Aviation Structural Mechanic Navedtra 14315 Chapter 11

Front 1

What unit transforms hydraulic fluid pressure into mechanical force, which performs work by moving some mechanism?

Back 1

an actuating unit

Front 2

Aircraft actuating cylinders are used when which of the following mechanism movements are required?

Back 2

linear or reciprocating motion

Front 3

If hydraulic pressure is used to move a single-acting actuating cylinder in only one direction, what force is used to move it in the opposite direction?

Back 3

spring tension

Front 4

The operation of a single-acting, spring-loaded, piston-type actuating cylinder is normally controlled by what component?

Back 4

a directional control valve

Front 5

Most piston-type actuating cylinders are of what type?

Back 5

double-acting type

Front 6

An unbalanced, double-acting, piston-type, actuating cylinder uses a directional control valve capable of directing fluid in what total number of ways?

Back 6

four

Front 7

When the cylinder is in the down and locked position, the locking ball bearings are held in the locking position by what means.

Back 7

a ball-lock plunger

Front 8

To equalize the displacement of fluid on either side of the piston, a double-action, finger-lock actuator incorporates what component?

Back 8

an inner cylinder

Front 9

During normal extension of a landing gear finger-lock actuator, what forces move the piston over the fingers?

Back 9

hydraulic pressure and spring tension

Front 10

In a power-operated flight control system, all the force necessary for deflecting the control surface is supplied by what type of pressure?

Back 10

hydraulic pressure

Front 11

A tandem-type, control surface, actuating cylinder uses a synchronizing rod for what purpose?

Back 11

to equalize the flow of fluid into the actuator piston chambers

Front 12

In the maintenance of actuating cylinders, what is the most common trouble encountered?

Back 12

external leakage

Front 13

What type of motor converts hydraulic pressure into rotary mechanical motion?

Back 13

a hydraulic motor

Front 14

Hydraulic motors are commonly used to operate what aircraft equipment?

Back 14

radar and wing flaps

Front 15

To relieve pressure created by thermal expansion of the fluid, a system that has a balanced poppet-type selector valve must also incorporate what other type of valve?

Back 15

a thermal relief valve

Front 16

The poppets of a poppet-type selector valve are actuated by what means?

Back 16

the cams on the camshaft

Front 17

When all four of the poppets of a poppet-type selector valve are held firmly seated by the springs and there is no fluid flow, the valve is in what position?

Back 17

the neutral position

Front 18

External leakage from a poppet-type selector valve could be caused by what condition?

Back 18

a damaged gasket under the sealing plug

Front 19

Currently, what type of selector valve is the most durable and trouble-free?

Back 19

the slide-type

Front 20

The slide-type selector valve has raised, machined portions that are know by what term?

Back 20

lands

Front 21

A slide-type selector valve has three grooves at the end next to the eye. The grooves are known by what term?

Back 21

detents

Front 22

A slide-type selector valve should have a light film of hydraulic fluid applied to the exposed areas of the slide primarily for what purpose?

Back 22

to prevent corrosion

Front 23

A solenoid-operated selector valve is controlled by what means?

Back 23

electrically

Front 24

A solenoid-operated selector valve directs the flow of fluid to and from the actuator by the use of what component?

Back 24

the selector slide

Front 25

For the proper cleaning, inspection, repair, and testing of selector valves, you should use what series of NAVAIR manuals as a guide?

Back 25

03 series

Front 26

When testing a solenoid selector valve, you must bleed all air from the valve before applying pressure for what reason?

Back 26

to prevent a leak from going undetected

Front 27

What is the purpose of a check valve?

Back 27

to allow fluid to flow in one direction only

Front 28

A bypass check valve differs from an automatic check valve in what way?

Back 28

It can be manually opened to allow fluid to flow in both directions

Front 29

In what two ways are sequence valves operated?

Back 29

mechanically operated or pressure-operated

Front 30

What are the two types of mechanically operated sequence valves?

Back 30

balanced and unbalanced

Front 31

Trouble associated with a mechanically operated sequence valve is most commonly a result of what problems?

Back 31

improper adjustment

Front 32

Isolation of the normal system from the emergency hydraulic system is the main function of what valve?

Back 32

the shuttle valve

Front 33

Excessive heating of a shuttle valve is a good indication of what type of problems?

Back 33

internal leakage

Front 34

An actuating units speed of operation is controlled by what component?

Back 34

a restrictor

Front 35

To retard the action of a hydraulic cylinder by limiting the lfow of fluid in both directions, you should use what device?

Back 35

a two-way restrictor

Front 36

What is the primary purpose of a hydraulic fuse?

Back 36

it is a safety device

Front 37

Hydraulic fluid entering a hydraulic fuse is divided into two flow paths by what means?

Back 37

the control head