AMT Hydraulics, Pneumatics & Landing Gear Flashcards
6 cards from real AMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 AMT Hydraulics, Pneumatics & Landing Gear flashcards as text
What is the purpose of an aircraft pneumatic system's pressure regulator?
Answer: To maintain a steady, controlled downstream pressure regardless of flow demand
A pressure regulator maintains constant downstream pressure by automatically adjusting flow from the high-pressure supply, protecting system components from over-pressure.
Which type of aircraft brake system uses hydraulic pressure applied to brake pads against rotating discs?
Answer: Disc brakes
Disc brakes, the most common type on modern aircraft, use hydraulic pressure to press brake pads (called linings) against a rotating disc (rotor) to create braking friction.
What is the function of an aircraft anti-skid system?
Answer: To automatically modulate brake pressure to prevent wheel lockup and tire skidding
An anti-skid system monitors wheel rotation speed and automatically reduces brake pressure on any wheel that decelerates too rapidly, preventing locked-wheel skids.
What condition must be checked before servicing an oleo strut with nitrogen to avoid a dangerous over-pressurization?
Answer: The current strut extension (fluid level) must be correct before adding nitrogen
Proper hydraulic fluid level must be verified and corrected before charging the nitrogen portion of an oleo strut; improper fluid level leads to incorrect extension and potential over-pressurization.
What does a hydraulic system flow control valve do?
Answer: It regulates the speed of hydraulic actuator movement by controlling fluid flow rate
A flow control valve restricts or regulates the volume of hydraulic fluid flowing to an actuator, thereby controlling the speed at which it extends or retracts.
What type of seal is most commonly used to prevent internal leakage in aircraft hydraulic actuating cylinders?
Answer: O-ring and backup ring seals
O-ring seals, often paired with backup rings to prevent extrusion under high pressure, are the standard seal used in aircraft hydraulic actuators to prevent internal leakage.