How many portable battery-powered megaphones are required on an air carrier airplane with a seating capacity of 100 passengers when 45 passengers are carried?

The requirement for portable battery-powered megaphones on an air carrier airplane is based on ensuring effective communication in case of an emergency, particularly in passenger evacuation scenarios. For an aircraft with a seating capacity of 100 passengers, regulations stipulate that two megaphones are necessary, regardless of the actual number of passengers carried (in this case, 45).

The correct answer specifies that one megaphone should be placed at the forward end of the cabin, while the other is positioned at the most rearward location of the passenger cabin. This arrangement is critical because it ensures that the flight crew can communicate with all passengers effectively, regardless of where they are seated. By placing one megaphone at the front and another at the back, the flight crew can relay messages to both ends of the cabin, facilitating prompt and efficient communication.

This configuration also minimizes the chances of having a scenario where passengers at either end of the cabin cannot hear instructions due to distance or cabin layout, which is crucial during an evacuation or emergency situation. Thus, maintaining two accessible points for communication enhances safety and compliance with aviation regulations related to passenger safety and crisis management.