10 Questions
What happens when the force limiting device engages the actuator?
The engagement of the force limiting device stalls the actuator, which then trips one of the system safety monitors and disengages the complete flap actuation system.
How does the ratchet pawls and skewed roller assembly function during flap retraction?
During flap retraction, the ratchet pawls ground the ratchet plate and force the skewed roller assembly to rotate. The skewed roller assembly provides braking torque proportional to the ballscrew load, and this braking torque is greater than the corresponding torque generated by the lead of the ballscrew.
What is the purpose of the 'no back brake' in the flap actuation system?
The 'no back brake' is configured such that each no back brake is sufficient to hold position in the event that the other actuator in the same flap panel has dormant failed no back brake. This reduces the probability of the no back dormant failure.
How is the 'no back brake' designed to prevent common mode failure?
The 'no back brake' is designed with two ratchet pawls, springs, and different materials to preclude common mode failure. Additionally, the ratchet pawls are spaced such that they click into the ratchet plate at different times, facilitating an audible in-service check on the no back pawl functionality.
What is the purpose of the flap hydraulic control module (HCM)?
The flap HCM is located in the main landing gear wheel well and receives command inputs from the FECU to extend or retract the flaps.
What is the purpose of the dual channel sensor (resolver) in the flap actuation system?
The text does not provide any information about a dual channel sensor (resolver) in the flap actuation system. The given text does not mention a dual channel sensor or resolver.
How does the braking torque generated by the skewed roller assembly compare to the torque generated by the ballscrew lead?
The braking torque generated by the skewed roller assembly is greater than the corresponding torque generated by the lead of the ballscrew.
What is the 'no back brake gain' and how is it configured in the flap actuation system?
The 'no back brake gain' is the ratio of the braking torque divided by the ballscrew back driving torque. It is configured such that each no back brake is sufficient to hold position in the event that the other actuator in the same flap panel has a dormant failed no back brake.
How does the engagement of the force limiting device affect the flap actuation system?
The engagement of the force limiting device stalls the actuator, which then trips one of the system safety monitors and disengages the complete flap actuation system.
What is the purpose of the audible in-service check on the no back pawl functionality?
The ratchet pawls are spaced such that they click into the ratchet plate at different times, which facilitates an audible in-service check on the no back pawl functionality.
Test your knowledge on aircraft flap actuators, which extend and retract trailing edge flaps by converting rotary input torque into linear motion and force. Learn about the components and functions of inboard and outboard flap actuators.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
