APR stands for what term in engine performance terminology?

APR stands for what term in engine performance terminology?

• A. Automatic Power Reserve
• B. Automatic Performance Reserve
• C. Auto Pilot Reserve
• D. Automatic Performance Readjustment

Answer: (B)

APR stands for Automatic Performance Reserve. This term describes an automatic system that maintains a defined buffer of engine performance beyond what is currently required, giving the aircraft extra capability to handle unexpected demands or difficult conditions. The idea is to have thrust/power available automatically to meet climb gradients, handle engine-out situations, or compensate for changes in weight, temperature, or altitude. The phrasing emphasizes a reserve related to overall performance, not just a single parameter like power or an unrelated function like autopilot, which is why it’s the best fit.

APR stands for Automatic Performance Reserve. This term describes an automatic system that maintains a defined buffer of engine performance beyond what is currently required, giving the aircraft extra capability to handle unexpected demands or difficult conditions. The idea is to have thrust/power available automatically to meet climb gradients, handle engine-out situations, or compensate for changes in weight, temperature, or altitude. The phrasing emphasizes a reserve related to overall performance, not just a single parameter like power or an unrelated function like autopilot, which is why it’s the best fit.