Final Answer:
Taxi or pushback is not allowed until at least one crew member has verified that an exit seat is not occupied by a passenger the crew member determines is likely to be unable to perform the applicable functions.
Step-by-step explanation:
In aviation protocols, safety during taxi or pushback is of paramount importance. Before these maneuvers, it is a regulatory requirement that at least one crew member ensures that exit seats are not occupied by passengers who might be unable to perform necessary functions in case of an emergency.
This precaution is taken to enhance the efficiency of evacuation procedures and to guarantee the safety of all passengers on board.
The responsibility for verifying the suitability of passengers seated in exit rows typically falls on the crew members, who assess passengers' ability to assist in case of an emergency. This includes ensuring that individuals occupying exit seats are physically capable and willing to assist with tasks like opening emergency exits and facilitating the evacuation process. This verification process is essential for maintaining aviation safety standards and adhering to regulations set by aviation authorities.