Landing Gear & Brake Systems Flashcards

What type of seal is most commonly used in aircraft landing gear actuating cylinders?

Answer: Lip-type dynamic seals (O-rings with backup rings)

O-ring seals with backup rings are the standard dynamic seals in hydraulic actuating cylinders, preventing fluid bypass past the piston and rod.

How is main landing gear alignment (camber) typically checked on a light aircraft?

Answer: Plumb bob and straightedge measurements per the AMM alignment procedure

Landing gear alignment (camber, toe-in, toe-out) is checked using plumb bobs, straightedges, and alignment fixtures per the specific AMM procedure.

What is the correct way to check for proper landing gear downlock engagement?

Answer: Confirm the downlock indicator light illuminates AND mechanically verify the overcenter lock position

Proper downlock verification requires both the cockpit indicator light and a physical inspection confirming the overcenter or mechanical lock is fully engaged.

Aircraft brake assemblies with multiple discs (stacked rotors and stators) are typically used on:

Answer: High-performance and large transport category aircraft requiring high heat capacity

Multiple-disc brakes are used on high-performance and large aircraft because the stacked rotor/stator design provides greater heat capacity and stopping force than single-disc systems.

What is the purpose of antiskid system on aircraft brakes?

Answer: To prevent wheel lockup during braking, optimizing stopping distance and directional control

The antiskid system monitors wheel speed and modulates hydraulic pressure to prevent lockup, maximizing braking efficiency and maintaining steering control.

When installing a new wheel bearing on aircraft landing gear, the bearing should be:

Answer: Packed with the correct grease per the AMM specification before installation

Wheel bearings must be thoroughly packed with the specific grease type specified in the AMM to ensure proper lubrication and prevent corrosion.