47 - IGGS (Inert Gas Generation System)

Question 1

What are the 2x main subsystems of the FTIS (Fuel Tank Inerting System)?

Answer 1

CSAS (conditioned Service Air System)
IGGS (Inert Gas Generation System)

Question 2

Explain the basic principles of the ASM (Air Seperation Module)

Answer 2

Air is stripped of Oxygen, the OEA (Oxygen Enriched Air) is sent overboard, and the NEA (Nitrogen Enriched Air) is sent to the centre tank

Question 3

Where does the air supply for the FTIS come from?

Answer 3

Eng 1 bleed (Primary)
Eng 2 (Secondary)

Question 4

What happens if the oxygen sensor senses an oxygen rate higher than 12%,

Answer 4

the ICU (IGGS Controller Unit) de-energizes the IGGS Isolation Gate Valve solenoid and the DFSOV (dual Flow Shut Off Valve.

(Basically valves either side of the ASM close, isolating the system.)

Question 5

What are the 3 operating modes of the DFSOV (Dual Flow Shut OFF Valve)?

Answer 5

low/mid/high depending on flt phase.