In a wet motor check, which statement is true?

• A. Spool with fuel and igniters
• B. Spool with air
• C. Spool without fuel
• D. Spool with fuel, without igniters

Answer: (D)

Wet motor checks are about turning the engine over using the fuel system while keeping ignition disabled, so there’s rotation without combustion. This lets you verify lubrication, bearings, oil pressure, seals, and overall mechanical integrity while avoiding the stresses of firing the engine. Spooling with fuel but without igniters is the right approach because fuel is supplied to drive the rotation, but ignition is withheld to prevent combustion. Spooling with air would rely on external pneumatic power and doesn’t test the fuel system. Spooling without fuel is dry motoring and doesn’t exercise the fuel delivery. Spooling with fuel and igniters would ignite and defeat the purpose of a wet motor check.