Which of the following is used for both direct entry and exit for crew members?

The crew entrance door is specifically designed to facilitate both the entry and exit of crew members in an aircraft. This door provides a primary means of accessing the cockpit or crew area and is typically utilized during normal operations, such as boarding and deplaning. Its design ensures ease of use for crew members, allowing for a straightforward transition into and out of the aircraft.

Overhead escape hatches and emergency exits, while they are crucial for evacuations or exiting in emergency situations, are not primarily intended for routine entry and exit of crew members. These hatches and exits are often utilized during emergencies to ensure quick evacuation rather than for normal boarding procedures. Side escape hatches may also serve primarily as an emergency outlet rather than a standard entry point, focusing on safety and swift evacuation.

In contrast, the crew entrance door’s dual function makes it a central aspect of crew mobility, thus establishing it as the correct answer in this scenario.