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16 Cards in this Set
- Front
- Back
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of what material are most low pressure rigid fluid lines made of |
1100–1/2 hard or 3003–1/2 hard aluminum alloy tubing
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the size of a rigid fluid line its determined by |
its outside diameter
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when routing a fluid line parallel to an electrical wire bundle, which should be on top
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the electrical wire bundle
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how can you distinguish an AN fluid line fitting from an AC fitting
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the AN fitting has a shoulder between the end of the flare cone and the first thread. the threads of an AC fitting extend all the way to the flare cone
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how tight should an MS flareless fitting be tightened |
by hand until its snug, and then turn with a wrench for 1/6 turn to a 1/3 turn. never turn it more than a 1/3 turn with a wrench
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What damage can be caused by overtightening an MS flareless fitting?
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overtightening drives the cutting edge of the sleeve deep into the tube and weakens it
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What kind of ridged tubing can be flared with a double flare?
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5052-O and 6061-T aluminum alloy tubing in sizes from 1/8in to 3/8in OD
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Of what material should rigid fluid lines be made that carry high-pressure (3,000psi or greater) hydralic fluid?
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Annealed or 1/4-hard corrosion-resistant steel
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What is the difference between the flare angle for aircraft and automotive?
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aircraft fittings have a 37 degree flare angle and automotive fittings use 45 degree
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What should be done to the end of a tube that is to be flared?
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The cut end should be polished to remove any sharp edges that could cause the tubing to crack
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what is the function of the lay line (the identification stripe) that runs the length of the flexible hose
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the line shows the mechanic whether or not the line has been twisted when it was installed. the line should be straight, not spiraled
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where are quick disconnect fluid line couplings normally used in an aircraft hydraulic system
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quick disconnect couplings are normally used where the engine driven pump connects to the hydraulic system
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is the size of a flexible hose determined by its inside or outside diameter
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inside diameter
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what is the minimum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system
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at least 5% longer than the distance between the fittings. this provides the needed slack
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what is the principal advantage of teflon hose for use in an aircraft hydraulic system
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teflon hose retains its high strength under conditions of high temperature
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how much pressure is used to proof test a flexible hose assembly
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this varies with the hose but it is generally about two times recommended operating pressure for the hose |
