If a duck overheat is sensed in the hot air system, the amber fault light in the hot air switch will illuminate, and the hot air valve will close automatically.

If a duck overheat is sensed in the hot air system, the amber fault light in the hot air switch will illuminate, and the hot air valve will close automatically.

• A. Only amber lights
• B. True
• C. False
• D. Only valve closes

Answer: (B)

When the hot air duct overheats, the protection logic in the A320 environmental control system engages both an alert and a safety action. A sensor detects the excessive temperature and triggers the amber fault light on the hot air switch to warn the crew. At the same time, the system automatically commands the hot air valve to close, stopping the bleed air flow and preventing further heating. This coordinated response is why the statement is true: both the amber indicator and the valve closure occur automatically.

When the hot air duct overheats, the protection logic in the A320 environmental control system engages both an alert and a safety action. A sensor detects the excessive temperature and triggers the amber fault light on the hot air switch to warn the crew. At the same time, the system automatically commands the hot air valve to close, stopping the bleed air flow and preventing further heating. This coordinated response is why the statement is true: both the amber indicator and the valve closure occur automatically.