Aircraft Landing Gear Systems Flashcards

When bleeding aircraft brakes, fluid should flow:

Answer: From the brake assembly upward toward the reservoir to purge air bubbles

Aircraft brakes are bled from the brake assembly (bottom) upward toward the reservoir so that air bubbles, which are lighter than fluid, naturally rise and are carried out of the system.

Fusible plugs installed in aircraft wheel assemblies are designed to:

Answer: Melt and deflate the tire in a controlled manner if wheel temperature reaches a dangerous level

Fusible plugs melt at a predetermined temperature caused by overheated brakes, releasing tire pressure in a controlled manner to prevent explosive tire failure and potential aircraft damage.

Brake fade is primarily caused by:

Answer: Excessive heat reducing the coefficient of friction between braking surfaces

Brake fade occurs when brakes overheat during repeated or prolonged application, causing a significant reduction in the friction coefficient between brake linings and rotors, reducing stopping effectiveness.

Multiple-disc brakes used on transport category aircraft offer which primary advantage over single-disc designs?

Answer: Greater braking force from more friction surface area within a compact, lighter assembly

Multiple-disc brakes stack alternating rotating and stationary discs to provide a large total friction area within a compact, weight-efficient package suitable for heavy aircraft with limited wheel well space.

During landing gear rigging, verifying the retraction cycle time is necessary to:

Answer: Confirm the gear retracts within the time limits specified in the aircraft maintenance manual

Retraction cycle time is compared against manufacturer-specified limits to confirm correct hydraulic system pressure, flow rates, and sequencing valve operation throughout the gear retraction sequence.

The uplock mechanism in a retractable landing gear system serves to:

Answer: Hold the gear in the fully retracted position and prevent free-fall extension in flight

The uplock hook mechanically secures the landing gear in the fully retracted position, preventing it from falling due to gravity or aerodynamic forces if hydraulic pressure is lost.

When servicing an oleo-pneumatic shock strut, the correct extension of the inner cylinder piston is:

Answer: Specified in the aircraft maintenance manual for a given loading condition

Correct strut extension depends on aircraft loading and is specified in the maintenance manual; achieving it requires correct nitrogen servicing pressure and proper hydraulic fluid level measured under defined conditions.