Aircraft Landing Gear Systems

Question 1

An O-ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with

Answer 1

A blue stripe or dot.

Question 2

To prevent a very rapid extension of an oleo shock strut after initial compression resulting from landing impact

Answer 2

Various types of valves or orifices are used which restrict the reserve.

Question 3

The primary purpose for balancing aircraft wheel assemblies is to

Answer 3

Prevent heavy spots and reduce vibration.

Question 4

When will a continuous horn provide a warning in the cockpit?

Answer 4

When the throttle is retarded and gear is not down and locked.

Question 5

Which statement is true with respect to an aircraft equipped with hydraulically operated multiple-disk type brake assemblies?

Answer 5

Do not set parking brake when brakes are hot.

Question 6

Lockout deboosters are primarily pressure reducing valves that

Answer 6

Allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber.

Question 7

Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation?

Answer 7

Expander-tube type.

Question 8

Why do most tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then reinflated to the correct pressure?

Answer 8

To allow the tube to position itself correctly inside the tire.

Question 9

What is one effect a restricted compensator port of a master cylinder will have on a brake system?

Answer 9

The restriction will cause slow release of the brakes.

Question 10

Debooster valves are used in brake systems primarily to

Answer 10

Reduce the pressure and release the brakes rapidly.

Question 11

Power boost brake systems are used on aircraft that have

Answer 11

High landing speeds

Question 12

Excessive wear in the center of the tread of an aircraft tire is an indication of

Answer 12

Overinflation

Question 13

An electric motor used to raise and lower a landing gear would most likely be a

Answer 13

Split field series-wound motor.

Question 14

On most aircraft, the oil level of an air and oil shock strut is checked by

Answer 14

Releasing the air and seeing that the oil is to tone? level of the filler plug

Question 15

When working with high pressure, high performance tires, why is it recommended to deflate the tires when removing wheels from the axle?

Answer 15

To ensure safety in case of a defective wheel or broke tire bolts.

Question 16

A pilot reports that the brake pedals have excessive travel. A probable cause is

Answer 16

Lack of fluid in the brake system.

Question 17

The removal, installation, and repair of landing gear tired by the holder of a private pilot certificate on and aircraft owned or operated is considered to be

Answer 17

Preventive maintenance

Question 18

If a brake debooster is used in a hydraulic brake systems, its position in the system will be

Answer 18

Between the brake control valve and the brake actuating cylinder.

Question 19

The purpose of a relief valve in a brake system is to

Answer 19

Compensate for thermal expansion.

Question 20

In shock struts, chevron seals are used to

Answer 20

Prevent oil from escaping

Question 21

Aircraft brakes requiring a large volume of fluid to operate the brakes generally

Answer 21

Use power brake control valves.

Question 22

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 fluid
8) solvents

Answer 22

2,3,4,6,7,8

Question 23

If a shock strut bottoms after it has been properly serviced, the

Answer 23

Strut should be removed, disassembles, and inspected.

Question 24

The left brake is dragging excessively on an airplane on which no recent brake service work has been performed. The most probable cause is

Answer 24

Foreign particles stuck in the master cylinder compensating port.

Question 25

How long should you wait after a flight before checking tire pressure?

Answer 25

At least 2 hours (3 hours in hot weather.)

Question 26

(Refer to Figure 10.) The trunnion nut on an aircraft landing gear requires a torque of 320 inch pounds. To reach the nut, a 2-inch straight adapter must be used on an 18-inch torque wrench. How many foot-pounds will be indicated on the torque wrench when the required torque of the nut is reached?

Answer 26

24

Question 27

The repair for an out-of-tolerance toe-in condition of main landing gear wheels determined not to be the result of bent or twisted components consist of

Answer 27

Inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissor torque links.

Question 28

A filter incorporating specially treated cellulose paper is identified as a

Answer 28

Micronic filter

Question 29

When bleeding aircraft brakes, one of the indications that air has been purged from the system is

Answer 29

Firm brake pedals.

Question 30

Chines are used on some aircraft nose wheel tires to help

Answer 30

Deflect water away from the fuselage.

Question 31

Aircraft tire pressure should be checked at least once a week or more often

Answer 31

At least once a week or more often.

Question 32

The purpose of a sequence valve in a hydraulic retractable landing gear system is to

Answer 32

Ensure operation of the landing gear and gear doors in the proper order.

Question 33

What condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating?

Answer 33

Inadequate supply of fluid.

Question 34

In brake service work, the term 'bleeding brakes' is the process of

Answer 34

Withdrawing fluid from the system for the purpose of removing air that has entered the system.

Question 35

The fusible plugs installed in some aircraft wheels will

Answer 35

Melt at a specific elevated temperature.

Question 36

The braking action of a cleveland disk brake is accomplished by compressing a rotating brake disk between two opposite brake linings. How is equal pressure on both sides of the rotating disk assured?

Answer 36

By allowing the caliper to float to automatically equalize as pressure is applied to the rotor.

Question 37

Instructions concerning type of fluid and amount of air pressure to be put in a shock strut are found

Answer 37

In the aircraft manufacturer's service manual

Question 38

What would be the effect if the piston return spring broke in a brake master cylinder?

Answer 38

The brakes would drag.

Question 39

What is the purpose of a compensating port or valve in a brake master cylinder of an independent brake system?

Answer 39

Permits the fluid to flow toward or away from the reservoir as temperature changes.

Question 40

On an air valve core stem, what indicates high-pressure type?

Answer 40

An embossed letter 'H'

Question 41

When installing a chevron-type seal in an aircraft hydraulic cylinder, the open side of the seal should face

Answer 41

The direction of fluid pressure.

Question 42

When and air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by

Answer 42

The fluid being forced through a metered opening.

Question 43

A pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner. The probable cause is

Answer 43

Air in the brake hydraulic system.

Question 44

When servicing an air/oil shock strut with MIL-5606 the strut should be

Answer 44

Collapsed and fluid added at the filler opening.

Question 45

A flexible hydraulic hose identified as MIL-H-8788 will have a stripe running the length of the hose. This stripe is

Answer 45

Installed without excessive twisting.

Question 46

A hydraulic system referred to as a 'power pack' system will have

Answer 46

All hydraulic power components located in one unit.

Question 47

What is the function of a cam incorporated in a nose gear shock strut?

Answer 47

Straightens the nose wheel.

Question 48

When servicing an empty shock strut with fluid, the strut should be completely compressed and extended several times to ensure

Answer 48

Proper packing ring seating and removal of air bubbles

Question 49

On an aircraft equipped with retractable landing gear, some means must be provided to

Answer 49

Extend the landing gear if the normal operating mechanism fails.

Question 50

If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause?

Answer 50

Deteriorated flexible hoses.

Question 51

How is it determined in a master cylinder brake system that all of the air has been purged from the system?

Answer 51

By depressing the brake and noting that the brake is firm and not spongy.

Question 52

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3000 PSI) is used to operate brakes.

Answer 52

That are designed to work with lower pressure.

Question 53

Over inflated aircraft tires may cause damage to the

Answer 53

Wheel flange

Question 54

The best safeguards against heat build up in aircraft tires are

Answer 54

Short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation.

Question 55

Nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to

Answer 55

Center the nose wheel before it enters the wheel well.

Question 56

If an airplane equipped with master cylinders and single-disk brakes are excessive brake pedal travel, but the brakes are hard and effective, the probable cause is

Answer 56

Worn brake linings.

Question 57

The hydraulic packing seals used in a landing gear shock strut are

Answer 57

Used only with a specific type of fluid.

Question 58

What should be checked when a shock strut bottoms during a landing?

Answer 58

Fluid level

Question 59

A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a

Answer 59

Slippage mark

Question 60

Excessive wear in the shoulder area of an aircraft tire is an indication of

Answer 60

Underinflation

Question 61

What is the purpose of the torque link attached to the cylinder and piston of a landing gear oleo strut?

Answer 61

Maintain correct wheel alignment

Question 62

The purpose of an orifice check valve is to

Answer 62

Restrict flow in one direction and allow free flow in the other.

Question 63

The pressure source for power brakes is

Answer 63

The main hydraulic system.

Question 64

Extension of an oleo shock strut is measured to determine the

Answer 64

Proper operating position of the strut.

Question 65

An automatic damping action occurs at the steering damper if for any reason the flow of high pressure fluid is removed from the

Answer 65

Inlet of the steering damper.

Question 66

A close inspection of a fusible plug reveals the core has experience some deformation. What is the appropriate maintenance procedure?

Answer 66

Replace all the fusible plugs.

Question 67

What action should be taken whenever maintenance is performed that will affect the landing gear system performance?

Answer 67

The aircraft should be place on jacks and a retraction test should be performed.

Question 68

Internal leakage in a brake master cylinder unit can cause

Answer 68

The pedal to slowly creep down while pedal pressure is applied.

Question 69

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?

Answer 69

Correct the discrepancy and enter in the aircraft records.

Question 70

The current inflation pressure for an aircraft tire can be obtained from

Answer 70

The aircraft service manual.

Question 71

What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system?

Answer 71

A shuttle valve

Question 72

The metering pins in oleo shock struts serve to

Answer 72

Retard the flow of oil as the struts are compressed.

Question 73

Aside from an external leak in the line, what will cause parking brakes to continually bleed off pressure?

Answer 73

An internal leak in the master cylinder

Question 74

What is the minimum amount of time to wait for tires to cool before checking the tire pressure?

Answer 74

3 Hours

Question 75

If the extended longitudinal axis of the main landing gear wheel assemblies intersects aft of the aircraft, the wheels can be termed as having

Answer 75

Toe-out

Question 76

Debooster cylinders are used in brake systems primarily to

Answer 76

Reduce the pressure to the brake and increase the volume of fluid flow.

Question 77

A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo strut shock strut to

Answer 77

Limit the extension stroke.

Question 78

What device in a hydraulic system with a constant-delivery pump allows circulation of the fluid when no demands are on the system?

Answer 78

Pressure regulator

Question 79

If an aircraft shock strut (air/oil type) bottoms upon initial landing contact, but functions correctly during taxi, the most probable cause is

Answer 79

Low fluid

Question 80

A fully-charged hydraulic accumulator provides

Answer 80

A source for additional hydraulic power when heavy demands are placed on the system.

Question 81

A special bolt in a landing gear attachment requires a torque value of 440 inch pounds. How many foot-pounds are required?

Answer 81

36.6

Question 82

A high-speed aircraft tire with a sound cord body and bead may be recapped

Answer 82

An indefinite number of times.