Which statement best describes a function of the engine control system regarding manual fuel flow control?

• A. To allow manual control of the fuel flow for starting, and in case of fuel control failure.
• B. To automatically regulate rotor speed at all times.
• C. To monitor cabin altitude exclusively.
• D. To override pilot inputs for engine trim.

Answer: (A)

Manual fuel flow control provides a direct way to adjust the amount of fuel going to the engine when starting and as a backup if the automatic fuel-control system isn’t functioning. This ensures you can set the proper starting mixture and prevent problems like hard starting or engine instability if the automatic system fails. The engine’s speed during normal operation is managed by a separate control system (a governor or automatic throttle), not by the manual fuel flow control, so automatic rotor-speed regulation isn’t the function being described here. Monitoring cabin altitude belongs to the environmental control system, not to engine fuel control. And engine trim involves shaping engine performance with guidance from the control system, not overriding pilot inputs through manual fuel flow.