Final answer:
Annual inspections of a helicopter's transmission gearbox should be guided by the manufacturer's maintenance manual and aviation regulations to ensure its proper function in the transfer of energy within the aircraft.
Step-by-step explanation:
When performing an annual inspection of a helicopter main rotor transmission gearbox, the inspection should be accomplished in accordance with the manufacturer's maintenance manual and federal aviation regulations. These resources provide detailed procedures for examining the gearbox, which includes checking for signs of wear, ensuring proper lubrication, and looking for any potential defects or damage. The gearbox plays a critical role in transmitting power from the engine to the main rotor blades, which are responsible for generating lift and allowing the helicopter to fly. Understanding the relationship between the rotational kinetic energy of the blades and the translational kinetic energy of the helicopter helps in appreciating the significance of the gearbox in maintaining proper helicopter function.