HYDRUALIC SYSTEM Flashcards
BLEED AIR FOR HYDRUALICS
IS MAINLY USED IN THE RESERVOIR FOR HIGH ALTITUDES TO PREVENT FOAMING.
The main purpose of a hydraulic system is to ________.
multiple force
Pascal’s Law states:
Pascal’s Law states: Pressure applied to a confined liquid is transmitted equally in all directions without the loss of pressure and acts with equal force on equal surfaces. The shape of the container holding the liquid has no effect on the pressure or force relationships. THATS WHY WE CAN MOVE BIG SURFACES WITH LITTLE MOVEMENT.
This works because hydraulic fluid is ____________.
incompressible
Fluid supply (reservoir)
Fluid supply (reservoir) A reservoir can also serve as an overflow basin for excess hydraulic fluid forced out of the system by thermal expansion, allow air bubbles to be purged, and separate some foreign matter from the system
Current aircraft hydraulic system specifications require______ separate systems for operating the flight controls. All aircraft which utilize hydraulically actuated flight controls have at least two hydraulic power systems, one which supplies fluid pressure to the flight controls only, and another which supplies fluid pressure to the utility systems in addition to the flight controls. The utility system operates the landing gear, wing fold, wheel brakes and other such units.
two
HYDRAULIC ACCUMULATORS:
Hydraulic Accumulators:
It serves as a cushion, or shock absorber, by absorbing pressure surges in the system (such as engine shut-down or actuator operation)
It supplements the pump’s output when the pump is under peak load by storing energy in the form of fluid under pressure.
It stores enough fluid under pressure to provide for emergency operation of certain actuating units
Relief valves are simply a __________. It is a safety valve that is installed in the system to prevent pressure from building up to a point where seals might burst or damage may occur to the system.
pressure limiting device
Filters ensure delivery of contaminant free hydraulic fluid by preventing dust, grit and undesirable impurities from entering the system
A ____ differential pressure indicator button raises when differential pressure is exceeded indicating a clogged filter element
red
Hydraulic fuses are safety devices that are installed at strategic locations throughout a hydraulic system. They are designed to detect or gauge ruptures, failed fittings, or other leak-producing failures or damage. If a leak develops in a subsystem while the aircraft is flying, a fuse prevents excessive _____ of fluid yet it permits the operation of the remaining subsystem.
loss
Actuators convert fluid under pressure into linear or reciprocating mechanical motion
Actuators convert fluid under pressure into linear or reciprocating mechanical motion
What are the uses of a hydraulic accumulator?
What are the uses of a hydraulic accumulator? Accumulators maintain hydraulic fluid under pressure and system shock absorption during periods of high demand
