Key Terms Flashcards
Compressed air tapped from the compressor stages of a turbine engine by use of ducts and tubing. Bleed air can be used for deice, anti-ice, cabin pressurization, heating, and cooling systems.
Bleed Air;
An type of engine-driven vacuum pump that requires the use of engine oil to lubricate the vanes and inner workings of the pump. An oil separator that keeps oil from contaminating the vacuum system is also required.
Wet Pump;
An engine-driven, self-lubricating, vane-type vacuum pump.
Dry Pump;
A device used in a pneumatic system separates mixture from the air.
Moisture separator;
A valve, mounted on critical components, that directs system pressure into the actuator for normal operation but switches to emergency fluid when the emergency system is actuated.
Shuttle valve;
A valve in an aircraft pneumatic system that can be shut off to isolate the components from the source of air pressure so maintenance can be performed without discharging the system.
Isolation valve;
A form of constant displacement
pump using a spur gear driven by the engine and turning inside of an internal tooth gear. The inter- nal tooth gear has one more space than teeth on the drive gear. As the pump rotates, the volume at the inlet port increases while the volume at the outlet decreases, moving fluid through the pump.
Gerotor pump
A constant displacement, fluid-moving pump in which a rotor containing sliding vanes turns in an eccentric cavity to force the fluid through the pump.
Vane-type pump
The pressure at which the pre- load nitrogen in a hydraulic system accumulator has been charged to.
Preload pressure
A type of accumulator found in aircraft hydraulic systems. Smaller in diameter than either diaphragm or bladder accumulators, the piston accumulator uses a free-floating o-ringed
and then the temperature is lowered to 80° at a rate of 5° per minute. This process is typically done by using a temperature controller found on hot patch bonding equipment.
Piston accumulator
A type of hydraulic accu- mulator in which a synthetic bladder inside a welded steel sphere separates the pressurized nitro- gen charge from the aircraft hydraulic system. The nitrogen supplies a preloaded charge to the hydrau- lic system and maintains pressure in the system even when the pumps are not operating.
Bladder accumulator
A type of hydraulic accumulator in which a diaphragm inside a steel sphere separates the nitrogen charge from the air- craft hydraulic fluid system. Hydraulic fluid enters the diaphragm while the nitrogen supplies a pre- load charge to the system and maintains pressure even when the pumps are not operating.
Diaphragm accumulator
A type of seal available in different circular diameters made of synthetic or hydrocar- bon materials and used in fluid connecting systems. O-rings prevent fluid leakage in metal-to-metal joints or connections.
O-ring seal
The proprietary name of a fluid filter made up of a stack of discs separated by scraper blades. Contaminants collect on the edge of the discs and are periodically scraped out and collected in the bottom of the filter case.
CUNO® filter
