11.10 Fuel And 11.11 Hyds

Question 1

What would a milky appearance in a fuel sample indicate

Answer 1

Water

Question 2

The lowest temperature that an ignitable vapour is given off fuel is known as

Answer 2

Flash point

Question 3

A fuel tank that is a part of the structure is known as what

Answer 3

Integral

Question 4

What component ensures the booster remains wet

Answer 4

Flap/collector valves inside the collector tank

Question 5

Ribs act as what inside the wing structure

Answer 5

Structural integrity for the wing and a baffle for the fuel

Question 6

Now does a NACA duct work

Answer 6

Ram air is converted to pressure for pressurisation

Question 7

What prevents the fuel entering the vent system

Answer 7

Float valves

Question 8

What is the normal sequence of fuel usage on an aircraft

Answer 8

Centre, inboard, outboard tanks, both together

Question 9

What is the maximum refuelling pressure

Answer 9

50psi

Question 10

In what part of the fuel system is the jet pump and when will it operate

Answer 10

Water scavenge and fuel scav system will run when boost pumps are running

Question 11

What 3 fuel sensors are there

Answer 11

• Capacitance
• resistance (thermistor)
• magnetism (reed switch)

Question 12

How is fuel prevented from vaporising during fuel jettison

Answer 12

Anti corona nozzle

Question 13

If a fuel pump fails how would fuel be provided to the engines

Answer 13

Pump bypass and feed by suction or gravity

Question 14

Which tanks on a commercial aircraft are not capable of gravity refuelling

Answer 14

Centre and stab tanks

Question 15

How is water removed during normal operation of the fuel system

Answer 15

By using booster pump supplied jet pumps to scavenge the water

Question 16

In what position is the cross feed valve during normal operation

Answer 16

Closed

Question 17

What is a disadvantage of synthetic oil in a hydraulic system

Answer 17

It’s hydroscopic

Question 18

Why is it necessary to pressurise the hyd reservoirs

Answer 18

To compress any air in the system and prevent cavitation

Question 19

What is provided to account for accelerations and altitude in a reservoir

Answer 19

Baffle plates made of sheet metal

Question 20

Where, during maintenance can hyd fluid be drained

Answer 20

The bottom of the reservoir

Question 21

Where would you get hyd indications from

Answer 21

ECAM and hyd reservoir

Question 22

What is the purpose of the booster pump impeller of a hydraulic pump

Answer 22

Make sure the pump is fed by providing positive pressure

Question 23

Where would you find evidence of pump wear

Answer 23

Hyd filters

Question 24

What causes the RAT to deploy

Answer 24

Manual pressing of a graded switch

Question 25

What system in the pump carries away the cooling flow of the pump

Answer 25

Case drain

Question 26

If there is a larger demand on a hydraulic system what would occur

Answer 26

Either PTU or priority valve would kick in

Question 27

What type of loads does a static seal withstand

Answer 27

Steady or pulsating loads

Question 28

What prevents cavitation of the main hyd pumps

Answer 28

Header pressure of the reservoir of 50psi or impeller

Question 29

What material is normally used to manufacture low pressure tubing

Answer 29

Aluminium