ATPL: For a fan jet engine, the by-pass ratio is the:
Domanda 220, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| Internal Airflow Mass Divided By The Fuel Flow Mass |
| Internal airflow mass divided by the external airflow mass |
| Fuel flow mass divided by the internal airflow mass |
| External airflow mass divided by the internal airflow mass |
