Boeing 747-8 System Practice Exam

What provides lower aft cargo heat and how is the temperature controlled?

Electrical heater in the compartment. Bleed air from the center section of the bleed air duct, with a thermal switch opening the valve when the compartment is cool and closing the valve when it warms. Bleed air from the center section of the bleed air duct, with a manual valve. Recirculated cabin air only.

Correct Answer:

Bleed air from the center section of the bleed air duct, with a thermal switch opening the valve when the compartment is cool and closing the valve when it warms.

Explanation:

Lower aft cargo heat comes from bleed air taken from the center section of the bleed air duct. This hot air is directed into the cargo area to raise its temperature as needed. Temperature is controlled automatically by a thermal switch that senses the cargo bay temperature and modulates a valve: when the bay is cool, the switch opens the valve to allow bleed air in; when the bay warms, the switch closes the valve to reduce or stop the flow. This automatic regulation maintains the desired temperature without using electric heaters or relying on passenger cabin air.

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