AME - Aircraft Maintenance Engineer Hydraulic and Pneumatic Systems Questions and Answers

Question 1

An AME is troubleshooting an aircraft hydraulic system and observes that the system pressure fluctuates rapidly and excessively when a component is operated.
The pump is known to be in good condition.
What is the most likely cause of this issue?

Accepted Answer

The accumulator has lost its nitrogen pre-charge.

Answer

The system filter is completely clogged.

Answer

The hydraulic fluid is contaminated with water.

Answer

The system relief valve is stuck in the open position.

Question 2

Which of the following is a critical safety and maintenance consideration when working with phosphate ester-based hydraulic fluids such as Skydrol?

Accepted Answer

It is an excellent paint remover and is harmful to many traditional aircraft finishes and plastics.

Answer

It is highly compatible with natural rubber seals and most standard paints.

Answer

It is non-toxic and requires no special personal protective equipment.

Answer

It has a low flash point, making it more flammable than mineral-based fluids.

Question 3

What is the primary operational characteristic of a constant-delivery hydraulic pump, such as a gear-type pump?

Accepted Answer

It delivers a fixed volume of fluid per revolution, regardless of system pressure.

Answer

It varies its output flow based on system pressure demand.

Answer

It requires no system pressure regulator as it self-regulates.

Answer

It can only operate effectively at low RPMs.

Question 4

An AME is tasked with replacing a component in the aircraft's high-pressure pneumatic system. Before loosening any fittings on the component, what is the most critical safety step that must be performed?

Accepted Answer

Confirm that the specific pneumatic system has been fully depressurized by checking the pressure gauge.

Answer

Verify the component's part number matches the maintenance manual.

Answer

Ensure the aircraft's electrical and hydraulic systems are depowered.

Answer

Don appropriate personal protective equipment (PPE).

Question 5

In a typical large transport aircraft, which component is primarily responsible for regulating the pressure and temperature of engine bleed air before it is distributed to various pneumatic systems?

Accepted Answer

The Pressure Regulating and Shutoff Valve (PRSOV).

Answer

The pneumatic system check valve.

Answer

The APU load compressor.

Answer

The cabin outflow valve.

Question 6

Which of the following is considered the primary cause of wear and malfunction in the majority of aircraft hydraulic systems?

Accepted Answer

Particulate contamination in the fluid.

Answer

Fluid viscosity breakdown due to high temperatures.

Answer

Entrained air causing cavitation.

Answer

Chemical breakdown from exposure to UV light.

An AME is troubleshooting an aircraft hydraulic system and observes that the system pressure fluctuates rapidly and excessively when a component is operated.The pump is known to be in good condition.What is the most likely cause of this issue?

An AME is troubleshooting an aircraft hydraulic system and observes that the system pressure fluctuates rapidly and excessively when a component is operated.
The pump is known to be in good condition.
What is the most likely cause of this issue?