Aviation

Airplane Engines
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Excessively high engine temperatures will
cause loss of power, excessive oil consumption, and possible permanent internal engine damage
If the engine oil temperature and cylinder head temperature gauges have exceeded their normal operating range, the pilot may have been operating with
too much power and with the mixture set too lean.
One purpose of the dual ignition system on an aircraft engine is to provide for
improved engine performance.
The operating principle of float-type carburetors is based on the
difference in air pressure at the venturi throat and the air inlet
The basic purpose of adjusting the fuel/air mixture at altitude is to
decrease the fuel flow in order to compensate for decreased air density.
During the run-up at a high-elevation airport, a pilot notes a slight engine roughness that is not affected by the magneto check but grows worse during the carburetor heat check. Under these circumstances, what would be the most logical initial action
Check the results obtained with a leaner setting of the mixture.
While cruising at 9,500 feet MSL, the fuel/air mixture is properly adjusted. What will occur if a descent to 4,500 feet MSL is made without readjusting the mixture
The fuel/air mixture may become excessively lean
Which condition is most favorable to the development of carburetor icing
Temperature between 20 and 70 °F and high humidity
The possibility of carburetor icing exists even when the ambient air temperature is as
high as 70 °F and the relative humidity is high.
If an aircraft is equipped with a fixed-pitch propeller and a float-type carburetor, the first indication of carburetor ice would most likely be
loss of RPM.
Applying carburetor heat will
enrich the fuel/air mixture
What change occurs in the fuel/air mixture when carburetor heat is applied
The fuel/air mixture becomes richer.
Generally speaking, the use of carburetor heat tends to
decrease engine performance.
The presence of carburetor ice in an aircraft equipped with a fixed-pitch propeller can be verified by applying carburetor heat and noting
a decrease in RPM and then a gradual increase in RPM.
With regard to carburetor ice, float-type carburetor systems in comparison to fuel injection systems are generally considered to be
more susceptible to icing.
If the grade of fuel used in an aircraft engine is lower than specified for the engine, it will most likely cause
detonation.
Detonation occurs in a reciprocating aircraft engine when
the unburned charge in the cylinders explodes instead of burning normally.
If a pilot suspects that the engine (with a fixed-pitch propeller) is detonating during climb-out after takeoff, the initial corrective action to take would be to
lower the nose slightly to increase airspeed.
The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as
pre-ignition.
Which would most likely cause the cylinder head temperature and engine oil temperature gauges to exceed their normal operating ranges
Using fuel that has a lower-than-specified fuel rating.
What type fuel can be substituted for an aircraft if the recommended octane is not available
The next higher octane aviation gas.
Filling the fuel tanks after the last flight of the day is considered a good operating procedure because this will
prevent moisture condensation by eliminating airspace in the tanks.
For internal cooling, reciprocating aircraft engines are especially dependent on
the circulation of lubricating oil
An abnormally high engine oil temperature indication may be caused by
the oil level being too low.
What action can a pilot take to aid in cooling an engine that is overheating during a climb
Reduce rate of climb and increase airspeed.
What is one procedure to aid in cooling an engine that is overheating
Enrichen the fuel mixture.
How is engine operation controlled on an engine equipped with a constant-speed propeller
The throttle controls power output as registered on the manifold pressure gauge and the propeller control regulates engine RPM.
A precaution for the operation of an engine equipped with a constant-speed propeller is to
avoid high manifold pressure settings with low RPM.
What should be the first action after starting an aircraft engine
Adjust for proper RPM and check for desired indications on the engine gauges.
Should it become necessary to handprop an airplane engine, it is extremely important that a competent pilot
be at the controls in the cockpit.