In a typical Pratt & Whitney turbofan (e.g., the PW1000G or the legacy JT8D), the engine is divided into five rotating groups:
Axial or centrifugal compressors progressively squeeze the air into a smaller volume, significantly increasing its pressure and temperature. In a typical Pratt & Whitney turbofan (e
: Guidelines for take-off, power selection, altitude selection, and icing prevention. Systems Maintenance the PW1000G or the legacy JT8D)