What are the dry motoring limits?

What are the dry motoring limits?

• A. 2 min motoring; 5 min rest
• B. 10 min motoring; 20 min rest
• C. 15 min motoring; 30 min rest
• D. 5 min motoring; 15 min rest

Answer: (D)

Dry motoring limits tell you how long you can rotate the engine without fuel while checking its systems, and how long you must rest afterward to protect the engine. For this aircraft, you should only motore for five minutes, then allow a fifteen-minute rest. This short duration helps prevent overheating and lubrication stress since there’s no combustion to share the heat, and the rest period gives the oil and components a chance to cool and re-establish proper pressure before any further checks. Longer motoring times or shorter rests increase the risk of oil starvation, bearing wear, or other damage.

Dry motoring limits tell you how long you can rotate the engine without fuel while checking its systems, and how long you must rest afterward to protect the engine. For this aircraft, you should only motore for five minutes, then allow a fifteen-minute rest. This short duration helps prevent overheating and lubrication stress since there’s no combustion to share the heat, and the rest period gives the oil and components a chance to cool and re-establish proper pressure before any further checks. Longer motoring times or shorter rests increase the risk of oil starvation, bearing wear, or other damage.