Reservoir and Filters

Question 1

2 Types of reservoir

Answer 1

Integral reservoir : Not used on modern aircraft

In-Line reservoir : most commonly used (modern aircraft)

Question 2

2 types of pressurization reservoir

Answer 2

Unpressurized - Used on low flying aircraft.

Pressurized - Used on high flying aircraft.

Question 3

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.

Answer 3

pump cavitation

Question 4

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.

Answer 4

Aspirartor

Question 5

Method of pressurizing:

using pressure from engine

Answer 5

Engine bleed air

Question 6

Pressure ranges by each type of pressurized reservoir:

Aspirator: _______?
Engine Bleed Air: 40-45 psi

Answer 6

30-35 psi

Question 7

Pressure ranges by each type of pressurized reservoir:

Aspirator: 30-35 psi
Engine Bleed Air: ______?

Answer 7

40-45 psi

Question 8

As a general guideline, unpressurized reservoirs are serviced directly at the _____.

Answer 8

reservoir

Question 9

Pressurized reservoirs are serviced directly at a ______ using a hand pump, an external pump or a ground unit.

Answer 9

remote servicing station

Question 10

3 hydraulic system applications for filters:

Answer 10

Pressure flow

Return flow

Hydraulic pump case drain: used for cooling and lubricating the pump.

Question 11

Unit used for measuring a filter’s filtering capacity?

Answer 11

Micron

Question 12

A filter that uses pleated paper element wrapped around a spring steel wire coil is a _______. This is usually used on the RETURN flow.

Answer 12

micronic filter

Question 13

A filter that uses a stainless steel wire woven into a mesh to provides the filtration is called a ______.

Answer 13

metallic filter

Question 14

A filter that uses 2 filters, a primary and secondary one, each with a different level of micron filtration, is called ________.

Answer 14

a two-stage filter

Question 15

A filter that consist of a stack of discs and spacers mounted on a rod is called a ______.

Answer 15

cuno filter

Question 16

A _____ indicator on a filter identifies a potential clogging condition and the possible bypass of the filter element in the some instance.

Answer 16

“pop-out”

Question 17

System filters are often a part of a larger assembly called a _______.

Answer 17

filter module

Question 18

_________ (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

Answer 18

Aspirator

Question 19

Hydraulic system pressure acts on small piston

and differential areas of large and small pistons allow the reservoir fluid to be pressurized

Answer 19

Bootstrap pressurization