Autonomous air conditioning system for aircraft

An aircraft comprising:

• a primary compressor compressing air bled from outside the aircraft and supplying compressed air, a first portion of said compressed air being injected into a cabin of the aircraft so as to condition cabin air in terms of pressure and of temperature,
• a first electric motor supplying mechanical energy to the primary compressor,
• a fuel cells stack supplied with air by a second portion of the compressed air supplied by the primary compressor, the fuel cells stack supplying electrical energy to power the first electric motor, and
• a switch configured to electrically connect to the fuel cells stack, and to do so alternatively, a first electrical assembly and a second electrical assembly, the first electrical assembly being configured to supply electrical power to the system, the second electrical assembly being configured to supply electrical energy to equipment external to the system and providing safety functions in the aircraft;
• wherein the switch is controlled by a control unit and the control unit is configured to upon detection of an emergency situation corresponding to the reception of an alarm, transmit a switching instruction to the switch to stop the power supply to an autonomous system and to power a priority electrical loads, and upon detection of the end of an emergency situation, transmit a switching instruction to the switch to stop the power supply to the priority electrical loads and to power the autonomous system.