Hydraulic, Ice & Rain and Landing Gear Systems

What type of hydraulic system use in large aircraft?

• Closed hydraulic system.

• Open hydraulic system.

• Simple hydraulic system.

Which of the following characteristics are essential for an effective hydraulic fluid?

• Low viscosity, high thermal stability, high flash point & low toxicity.

• High viscosity, low thermal stability, low flash point & high toxicity.

• Medium viscosity, high thermal stability, high flash point & low toxicity.

Which component is responsible for diverting hydraulic fluid back to the system when the primary filter becomes obstructed?

• pressure relief valve.

• by-pass valve.

• flow control valve.

When working on a hydraulic operated flight control it is sensible to

• remove and depressurize the hydraulic power.

• remove and disconnect electrical power.

• pull the appropriate circuit breaker.

The hydraulic component that automatically directs fluid from either the normal source or an emergency source to an actuating cylinder generally referred to as

• check valve.

• shuttle valve.

• flow regulator.

If the pilot selected the landing gear control to' up position' and during the transition suddenly the landing gear stuck. What is the most probable faulty valve?

• Shuttle valve.

• Sequence valve.

• Selector valve.

In a hydraulic pump, a mechanical safety device use to protect the pump from overload or damage is the

• shear pin.

• check valve.

• regulator valve.

What type of valve in an aircraft hydraulic system permits fluid to flow freely in one direction, but restricts the flow in the opposite direction?

• Shuttle valve.

• Orifice check valve.

• Check valve.

A red indicator button sticking up on the top of a hydraulic filter is an indication that the filter element is

• blocked or contaminated.

• not install properly.

• filter malfunction.

Which of the following component to component pipelines are identified as a case drain line

• from selector valve to reservoir.

• from reservoir to pump.

• from pump to reservoir.