11.10 Fuel And 11.11 Hyds Flashcards
What would a milky appearance in a fuel sample indicate
Water
The lowest temperature that an ignitable vapour is given off fuel is known as
Flash point
A fuel tank that is a part of the structure is known as what
Integral
What component ensures the booster remains wet
Flap/collector valves inside the collector tank
Ribs act as what inside the wing structure
Structural integrity for the wing and a baffle for the fuel
Now does a NACA duct work
Ram air is converted to pressure for pressurisation
What prevents the fuel entering the vent system
Float valves
What is the normal sequence of fuel usage on an aircraft
Centre, inboard, outboard tanks, both together
What is the maximum refuelling pressure
50psi
In what part of the fuel system is the jet pump and when will it operate
Water scavenge and fuel scav system will run when boost pumps are running
What 3 fuel sensors are there
- Capacitance
- resistance (thermistor)
- magnetism (reed switch)
How is fuel prevented from vaporising during fuel jettison
Anti corona nozzle
If a fuel pump fails how would fuel be provided to the engines
Pump bypass and feed by suction or gravity
Which tanks on a commercial aircraft are not capable of gravity refuelling
Centre and stab tanks
How is water removed during normal operation of the fuel system
By using booster pump supplied jet pumps to scavenge the water
In what position is the cross feed valve during normal operation
Closed
What is a disadvantage of synthetic oil in a hydraulic system
It’s hydroscopic
Why is it necessary to pressurise the hyd reservoirs
To compress any air in the system and prevent cavitation
What is provided to account for accelerations and altitude in a reservoir
Baffle plates made of sheet metal
Where, during maintenance can hyd fluid be drained
The bottom of the reservoir
Where would you get hyd indications from
ECAM and hyd reservoir
What is the purpose of the booster pump impeller of a hydraulic pump
Make sure the pump is fed by providing positive pressure
Where would you find evidence of pump wear
Hyd filters
What causes the RAT to deploy
Manual pressing of a graded switch
What system in the pump carries away the cooling flow of the pump
Case drain
If there is a larger demand on a hydraulic system what would occur
Either PTU or priority valve would kick in
What type of loads does a static seal withstand
Steady or pulsating loads
What prevents cavitation of the main hyd pumps
Header pressure of the reservoir of 50psi or impeller
What material is normally used to manufacture low pressure tubing
Aluminium
