Fuel Components

Question 1

What is a cell interconnect breakaway valve

Answer 1

FWd and aft cells are interconnected by 4 breakaway valves

Breakaway shut off valves shut off to prevent fuel loss in event of damage to aircraft structure

Question 2

What is a in line breakaway valve

Answer 2

Aft face of fuel cells

Breakaway shut off valves shut off to prevent fuel loss in event of damage to aircraft structure

Question 3

What is a swing check valve and where is it used

Answer 3

Solenoid operated via precheck panel

Aloes fuel flow in one direction to either main or six tanks during refuelling

Question 4

What is a fuel/defuel shutoff valve

Answer 4

Automatically stop flow to the tanks when tank are full

Question 5

What is a vent valve and where is it used

Answer 5

Fwd section of fuel cell used to provide venting during refueling

Question 6

What is a dual pilot valve

Answer 6

Valves mounted at the full tank level equiped with floats. Float rises when tank is full and shuts off valve.

Enclosed in box and baffle to prevent actuation vis sloshing fuel

Question 7

What is a fuel precheck panel

Answer 7

Located behind access panel slows to to see a fuel state

Question 8

Describe the operation for pressure refueling

Answer 8

Primary and secondary’s to operate a solenoid of the dual pilot valve

When the solenoid actuates it blocks the vent hole simulating a full tank

The fuel/defuel shutoff valve closes stoping flow to the tank

The solenoid is reenergised and trapped fuel drains into the tank

Fuel enters the dual pilot valves via float valves,
When the fuel lifts the floats causing the float valve to close.

Back pressure is created and the fuel/defuel shutoff valve closes stopping flow