Mod 16, Unit 2, Quiz 4, Hydraulic Subsystems
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
a shuttle valve
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
air in the brake hydraulic system
On an air valve core stem, what indicates high pressure type
an embossed letter H
Aside from an external leak in the line what will cause parking brakes to continually bleed of pressure
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 halves together have been damaged or weakened
Aircraft tire pressure should be checked
at least once a week or more often
Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation
expander tube type
On all aircraft equipped with retractable landing gear, some means must be provided to
extend the landing gear if the normal operating mechanism fails
A sleeve, spacer, or bumper ring is incorported in a landing gear oleo shock strut to
limit the extension stroke
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 aircrafts landing gear system which may have affected the systems operation, it is usually necessary to
make an operational check with the aircraft on jacks
The removal, installation, and repair of landing gear tires by the holder of a private pilot certificate on an aircraft owned, or operated is considered to be
prevenative maintenance
Debooster valves are used in brake systems primarily to
reduce the pressure and release the brakes rapidly
The metering pins in oleo struts serve to
retard the flow of oil as the struts are compressed
A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube type tire is a
slippage mark
A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3000 psi) is used to operate brakes
that are designed to work with lower pressure
When an air/oil type of landing gear shock strut is used, the inital shock of landing is cushioned by
the fluid being forced through a metered opening
The pressure source for power brakes is
the main hydraulic system
Internal leakage in a brake master cylinder unit can cause
the pedal to slowly creep down while pedal pressure is applied
What is one effect of a restricted compensator port of a master cylinder will have on a brake system
the restriction will cause slow release of the brakes
Why do most aircraft tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then reinflated to the correct pressure
to allow the tube to position itself correctly inside the tire
The braking action of a clevland 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
by allowing the caliper to float to automaticaly equalize as pressure is applied to the rotor
When servicing an air/oil shock strut with MIL-5606 the strut should be
collapsed and fluid added at the filler opening
The purpose of a relief valve in a brake system is to
compensate for thermal expansion
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 hoses
Which statement is true with respect to an aircraft equipped with hydraulically operated multiple disk type brake assemblies
do not set parking brake when brakes are hot
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
When bleeding aircraft brakes one of the indications that the air has been purged from the system is
firm brake pedals
Power boost brake systems are used on aircraft that have
high landing speeds
Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found
in the aircraft manufacturers service manual
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
Aircraft brakes requiring a large volume of fluid to operate the brakes generally
use power brake control valves
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 ehich restrict the reverse fluid flow
Overinflated aircraft tires may cause damage to the
wheel flange
In 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