Aircraft Systems 2 Flashcards
When you turn the ignition OFF and engine continues to run. is this normal?
No. should not happen. Most likely the ground wire is disconnected or broken.
What happens is the ground wire is broken or disconnected?
Engine could start with he residual fuel
If the engine Strats with residual fuel, how can you shut it off?
mixture level to idle cut off
Leaving the carburetor on during the talk off will
increase the ground roll. Because the air going into the mixture is less dense.
When carburetor is iced, what will happen next?
1) Apply the carburetor heat
2) RPM will be reduced and increased as the ice melts.
3) If there is no ice, RPM will drop and remain constant.
How can you detect if the magneto is broken or not?
idle the engine and momentarily turn the ignition off
Fouling of spurs plugs is more apt to occur if the aircraft
climbing into less dense air without adjustment of mixture setting
When you climb, how come do you have richer mixture?
High altitude, air becomes less dense
What is constant speed propeller?
Pitch of the blades are varied by a governor to maintain constant RPM
What type of the propeller is the most efficient?
Constant speed propeller
What are the two controls for the constant speed propellers?
1) throttle
2) Propeller control
What the are jobs of the
1) throttle
2) Propeller control
for the constant speed propeller?
Throttle controls the power output
Propellers controls the engine RPM
ONCE a SPECIFIC RPM IS SELECTED, A GOVERNOR AUTOMATICALLY ADJUSTS THE PROPELLER BLADE
For the constant speed propellers, step to prevent stress on the engine
decrease the manifold pressure before decreasing RPM
For any given RPM, there is a _______________ that should not be exceeded.
Manifold Pressure
What is the order when you want to make power adjustments?
1) When power is decreased, reduce the manifold pressure before reducing the RPM
2) When power is increase, reverse the order. increase the RPM first and then manifold pressure
When does the detonation may occur at high-power settings ?
the fuel mixture ignites instantaneously instead of boring progressively and evenly
Detonation can be caused by
using a lower grade of fuel than recommended
The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as
preignition
Fuel/air ratio is the ratio between the
weight of fuel and weight of air entering the cylinder.
The mixture control sac be adjusted which
prevent the fuel/air combination from becoming too rich at higher altitudes
Propeller efficiency is the
ratio of thrust horsepower to brake horsepower
A fixed-pitch propeller is designed for best efficiency only at a given combination of
airspeed and RPM.
The main reason for the variations in geometric pitch (twisting) along a propeller blade is to
produce uniform lift from the hub to the tip
A detuning of engine crankshaft counterweights is a source of over stress that may be caused by
rapid opening and closing of the throttle
The Best power mixture is that fuel/air ratio at which
the most power can be obtained for any given throttle setting
What effect, if any, would a change in ambient temperature or air density have on gas turbine
engine performance?
As temperature increase s, thrust decreases
Applying carburetor heat will
enrich the fuel/air mixture
High oil temperature that exceeds normal operating limits could indicate
Low oil quantity
What will occur if no leaning is made with the mixture control as the flight altitude increases
The density of air entering the carburetor decreases and the amount of fuel remains constant
Unless adjusted, the fuel/air mixture becomes richer with an increase in altitude because the amount fuel?
Remains constant while the density of air decreases
If you fail to adjust to the proper fuel-air mixture In an aircraft powered by a normally aspirated engine, after climb to a higher altitude, the result is
An excessive fuel flow that fails to compensate for decreased air density
At high altitude, an excessively rich mixture will cause the
Fouling sprak plugs
Frequent inspections should be made of aircraft exhaust manifold-type heating systems to
minimize the possibility of
exhaust gases leaking into the cockpit
To establish a climb, after take off, in an aircraft equipped with a constant-speed propeller, the output of the engine is reduced to climb power by decreasing manifold pressure and
decreasing RPM by increasing propeller blade angle.
To develop maximum power and thrust, a constant-speed propeller should be set to a blade
angle that will produce a
small angle of attack and high RPM.
For takeoff, the blade angle of a controllable-pitch propeller should be set at a
small angle of attack and high RPM.
During pre-flight in cold weather, crankcase breather lines should receive special attention
because they are susceptible to being clogged by
Ice from crankcase vapors that have condensed and subsequently frozen.
In an aircraft with a constant speed propeller, a decrease in a manifold pressure will
Cause the governor to decrease the propeller pitch to maintain engine and propeller RPM
If a pilot notices a cylinder head temperature rising above the normal limits, what are some of the
methods to lower the temperature to normal operating limits?
Increase airspeed, enrich fuel/air mixture, and/or reduce engine speed
