Final answer:
Aircrew flight equipment continuation training lesson plans must be validated periodically, often annually, as specified by the relevant military branch's regulations, such as the Air Force Instruction (AFI) in the case of the US Air Force.
Step-by-step explanation:
The frequency at which aircrew flight equipment continuation training lesson plans must be validated can vary depending on the specific branch of the military and its regulations. Typically, the guidance on these procedures can be found in the official regulations or manuals provided by the military branch in question.
For example, in the United States Air Force, Air Force Instruction (AFI) 11-301, Volume 1, might state that such training plans should be reviewed on an annual basis to ensure they remain current with the latest operational requirements, safety standards, and technological advancements. This validation ensures that aircrew are well-informed and proficient with the necessary flight equipment and emergency procedures.