Lesson 3: RESERVOIRS AND FILTERS Flashcards
What is the purpose of a RESERVOIR?
Store fluid
Thermal Expansion
Air purging
Cooling (external fins)
What is a FILLER NECK?
Add fluid
Lower than top to provide foaming space
This component in the reservoir prevents surging/swirling of fluid and to separate air from fluid at return flow
Integral fins
Baffles
What are the 2 types of reservoirs?
Integral
IN LINE
Which reservoir is used for modern aircraft?
IN LINE
This type of reservoir is used for aircraft that fly at LOW altitudes
Unpressurized
What are the characteristics of an UN-PRESSURIZED reservoir?
Atmosphere vented
Filler cap at reservoir
Serviced while working
Integral return filter
This type of reservoir is used for aircraft that fly at HIGHER altitudes to compensate for low ambient pressures
PRESSURIZED
What is the purpose of PRESSURIZED reservoirs?
Positive pressure on fluid
Prevent CAVITATION
Prevent foaming
What are the 3 types of PRESSURIZED reservoirs?
Aspirator(variable dis. pump)
Engine Bleed Air
Hydraulic System pressure
This type of reservoir is installed in the RETURN line and uses CABIN/AMBIENT air
Aspirator
What is the header pressure of an ASPIRATOR regulator?
30-35 psi
This type of reservoir uses the COMPRESSOR to keep header pressure at 40-45 psi
ENGINE BLEED AIR
Ground pressurization valves are used for what?
Maintenance for engine bleed air
This type of reservoir uses differential piston and has a pressure ratio of 50:1
BOOTSTRAP
What are the 2 ways of servicing a hydraulic system?
Suction hose
External hand pump
What are the applications of a hydraulic FILTER?
Pressure
Return
Case drain
This type of filter uses a pleated paper element, disposable and is most commonly used on he RETURN line
MICRONIC
This type of filter is made from a stainless steel wire woven into mesh
METALLIC
Two stage filters are usually used fro what?
Return of large aircraft
If the flow is greater than 5-7 gallons what happens?
Bypass PRIMARY to reduce pressure drop
This type of filter is used on the pressure side and consists of discs/spacers
CUNO
What does a pop out identify?
Clogging
What is the purpose of a THERMAL LOCKOUT DEVICE?
Prevent false indication when the fluid is COLD
What is filter module?
what the system filters are part of
Where do you check for signs of leakage?
Filter bowl
Housing
