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14 Cards in this Set
- Front
- Back
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Of what material are most low pressure rigid fluid lines made? |
1100-1/2 hard or 3003-1/2 aluminum alloy tubing |
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Is the size of a rigid fluid line determined by its inside or outside diameter? |
Outside diameter |
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When routing a fluid line parallel to an electrical wire bundle, which should be on top? |
Electrical wire bundle |
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What is the function of the lay line ( the identification stripe) that runs the length of a flexible hose? |
Shows whether or not the line has been twisted when installed. ( line should be straight not spiraled) |
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How can you distinguish an AN fluid line fitting from a AC fitting? |
AN fitting- has a shoulder between the end of the flare cone and the first thread AC fitting- extend all of the way to the flare cone. |
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Where are quick disconnect fluid line couplings normally used in a aircraft hydraulic system? |
Engine driven pump connects into the hydraulic system |
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Size of a flexible hose determined by its inside or outside diameter? |
Inside diameter |
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What is the maximum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system? |
5 percent longer than the distance between the fittings |
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How tight should an MS flareless fitting be tightened? |
By hand til snug, and then with wrench for a 1/6 turn to 1/3 turn. NEVER MORE THEN 1/3 turn |
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What damage can be caused by over tightening an MS flareless fitting? |
Drives the cutting edge of the sleeve deeply into the tube and weakens it |
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What kind of rigid tubing can be flared with a double flare? |
5052-O and 6061-T aluminum alloy tubing in sizes from 1/8 inch to 3/8 inch OD |
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What is the principal advantage of Teflon hose for use in aircraft hydraulic system? |
Retains high strength under high temperatures |
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What precautions should be taken when flaring a piece of aluminum alloy tubing? |
End of tubing must be polished so it will not crack when it’s stretched with a flaring tool |
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How much pressure is used to proof test a flexible hose assembly? |
Varies with hose, generally about TWO times the recommended operating pressure for the hose. |
