Which component prevents movement of engine power levers from idle to fly when rotor brake is applied?

• A. Idle inter-lock lever
• B. Gust lock
• C. Rotor brake solenoid
• D. PCL selector switch

Answer: (C)

When the rotor brake is applied, you must prevent the engine power levers from moving from idle toward flight, so the rotor isn’t attempted to spin while it’s held stopped. The rotor brake solenoid provides the electronic/lock mechanism that keeps the rotor brake engaged and ties that brake state to the engine control system. In effect, energizing the rotor brake solenoid locks the brake and blocks advancement of the PCLs from idle to fly, preventing rotor acceleration while the brake is on. Gust lock and the PCL selector switch don’t create this interlock, and the idle inter-lock lever is a different safety function not specifically what enforces this brake-to-PCL restriction in this context.