A Turkish A321 airliner was hit by an Asiana A330 on 13 May 2018 at Istanbul Airport. It seems a large amount of fluid was released from the damaged section. What is the fluid? There is no APU up there so only hydraulic fluid, am I right?
It is hydraulic fluid. This works on 3000psi so that would explain the geyser.
I am not familiar with the A320 family but on most aircraft hydraulic system there are usually isolation valves to ensure that part of the system remains serviceable if there is a sudden loss of pressure/fluid in one part of the system.