Hi Juud,
From the 777 FCOM 2:
When one or both RECIR FANS switches are OFF, the packs operate at full flow, the cabin air exchange rate is increased, and fuel consumption increases 0.7% for each fan switch OFF.
So there is an option to increase airflow.
There are several reasons not to do this (and perhaps causing irritation towards the asking party?)
- Fuel flow increases quite a bit
- Several investigations have shown that air quality in the 777 is not any different from other airplanes and cannot cause fainting
- in an ETOPS aircraft with only 2 packs you might not want to put them in unnecessary high flow mode with the accompanying higher stresses involved.
- generally speaking in present day hightech aircraft is not a good idea to use selfinvented procedures. There might be other consequences that are not mentioned in the FCOM. As pilots we only know very little about system behaviour outside of recommended procedures. Best to stay away from fiddling with the systems ouside the SOP's when not necessary to overcome bad situations........
Hope this helps. Would love to fly again with you one of these days......
See you around.