AGK Systems - Fuel Systems

Question 1

Cross Feeding

Answer 1

Open Cross feed valve

Turn off the Pump

Once feed is complete

Turn pump back on

Close valve

Question 2

Integral Tank

Answer 2

Interior structure of wing forms boundaries of tank

Question 3

Flexible Tanks

Answer 3

Made from rubberised fabric material

Attached to the structure using chords and buttons

Question 4

Drum Tanks

Answer 4

Rigid tank made from aluminium

Question 5

AVTUR vs AVTAG

Answer 5

AVTUR: Jet A / JetA-1

AVTAG: Jet B

Question 6

Jet A / JetA-1 flashpoint and auto ignition temp

Answer 6

38°C

Auto-igniton temp of 210°C

Question 7

Voltality

Answer 7

Liquid to vapour

Question 8

Collector Box

Answer 8

One way flop tubes / check valves ensure constant supply of fuel even when manoeuvring

Question 9

Why is the APU pump DC powered?

Answer 9

So you can start from the battery

Question 10

What is Venting?

Answer 10

When fuel vapour comes out the vapour vents at the wing tips

e.g. if fuel level is max at night but then the next day the level has decreased. Reason is becusase the fuel expands due to heat and then gets pushed out the vents - decreasing the overall level (fuel is dumped onto the floor)

Question 11

Pump low pressure light reasons

Answer 11

Pump not working

Leak

No fuel

Question 12

Why do we heat fuel?

Answer 12

Prevent fuel waxing

Heated by a Fuel Cooled Oil Cooler (FCOC) or a Fuel Oil Heat Exchanger (FOHE)

Question 13

Capacitance System

Answer 13

Fuel densitometer measures fuel density

System knows density/volume so it can calculate mass

Question 14

Fuel Jettison System

Answer 14

Must discharge 1% of maximum weight per minute and must be complete within 15 minutes (MLM)