Final answer:
An autonomous vehicle (AV) will engage in pre-programmed procedures such as returning to a home location, hovering, or a safe landing upon the expiration of the lost comm timer, depending on the system's design and operational procedures.
Step-by-step explanation:
The question seems to relate to aviation communication protocols, specifically what an autonomous vehicle (AV), such as an unmanned aerial vehicle (UAV) or drone, will do upon the expiration of the lost comm timer. In aviation, if communication is lost with an unmanned vehicle, it often has pre-programmed procedures to ensure safety.
These procedures may include returning to a pre-set home location, hovering in place until communications are re-established, or executing a safe landing sequence to prevent accidents. The specific action an AV will take can vary depending on the design of the system and the operational procedures defined by the manufacturer or the regulatory body governing the airspace where the AV operates.