Which statement about the DEC's insulation is true?

Which statement about the DEC's insulation is true?

• A. Does NOT have an insulation blanket and is cooled by airflow through the scroll case
• B. Has an insulation blanket
• C. Is cooled by liquid coolant
• D. Is located in the cockpit

Answer: (A)

The DEC is kept cool by directing ambient air through the scroll case to flow across it, rather than being surrounded by insulation. Insulation would trap heat and hinder that cooling air path, increasing the risk of overheating the DEC. It doesn’t use liquid coolant, and it isn’t located in the cockpit; it sits in the engine area where the scroll-case airflow can effectively remove heat. So the best description is that it does not have an insulation blanket and is cooled by airflow through the scroll case.

The DEC is kept cool by directing ambient air through the scroll case to flow across it, rather than being surrounded by insulation. Insulation would trap heat and hinder that cooling air path, increasing the risk of overheating the DEC. It doesn’t use liquid coolant, and it isn’t located in the cockpit; it sits in the engine area where the scroll-case airflow can effectively remove heat. So the best description is that it does not have an insulation blanket and is cooled by airflow through the scroll case.