Turbine Fuel Systems Flashcards
How many electric low pressure pumps per turbine fuel tank?
2
Whats the middle wing fuel tank called?
Outer tank
What valve allows for fuel to be moved from tank to tank?
Cross feed.
A blank controller maintains the correct weight fuel to air ratio as altitude increases in a turbine engine system.
Barometric.
LP booster pumps opporate at a pressure. The centre pump operates at x psi
50
LP booster pumps opporate at a pressure. The feeder pump operates at x psi
30psi
Why is the centre tank pumps at a higher pressure?
To prioritise fuel use from the centre tank first.
When will centre tanks not work? When blank is activated.
When weight on wheels is activated.
Are fuel booster pumps AC or DC?
AC
Why do we use a squirrel cage rotor?
It doesn’t have an electrical supply so carnet form a spark
The left inner fuel tank has un extra pump why?
To supply APU
Assuming cross feed value is open and all pumps are running which pumps are running the APU?
Th central pump.
Which fuel tank has an outward and inward valve?
Surge/vent (vent valve)
What is a spar/fire valve?
Shut off valve for engines.
What happens to thrust if a fuel pump fails?
It decreases.
The jettison system should reach the maximum landing mass in x minutes
15 mins,
When using magnetic-measuring-type dip sticks, the quantity of fuel in the aircraft is determined by using the measurements… from the blank blank and blank tables in the aircraft documentation.
Dip sticks and data tables
Whilst performing an ordinary flight, the pilots notice a fuel imbalance, with the right wing tank holding more fuel than the left wing tank. The crew manage to confirm that there is no fuel leak causing the imbalance. Which of the following should the crew do to restore the aircraft balance? Open/close the cross-feed valve and shut off the left/right wing tank fuel pump(s).
Open the cross-feed valve and shut off the left wing tank fuel pump(s).
Fuel tanks are fitted with baffles to… blank fuel spanwise flow.
Dampen.
Failure of a capacitive fuel indication system will be indicated by…
Empty
Some aircraft are equipped with fuel tanks for trimming purpose, where are these tanks usually positioned and what are they used for? In the forward/rear part of the aircraft, near the tail and used to regulate CG.
Rear
Jet A has a flash point of + X8°C, and Jet B has a freezing point of - X0°C.
Jet A has a flash point of +38°C, and Jet B has a freezing point of -60°C.
On most transport aeroplanes, the low pressure pumps of the fuel system are… hydraulically/electrically driven blank pumps.
electrically driven centrifugal pumps.
Determine the main functions of the fuel system. Provision of fuel to the engines, appropriate blank to enable engine operation
Pressure
Which type of electric power supplies the low pressure pumps of the fuel system on most transport jet aeroplanes? 28/115 V AC/DC
115 V AC
Fuel pumps submerged in the fuel tanks of a large aeroplane are…blank high/low pressure type pumps.
centrifugal low pressure type pumps.
The HP fuel pump is usually located between the Low-pressure fuel blank and the fuel control unit.
Filter
What kind of fuel is wide-cut fuel, and has good cold air properties?
Jet B
Jet A-1 has a freezing point of -4X°C, and a flash point of +3X°C.
47 - 38
Consider a turbine engine aeroplane, with two underwing engines, fitted with two wing tanks and one centre tank. If all centre tank fuel booster pumps fail…Part or all of the fuel in the centre tank is considered blank.
Part or all of the fuel in the centre tank is considered unusable.
Why are additives added to Jet A fuel?
To prevent the fuel from forming any ice within
What is the density of JET-A1?
0.8
What is the purpose of a feed box in the fuel tank? It increases the fuel level at the blank blank location.
It increases the fuel level at the boost pump location.
The main purpose of the DC fuel pump in the left main tank is to… supply fuel to the blank.
APU
The APU can receive fuel from the right/left/all/centre tank.
All
One of the purposes of the fuel system booster pumps being submerged in fuel is to…
Cool the pumps.
The engine fuel control unit (FCU) is protected from damage by debris by…the fine filter located between the high-pressure/low-pressure fuel pump and the blank unit.
High and governor
Which of the following statements is/are correct?
- The freezing point for Jet A is at a higher temperature than that for Jet B
- The flash point for Jet A is at a higher temperature than that for Jet B
Both correct
