Reservoir and Filters Flashcards
2 Types of reservoir
Integral reservoir : Not used on modern aircraft
In-Line reservoir : most commonly used (modern aircraft)
2 types of pressurization reservoir
Unpressurized - Used on low flying aircraft.
Pressurized - Used on high flying aircraft.
You pressurized reservoir when flying at high altitudes because atmospheric pressure is low. This prevents ________ (malfunction caused by air entering) and foaming by ensuring a positive fluid supply to the pump during all flight phases.
pump cavitation
Method of pressurizing:
Installed in return line to reservoir. Cabin/ambient air is drawn through aspirator to pressurize airspace at the top of the reservoir.
Aspirartor
Method of pressurizing:
using pressure from engine
Engine bleed air
Pressure ranges by each type of pressurized reservoir:
Aspirator: _______?
Engine Bleed Air: 40-45 psi
30-35 psi
Pressure ranges by each type of pressurized reservoir:
Aspirator: 30-35 psi
Engine Bleed Air: ______?
40-45 psi
As a general guideline, unpressurized reservoirs are serviced directly at the _____.
reservoir
Pressurized reservoirs are serviced directly at a ______ using a hand pump, an external pump or a ground unit.
remote servicing station
3 hydraulic system applications for filters:
Pressure flow
Return flow
Hydraulic pump case drain: used for cooling and lubricating the pump.
Unit used for measuring a filter’s filtering capacity?
Micron
A filter that uses pleated paper element wrapped around a spring steel wire coil is a _______. This is usually used on the RETURN flow.
micronic filter
A filter that uses a stainless steel wire woven into a mesh to provides the filtration is called a ______.
metallic filter
A filter that uses 2 filters, a primary and secondary one, each with a different level of micron filtration, is called ________.
a two-stage filter
A filter that consist of a stack of discs and spacers mounted on a rod is called a ______.
cuno filter
A _____ indicator on a filter identifies a potential clogging condition and the possible bypass of the filter element in the some instance.
“pop-out”
System filters are often a part of a larger assembly called a _______.
filter module
_________ (motive fluid flow provided by variable displacement hydraulic pump)
Cabin and/or Ambient air is drawn in through the Aspirator to pressurize the air space at the top of the reservoir
Aspirator
Hydraulic system pressure acts on small piston
and differential areas of large and small pistons allow the reservoir fluid to be pressurized
Bootstrap pressurization
