Chapter 8 Section C Jeppensen Airframe Flashcards
Virtually all modern airplanes use a simple hydraulic system to operate the _____.
Brakes
A hydraulic system must contain four basic types of units, these are;
A suitable fluid
A fluid reservoir
A pump
Actuators
A single unit containing an electrically driven hydraulic pump, reservoir, control valve and many of the auxiliary valves is known as a hydraulic _______ system.
Power pack
The two types of hydraulic-reservoirs are:
Integral
In-line
Aircraft that operate in the lower altitudes normally use _______ (pressurized or unpressurized) hydraulic reservoirs.
Unpressurized
Three ways of pressurizing a hydraulic reservoir are:
An aspirator in the return line
Bleed air
Piston type
One micron is equal to _____ Inch
0.000039
Pleated paper micronic filters are usually installed in the hydraulic system _________ line.
Return
Cuno filters _______be used on the pressure side of the hydraulic system.
Can
________ - action pumps are the most common type of hand pump.
Double
A ______ each time its shaft turns. Displacement pump moves a specific volume of fluid each time its shaft turns.
Constant
A(n) ______ valve of some sort is needed when a constant displacement pump is used.
Relief
A gear-type hydraulic pump is a _______ displacement pump.
Constant
A hydraulic system using a variable displacement pump ________ (does or does not) require an
unloading valve.
Does not
A selector valve is one of the most common types of _______ (flow or pressure)-control valves.
Flow
The _______ (open or closed)-center valve directs fluid through the center of the valve back to the reservoir when a unit is not being actuated.
Open
A valve that allows free flow of fluid in one direction, but no flow in the opposite directions called a(n) ______ valve.
Check
A valve that allows free flow of fluid in one direction but a restricted flow in the opposite is called a(n) _______ ________ valve.
Orifice Check
A valve that requires one component to fully actuate before another ran actuate is called a(n)
_______ valve.
Sequence
_______ valves are similar to sequence valves except they are opened by hydraulic pressure rather than by mechanical contact.
Priority
A(n) _______ _______ may be installed to block a line in case of a serious leak.
Hydraulic Fuse
Two principles upon which a hydraulic fuse may operate are:
Pressure drop across the fuse
Volume of fluid passing through the fuse
The simplest type of pressure control valve is the ______valve.
Relief
A(n) ______ ______ may be installed when it is necessary to operate some portion of a hydraulic system at a pressure lower than the normal system pressure.
Pressure Reducer
A(n) _______ is a simple device designed to store hydraulic fluid under pressure.
Accumulator
One compartment of an accumulator is connected to the hydraulic system, and the other compartment is filled with compressed _______ or _______.
Air
Nitrogen
Three types of accumulators used in aircraft hydraulic systems are:
Piston Type
Bladder Type
Diaphragm Type
High pressure valve cores are identified by the letter _______ embossed on the end of their stem.
H
Hydraulic actuators which produce straight-line movement are known as ______ actuators.
Linear
If a continuous rotational force is needed, a hydraulic ______ may be used.
Motor
A chevron seal is a _______ (one-way or two-way) seal.
One-way
An O-ring is a ________ (one-way or two-way) seal.
Two-way
An O-ring should have a width of approximately 10% ________ (larger or smaller) than the width of the groove into which it fits.
Larger
A _______ _______ should be used with an O-ring whenever the operating pressure exceeds about _____ psi.
Backup ring, 1500
The ______ date is the date of O-ring manufacture.
Cure
An O-ring marked with a blue dot _____ (would or would not) be compatible with MIL-H-5606 hydraulic fluid.
Would
When installing O-rings, extreme care must be used to prevent the ring from being ______ or ______ by sharp edges.
Nicked
Damaged
