B757 Hydraulics tricks
I found answer to:
1-Boeing QRH says"Autobrake INOP" if R Hyd failure.Ok.Nut wy it sys:"DO NOT USE AUTOBRAKE" when L Hyd failure?what do they mean?Because if you only loose L Hyd,you still have R Hyd so you have Normal and Reserve Brakes so we should have full Autobrake capability..
If nosewheel steering is inoperative, then differential braking will be required to keep the aircraft straight on the runway. The autobrake system can only provide straight-line braking and differential braking is not available during autobraking.
But,again:This "Do not use Autobrake" appears on L Hyd faluer and in L&C Hyd Failure.
My question is:in both cases,if PTU works,we would have Nosewheel Steering so we would not need Diff braking and we would be able to use Autobrake right?