Distributed pneumatic supply system of an aircraft

An air system for an aircraft, comprising:

• a plurality of air consumers including at least one air conditioning pack intended to supply an aircraft cabin with air at controlled temperature and pressure,
• a plurality of air sources including at least one air bleed device on a propulsion engine of the aircraft and at least one auxiliary power unit,
• a network of ducts and control valves configured to be able, on command from a control unit and/or according to flight conditions, to provide a fluid connection between said air sources and said air consumers, wherein
• said network of ducts and associated valves comprises at least one valve, called an isolation valve, arranged between an air bleed device and an air duct connecting an air conditioning pack and said auxiliary power unit,
• said control unit is configured to be able to determine, from the air requirements of each air consumer and the available air sources, a configuration of the control valves, called the ideal configuration, that makes it possible to supply each air consumer with air according to the identified requirements, and a configuration, called the degraded configuration, that makes it possible to supply air to predetermined air consumers from said available air sources when said ideal configuration is not attainable.