Navair 01-1A-17 Flashcards
(25 cards)
Why is hydraulic fluid colored red?
Can be distinguished from incompatible fluids.
Flash point, fire point, and spontaneous ignition temperature of MIL-PRF-83282 exceed that of MIL-PRF-5606 by more than ____.
200 degrees F (93 degrees C)
What is the most common type of contamination found in aircraft hydraulic systems?
Solid matter
What are the types of contamination in hydraulic fluid?
organic, metallic solids, nonmetallic (inorganic) solids, foreign fluids, air, and water.
How are organic compounds produced?
wear, oxidation, or polymerization
What is the principal causes of wear in hydraulic pumps, actuators, valves, and servovalves?
Particulate Contamination
What type of contamination can cause cavitation?
Air contamination
Where should a fluid sample be drawn out from?
from a main system return line, pump suction line, or system reservoir. Or from turbulent high-flow areas
What are the five methods to decontaminating aircraft hydraulic systems?
Air bleeding, Recirculation cleaning, Purifying, Flushing, Purging
filtration process and can remove only that foreign matter which is retained by the filter elements normally found in the equipment.
Recirculation cleaning
What is the key factor in recirculation cleaning?
The utilization of high-efficiency 3-micron filter elements.
The process of removing particulate, air, water, and volatile contaminants from the hydraulic fluid without altering the physical or chemical properties.
Purification
In purifying, contaminated fluid going to the purifier tower is first filtered by a _______ filter.As the fluid comes out of the tower, it is filtered through a ________ to remove solid particles.
25-micron filter; 3-micron filter
Is a decontamination method in which contaminated system fluid is removed to the maximum extent practicable and then discarded.
Flushing
Is a decontamination process in which the aircraft hydraulic system is drained to the maximum extent practicable and the removed fluid discarded. A cleaning agent is then introduced.
Purging
What method of decontamination of hydraulic systems is proven most effective?
Recirculation
For recirculation, operate all circuits on the system under-going decontamination a minimum of __ complete cycles?
15
For purifying, to prevent overfilling the test stand reservoir may need to be under filled (_______) prior to connecting it to aircraft and monitored.
half full
In flushing, what happens to the return fluid from the aircraft.
It will be disposed of properly.
In flushing, monitor the reservoir level in the external hydraulic source continuously during the operation. Replenish the reservoir using approved fluid dispensing equipment before the level decreases to the _______ point.
half-full
In flushing, the operation shall persist until the amount of fluid collected from the aircraft/SE return line is equivalent to approximately how many times fluid capacity of the affected system?
three times the fluid capacity of the affected system.
In normal operations, keep portable hydraulic test stand reservoirs above ______ full.
three-quarters
In recirculation cleaning, maintain flow long enough to allow a total flow equivalent to at least ____ times the total fluid capacity of the equipment reservoir. (SE only)
5
In flushing, monitor reservoir level during the operation to prevent the reservoir level from dropping below the _____ point (SE only)
one-third
