Hydraulic 1
What function does the absolute pressure regulator perform in the pneumatic power system?
Regulates the compressor inlet air to provide a stabilized source of air.
Characteristics of MIL-H-8446 (Skydrol 500 A & B) hydraulic fluid are. (4 answers)
light purple color, phosphate ester base, fire resistant, butyl rubber seal
Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in
pounds per square inch.
seals used with a mineral base hydraulic fluid are identified by which color code?
blue dot or stripe.
where can information be obtained about the compatibility of fire-resistant hydraulic fluid with aircraft materials?
fluid manufacturer's technical bulletins.
In Top Gun, how did Goose keep up international relations?
The finger.
fluid is added to a reservoir in a constant pressure hydraulic system while the system is pressurized, what will result?
the fluid level will increase when system pressure is reduced.
a crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the other side, is used in
landing gear system.
installed in the aircraft to provide electrical/hydraulic power if the primary sources of aircraft power are lost?
Ram Air Turbine (RAT)
before removing the filler cap of a pressurized hydraulic reservoir, in order to service the system, you must
relieve the air pressure.
if a hydraulic brake system uses neoprene rubber packing materials, the correct hydraulic fluid to service the system is
mineral base oil.
Which 2 Founding Fathers died on the same day?
Jefferson and Adams
An aircraft's constant-pressure hydraulic system cycles more frequently than usual, and no fluid leakage can be detected.
low accumulator air preload.
hydraulic component that directs fluid from either the normal source or an emergency source to an actuator is called a
shuttle valve.
what acts as pressure limiting units and prevent excessive pressures from bursting lines and blowing out seals?
relief valves
if a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening
may distort the flare.
which is a characteristic of petroleum base hydraulic fluid?
flammable under normal conditions.
what ocean animal has 3 hearts?
Octopus
dents are not allowed in the heel of a tube but they are allowed if they are less than what precent of the diameter?
20
what is the main purpose of a pressurized reservoir in a hydraulic system?
prevent hydraulic pump cavitation.
relief valves are used in pneumatic systems
as damage-preventing units.
if it is necessary to adjust several pressure regulating valves in a hydraulic system, what sequence should be used.
units with the highest pressure settings are adjusted first.
most variable displacement aircraft hydraulic pumps in use
contain a built-in means of system pressure regulation.
When they group together, they become a murder.
Crows
which is the most commonly used seal to prevent internal and external leakage in both directions of a hydraulic unit?
O-Ring
components containing phosphate ester-base hydraulic fluid may be cleaned with
stoddard solvent.
in a pneumatic system, if the moisture separator doesn't vent accumulated water when the compressor shuts down, cause is
malfunctioning solenoid dump valve.
in a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the
shear pin
Characteristics of MIL-H-5606 hydraulic fluid are
red color, petroleum base, will burn, uses synthetic rubber seals.
Meatloaf will do anything for love but..
He won't do that.
if hydraulic fluid is released when the air valve core of the accumulator is depressed, it is evidence of
A ruptured diaphragm or leaking seals.
part that connects emergency power and disconnects the normal hydraulic source from the landing gear or wheel braking system.
shuttle valve.
An accumulator is charged with 1,000 PSI of air. When system pressure is 3,000 PSI, accumulator pressure will be
3000 psi
some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line.
hydraulic fuse.
the outlet port with the standpipe in it furnishes fluid to the
normal system power pump.
Do helos have their PIC seat on the right?
Sikorsky preferred the right seat.
if an aircraft hydraulic system requires mineral base hydraulic fluid, but phosphate ester base hydraulic fluid is used.
system will be contaminated, fluids will not blend, and the seals will fail
if a hydraulic pump of the correct capacity fails to hold normal system pressure during operation of a cowl flap unit.
restriction in the pump outlet.
hydraulic system thermal relief valves are set to open at a
higher pressure than the system relief valve.
one of the distinguishing characteristics of an open-center selector valve used in a hydraulic system is that
fluid flows through the valve in the OFF position.
type of selector valve is the most commonly used in systems to provide for flow of fluid into and out of an actuator.
four-port, closed-center valve.
A car will spend 95% of it's life doing this
Parked
two types of hydraulic fluids currently being used in civil aircraft are
mineral base, and phosphate ester base.
What is used to flush a system normally serviced with MIL-H-5606 hydraulic fluid?
naphtha or varsol.
which seal/material is used with phosphate ester base hydraulic fluids?
Butyl rubber.
type of valve in a hydraulic system allows fluid to flow in one direction, but restricts the flow in the other direction
orifice check valve.
the removal of air from an aircraft hydraulic system is generally accomplished
by operating the various hydraulic components through several cycles.
The dumb thing young people do that I can't stand
6 7
the purpose of the pressure regulator in a hydraulic system is to
maintain system operating pressure to a set range and to unload the pump
Hand pump, pressure of 100 PSI in a hydraulic system, 1 inch piston, 1/2 inch line to 2 inch cylinder. Pressure is?
100 psi
petroleum base hydraulic fluid is which color
Red
a worn hydraulic pump shaft seal can normally be detected by
hydraulic fluid flowing from the pump drain line.
an emergency supply of fluid is often retained in the main hydraulic system reservoir by the use of a standpipe.
the supply line is connected to inlet of the main hydraulic system.
The all-female squardon that flew for Russia in WW2
The Night Witches.
which hydraulic fluid is adversely affected by atmospheric humidity if left unprotected?
Skydrol hydraulic fluid.
generally, the first step in removing an accumulator from an aircraft is to
relieve system pressure.
to protect seals from damage when installed over a threaded section, the threaded section should be
covered with a suitable sleeve.
a loud hammering noise in a hydraulic system having an accumulator usually indicates
too low or no preload in the accumulator.
a hydraulic motor converts fluid pressure to
rotary motion.
hodgepodge of liquors, hot sauce, mustard, and weird items.
teflon hose that has developed a permanent set from being exposed to high pressure or temperature should
not be straightened or bent further.
after installation of a rebuilt hydraulic hand pump, the handle cannot be moved in the pumping direction, the cause is
hand pump outport check valve.
a unit which transforms hydraulic pressure into linear motion is called
an actuating cylinder.
What is the purpose of using backup rings with O-rings in hydraulic systems above 1,500 PSI?
stop high pressure from extruding a seal at the moving and stationary part
a flexible sealing element subject to motion is a
packing
What Carrot-loving larpin is an Honorary Marine
Bugs Bunny.