Final answer:
Yes, the gust lock can be used to hold the blades in place for maintenance testing in an aircraft equipped with a rotor brake.
Step-by-step explanation:
Yes, the gust lock can be used to hold the blades in place for maintenance testing in an aircraft equipped with a rotor brake. The gust lock is a mechanism that immobilizes the rotor blades, preventing them from rotating in response to wind or other external forces. This is important during maintenance to ensure the safety of personnel working on the aircraft. The rotor brake, on the other hand, is used to stop the rotation of the rotor blades in normal operation, and it can also be used in conjunction with the gust lock to hold the blades in place during maintenance.