B777 central hydraulic system
I am puzzled about the C Hydraulic system.
In case of HYD QTY LOW R+C the QRH suggests that a leak in the brake system might be the reason.
For any problem in the C system we usually keep the C1 ACMP running as it is dedicated to the reserve system. This is of course useless when the leak is in the brake system so you switch it off.
The question is. How do you drop the MLG and Nose gear? The MLG drops by gravity but you must first unlock the uplock to do that.The alternate gear extension uses C HYD and a separate DC pump but how does it work if there is no more HYD QTY? In case of QTY loss in C+R the C reservoir will empty all to the bottom.