Shared Flashcard Set

Details

Hydraulic and Pneumatic Power Systems-DME Oral
Airframe ASA 21 Questions
21
Aviation
Undergraduate 1
09/06/2015

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Cards

Term
What are methods of pressurizing a hydraulic reservoir?
Definition

Cabin pressurization, turbine compressor, an aspirator
and a venturi-tee

Term
What would cause a hydraulic filter to go into open bypass, allowing unfiltered fluid into the system?
Definition
A clogged filter
Term
What feature is built into a hydraulic pump-drive system to prevent engine damage in the event of pump seizure or overload?
Definition
A shear section in the pump-drive shaft
Term
What color is mineral base hydraulic fluid?
Definition
Red
Term
What are three types of hydraulic fluids?
Definition

Mineral, vegetable and phosphate ester based fluids

 

 

Term
What happens to plastic resins, vinyl compositions, lacquers, and oil base paints if exposed to a phosphate ester base hydraulic fluid such as "Skydrol"
Definition
The material will be damaged, softened or peeled
Term
What precautions should be taken to minimize contamination during replacement of a hydraulic unit?
Definition
All lines should be plugged or capped after disconnecting and cleaned before assembly
Term
What are the sources of hydraulic pressure in aircraft?
Definition

 

Engine-driven, electrically-driven and hand pumps

Term
What must be accomplished with any accumulator prior to disassembling?
Definition
Make sure air or preload has been discharged
Term
What is the purpose of restrictors that are used in aircraft pneumatic systems?
Definition
To control the rate of airflow
Term
Why should a pneumatic system be purged periodically?
Definition
To remove contamination and moisture
Term
What happens to excessive pressure in a pneumatic system?
Definition
A relief valve will bleed it to the atmosphere
Term
For what purposes are pneumatic systems used in some aircraft?
Definition

Engine starting for operating brakes, doors and drive pumps

Term
What is used in some hydraulic systems to supplement the power pump when several units are operated at the same time?
Definition
An accumulator
Term
What is the purpose of a pressure relief valve?
Definition
Preventing failure of the system components by limiting the amount of pressure
Term
How does a gear-type pump operate?
Definition
Two meshed gears that revolve in a housing are driven by a power unit. Fluid is trapped and pressurized as the gears turn
Term
What are two types of engine-driven hydraulic pumps?
Definition
Constant and variable delivery
Term
What is the purpose of a pressure regulator?
Definition
To manage the output of a pump
Term
Name the types of accumulators?
Definition

Diaphragm, bladder and piston

Term
What are sources of pneumatic power?
Definition

Storage bottles, vane-type pumps and turbine engine compressors

Term
What must be accomplished with any accumulator prior to disassembling?
Definition
Make sure the air or preload has been discharged
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