When should the engine oil quantity be checked on a turbine engine?

• A. During flight after the engine is shut down.
• B. After the engine has cooled for 1 hour.
• C. As soon as practical after the engine is shut down.
• D. Before starting the engine.

Answer: (C)

Check after shutdown, as soon as practical. When the engine is running, oil is circulating and the level can appear different due to pressure, foaming, and hot oil volume. Reading the quantity soon after the engine is shut down lets the oil settle back into the reservoir and gives a dependable indication of how much oil is actually in the system, so you can top up if needed before the next operation. Waiting longer, such as after cooling for an extended period, can let oil drain to other areas or change volume with temperature, making the reading less representative. So the best practice is to verify the oil quantity as soon as practical after shutdown and before restarting.