Assuming you're talking about the 744-
There are two sources of bleed air available from each engine:
intermediate pressure (8th-stage) and high pressure (15th-stage). During low power engine operation, the three 15th-stage bleed ports supply compressed air. During high power engine operation, the two 8th-stage bleed ports supply compressed air. The intermediate pressure check valve will not permit high stage air to be supplied to the intermediate bleed ports (it is a one-way valve).
The engine is a high by-pass ratio turbo-fan. It has:
A one-stage LP compressor connected to a three stage turbine.
A seven-stage IP compressor connected to a one stage turbine.
A six-stage HP compressor connected to a one stage turbine.
A combustion system between the compressors and turbines.
The LP, IP and HP systems are mechanically separate from each other.
340 has 7 slats per wing, total 14