Air conditioning system provides what?

• A. The temperature control and air supply for pressurization
• B. The cooling of avionics only
• C. Power generation for cockpit instruments
• D. Lighting and environmental control only

Answer: (A)

The air conditioning (environmental control) system is responsible for delivering conditioned air and maintaining cabin pressure. It uses bleed air from the engines or APU, runs it through packs to control temperature, and distributes it to the cockpit and cabin. A cabin pressure controller with an outflow valve regulates how much air leaves the cabin, keeping the interior at the desired altitude and pressure. So the system provides temperature control and the air supply necessary for pressurization, rather than generating power or handling lighting, and while it can aid in cooling avionics, its primary role is conditioning air and maintaining pressurization.