Airframe Landing Gear Systems (A9)

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

Fluid level

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

The brakes would drag

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

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

on all aircraft equipped with retractable landing gear, some means must be provided to

extend the landing gear if the normal operating mechanism fails.

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

fluid flow

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

in the aircraft manufacturer's service manual

extension of an oleo shock strut is measured to determine the

proper operation position of the strut

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

used only with a specific type of fluid

To prevent the 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

Which repair would require a landing gear retraction test?

Gear downlock microswitch

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

Maintain correct wheel alignment

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

Toe-out

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

deteriorated flexible hose

when an empty shock strut is filled 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

in shock struts, chevron seals are used to

prevent oil from escaping

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

releasing the air and seeing that the oil is to the level of the filler plug

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

the direction of fluid pressure

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

the fluid being forced through a metered opening

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

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

(Refer to figure 10 on page 9-7.) 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?

24

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

36.6

Aside from an external leak in the line, what will cause parking brakes to creep continually to the OFF position?

An internal leak in the master cylinder

Why do tire and wheel manufacturers often recommend that the tires on split rim wheels be deflated before removing the wheel from the axle?

As a safety precaution in case the bolts that hold the wheel halved together have been damaged or weakened.

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

air in the brake hydraulic line

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

center the nosewheel before it enters the wheel well.

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

collapsed and fluid added at the filler opening

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 consists of

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

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

limit the extension stroke

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 fusible plugs installed in some aircraft wheels will

melt at a specified elevated temperature

The metering pins in oleo shock struts serve to

retard the flow of oil as the struts are compressed

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

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

straightens the nose gear

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

strut should be removed, disassembled, and inspected

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3,000 PSI) is used to operate brakes

that are designed to work with lower pressure

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

firm brake pedals

an embossed letter "H" on an air valve core stem

indicates high-pressure type

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

inlet of the steer damper