PPRuNe Forums - View Single Post - Differential braking with anti-skid active
Old 1st Feb 2020, 19:20
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tcasblue
 
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Originally Posted by FullWings
Oh yes, that we do. But how much formal training (as in hands on in the sim) is given on aircraft handling on icy/slippery runways? Have you ever tried differential braking whilst holding full rudder deflection on your type?.
Virtually none of us have any formal training on this is given in the sim and it is unknown how accurate it would be in any of the variety of sims out there. Which is why I am discussing this. For our knowledge.

Originally Posted by FullWings
All good advice and SOP on many types, however in the situation where you are sliding off the runway at <60kts due wind, it is because the side loading on the airframe exceeds the lateral grip you can generate. As this indicates a *very* low friction surface, I would not hold out for a “huge change” under those circumstances, no matter what you do with the brakes. .
Maybe you wouldn't hold out for a huge change but maybe it will be enough to save the day. Each situation is different. And it is certainly better to NOT make the brake input that actually makes things worse which appears to be not only the instinctive input, but what appears to be the belief by many...of being the correct input.

Originally Posted by FullWings
The real answer is to do everything possible not to expose yourself to these conditions in the first place and thinking you have “this one neat trick that icy runways hate!!!” up your sleeve may encourage riskier behaviour.
This is not the "Real" answer. It is a good preventative measure that is of no use once the situation is encountered. One could say that the real answer to a windshear encounter from a thunderstorm is to not operate near one and therefore, no more escape maneuvers need be in the training and therefore, you "have this one neat trick up your sleeve" called the windshear escape maneuver.



The use of reverse thrust was mentioned a couple of times here but the aircraft in the accident report that I provided a link to, like many jets...has no reverse thrust capability. So perhaps best to focus on the proper differential brake input in terms of brake use to try and salvage a situation.

Last edited by tcasblue; 1st Feb 2020 at 21:55.
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