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
|
|
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
|
|
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
|
|
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 |
|
|
