ATPL: By-pass turbine engines are mainly used in commercial aviation, because:
Domanda 637, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| Twin Spool Or Triple Spool Jet Engines Require A High By Pass Ratio. |
| At high subsonic airspeeds they have a better propulsive efficiency than propeller or straight jet engines. |
| They are lighter than straight jet engines. |
| They Produce Less Noise. |
