What is the engine idle time prior to shutdown?

• A. 2 minutes
• B. 4 minutes
• C. 3 minutes
• D. 5 minutes

Answer: (C)

The required idle time before shutdown is a cooldown period. After operating at higher power, letting the engine idle for a short, specified time allows temperatures and oil pressures to settle gradually, reducing thermal and mechanical stress on bearings, gears, and the fuel/oil systems. This helps prevent damage from abrupt shutdown and preserves engine life.

Three minutes is the duration defined for this cooldown. Too short a period (like two minutes) may not give enough time for the oils and components to stabilize, while longer periods (four or five minutes) would unnecessarily delay shutdown without added safety benefit. So three minutes strikes the proper balance and is the correct requirement.