Which of the following is an ECS subsystem?

• A. Canopy Seal
• B. Cabin pressurization
• C. Anti-G
• D. Wave guide pressurization

Answer: (A)

This question tests recognizing a tangible component that is part of the Environmental Control System’s ability to manage cockpit conditions. The canopy seal is a dedicated assembly that seals around the cockpit canopy, preventing outside air from leaking into the cockpit and helping maintain the pressure differential when the canopy is closed. Because it directly supports the ECS’s job of controlling the cockpit environment—air leakage, pressure, and overall climate—it is considered an ECS subsystem.

The other options don’t fit this role. Anti-G relates to protections against high G forces on the body, not air handling or pressure control. Wave guide is tied to RF signal paths and electronics, not environmental conditioning. Cabin pressurization is indeed an ECS function, but it’s a broader capability rather than a discrete component of the ECS; the question is asking for a specific ECS subsystem, and the canopy seal fits that description.