In the IGN START position, the FADEC is powered, the ECAM engine page displays, and ______________.

In the IGN START position, the FADEC is powered, the ECAM engine page displays, and ______________.

• A. The pack valves automatically close
• B. The engine starts automatically
• C. Fuel pumps enable
• D. A20PU is activated

Answer: (A)

During ignition start, the FADEC powers up and the engine ECAM page is shown to monitor the start sequence. At this moment, the environmental control system automatically closes the pack valves. This prevents bleed air from the packs from being drawn during the critical start phase, ensuring the available bleed air can be used for starting the engine and not diverted to cabin conditioning. Once the engine is stabilizing and start is complete, the packs can reopen to supply cabin air. The other options don’t fit this phase: the engine does not start automatically just by selecting IGN START, fuel pumps aren’t commanded solely by this position, and activating A20PU isn’t the immediate consequence described here.

During ignition start, the FADEC powers up and the engine ECAM page is shown to monitor the start sequence. At this moment, the environmental control system automatically closes the pack valves. This prevents bleed air from the packs from being drawn during the critical start phase, ensuring the available bleed air can be used for starting the engine and not diverted to cabin conditioning. Once the engine is stabilizing and start is complete, the packs can reopen to supply cabin air. The other options don’t fit this phase: the engine does not start automatically just by selecting IGN START, fuel pumps aren’t commanded solely by this position, and activating A20PU isn’t the immediate consequence described here.