PPRuNe Forums - View Single Post - JetBlue off runway on Christmas in Boston
Old 30th Dec 2017, 13:53
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Centaurus
 
Join Date: Jun 2000
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To correct back to the centreline, release the brakes and reduce reverse thrust to reverse idle.
Adding to my own previous post. You have to plan which method of releasing autobrakes is applicable. Using extra brake pedal pressure to release them actually applies the brakes (however momentary that is) and may exacerbate the problem. Switching the autobrake off by its actuating switch may be better. That requires good crew cooperation and prior briefing. Also, reducing to reverse idle is not as simple as it sounds. Some aircraft (and their simulators) have a recognizable reverse detent, while others have hard to locate detents.

Obviously if the aircraft is broadsiding sideways in the crosswind, the action to obtain reverse idle must be swift and sure. Too far down towards reverse idle and before you know it you have missed the detent and gone to forward thrust either on both engines (if a twin) or asymmetric reverse thrust which makes matters worse.

With the time it takes for the N1 to reduce from full reverse to idle reverse taking several seconds, missing the reverse detent and into forward thrust could leave you with significant undesirable forward thrust just when you don't want it.

This is where practicing the manoeuvre in the simulator is invaluable because it takes several attempts to get the procedure right. It depends on the fidelity of the simulator of course and that means experimenting to obtain the required crosswind component and slippery surface conditions that start to get the aircraft (simulator) sliding sideways.
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