ATPL: Cabin air for CS 25 aeroplanes is usually taken from:
Domanda 314, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| The High Pressure Compressor. |
| The high pressure compressor and from the low pressure compressor if necessary. |
| The low pressure compressor. |
| The Second Fan Stage. |
