Originally Posted by capster
If thats the case , why would the cabin descend on applying takeoff thrust?
You wrote "3000 fpm ROD". In a descending cabin the pressure is rising.
With take off thrust you get more pressure for the packs.
That may equalize a high leakrate.
I donīt have license on the 737-Jurassic, but i think they have also a pre-T/O pressurize.
With engines in idle the controller may not get his wanted 200ft (?) below airportlevel.
At T/O he gets enough air and try to get the 200ft as soon as possible (3000 fpm ROD)