What must be accomplished after engine shutdown during the inspection process of an aircraft?

After engine shutdown during the inspection process of an aircraft, it is essential to install gear pins. This procedure is critical because gear pins are safety devices that prevent the landing gear from accidentally retracting while maintenance is being performed. By installing these pins, ground crew can ensure that the landing gear remains in a safe, locked position, allowing for a thorough and safe inspection of the aircraft.

The other options do not represent immediate priorities following engine shutdown for inspection. Completing maintenance training is an ongoing requirement for personnel but does not pertain specifically to the actions taken after an engine shutdown. A flight status review, while necessary, typically pertains to pre-flight preparations rather than post-engine shutdown inspections. Refueling the aircraft is a separate process that occurs later in the maintenance or pre-flight routine, not immediately after shutdown.