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 principle states that pressure applied to an enclosed fluid is transmitted equally in all directions?
Answer: Pascal's law
Pascal's law states that pressure applied to a confined fluid is transmitted undiminished in all directions throughout the fluid.
Which type of hydraulic fluid is most commonly used in modern commercial transport aircraft in the US?
Answer: Skydrol (phosphate ester-based)
Skydrol, a phosphate ester-based fluid, is the most widely used hydraulic fluid in modern commercial transport aircraft because of its fire-resistant properties.
What is the primary function of an aircraft hydraulic accumulator?
Answer: To store pressurized fluid and dampen pressure surges
A hydraulic accumulator stores pressurized fluid under a pre-charged gas pressure to dampen system pressure surges and provide an emergency fluid reserve.
What safety precaution must be taken before opening any hydraulic line on an aircraft?
Answer: Depressurize the hydraulic system completely
The hydraulic system must be fully depressurized before opening any line to prevent high-pressure fluid injection injuries and uncontrolled actuator movement.
What does a hydraulic system relief valve do?
Answer: Limits maximum system pressure by bypassing fluid back to the reservoir
A relief valve protects the hydraulic system by opening to route fluid back to the reservoir when system pressure exceeds the maximum allowable limit.
What color is MIL-H-5606 mineral-based hydraulic fluid used in some general aviation aircraft?
Answer: Red
MIL-H-5606 is a red, petroleum-based hydraulic fluid used in many general aviation aircraft and some military applications.