Engines Flashcards
The oil level being too low will cause what?
Abnormally high engine oil temperature indication.
What will excessively high engine temperatures cause?
Loss of power, excessive oil consumption, and possible permanent internal engine damage.
For internal cooling, air cooled engines are dependent on what?
The circulation of lubricating oil.
If the engine oil temperature and cylinder head temperature gauges have exceeded their normal operating range, the pilot may have been operating with what?
Too much power and with the mixture set too lean.
What can a pilot do 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?
Enrich the fuel mixture.
How is engine operation controlled on an engine with a constant speed propeller?
The throttle controls power output as registered on the manifold pressure gauge and the propeller control regulates engine RPM.
What is a precaution for the operation of an engine equipped with a constant speed propeller?
Avoid high manifold pressure settings with low RPM.
What is an advantage of a constant speed propeller?
Permits the pilot to select the blade angle for the most efficient performance.
What is one purpose of the dual ignition system on an aircraft engine?
Improved engine performance.
If the ignition switch ground wire becomes disconnected what may happen?
The magneto may continue to fire.
Float type carburetor systems compared to fuel injection systems are..
..more susceptible to icing.
Which condition is most favorable to the development of carburetor icing?
Temperature between 20 and 70 degrees F and high humidity.
The possibility of carburetor icing exists even when ambient air is how high?
As high as 70 degrees 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 be what?
Decrease of RPM.
What is the operating principle of float type carburetors based on?
The difference in air pressure at the venturi throat and the air inlet.
The presence of carburetor ice in an aircraft equipped with a fixed pitch propeller can be verified by applying carburetor heat and noticing what?
A decrease in RPM and then a gradual increase in RPM.
What does the use of carburetor heat do?
Decrease engine performance.
Applying carburetor heat will do what?
Enrich the fuel/air mixture.
What change occurs in the fuel/air mixture when carburetor heat is applied?
The fuel/air mixture becomes richer.
During the run up t a high elevation airport, a pilot notes a slightly engine roughness that is not affected by the magneto check bur grows worse during the carburetor heat check. under these circumstances, what would be the most logical initial action?
Check the results with a leaner setting of the mixture.
What is the basic purpose of adjusting the fuel/air mixture at altitude?
To decrease the fuel blow in order to compensate for decreased air density.
While cruising at 10,000 feet MSL, the fuel/air mixture is properly adjusted. What will occur if a descent to 4,500 ft MSL is made without readjusting the mixture?
The fuel/air mixture may become too lean.
What is fuel/air ratio?
the weight of fuel and weight of air entering the cylinder.
When does detonation occur in a reciprocating aircraft engine?
The unburned charge in the cylinders explores instead of burning normally.
IF a pilot suspects that the engine (with a fixed pitch propeller) is detonating during climb out after takeoff, what should the pilot do?
Lower the nose slightly to increase airspeed.
If the grade of fuel used in an aircraft engine is lower than specified for the engine, what will it cause?
Detonation.
What is pre-ignition?
The uncontrolled firing of the fuel/air charge in advance of normal spark ignition.
If the recommended octane is not available what type of fuel can be substituted?
The dexter higher octane aviation gas.
Filling the fuel tanks after the last flight of the day does what?
Prevents moisture condensation by eliminating airspace in the tanks.
To purge water from the fuel system of an aircraft with fuel tank sumps and a fuel strainer quick drain, where do you drain fuel from?
The fuel strainer drain and the fuel tank sumps.
On aircraft equipped with fuel pumps, when is the auxiliary electric driven pump used?
In the event engine driven fuel pump fails.
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 should be the first action after starting an aircraft engine?
Adjust for proper RPM and check for desired indications on the engine gauges.
When handstarting airplane engines who should be at controls?
A competent pilot should be at the controls in the cockpit.
During preflight in cold weather, crankcase breather lines should receive special attention because they can become clogged by what?
Ice from crankcase vapors that have condensed and frozen.
