virgo, it's a bit more complicated.
GE & CFM engines DO have bleeds (called bypass doors) - and they should open only at low power to dump excess booster (or LP Compressor if you will) air to prevent a booster stall.
But if the doors leak, their discharge goes into the fan duct, ADDING to fan nozzle flow. Thus at a given N1, thrust should be HIGHER than normal.
The catch is that with less core airflow, the LP turbine probably won't be able to spin the fan up to speed without hitting some other control limit.
Last edited by barit1; 16th September 2007 at 01:17.