How do the left/right throttle levers work?

• A. The left/right throttle levers independently control the left/right engines respectively. Throttle commands and feedback signals are sent to and received from each FADEC.
• B. Both levers control both engines simultaneously.
• C. The left lever controls the left engine while the right lever controls the right engine, but signals are not sent to FADEC.
• D. The levers are for cockpit lighting.

Answer: (C)

The left and right throttle levers are a pair that provide independent power control for the two engines. Each lever sets thrust for its own engine—the left lever controls the left engine and the right lever controls the right engine. In the Growler, each engine is managed by its own FADEC, which takes the throttle position as input and then commands fuel flow to achieve the desired engine speed and thrust. The FADEC also sends feedback and status information back to the cockpit as part of engine monitoring and protection. The levers may be mechanically linked for synchronization, but the control path and engine power setting are still per-engine through the FADEC. Therefore, the idea that throttle position doesn’t involve FADEC signaling isn’t consistent with how the system actually operates.