Originally Posted by Rob21
Autobrake was selected to med, as recommended for slippery runways. Autobraking starts with ground spoiler deployment.
Why not start manual braking also with spoiler deployment?
Why should manual braking depend on ground spoilers? If you planned to depend on ground spoilers, use autobrake.
If you brake with no ground spoilers on a wet runway, the risk of aquaplaning isn't higher?
Higher compared to what?
The risk of aquaplaning isn't higher when braking than when not braking.
The risk of aquaplaning is higher without ground spoilers than with ground spoilers.
It makes more sense to me that only without lift on the wings you can think on stopping fast.
There is nothing gained by delaying braking. If and when ground spoilers deploy, all the better, you will get optimal braking conditions. But until then you can, as we have seen, brake with perhaps 1.2m/s/s, instead of nearly nothing if you don't brake. Every little bit helps.
Bernd