Onboard Inert Gas Generating System

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Onboard Inert Gas Generating System For a 747SP
Feb. 2002
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System Requirements
1) Inert center tank to 12 O2 at the gate in
90 minutes without the use of bleed air. 2)
Inert center tank to 12 O2 at the gate in 45
minutes using bleed air. 3) Have and optional
design for inerting the center tank to 12 O2
at the gate in 45 minutes without the use of
bleed air. 4) Inert either forward or aft cargo
compartment inflight, on demand, to 12 O2 in
30 minutes.
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System Components Production Costs
Item Description Cost Weight 1
2 Inlet door screen for 60K 30 Lb. cooling
air. Plus all system ducting. 3
Bleed air shut off valve 4.3K 4 Lb. 4
Compressor 10K 20 Lb. 5 6
Heat exchanger Fan 15.2K 22 Lb. 7
Filter 1K 1.5 Lb. 9
Heater .1K 0.1 Lb.
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System Components Production Costs
Item Description Cost Weight 6
10 Temp. Regulating valve 5K 3.1
Lb. controller sensors 11 Shut off valves
1 (2) 5K 5 Lb. 12A B ASMs shell
(6) 66K 120 Lb. 15 Shut off valves 2
(2) 6K 5 Lb. 17,18,19,20 Various check valves
(10) 14K 8.2 Lb. 21
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System Components Production Costs
Item Description Cost Weight Moun
ting Pallet 11K 13 Lb. Non Recurring design
per Model 110K STC Application per
Model 150K
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System Components Production Costs
System cost first of Model 460K Each aircraft
after 200K Total weight 231.9 Lb.
Cost weight does not include tank distribution
or vent system modifications.
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