Instrument Rating Ground Practice Exam 2025 – Comprehensive All-in-One Guide to Success!

When the air induction source of a CE-172 is blocked with ice, the design includes an alternate induction air door that opens automatically. This feature is critical because it allows the engine to continue receiving a sufficient supply of air to operate effectively. Ice blockage can significantly restrict airflow, leading to engine performance issues or a potential stall.

By opening the alternate air source, the engine can draw in air from another part of the aircraft, bypassing the blockage. This automatic response ensures that the pilot does not have to intervene manually, which makes it a critical safety feature. Maintaining airflow to the engine is essential for optimal operation, especially in conditions where ice may form.

The other options, while addressing potential responses to an icy air induction system, do not accurately describe the function of the airplane’s design regarding ice blockage. The automatic opening of the alternate air door is a proactive safety measure designed to enhance engine reliability and performance in adverse weather conditions.