Service A Hydraulic Reservoir Flashcards
What are two basic types of hydraulic fluid used in modern aircraft?
Mineral base fluid and phosphate ester base fluid
Does the main hydraulic pump take its fluid from the bottom of the reservoir, or from a standpipe?
The main pump normally takes its fluid from a standpipe, emergency from the bottom of the reservoir
Why are some hydraulic reservoirs pressurized?
Pressurization ensures that fluid will be supplied to the inlet of the pumps at high altitude where there is not enough atmospheric pressure to do this
What are two ways aircraft hydraulic reservoirs may be pressurized?
By an aspirator in the fluid return line or by bleed air from one of the engine compressors
What is used to flush a hydraulic system that uses shydrol hydraulic fluid?
Trichlorethylene or the solvent recommended by the aircraft manufacturer
What is used to flush a hydraulic system that uses mineral base hydraulic fluid?
Naphtha, varsol or stoddard solvent
Where can you find the type of hydraulic fluid required for a particular aircraft?
In the maintenance manual for the aircraft. The information is also placed on a placard on the system resevoir
What is used to remove phosphate-ester base hydraulic fluid from aircraft tires?
Soap and water
How can you be sure that a replacement seal in a hydraulic component is compatible with the fluid used in the system?
Use only the seal identified by part number that is specified in the component maintenance manual
What must be done to the lines that are disconnected when replacing an aircraft hydraulic system component?
They must be capped with a cap or plug
What must be done before a pressurized resevoir is serviced?
All of the pressure must be bleed off
