11.11 Hydraulics Flashcards
What is the disadvantage of synthetic oil in a hydraulic system?
Hygroscopic
Why is it necessary to pressurise hydraulic reservoirs?
- Positive head of pressure
- Prevents evaporation
- Prevents foaming
- Prevents cavitation
Consider a reservoir, what is provided to account for accelerations and altitude?
Baffle plates
Where during maintenance can hydraulic oil be drained from?
Bottom of reservoir
Where could you get level indications for the system?
- At reservoir
- CAS
If the system is running at maximum demand, what would be the position of the wobble plate?
Maximum stroke
What is the purpose of the booster pump impeller of a hydraulic pump?
Positive pressure to prevent cavitation of pump
Where would indication of pump wear be found?
Case drain filter
What causes the RAT to deploy?
Pilot selection, then spring loading
What system in the pump carries away the cooling flow of the pump?
case drain system
If there is a larger demand of a system, what would occur?
PTU will back up by cross demanding
What is the function of a hydraulic accumulator?
To damp fluctuations in the system
What types of load does a static seal withstand?
Steady or pulsating loads
What prevents cavitation of the main system pumps?
Pressurisation of the reservoir
What material is normally used to manufacture low pressure tubing?
Aluminium
