In the aerospace industry, the pilot helps to control landing gear, jumpers, vertical ramps and lifts. Airports also use hydraulic systems in a variety of lifts.
And it is interesting that to test that they know that the fuselage is not perforated, they put air pressure between the fuselage walls.
Aircraft tests include:
1- Wheel wind test which is 300 bar pressure
2- Testing all aircraft hydraulic system
3- Aircraft fuselage test
4- Mull device for hydraulic testing of F14 aircraft