Can we use the engine high power schedule switch?

• A. Yes
• B. No
• C. Only on request
• D. Only with approval

Answer: (B)

Understanding when an engine high power schedule can be engaged. In normal operations, this switch isn’t used because it can push the engine beyond its approved performance envelope and bypass automatic protections. Engaging a higher power setting without a defined procedure and authorization can stress the engine, affect fuel flow and temperatures, and create handling or safety risks. The standard approach is to operate within the power settings set by the flight control system and approved procedures for takeoff and climb. Only during specific, formally approved tests or with explicit instruction from the operating authority should a high power schedule be used. For these reasons, it should not be used in routine operations.