Block 9
Spongy brakes are an indication of what problem in a brake system?
Air in the system
Carburetor icing is most severe at
Air temperatures between 30 and 40 F.
What are the methods used to eliminate carburetor icing in the induction system?
Alcohol spray and heated induction air
What component removes hydraulic brake pressure to the affected brake prior to skidding?
Anti Skid Control Valves.
What are the three main components of an antiskid brake control system?
Anti Skid Generator/control valve/ control box Anti Skid Control Box/ transducer/ control valve Anti Ski control box/ sensor /control valve
What brake system is used to bring an aircraft to a stop without skidding the tires?
Anti Skid system
What is the purpose of the automatic adjusters in a multiple disk brake assembly?
Compensate for disc wear, eliminates manual adjustment
The purpose of a relief valve in a brake system is to:
Compensate for thermal expansion.
On a heated windshield panel that has indications of arcing electricity, what does this usually indicate?
Conductive coating failed
Arcing in a electrically heated windshield panel usually indicated a breakdown in the
Conductive coating.
What action, if any, should be taken when there is a difference of more than 5 pounds of air pressure in tires mounted as duals?
Correct the discrepancy and enter in logbook.
The application of carburetor heat during engine operation will
Decrease the weight of the fuel/air charge.
What controls the inflation sequence in a pneumatic deicer boot system?
Distributor valve.
When bleeding aircraft brakes, one of the indications that the air has been purged from the system is:
Firm brake pedals.
Landing gear green light indicate
Gear is down and lock
An increase in manifold pressure when carburetor heat is applied indicates
Ice was forming in the carburetor.
Where are the heat sensors located on most aircraft with electrically heated windshields?
Imbedded in the glass
An embossed letter "H" on an air valve core stem:
Indicates high-pressure type
The most common type of nose wheel centering device found on large aircraft is the?
Internal Centering Cam
Why should a chemical rain repellent not be used on a dry windshield?
It will restrict visibility
What is the most important part of de-icer boot maintenance?
Keeping the boots clean
Where would the Brake Debooster cylinder be located on the aircraft?
Landing Gear Shock Strut.
A type of oil is used in an Oleo strut
MIL H 5606
Power brakes utilize hydraulic pressure from what aircraft system?
Main Hyd. System
What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?
Maintain correct wheel alignment.
What do the colors on a Bungee cord cover identify?
Manufacture date
How many brake actuating systems are used in aviation? (Source)
Mechanical , Air, and Hydraulic.
Excessive wear in the center of the tread of an aircraft tire is an indication of
Over-inflation.
List the three types of shimmy dampers:
Piston / Vane / Steering shimmy Dampers
The primary purpose for balancing aircraft wheel assemblies is to
Prevent heavy spots and reduce vibration
The purpose of an engine/inlet anti-ice system is primarily to
Prevent ice formation in engine and/or inlet areas.
Extension of an oleo shock strut is measured to determine the
Proper operating position of the strut
Carburetor icing on an engine equipped with a fix pitch propeller can be detected by a decrease in what?
RPM
The color of MIL-H-5606 fluid is
Red
What is the purpose of a Debooster in a hydraulic brake system?
Reduce the pressure to brakes / increase the volume of fluid flow.
landing gear position and warning system will provide a warning in the cockpit when the throttle is:
Retarded and gear is not down and locked
What method (s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators?n
Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine screens.
A propeller deicer system consists of the following components: Electrically heated deicers, Timer control, Ammeter to indicate operation, Wiring and switches
Slip-ring and brush block
A propeller deicer system consists of the following components: Electrically heated deicers, Timer control, Ammeter to indicate operation, Wiring and switches and ?
Slip-ring and brush block
A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube type tire is a:
Slippage mark
What is the function of a cam incorporated in a nose gear shock strut?
Straightens the nose wheel.
The correct inflation pressure for an aircraft tire can be obtained from:
The aircraft service manual.
If a wheel goes into a skid:
The braking value of the wheel is greatly reduced.
When an air / oil type of landing gear shock strut is used, the initial shock of landing is cushioned be:
The fluid being forced through a metered opening
The pressure source for power brakes is:
The main hydraulic system
Antiskid valves are located in
The normal brake system.
Why do most aircraft tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then re-inflated to the correct pressure?
To allow the tube to position itself correctly inside the tire.
What is the purpose of bleeding brakes?
To remove air
What type of Mounting anchors the oleo strut cylinder of the main gear to the aircraft structure?
Trunnion and Bracket arrangement
A truck has
Two Bogies
Aircraft brakes requiring a large volume of fluid to operate the brakes generally
Use power brake control valves
Where is the source of pressure for inflating deicer boots on reciprocating engine aircraft?
Vane-type pump or vacuum pumps
To prevent a very rapid extension of an oleo shock strut after initial compression resulting from landing impact,
Various types of valves or orifices are used which restrict the reverse fluid flow.
Over inflated aircraft tires may cause damage to the:
Wheel flange
Tail-wheel type aircraft are known to have _____________________ landing gear
conventional
Retracting the landing gear on an aircraft decreases _________________ drag
parasite
Landing gear transition light is
red
Caster is the type of nose wheel is not steerable
true
Exposure to and / or storage near which of the following is considered harmful to aircraft tires? (1) Low humidity (2) Fuel (3) Oil (4) Ozone (5) Helium (6) Electrical equipment (7) Hydraulic fluids (8) Solvents
2, 3, 4, 6, 7, 8
What indications may shift when a turbofan engine anti-icing (bleed air) system is turned on? 1. Tachometer 2. EGT 3. EPR
1, 2 and 3
Which of the following are found in a laminated integral electrically heated windshield system? 1. Autotransformer. 2. Heat control relay. 3. Heat control toggle switch. 4. 24V DC power supply. 5. Indication light.
1,2,3,5
Which of the following functions does an antiskid control system perform. 1. Normal skid control. 2. Normal braking. 3. Fail safe protection. 4. Locked wheel skid control. 5. Touchdown protection. 6. Takeoff protection.
1,3,4,5
What are three methods of anti-icing aircraft windshields? 1. Blanket-type heating system. 2. An electric heating element in the windshield. 3. Heated air circulating system. 4. Hot water system. 5. Windshield wipers and anti-icing fluid. 6. Ribbon-type heating system
2,3,5
How do deicer boots help remove ice accumulations?
By breaking up ice formations.
Most airline aircraft and wide body aircraft and almost all military aircraft use what kind of brakes ?
Carbon Brakes.
What icing condition may occur when there is no visible moisture present?
Carburetor Ice
What part of an aircraft in flight will begin to accumulate ice before any other?
Carburetor.
What type of nose wheel is not steerable?
Caster
nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to
Center the nose wheel before it enters the wheel well
Two possible sources of heat for the operation of a wing thermal anti-icing system are?
Compressor bleed air, combustion heater.
Which statement is true with respect to an aircraft equipped with hydraulically operated multi - disc brake assemblies?
Do not set parking brake when brakes are hot.
Three illuminated green lights on a King Air indicate the gear is ___________ and _________
Down and Locked
If an aircraft with an antiskid system has eight braked wheels it will have
Eight skid control generators
List two sources of power to operate a landing gear system
Electric and Hydraulic power
The antiskid control valve is an
Electrically controlled hydraulic valve
When used in General aviation aircraft, how are pitot tubes and stall warning vanes anti-iced?
Electrically heated
What brake system is available when all hydraulic systems fail?
Emergency Brake
What provides the air pressure to operate pneumatic de-ice boots
Engine driven vacuum pumps or turbine bleed air.
When an empty shock strut is filed with fluid, care should be taken to extend and compress the strut completely at least two times to:
Ensure proper packing ring seating and removal of air bubbles.
What mixture may be used as a deicing fluid to remove frost from an aircraft surface?
Ethylene glycol and isopropyl Alcohol.
What chemical mixture may be used as a deicing fluid to remove frost from an aircraft surface
Ethylene glycol and isopropyl alcohol
What early type of brake system is NOT adaptable to mechanical operation?
Expander Tube
On all aircraft equipped with retractable landing gear, some means must be provided to
Extend the landing gear if the normal operating mechanism fails
What should be checked if a shimmy damper is not functioning properly?
Fluid or oil level
What type of safety device is installed in the landing gear when it's on the ground? (Hint) They have red streamers that say "Remove Before Flight"
Ground Lock
Chines are used on some aircraft nose wheel tires to:
Help deflect water away from the fuselage.
What aural device alerts the aircraft operator when the throttles are retarded and the gear is not down and locked?
Horns or other Aural Devices provide a Warning sound to the operator.
What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice?
Hot air
The type of system does a heavy aircraft use to raise and lower the landing gear is
Hydraulically Actuated System
A weeping wing is used on the following structures or components throughout the aircraft?
Leading edges of wings, horizontal stabilizers, vertical stabilizers propellers and windscreens
A sleeve, spacer, or bumper ring is incorporated in a landing gear shock strut to:
Limit the extension stroke.
A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the?
Loss of power and possible detonation
If an aircraft shock strut (air / oil type) bottoms upon initial landing contact, but functions correctly during taxi, the most probable cause is:
Low fluid
What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?
Maintain correct wheel alignment
After performing maintenance on an aircraft's landing gear system, which may have affected the system's operation, it is usually necessary to:
Make an operational check with the aircraft on jacks.
The rubber seals used in a landing gear shock strut:
May be used only with a specific type of fluid.
The purpose of an antiskid generator is to
Measure wheel rotational speed and any changes
How does an optical ice detector operate?
Measures the thickness of ice on the wings and transmits the measurements to the pilot
If carburetor or induction icing is not present when carburetor heat is applied with no change in the throttle setting, the
Mixture will become richer.
The skid control box is usually
Mounted in the fuselage.
Where would a carburetor air heater be located in a fuel injection system?
None is required
Warning horns will sound when the throttles are retarded and the gear is
Not down and locked
What are the two types of brakes (Pad Style) used in aviation?
Organic and Semi-Metalic.
Excessive wear in the center of a tread of an aircraft tire is an indication of
Over inflation.
A method commonly used to prevent carburetor icing is to
Preheat the air intake
Debooster valves are used in brake systems primarily to:
Reduce pressure and stop fluid loss due to line rupture.
What is the purpose of the Brake Debooster valve?
Reduce the pressure to the brake and increase the volume of fluid flow
Debooster cylinders are used in brake systems primarily to
Reduce the pressure to the brake and increase the volume of fluid flow.
In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid control valve which
Relieves the hydraulic pressure on the brake
When installing pneumatic surface-bonded type deicer boots,
Remove all paint and clean surface from the area to be covered by the deicer boot.
What is done to a surface before installing pneumatic surface-bonded type deicer boots?
Remove all paint from the area to be covered by the deicer boot
When a properly operating fusible plug has allowed a tire to deflate, the tire should be
Replaced
A landing gear position and warning system will provide a warning in the cockpit when the throttle is:
Retarded and gear is not down and locked.
Squat switches prevent the landing gear from being ___________ while aircraft is on the ground
Retracted
One of the first major innovations in aircraft performance was the invention of:
Retracting Landing Gear
The Bungee cord is made of what material?.
Rubber
High pressure air valves are referred as
Schrader valve
What is the purpose of the distributor valve in a deicing system utilizing deicer boots?
Sequences the deicer boots for symmetrical inflations
The best safeguards against heat buildup in aircraft tires are:
Short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation.
If a shock strut bottoms after it has been properly serviced, the
Should be removed, disassembled, and inspected
When the emergency brake system is activated, what prevents compressed air from entering the main hydraulic system?
Shuttle Valve
Which of these components of a skid control system calculates how to apply the brakes so that the wheels will not skid.
Skid control box.
The main components of an antiskid system are
Skid control generator, skid control box and skid control valves.
The most popular landing gear for light helicopters is:
Skid gear
An electric motor used to raise and lower a landing gear would most likely be a
Split field series wound motor
In the air with the antiskid system armed, current cannot flow to the antiskid control box because the landing gear.stion
Squat switch is open.
What regulates the vacuum of the air pump to hold the deicer boots deflated when the pneumatic deicing system is off?
Suction Relief valve
Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?
Suction relief valve
In an airplane equipped with an alternate air system, if the main air duct filter becomes blocked or clogged, the
System will automatically allow warm, unfiltered air to be drawn into the engine.
What does the gear light indicator tell the operator of the aircraft?
The position of the aircraft landing gear.
What is used as a temperature-sensing element in an electrically heated windshield?
Thermistor
What is used in a temperature-sensing element in an electrically heated windshield?
Thermistor
What component controls the surface combustion heaters temperature?
Thermo cycling switches
You do not want to operate a windshield wiper on dry Plexiglas?
To prevent scratching the windscreen
What is the purpose of the distributor valve in a deicing system utilizing boots?
To sequence the deicer boots inflations symmetrically
What component keeps the landing gear wheel aligned with the longitudinal axis of the aircraft, on an oleo strut?
Torque Links
The first stage valve contains the
Torque motor
Which of these functions of a skid control system prevents the brakes from being applied during the landing approach, even if the brake pedals are depressed, to prevent the wheels from being locked when they contact the runway.
Touchdown protection.
Almost all modern production aircraft use __________________ type landing gear.
Tricycle
What are three types of landing gears?
Tricycle / Conventional / Tandem
The area provided to stow a retractable landing gear is known as the Wheel well
True
Excessive wear in the shoulder area of an aircraft tire is an indication of
Under-inflation.
Tires should be stored whenever possible
Vertically
Aircraft with fixed landing gear can reduce drag by using what type of components?
Wheel Pants
Over inflated aircraft tires may cause damage to the
Wheel flange.
Skid control generators are called
Wheel speed transducers
At what point in the landing operation does normal antiskid control perform its function
When wheel rotation deceleration indicates an impending skid.
Some aircraft are protected against icing by heating the leading edges of the airfoils and intake ducts. When is this type of anti-ice system usually operated in flight?
Whenever icing conditions are first encountered or expected to occur
What are the two possible locations could the landing gear be attached to the aircraft
Wing and Fuselage
In brake service work, the term "bleeding the brakes" is the process of:
Withdrawing fluid from the system for the purpose of removing air that has
A ground loop is associated with what type of landing gear ? ___________________
conventional
Aircraft brakes must be able to withstand tremendous amounts of heat when they convert the kinetic energy of the aircraft into heat during the deceleration of the aircraft.
true
Brake lining glazing is caused by improper application of the brakes by the pilot
true
Brake linings can be replaced without the total re manufacture of the brake assembly.
true
Carburetor heat should only be applied when needed prevent power loss and possible detonation.
true
Ozone is harmful to tires.
true
The most common way to prevent or remove carburetor ice preheat the intake air
true
The red dot on an aircraft tire generally indicates the light weight point of the tire.
true
How many Anti Skid Control Valves are used on an aircraft with 8 main wheels and two nose wheels?
8
Carburetor icing may be eliminated by which of the following methods?
Alcohol spray and heated induction air.
Lockout deboosters are primarily pressure reducing valves that:
Allow full Debooster piston travel without fluid from the high pressure side entering the low pressure chamber
Why do most aircraft tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then re-inflated to the correct pressure?
Allow the tube to position itself correctly inside the tire.
Why are the tubes in deicer boots alternately inflated?
Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum
What is the principle of a windshield pneumatic rain removal system?
An air blast forms a barrier that prevents raindrops from striking the windshield surface.
In an antiskid system, wheel speed is detected by
An electrical sensor.
An antiskid system is
An electrohydraulic system.
A high speed aircraft tire with a sound cord body and bead may be recapp
An indefinite number of times.
What is the prevention of ice formation called?
Anti-icing
How long should you wait after a flight before checking tire pressure?
At least 2 hours (3 hours in hot weather).
Aircraft tire pressure should be checked:
At least once a week or more often
The primary advantage of tricycle gear over conventional gear.
Better ground visibility
When two wheels are attached to a beam on one strut, the attached mechanism is referred to as a
Bogie
What two brake systems were developed for medium and heavy weight aircraft
Boosted and Power
List the two common ways to operate/retract landing gear systems
Both
1) When an aircraft is slowed below approximately 20 MPH, the antiskid system automatically deactivates to give the pilot full control of the brakes for maneuvering and parking. (2) An antiskid system consists basically of three components; wheel speed sensors, control box and control valves. Regarding the above statements,
Both No. 1 and 2 are true
1) An antiskid system is designed to apply enough force to operate just below the skid point. (2) A warning lamp lights in the cockpit when the antiskid system is turned off or there is a system failure. Regarding the above statements
Both No. 1 and No. 2 are true
What are the two methods of bleeding aircraft brakes?
Bottom up (Pressure) / Top Down ( gravity)
The locked wheel skid control causes the
Brake to be fully released when its wheel locks.
Which of the following is the best means to use when removing wet snow from an aircraft?
Brush or squeegee
An oleo strut uses _______ and _______ to absorb both taxi and landing shocks
air and oil
The floats on seaplanes and amphibians are normally made of
aluminum, Fiberglass
What is the purpose of a chine on an aircraft tire
keeps water from interning the engine of the aircraft
Name a type of Non-Absorbing Landing Gear __________________
spring steel
What type of emergency extension system allows the gear to fall into position under its own weight?
A Free Fall System
What type of defect might occur to the engine if carburetor heat is used when not needed?
A decrease in power and possibly detonation
The use of carburetor heat when it is not needed causes
A decrease in power and possibly detonation.
Carburetor icing on an engine equipped with a constant speed propeller can be detected by
A decrease on manifold pressure with a constant RPM.
A brake system using a floating rotor disk has a floating type caliper.
false
Aircraft tires are designed to flex less than automobile tires
false
It is necessary to remove the wheel in order to facilitate the removal of a floating type brake caliper.
false
Lubtork is the preferred assembly lubricant for magnesium wheels.
false
The most popular tread pattern found on aircraft today is the all weather tread
false
When bleeding brakes by the gravity method, the pressure pot hydraulic fluid is introduced into the system through the brake caliper.
false
