4-58.
The fuselage of the H-60 helicopter is of what
type of construction?
1.
Graphite monocoque
2.
All–metal semimonocoque
3.
Reinforced carbon shell
4.
Welded steel truss
4-59.
What type of main landing gear is mounted on
the H–60 helicopter?
1.
Retractable
2.
Fixed–skid type
3.
Nonretractable
4.
Conventional fixed
4-60.
What assembly provides attachment of the
main rotor blade to the rotor hub?
1.
Cuff
2.
Spar
3.
Root end
4.
Tip cap
4-61.
The hub and swashplate of a helicopter are the
principal components of what unit(s)?
1.
Tail rotor
2.
Droop restrainers
3.
Rotary head
4.
Antiflapping restrainers
4-62.
The movements of the flight controls are
transmitted to the rotary wing by the action of
what components?
1.
Hinges and rotating scissors
2.
Sleeve
spindles
and
antiflapping
restrainers
3.
Damper positioners and stationary scissors
4.
Hydraulic servo cylinders, swashplate, and
pitch control rods
4-63.
Change in rotary rudder head pitch is increased
as the pitch change shaft is moved in what
direction?
1.
Up
2.
Down
3.
Inward
4.
Outward
4-64.
The efficiency of hydraulic operation is
approximately what percent?
1.
100%
2.
95%
3.
85%
4.
75%
4-65.
Which of the following is a disadvantage of the
hydraulic system as a power source for aircraft
control units?
1.
Extensive maintenance requirements
2.
Possibility of internal and external leakage
3.
Loss of efficiency due to friction
4.
Heavy weight
IN ANSWERING QUESTIONS 4-66 THROUGH
4-68, REFER TO FIGURE 4-22 IN THE TEXT.
4-66.
What component is often referred to as an
unloading valve?
1.
Pressure regulator
2.
Check valve
3.
Selector valve
4.
Actuating unit
4-67.
What component maintains an even pressure in
the hydraulic system and acts as an emergency
source for operating certain actuating units?
1.
Power pump
2.
Accumulator
3.
Pressure gauge
4.
Selector valve
4-68.
Check valves are used in a hydraulic system for
what purpose?
1.
To bleed off pressure
2.
To stop the flow of fluid
3.
To allow one direction of flow only
4.
To bypass filter element
4-69.
Foreign material in the hydraulic system of an
aircraft is defined as hydraulic contamination.
1.
True
2.
False
4-70.
What
source
of
hydraulic
contamination
usually causes the most trouble?
1.
Poor servicing
2.
Self-generated
3.
Normal wear
4.
Manufactured
4-71.
Which of the following rules is/are basic to
aircraft hydraulic servicing?
1.
Never use fluid from a container that has
been left open
2.
Use only approved servicing units
3.
Always maintain a high state of cleanliness
4.
All of the above
4-27
