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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? |
1100-1/2 hard or 3003-1/2 hard aluminum alloy tubing. |
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Is the size of a rigid fluid line determined by its inside or it’s outside diameter? |
By its outside diameter. |
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When routing a fluid line parallel to an electrical wire bundle, which should be on top? |
The electrical wire bundle should be on top. |
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How can you distinguish an AN fluid line fitting from an AC fitting? |
The AN fitting has a shoulder between the end of the flare cone and the first thread. The threads of the AC fitting extend all the way to the cone. |
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How tight should an MS flareless fitting be tightened? |
Tighten the fitting by hand until it is snug, and then turn it with a wrench for 1/6-turn to 1/3-turn. Never turn it more than 1/3-turn with a wrench. |
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What damage can be caused by overtightening an MS flareless fitting? |
Overtightening drives the cutting edge of the sleeve deep 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 3/9-inch OD. |
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Of what material should rigid fluid lines be made that carry high-pressure (3,000 psi or greater) hydraulic fluid? |
Annealed or 1/4-hard corrosion-resistant steel. |
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What is the difference between the flare angle for aircraft and automotive fittings? |
Aircraft fittings have a 37 degree flare angle and automotive fittings use 45 degrees. |
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What should be done to the end of a tube that is to be flared? |
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? |
To show the mechanic whether or not the line was 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? |
In the lines that connect the engine-driven pump into the hydraulic system. |
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Is the size of the flexible hose determined by its inside or outside diameter? |
By the 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? |
The hose should be at least 5% longer than the distance between the fittings. This extra length provides the needed slack. |
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What is the principal advantage of Teflon hose for use in an aircraft hydraulic system? |
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? |
This varies with the hose, but it is generally about two times the recommended operating pressure for the hose. |
