Sequence valves are used in aircraft having a retractable undercarriage because there is a certain sequence to the way things must be done. For example, before the landing gear can come down, the door on the undercarriage must be opened… Full Answer
This answer depends on what damage the undercarriage has. If it is just minimal rust the it can be left with some anti rust protectant. If it is bent a body shop will need to attempt to straighten it out.
Cars are open underneath, so that mice can climb into the undercarriage. Before long, it's possible that mice have chewed their way into the cab of the vehicle, where there are more useful materials -- for a mouse anyway… Full Answer
Undercarriage damage usually refers to the wheels, suspension and axles. There can be a variety of damage to all of these parts...literally hundreds of possibilities from flat tires and damaged wheels to broken shocks, springs, steering mechanism and axles.