18.
Operating an engine on an overly rich mixture can cause:
a. Either or both conditions in items “A” and “C” (loss of power and afterfiring, loss
of power and backfiring)
19. While running an engine you observed that it operated all right at idle, but
that at cruise and full throttle the engine was losing power and the engine would
backfire. The reason could be that the:
a. Main metering system is partially restricted
a. An engin Major overhaul
16. While setting the idle mixture, you hear a high pitched whistling sound and
you are unable to enrich mixture sufficiently. What would this most likely
indicate?
17. A conventional fixed-wing aircraft flight control systemconsists of flight
control surfaces, the respective cockpit controls, connecting linkages, and the
necessary operating mechanisms to control an aircraft's direction in flight. Aircraft
engine controls are also considered as flight controls as they change speed.
18. The fundamentals of aircraft controls are explained in flight dynamics. This
article centers on the operating mechanisms of the flight controls. The basic
system in use on aircraft first appeared in a readily recognizable form as early as
April 1908, on Louis Blériot's Blériot VIII pioneer-era monoplane design.[1]
a. There is a small intake leak in the induction system
17. On an updraft carburetor installation, if fuel were seen dripping from the
carburetor heat box of the induction air inlet when engine is shut down, it would
most likely be caused by:
a. A poorly seated float valve
19. Operating an engine on an overly rich mixture can cause:
a. Either or both conditions in items “A” and “C” (loss of power and afterfiring, loss
of power and backfiring)
20. While running an engine you observed that it operated all right at idle, but
that at cruise and full throttle the engine was losing power and the engine would
backfire. The reason could be that the:
a. Main metering system is partially restricted
20. An engine cruising at altitude with a back-suction mixture control
continues to run rich even though it has been leaned out. The probable cause is:
a. A leak at the bowl parting surface
21. Assuming no ice has formed in the carburetor, which of the following
indications…..didn’t get the whole question, study guide says “what tach would
read with fixed pitch prop & carb heat on”
a. Rpm decrease of approximately 50-100
22. In an engine with a fixed pitch propeller, you would detect carburetor icing
by noting:
a. A decrease in both MAP and RPM
23. Brake specific fuel consumption is:
a. Expressed as in “A” and computed as in “C” (pounds of fuel used per hour for
each brake horsepower, brake horsepower divided by pounds of fuel burned per hour)
24. The throttle valve (fixed pitch propeller):
a. Does the mentioned in both “A” and “C” (controls manifold pressure which affects
engine speed, controls rpm which affects manifold pressure)
25. Most carburetors with an automatic mixture control changes fuel flow by:
a. Using a variable orifice main metering jet
26. When setting the idle mixture, the mechanic notes that the RPM falls off
steadily when the mixture control is placed in idle cutoff. This indicates the idle
mixture is
a. Slightly lean
27. In addition to the primary flight controls for roll, pitch, and yaw, there are
often secondary controls available to give the pilot finer control over flight or to
ease the workload. The most commonly available control is a wheel or other
device to control elevator trim, so that the pilot does not have to maintain
constant backward or forward pressure to hold a specific pitch attitude[4] (other
types of trim, for rudder and ailerons, are common on larger aircraft but may also
appear on smaller ones). Many aircraft have wing flaps, controlled by a switch or
a mechanical lever or in some cases are fully automatic by computer control,
which alter the shape of the wing for improved control at the slower speeds used
for take-off and landing. Other secondary flight control systems may be available,
including slats, spoilers, air brakes and variable-sweep wings.
27. Fuel/air ratios are expressed:
a. In weight (pounds)
28. Which of the items below are done at the 100 hour inspection?:
a. clean fuel screens
21. e cruising at altitude with a back-suction mixture control continues to run
rich even though it has been leaned out. The probable cause is:
a. A leak at the bowl parting surface
pulleys, counterweights, and sometimes chains to transmit the forces applied to the
cockpit controls directly to the control surfaces. Turnbuckles are often used to adjust
control cable tension. The Cessna Skyhawk is a typical example of an aircraft that uses
this type of system. Gust locks are often used on p
arked aircraft with mechanical systems to protect the control surfaces and linkages from
damage from wind. Some aircraft have gust locks fitted as part of the control system.[6]
Increases in the control surface area required by large aircraft or higher loads caused
by high airspeeds in small aircraft lead to a large increase in the forces needed to move
them, consequently complicated mechanical gearing arrangements were developed to
extract maximum mechanical advantage in order to reduce the forces required from the
pilots.[7] This arrangement can be found on bigger or higher
performance propeller aircraft such as the Fokker 50.
Some mechanical flight control systems use servo tabs that provide aerodynamic
assistance. Servo tabs are small surfaces hinged to the control surfaces. The flight
control mechanisms move these tabs, aerodynamic forces in turn move, or assist the
movement of the control surfaces reducing the amount of mechanical forces needed.
This arrangement was used in early piston-engined transport aircraft and in early jet
transports.[8]The Boeing 737 incorporates a system, whereby in the unlikely event of
total hydraulic system failure, it automatically and seamlessly reverts to being controlled
via servo-tab.
22. Assuming no ice has formed in the carburetor, which of the following
indications…..didn’t get the whole question, study guide says “what tach would
read with fixed pitch prop & carb heat on”
a. Rpm decrease of approximately 50-100
23. In an engine with a fixed pitch propeller, you would detect carburetor icing
by noting:
a. A decrease in both MAP and RPM
24. Brake specific fuel consumption is:
a. Expressed as in “A” and computed as in “C” (pounds of fuel used per hour for
each brake horsepower, brake horsepower divided by pounds of fuel burned per hour)
