11.11 - Hydraulic Power Flashcards
How is the accidental deployment of the RAT prevented on the ground
Inserting a mechanical safety device
What is a Hydraulic demand pump
A unit that operates when hydraulic demand is greater than the main system pressurisation can cope with
Where can fixed displacement hydraulic pumps be found
On hydraulic service panels and to open the doors
How is it possible to depressurise a hydraulic reservoir for maintenance
Operating a depressurisation valve on the reservoir
Some of the hydraulic fluid from the pump is used for cooling and lubrication of the pump its self. Where does it go afterwards
It goes to the case drain
Which of the following components of a multi plunger pump does not rotate when the pump is running
The wobble plate/yoke
Why are hydraulic reservoirs pressurised
To prevent cavitation of the main system pumps
What are the backup rings in the hydraulic components made of
Teflon or nylon
How does the reservoir ensure a constant fluid supply at different flight altitudes and acceleration
By using sheet metal as baffles
How is the output of a variable displacement pump varied
By changing the stroke of the piston
Why is the RAT switch guarded
To prevent accidental deployment
Where is each reservoir of the aircraft hydraulic system replenished from
From one service panel
Define hydraulic force
Hydraulic force is equal to hydraulic pressure multiplied by the area that the force acts upon
Why is a priority valve fitted in the hydraulic system
To give priority in case of the malfunction of two parallel working pumps
Where can fixed displacement hydraulic pumps be found on an aircraft
From the service panel
