Originally Posted by
NSEU
Oh... thanks... It's no wonder I couldn't find/see it. Perhaps just an emergency backup for the NGS?
Cheers!
No, the 787 has a classic vent system. The NGS just pumps nitrogen enriched air into the ullage, the tank is still repressurized in descent via the vent system (this is the sizing case for the NGS). The NGS is on the MMEL.