What happens to flight control if the pressure in the main transmission drops significantly?

• A. Flight becomes unstable
• B. Power is transferred to the tail rotor
• C. Operations are normal
• D. Flight control is unaffected

Answer: (A)

When pressure in the main transmission drops significantly, flight control can become unstable. The main transmission in a helicopter is crucial for transferring power from the engine to the rotor system, which directly impacts the helicopter's ability to maintain controlled flight. A drop in pressure can lead to a loss of power or inconsistent power delivery to the rotors, which can make it difficult to maintain stable hover or forward flight. This instability can result in unexpected changes in the aircraft's attitude or altitude, creating a challenging situation for the pilot. Thus, the correct choice reflects the potential for significant safety implications tied to pressure loss in the main transmission system.