A320 family - hyd. System pressurization on ground
 

Hello
There’s something in the FCOM that bothered me without being able to find a direct answer .
In the very first pages of the FCOM / SOP , there is a : “WARNING : Do not pressurize the green hydraulic system without clearance from ground personnel, if any gear door is open.”
So far so good , this makes sense . But on the succeeding SOP chapter there are a few instances of other warnings saying : “WARNING Do not pressurize hydraulic systems without clearance from ground crew.”
Notice that now it speaks in general about the hydraulic systems ( not just about the green if gear doors are open ) .
Since in the preliminary cockpit preparation you have verified that aircraft systems using hydraulic pressure are at some fixed position , what consideration would you then have if needing to pressurize a hydraulic system ?

incase the Accu pressure for the brake in not in the green arc, then you'll have to pressurize the system using the yellow hydraulic electric pump. Prior to doing that, you'll have to get clearance from ground.

Hydraulic leaks of fluid cause a risk to personnel in the near vicinity of the aircraft.

From a ground crew perspective:-
Has the aircraft been handed over to the flight crew?
Is any maintenance or servicing being carried out?
Remember Flying Controls will move to neutral position with hydraulics pressurised.
If I am outside doing stuff, I don't want hydraulics or other things being operated without my knowledge.

Flight controls getting into neutral position was the only thing I could think of , but their location was well outside normal ground crew area of operation . Basically in the occasion we wanted to charge the accumulator , and asked permission from ground crew , they did not really know why we were asking their permission. It will probably pertain more to crew doing specialized work around control surfaces , perhaps being up there with ladder