Q1-14.
Gasoline evaporates at which of the following
A good antifreeze solution mixes readily with
temperatures?
water. Ethylene glycol (antifreeze compound) has an
extremely high boiling point, is non-corrosive, has no
1.
Any temperature
odor, does not evaporate in use, and gives complete
2.
Only below 32F
protection against freezing in normal use. It gives a
3.
Only above 32F
maximum protection against freezing to 65 F when
4.
Only above 212F
mixed to a solution of 60-percent solution with
Q1-15.
Which of the following properties will a
40-percent water. Once mixed, the solution penetrates
manufacturer consider in specifying a fuel for
openings and connections more readily than plain
a diesel engine?
water. Before the first filling of antifreeze and
periodically thereafter, you should check the hoses for
1.
Antiknock only
leaks. Most antifreeze compounds contain a rust and
2.
Viscosity only
corrosion inhibitor. Without an inhibitor, rust and
3.
Volatility only
corrosion form in radiators, causing water-cooled
4.
Antiknock, viscosity, and volatility
engines to overheat.
Q1-16.
Which of the following is NOT a reason for
NOTE: If the proportions of ethylene glycol are
aviation fuels being more useful than diesel
raised in the solution, it will result in a higher freezing
fuels in support equipment?
point for the solution, consequently giving less protec-
1.
Fewer pollutants
tion. If 100-percent ethylene glycol were used, its
2.
Lower cost per gallon
freezing point would not be much below that of water.
3.
Increased engine life
All antifreeze solutions require periodic checks and
4.
Greater availability aboard ships and sta-
must be replenished when tests show that they do not
tions
give the required protection against freezing.
Hydrometers are used for such testing. (A hydrometer
Q1-17.
What happens if you mix petroleum-based or
is an instrument used for determining the specific
mineral-based
hydraulic
fluid
with
gravity of a liquid.)
synthetic-based brake fluid?
Antifreeze solutions (even permanent types) are
1. It forms a jelly-type substance
not recommended for use beyond one season.
2. It forms a reddish brown tar-like sub-
Furthermore, it is recommended that different types of
stance
antifreeze solutions not be mixed. When two types of
3. It forms an acidic substance
solutions are mixed, there is no way of knowing the
4. It forms a solid substance
temperature at which the mixed solutions freeze. Also,
their ingredients may react chemically, causing
Q1-18.
What instrument is used for testing the
restrictions in the cooling system.
specific gravity of antifreeze solutions in
support equipment?
Q1-12.
You need complete details for a specific type
or model of aviation support equipment. You
1.
should use which of the following sources?
2.
Specific gravity meter
3.
Hydrometer
1. NA 17-1-125
4.
Antifreeze test kit
2. Maintenance Instruction Manual (MIM)
only
3. Maintenance Requirements Card (MRC)
CORROSION CONTROL
only
LEARNING OBJECTIVES: Identify the
4. Maintenance Instruction Manual and
causes of corrosion control. Identify proce-
Maintenance Requirements Card
dures for corrosion control prevention. Identify
Q1-13.
What are the primary causes of premature
corrosion control publications applicable to
engine failures in support equipment?
support equipment. Identify minimum require-
ments for corrosion control training.
1.
Improper preoperational inspections
2.
Water in the oil
The reliability and effectiveness of support
3.
Dirt and water in fuels
equipment depend largely upon the structural
4.
Misuse/abuse by operator
soundness of the metals that make up their many parts.
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