Final answer:
The thrust levers are moved to IDLE when engine N2 reaches a specific value, usually around 60-65% N2.
Step-by-step explanation:
In a normal start, the thrust levers of an aircraft are moved to IDLE when engine N2 reaches a specific value. N2 refers to the rotational speed of the high-pressure spool of the engine, which is measured as a percentage. The exact value at which the thrust levers are moved to IDLE can vary depending on the specific aircraft and engine model, but it is typically around 60-65% N2.