EASA Module 11 Practice Exam

The key idea is that an in-flight entertainment system needs a source of actual content in addition to the user interface and the seat-side processing. The passenger control unit is how the passenger selects options, and the seat electronic box handles decoding and control at the seat. The third major piece is the media source—the device that actually plays the content, such as a tape or DVD player. This provides the video and audio that are then distributed to the displays and speakers. A video projector isn’t typically part of most IFE setups since content is shown on screens at the seat or in overhead displays, a zone multiplexer is a routing/delivery component rather than the content source, and an amplifier, while important, is usually part of the distribution or seat electronics rather than the standalone third major component. So the media source best fits as the missing third piece.