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ahinterl

Braking and reverse thrust

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This interesting Smartcockpit article reminded me of the true autobrake function.The target of the autobrake is a deceleration value, not an amount of force applied to the brakes. Pay attention to the fact that reverse thrust doesn't normally add to deceleration. The autobrakes are modulated accordingly to take reverse thrust deceleration into account and "lighten" the brake forces accordingly.So, on one graph, you can see that braking without and with reverse thrust has exactly the same effect on deceleration.Maybe brake wear were excessive if brakes were used alone, so I guess reverse thrust is there to "leverage" the brakes and reduce overall costs. And in slippery situations, reverse thrust may probably yield better results than "floating" wheels with poor ground contact...Andreas

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