B 777 door curiosity
question:1
Above 80 Kt the doors are mechanicaly locked. Is the door handle that is locked or the door frame is?
question 2
In case of loss of the air data compiuters who tells the doors such speed value?
question 3
Why in most of the CX (B777) flight I have traveled recently the 9 volts battery that arm the pneumatic emergency opening system (doors) was not showing its charge by pushing the push button test light?
question 4
In the case of the opening of an "armed" door the pressure equalizing vents would have time to open before the pneumatic emergency opening system would activate?
thanks