A loud hammering noise in a hydraulic system having an accumulator usually indicates

(1) Relief valves are used in pneumatic system as damage-preventing units. (2) Check valves are used in both hydraulic and pneumatic systems. Regarding the above statements

The main system pressure relief valve in a simple hydraulic system equipped with a power control valve should be adjusted.

Hydraulic accumulator is charge with an air preload of 1000 PSI. when a hydraulic system pressure of 3000 PSI is developed, the pressure on the air side of the accumulator will be

Refer to Airframe (Figure No. 12) Which illustration (s) show (s) the correct spiral for teflon backup rings?

Refer to Airframe (Figure No. 11) Which fitting is an Airforce Navy (AN) flared tube fitting?

Which seals are with petroleum base hydraulic fluids?

What is one advantage of piston type hydraulic motors over electric motors?

An emergency supply of fluid is often retained in the main hydraulic system reservoir by the use of a standpipe. The supply line is connected to the

In a hydraulic system that has a reservoir pressurized with turbine-engine compressor bleed air, which unit reduces the air pressure between the engine and reservoir.

Quick-disconnect couplings in hydraulic system provide a means of

Components containing phosphate ester-based hydraulic fluid may be cleaned with

Characteristics of MIL-H-5606

Some hydraulic system incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as

A worn hydraulic pump shaft seal can normally be detected by

The internal resistance of fluid which tend to prevent it from flowing is called

Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in

Heat exchanger cooling units are required in some aircraft hydraulic system because of

A unit which transforms hydraulic pressure which linear motions is called

Which seal/material is ised with phosphate ester base hydraulic fluid?

Petroleum base hydraulic fluid is which color?

A flexible sealing element subject to motion is a

Chatter in a hydraulic system is cause by

Which is a characteristic of synthetic base hydraulic fluid?

A hydraulic pump is a constant -displacement type if it

How can the proper hydraulic fluid to be used in an airplane be determined?

The purpose of restrictors in the hydraulic system is to

The component in the hydraulic system that is used to direct the flow of fluid is the

Seals used with a mineral base gudraulic fluid are identified by which color code?

Which valve installed in a hydraulic system will have the highest pressure setting?

Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of a hydraulic tube providing they are less than what percent of the tube damenter

What is the main purpose of a pressurized reservoir in a hydraulic system?

What functions does the absolute pressure regulator perform in the pneumatic power system?

The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is

Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should

One of the distinguishing characteristics of an open-center selector valve use in a hydraulic system is that

Using a hand pump pressure of 100 psi has been built up in a hydraulic system, the hand pump piston is 1 inch in diameter. A 1/2 inch line connects the hand pump to an actuating cylinder 2 inches in diameter. What is the pressure in the line between the hand pump and the actuator?

An aircraft pneumatic system which incorporates an engine-driven multistage reciprocating compressor, also requires

Select the valve used in a hydraulic system that directs pressurized fluid to one end of an actuating cylinder and simultaneously directs return fluid to the reservoir from the other end.

Before removing the filler cap of a pressurized hydraulic reservoir, in order to service the system, you must

What types of selector valve is one of the most commonly used in hydraulic system to providing for simultaneous flow of fluid into and out of a connected actuating unit?

If hydraulic fluid is released when the air valve core of the accumulator is deressed, it is evidence

What is the purpose of using backup rings with O-rings in hydraulic systems above 1500 psi?

When hydraulic system pressure control and relief units fail to function properly. How are most systems protected against over pressure

How many of these seals are used with petroleum base hydraulic fluids?

If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening

Which of the following is adversely affected by atmospheric humidity if left unprotected?

Characteristics of MIL-H-8466 (skydrol 500 A & B) hydraulic fluids are

Hydraulic fluid filtering elements constructed of pours papers are normally

Which seal/material is used with phosphate ester base hydraulic fluids?

A hydraulic motors convert fluid pressure to

One of the main advance of skydrol is its

A hydraulic system operational check during ground runup the wing flaps cannot be allowed using the main hydraulic system, but can be lowered by using the emergency likely cause

A pilot reports that when the hydraulic pump is running, the pressure is normal. However when pump is stopped no hydraulic pressure is available. This is an indication of a

Two types of hydraulic fluids currently being used in civil aircraft are

A characteristic of MIL-H-7644 hydraulic fluid are

(1) materials which are skydrol compatible or resistant include most common aircraft metals and polyurethane and epoxy paints (2) skydrol hydraulic fluid is compatible with nylon and natural fibers regarding the above statements

After installation of a rebuilt hydraulic hand pump. It is found that the handle cannot be moved in the pumping directions (pressure stroke). The most likely cause is an incorrectly installed

How is the air in a hydraulic accumulator prevented fron entering the fluid system?

If an aircraft's constant pressure hydraulic system and no more frequently than detected the most probable cause is

Excluding lines , which components are required to make up a simple hydraulic system?

What safety device is usually located between the driving unit and hydraulic pump drive shaft?

A crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the side, under certain conditions, may be found in some aircraft installed in the

If a hydraulic brake system use neoprene rubber packing materials, the correct hydra fluid to service the system is

The primary purpose of a hydraulic actuating unit is to transform

Unloading valves are used with many engine-driven hydraulic pumps to

Where can information be obtained about the compatibility of fire resistant hydraulic fluid with aircraft materials?

Phosphate ester base hydraulic fluid is very susceptible to contamination from

A common cause of slow actuation of hydraulic components is

Which allows free fluid flow in one direction and no fluid flow in the other direction?

Which allows free fluid flow in one direction and no fluid flow in the other direction?

What type of packings should be used in hydraulic components to be installed in a system containing skydrol?

In a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump fron overload is the

Most variable displacement aircraft hydraulic pumps in use.

To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the

Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?

Hydraulic pump system accumulating serve which of the following instructions?

If it is necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?

Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet ports in order to assure emergency supply of fluid. The outlet port with the standpipe in it furnishes fluid to the

Generally the first step in removing an accumulator from an aircraft is to

Pneumatic systems utilize

Chattering of the hydraulic pump during operation is an indication

Which valve installed in a hydraulic system will have the highest pressure setting?