In a pressure cooling system, after the air passes over the fins, where does it flow?

• A. Back into the cowling inlet.
• B. Out through the exhaust.
• C. To a cabin area.
• D. To a low-pressure area on the opposite side.

Answer: (D)

In a pressure cooling system, the air is forced by a blower to flow across the engine’s cooling fins to remove heat. After passing the fins, the air must exit to keep the flow going, and it does so by moving into a low‑pressure region on the opposite side of the cowling. This pressure difference pulls the air through and out, sustaining cooling across a range of engine speeds and power settings. The air isn’t sent back into the inlet, out the exhaust, or redirected to the cabin area in this cooling arrangement.