just yet whether the below scenario is what actually occurred in this instance, but it may offer an opportunity to see how this
might happen.
Flat tires (tyres) on one side of the aircraft creates an unequal amount of rolling friction between left and right. If no braking is applied, the aircraft will "pull" towards the flat tires. If manual braking is used, the brake pedal pressure to the appropriate side may be modulated to help maintain directional control. If auto braking is selected to RTO, (as is normal for takeoff in aircraft so equipped) initiation of an RTO will result in automatic braking. Auto braking should apply equal pressure to both sides. The flat side will begin to skid, causing the anti-skid system to release brake pressure from that side. Even if the failed side locks up, more of the wheel braking effect is now likely being provided by the "good" side, causing the aircraft to "pull" to that side. A normal pilot reaction would be to use steering input to counter the effect, possibly causing unusually high side loads on the nose tires. Not really too surprising that one or both might fail in these circumstances.
The really good news of course, is that in the
actual instance being discussed in this thread, they were able to keep it on the runway surface and get it stopped safely without anything worse happening. A happy result indeed.
I agree completely with the explanation of how engines may be damaged by FOD ingestion during such an event. It has happened many times.
I would certainly not be looking at this as though some kind of "design flaw" was at play here. Hot brakes and tires have been a factor in similar failures many times. The airplane appears to have performed as designed in that a successful RTO was indeed accomplished. In time, analysis of the FDR data will likely reveal much about the sequence of events. Expect to wait awhile for those results to be published though.
Best regards,
Westhawk