Where is the underwater locator device located in an aircraft?

The underwater locator device (ULD), commonly known as an underwater locator beacon, is typically attached to both the cockpit voice recorder (CVR) and the flight data recorder (FDR). When in water, the ULD activates and emits acoustic signals that help locate the recorders, which are crucial for investigating an aircraft accident. These recorders are often housed in protective enclosures, making them durable against harsh conditions, but the ULD is specifically designed to be an integral part of both the CVR and FDR to ensure they can be found quickly after a potential water landing or crash.

Considering other options, having the ULD in the cockpit ceiling or the left wing would not be practical, as these locations do not align with the design and purpose of the ULD in relation to flight recorders. Similarly, while some might assume the tail section as a potential location, it is not where the ULD is housed.