Which type of aircraft door is most commonly used for emergency exits?

• A. Rotary Door
• B. Bi-fold Door
• C. Plug-Type Door
• D. Sliding Door

Answer: (C)

The plug-type door is the most commonly used design for emergency exits on aircraft due to its effective sealing capabilities and the way it locks into the airframe. When the aircraft is pressurized during flight, the door is pressed into its frame, making it nearly impossible to open while the aircraft is in the air. This feature is essential for safety, as it prevents accidental opening at high altitudes.

In an emergency situation, a plug-type door can be designed to swing inward for easier access from the outside. This design facilitates a quick evacuation while ensuring that the door can be opened easily once the pressure differential has been equalized during an emergency landing.

Other door types, such as rotary, bi-fold, and sliding, may not provide the same level of pressurization safety or ease of access, making the plug-type door the preferred choice for emergency egress in aviation design.