B757 Hydraulics tricks
Looking closer at the QRH:
-It does NOT say "Do not arm speedbrakes" when R&C Hyd Failure.Logical,since normal gear extension.
But still 2 things that do not match:
-Hyd L&C Failure:
It says "Do not arm Speedbrakes" and it says "manually extend speedbrakes after landing".Ok,both messages go together.
But is it assuming that PTU will not work?
Later it talks about Alternate Gear and Flaps "if required"(if PTU not working).But then the " do not arm speedbrakes" should be onli "if required",so if PTU does not work.
What I mean is that the Normal Gear operation and the autspeedbrake funcion should be together,and the QHR puts "do not arm speedbrakes" in the all procedure and the Alt Gear only if required.
If PTU works,we should be able to Arm speedbrakes normally right?
-Hyd L&R Failure:
Totally agree with "Do not arm speedbrakes" in this case.
But then why the "Manually extend speedbrakes after landing" message is missing?
Thank you