The hydraulic jack of a certain aircraft model is suitable for supporting and lifting the aircraft when the aircraft is conducting leveling, landing gear retraction and extension test, wheel replacement, target calibration, etc.
The hydraulic jack of a certain aircraft model is suitable for supporting and lifting the aircraft when the aircraft is conducting leveling, landing gear retraction and extension test, wheel replacement, target calibration, etc. It is an indispensable and important tool in aviation maintenance and ground support.
1.Hydraulic cylinder and piston rod: transmit pressure through hydraulic oil to generate strong lifting force
2.Hydraulic pump (manual): provide pressure to press the hydraulic oil into the cylinder
3.Control valve: single oil circuit jack, control the lifting and lowering of the piston rod
4.Safety helmet: prevent accidental descent and ensure stability after lifting
5.Wheel system components: with walking wheels, flexible traction and towing deployment
Based on Pascal's principle, the pressure is transmitted through a closed hydraulic system, and a small-area piston drives a large-area piston to achieve low input force conversion into high output force. During operation, the hydraulic pump pressurizes the piston rod to extend and lift the aircraft; when the pressure is released, the hydraulic oil flows back and the jack slowly descends.
Pre-check: Confirm that the jack has no leakage and the hydraulic oil is sufficient
Positioning: Aim at the structural support point of the aircraft fuselage or wing (refer to the maintenance manual of the model for details)
Lifting: Slowly pressurize, multiple jacks need to be controlled synchronously
Locking: After lifting to the working position, lock the safety helmet to prevent accidental descent (do not rely solely on the hydraulic system)
Return: Loosen the stop valve, the jack gradually releases pressure, and the piston rod slowly descends
Precautions: Do not overload or eccentrically load to prevent structural deformation
Regular inspection: Seal replacement cycle (500 hours), regular inspection of hydraulic oil cleanliness
Calibration: Pressure and height accuracy calibration once a year
Storage: Retract the piston rod, apply anti-rust oil, and avoid humid environment
