FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Medium
A Part 121 airplane is certificated with 105 passenger seats. Under 14 CFR 121.313, how many megaphones must be installed and where?
- AOne megaphone for every 50 passenger seats, distributed evenly throughout the cabin
- BNo megaphones are required because a PA system is installed
- CTwo megaphones, one in the most forward location and one in the most rearward location of the passenger cabin
- DOne megaphone, located near the flight crew compartment
Show answer & explanationAnswer & explanation
Correct answer: C. Two megaphones, one in the most forward location and one in the most rearward location of the passenger cabin
14 CFR 121.313 requires one megaphone for airplanes with more than 60 passenger seats, and two megaphones (one forward, one aft) for airplanes with more than 99 passenger seats. With 105 seats, two megaphones are required.
Why the other options are wrong
- A. Megaphone quantity is based on fixed thresholds (60/99 seats), not a per-50-seat ratio.
- B. Megaphones are required regardless of PA system installation.
- D. One megaphone is insufficient once seating exceeds 99.
Megaphone Requirement (121.313)
Airplanes with more than 60 passenger seats must carry one megaphone; airplanes with more than 99 passenger seats must carry two, located at the most forward and most rearward points in the cabin.
- >60 seats = 1 megaphone
- >99 seats = 2 megaphones (forward & aft)
- Independent of PA system installation
Memory trick: 'Sixty for one, ninety-nine for two — front and back will do.'