Landing Gear & Brake Systems Flashcards

Nose wheel shimmy on an aircraft is most commonly caused by:

Answer: Worn or defective shimmy damper, loose torque links, or improper tire balance

Nose wheel shimmy is most commonly caused by a defective or depleted shimmy damper, loose torque link bearings, or an out-of-balance tire/wheel assembly.

When bleeding aircraft brakes, the correct procedure is to bleed from:

Answer: The wheel cylinder bleeder valve upward to the master cylinder reservoir

Aircraft brakes are bled from the bottom (wheel cylinder bleeder) upward so that air bubbles, being lighter than fluid, travel upward and out through the reservoir.

What does a landing gear squat switch (weight-on-wheels switch) do?

Answer: Prevents gear retraction on the ground and enables ground-only functions

The squat switch prevents inadvertent gear retraction while the aircraft is on the ground and may also enable ground spoilers, thrust reversers, or other ground-only systems.

The correct nitrogen pressure for servicing an aircraft oleo strut is found in the:

Answer: Aircraft Maintenance Manual for the specific aircraft

Nitrogen servicing pressure for an oleo strut is specified in the Aircraft Maintenance Manual and varies by aircraft type, strut position, and aircraft gross weight.

What is the purpose of wheel well doors on a retractable landing gear aircraft?

Answer: To reduce aerodynamic drag by closing the gear cavity when retracted

Wheel well doors close over the landing gear bay after retraction to create a smooth aerodynamic surface and reduce drag.

Which condition requires immediate replacement of a landing gear actuating cylinder?

Answer: Internal bypass causing the gear to drift from locked position under load

Internal bypass (fluid passing the piston seals) causes the actuator to drift from its locked position under load, which is a safety-critical failure requiring immediate replacement.