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WorksheetsAirframe
Total questions: 125
Worksheet time: 1hrs 3mins
A fuel cross-feed valve is usually in
A. the closed position.
B. the open position.
C. its last position.
D. on position.
The primary purpose of an aircraft's fuel jettison system is to quickly achieve a:
lower landing weight.
balanced fuel load.
reduced fire hazard.
all of above.
Integral tanks are
cavities within the aircraft’s airframe itself
external tanks needs to be fabricated.
external tanks required to put in the airframe
there is no such type of fuel tank.
When refueling
the fuel nozzle will automatically cut off the supply when the tank is full
the fuel nozzle will manually cut off by pilot.
it is important to fill the expansion space in the tank
it is important not to fill the expansion space in the tank
Microbial growth is.
red dots
brown black slime
green sludge
yellow dots
A zero fuel test on a fuel quantity indicating system is carried out with.
tanks completely full.
tanks with unusable fuel
tanks empty apart from unusable fuel.
tanks completely empty.
On large transport aircraft fuel is delivered to each engine using
a parallel system.
a series system.
a separate system for each engine.
the same system for each engine.
In biologically contaminated fuel, corrosion takes place
below the fungal colonies.
the top of the tank.
the bottom 2 inches of the tank.
the side of the tank.
Cross feed valves permit fuel transfer from
tank to tank.
left tank to right tank.
any tank to any engine
none all above
The purpose of a scavenge system within a fuel system is
to ensure that all unused fuel is returned to the tanks efficiently.
To prevent water flows to fuel tank
to ensure that any water in the fuel is constantly dispersed thus reducing microbiological contamination.
to ensure that all available fuel can be used
To shut-off the LP fuel supply to the engine for the purpose of engine removal you would.
close the cross-bleed valve.
close the HP fuel lock.
Emergency shut off
pull the fire handle.
The advantages of integral fuel tanks are that they.
are safer on fire hazard compare to others
use the maximum volume for fuel and have the minimum amount of weight.
are easier to design and construct and use the maximum volume of fuel.
are cheaper to manufacture, more durable and easier to maintain.
In a light fixed wing aircraft, the fuel warning light indicates
pump failure.
the tank does not pressurized.
Fuel is lower than normal level
ice blockage, filter popped or pump fail.
A fuel cross-feed valve is lubricated.
by internal cooling.
. by air
by the fuel
by lubricant.
A fuel tank suction valve will open when.
the booster pump fails.
either the engine driven pump fails or booster pump fails.
the engine driven pump fails.
both the engine driven and booster pump fails
A shroud vent and overload drain would normally be found on.
engine cross feed system
fuel jettison system.
fuel tank vent pipes.
the APU fuel feed
A check valve is fitted to a fuel jettison system to.
prevent the center from being defueled.
prevent the dumping of the outer tanks.
automatically stop the fuel jettison operation after a period of time
prevent fuel back pressure
The purpose of control cable regulators is to
maintain flight level.
maintain preset cable tensions during flight.
compensate for low temperature only.
compensate for high temperature only.
A yaw damper gain could be fitted with.
decreases sensitivity for decreased speed.
increased sensitivity for increased speed.
decreases sensitivity for increased speed.
increased sensitivity for decreased speed
With respect to flight spoilers, they.
can operate both on the ground and in flight.
only emergency situation
only operated on the ground
only operated in flight
In a fly-by-wire aircraft, what controls the roll spoilers?
Flight control computer.
Flight augmentation computer.
Air data computer
Flight management computer.
What is an aileron balance cable for?
To allow the cable to be tensioned.
To correct for wing heaviness.
To allow aircraft to fly hands off.
To correct for balancing aircraft.
A horn balance on a control will.
increase degree of movement at high speed
decrease degree of movement at low speed.
decrease degree of movement at high speed
increase degree of movement at low speed.
Active load control uses.
elevator and aileron.
slat and aileron.
aileron and spoiler.
elevator and stab.
Differential aileron control will.
cause difficult to control
cause a nose up moment.
prevent yawing in conjunction with rudder input.
cause a nose down moment.
On a fly-by-wire aircraft, what controls stabilizer trim?
SEC.
ELAC and SEC.
ELAC
LEC
How is the stabiliser automatically controlled in normal manual operation?
Mach/Speed Trim.
Pitch Trim
Electric Trim
Hydraulic Trim.
. In an aircraft system employing balance tabs, the installation of external ground locks between control surface and balance tabs.
would prevent the movement of the control column.
is unnecessary since the system is irreversible.
would not prevent the movement of the control column.
none all above.
What is used to correct any tendency of the aircraft to move towards an undesirable flight attitude?
Trim tabs.
Spring tabs.Balance tabs.
Balance tabs.
Trim tabs and Spring tabs.
In a fly-by-wire control system, the follow-up transducer is fitted to.
the pilots input.
the hydraulic actuator.
the electric system.
the control system computer
A stick shaker is a device which
gives a short period of landing
helps extricate an aircraft from soft ground.
gives a short period of extra lift to assist take off.
vibrates the control column near stalling speed.
The purpose of the servo valve in a power operated control is
to provide pressure to operate the control
to direct hydraulic fluid to the jack in response to the pilots control in cockpit.
to revert the system to manual operation.
A and C is correct
Differential aileron control will.
cause difficult to control
cause a nose up moment.
prevent yawing in conjunction with rudder input
cause a nose down moment.
A servo tab is operated.
indirectly by the pilot to produce forces which in turn move the main control surfaces.
by a trim wheel and moves in the opposite direction to the main control surfaces when moved.
automatically, and moves in the same direction as the main control surfaces.
directly by the pilot to produce forces which in turn move the main control surfaces.
What type of packing’s should be used in hydraulic components to be installed in a system containing Skydrol?
Packing materials made for ester base fluids
AN packing’s made of natural rubber.
AN packing’s made of neoprene.
If a hydraulic brake system uses neoprene rubber packing materials, the correct hydraulic fluid to service the system is
mineral base oil.
synthetic base oil.
phosphate ester base oil.
The internal resistance of a fluid which tends to prevent it from flowing is called
volatility.
viscosity.
acidity.
What is the viscosity of hydraulic fluid?
The increase in volume of a fluid due to temperature change.
The fluid's ability to resist oxidation and deterioration for long periods.
The internal resistance of a fluid which tends to prevent it from flowing.
Which is a characteristic of petroleum base hydraulic fluid?
Flammable under normal conditions.
Compatible to natural rubber seals and packings.
Nonflammable under all conditions.
What is the main purpose of a pressurized reservoir in a hydraulic system?
Prevent hydraulic pump cavitation.
Prevent hydraulic fluid from foaming.
Prevent tank collapse at altitude.
Which is a characteristic of phosphate ester base hydraulic fluid?
Low moisture retention
High flash point.
Low moisture retention.
Two types of hydraulic fluids currently being used in civil aircraft are
Mineral base, and phosphate ester base.
Mixed mineral base and phosphate ester base
Petroleum base and mixed mineral base.
Which of the following lists only desirable properties of a good hydraulic fluid that has chemical stability?
High viscosity, low flash point, high fire point.
High flash point, low viscosity, low fire point.
Low viscosity, high flash point, high fire point.
Characteristics of MIL-H-8446 (Skydrol 500 A & B) hydraulic fluid are
blue color, phosphate ester base, fire resistant, butyl rubber seals.
light purple color, phosphate ester base, fire resistant, butyl rubber seals.
light green color, phosphate ester base, fire resistant, butyl rubber seals.
Phosphate ester base hydraulic fluid is very susceptible to contamination from
ethylene propylene elastomers.
Teflon seal material.
water in the atmosphere.
Petroleum base hydraulic fluid is which color?
Purple.
Red.
Blue.
In brake service work, the term “bleeding brake” is the process of.
replacing small amounts of fluid in reservoir
withdrawing air only from the system.
withdrawing fluid from the system for the purpose of removing air that has entered the system
When bleeding aircraft brakes, one of the indications that the air has been purged from the system is.
full brake pedal travel.
partial brake pedal travel.
firm brake pedals
Pressure source for power brake
the main hydraulic system.
the main hydraulic system.
the power brake reservoir.
What should be check when a shock strut bottoms during a landing?
Fluid level
Air pressure.
Packing seals for correct installation.
Excluding line, which components are required to make up a simple hydraulic system?
Pump, reservoir, relief valve, and shuttle valve.
Actuator, pressure reservoir, accumulator, and selector valve.
Pump, reservoir, selector valve, and actuator.
The primary purpose for balancing aircraft wheel assemblies is to
prevent heavy spots and reduce vibration.
reduce excessive wear and turbulence.
distribute the aircraft weight properly
What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?
Limit compression stroke
Maintain correct wheel alignment.
Hold the strut in place
The purpose of sequence valve in a hydraulic retractable landing gear system is to
prevent heavy landing gear from falling too rapidly upon extension.
. provide a means of disconnecting the normal source of hydraulic power and connecting the emergency source of power.
ensure operation of the landing gear and gear doors in the proper order.
What type of valve use brake actuating line to isolate emergency brake system
A shuttle valve
A bypass valve.
An orifice check valve.
Many hydraulic reservoirs contain a small quantity of fluid which is not available to the main system pump. This fluids retained to
supply fluid to the auxiliary pump
prime the main system.
supply fluid to the pressure accumulator
A strip or mark applied to a wheel rim and extending on to sidewall of tube type tire is.
. wheel weight reference mark.
wheel-to-tire balance mark.
slippage mark.
A hydraulic accumulator is charged of 1,000 psi. when a hydraulic system pressure of 2,800 psi is developed, the pressure on the air side of the accumulator will be.
4,000 PSI.
3,000 PSI.
2,800 PSI.
1,000 PSI.
Which seal/material is used with phosphate ester base hydraulic fluid?
. Silicone rubber.
Neoprene rubber.
Butyl rubber
A common cause of slow actuation of hydraulic components is
restricted orifices.
internal leakage in the actuating unit.
cold fluid.
high viscosity.
The purpose of a relief valve in a brake system is to.
prevent the tire from skidding.
reduce pressure for brake application.
compensated for thermal expansion.
Excessive wear in the shoulder area of an aircraft type is an indication of.
excessive toe in
underinflation.
overinflation.
What is the function of a cam incorporated in a nose gear shock strut?
Provides steering of aircraft during ground operation.
Straightens the nosewheel.
Provides an internal shimmy damper.
Internal leakage in a brake master cylinder unit can cause
the pedal to slowly creep down while pedal pressure is applied.
fading brakes
slow release of brakes.
How can it be determined that all air has been purged from a master cylinder brake system?
By noting whether the brake is firm or spongy.
By noting the amount of fluid return to the master cylinder upon brake release.
By operating a hydraulic unit and watching the system pressure gauge for smooth, fullscaledeflection
A landing gear position and warning system will provide a warning in the cockpit when the throttle is
. advanced and gear is down and locked.
advanced and gear is down and unlocked.
retarded and gear is down and locked.
retarded and gear is not down and locked.
What are the 3 pressurization terms?
-Cabin altitude
-Cabin differential pressure
-Cabin rate of climb
Usually there are three cockpit indications for pressurization systems?
The cabin altimeter
-cabin rate of climb or vertical speed indicator
cabin differential pressure indicator
Which of these is not a consequence of cross-contamination of vapor cycle refrigerants?
Reduced performance
Increased operating costs due to separation and purification
Fines from the EPA
Lubrication problems
A system incorporating a compressor/expansion turbine unit is called a/an:
Bootstrap system
Closed air-cycle system
Heat exchanger system
Open air-cycle system
Which of these cabin pressurization system checks tests the structural integrity of the fuselage?
Cabin static pressure test
Cabin pressure dynamic pressure test
Low-stage bleed port test
Pressure regulator operation test
Preventing over-pressurization and subsequent damage to the aircraft structure is the job of the:
Pressurization safety valve
Cabin pressure dump valve
Air exchanger
Outflow valve
Cabin air temperature sensors that provide resistance that varies inversely with heat are called:
Wheatstone bridges
Thermisters
Anticipators
Temperature limiting
A negative pressure relief valve is included on pressurized aircraft to ensure ?
that air pressure outside the aircraft does not exceed cabin air pressure
-
Pressurization safety valves are used to prevent?
the over pressurization of the aircraft cabin
-
hot compressor produce bleed air … supply cold air by
Dual evaporator / vapor cycle
-
A cold air unit produces a drop in temperature by.
expanding hot air across a turbine which is driving a compressor.
directing compressed air into a heat exchanger.
air supply to the cabin.
Purpose mixing bleed air
Regulated temperature
-
Freon give up heat change vapor to liquid
Condenser
-
A malfunction in a Freon system called slugging occurs when:
The thermostatic expansion valve does not have enough refrigerant
The thermostatic expansion valve has too much refrigerant
. Liquid refrigerant enters the compressor
Heat is removed from the Freon in the condenser, condensing it to a liquid
Combustion heater control by thermostat circuit which
Thermostat cycling switch
-
What ventilating air use on of combustion heater
Electrical driven blower
-
Definition of Cabin differential pressure ?
The difference between the air pressure inside the cabin and the air pressure outside the cabin. Cabin pressure(psi): ambient pressure (psi) = cabin differential pressure(psid or A psi)
-
Aircraft cabin pressurization can be controlled by which two modes of operation?
The first is the isobaric mode -The second mode of pressurization control is the constant differential mode
-
Aircraft cabin pressurization can be controlled?
via two different modes of operation
-
Negative relief valves
Open to prevent negative differential pressure when outside pressure exceeds that inside the aircraft by a predetermined amount.
-
A squib, as used in a fire-protection system, is a
device for causing the fire-extinguishing agent to be released
-
On a periodic check of fire-extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?
Replace the extinguisher container.
-
What method is used to detect the thermal discharge of a built-in fire-extinguisher system?
A rupture of the red plastic disk in the thermal discharge line
-
HFCs
Fluorine+Hydrogen
-
Thermal switch system use
A bimetallic thermostat switches
-
A fire-extinguisher container can be checked to determine its charge by
weighing the container and its contents.
-
Built-in aircraft fire-extinguishing systems are ordinarily charged with
halogenated hydrocarbons and nitrogen
-
A thermocouple in a fire-detection system causes the warning system to operate because
it generates a small current when heated.
-
The most common cause of false fire warnings in continuous-loop-fire-detection systems is
dents, kinks, or crushed sensor sections.
-
Which of these can happen if an oxygen cylinder valve is opened too quickly?
The oxygen cylinder can become a projectile
The regulator diaphragm can rupture allowing high pressure gas to escape
The cylinder is rendered useless
The valve is destroyed and must be replaced before using the cylinder
Which of these components of a Freon system is supported by all of the other components in the system, and is where the actual cooling is done?
Evaporator
Condenser
Receiver
Compressor
Which of these components of a Freon system senses evaporator conditions and meters refrigerant to satisfy them?
Receiver
Evaporator
Expansion valve
Surge valve and temperature controls
Which of these maintains the cabin pressure in a pressurized fuselage?
Cabin pressure dump valve
Pressurization safety valve
Outflow valve
. Air exchanger
. Oxygen content and atmospheric pressure remain high enough to maintain almost full saturation of the blood with oxygen, ensuring normal body and mental functions, up to what altitude?
10,000 feet above sea level
7,000 feet above sea level.
15,000 feet above sea level.
One mile above sea level.
In the event of failure of the fixed oxygen systems, portable oxygen systems are used primarily to maintain:
Cabin pressure
Passenger comfort and safet
Crew functions
Cabin oxygen levels
At what altitude will unconsciousness likely occur without an oxygen supply and where blood oxygen saturation is down to 50-55 percent?
25,000 feet above sea level.
15,000 feet above sea level.
Two miles above sea level.
10,000 feet above sea level.
Regarding the marking on an oxygen cylinder after manufacture, the plus-rating indicates that the cylinder.
Meets the requirements for a 10-year retest.
Has been hydrostatically tested.
Mustbe retired after 4,380 fillings.
Qualifies for a 10% overfill rating.
Regarding oxygen breathing regulators, A&P technicians are responsible for.
. Remove and installation.
Component maintenance.
. Training on pressure-demand regulators.
Adjusting the pressure as the altitude changes.
The success or failure of high-altitude flight depends primarily on the proper functioning of which component, referred to as the heart of the oxygen system?
Oxygen mask
Distribution line
Oxygen system check valve
Oxygen breathing regulator
The pneumatic system pump is a.
Centrifugal type
rotor valve type
Piston type
Two compressors driven by separate engines use
Interconnected to share loads
NRVs to prevent compressors driving each other
PRVs
Prevent excessive pneumatic
PRV
OPV
HPV
Check valve
Not interface of pneumatic system?
APU
Wing, tail, anti-icing
Engine, APU extinguisher
Brake
Type detector, fixable metallic use?
Leak by thermal switch
Leak by failure loop
Leak by pressure switch
Leak by bimetallic switch
Low stage pressure 36 psi, what component actuate?
PRV
OPV
HPV
TLT
Not main component of pneumatic system
APU
-
Drinking water pipes are prevented from freezing by
Installation of neoprene foam insulation
Wrapping the pipes with heated tapes or ribbons
Placing the pipes adjacent to hot water piping
A toilet recirculation fan is unserviceable in flight.
Close toilet until landing
You can use the toilet as the toxic chemical toilet
It can be overcome by thermal compensating device.
Toilet flush motor is protected from overheat by
Thermal protection
Water cooling
Cooling fanon timer switch
What is differential pressure, why is it important to understand this concept? If we have a greater differential pressure is the difference between cabin altitude and actual altitude greater or less?
The ratio of cabin pressure to outside air pressure is called cabin differential pressure - greater
-
What purposes does the outflow valve serve?
hat purposes does the outflow valve serve? The primary means of regulating cabin pressure It opens, closes, or modulates to maintain a desired cabin altitude, cabin differential pressure, and cabin rate of climb or descent.
-
How is the cabin pressure of a pressurized aircraft usually controlled?
by a pressure sensitive switch that causes the pressurization pump to turn on or off as required
by an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set
by a pressure sensitive valve that controls the output pressure of the pressurization pump.
The purpose of the dump valve in a pressurized aircraft I to relieve
all positive pressure from the cabin
a negative pressure differential
pressure in excess of the maximum differential
Automatic temperature control of the system as shown would be accomplished by
The temperature selector in conjunction with cabin sensors and the temperature regulator modulating the mixed valve
-
How are the detector units in a double loop Fenwal system wired?
In parallel between two complete loops of wiring
-
Are thermal switches wired in series or in parallel with each other?
Parallel
-
*Which of these types of damage to a combustion heater can be repaired?
Deformation due to overheating
Small fatigue cracks
Soft and spongy metal due to overheating
Deformation due to backfiring, but causing less than a 10 percent drop in ventilating air pressure
hen used in fire-detection systems having a single indicator light, thermal switches are wired in
parallel with each other and in series with the light.
-
A thermocouple in a fire-detection system causes the warning system to operate because
it generates a small current when heated.
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