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20 Cards in this Set
- Front
- Back
What are the two types of fluid lines commonly found in aircraft
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RIGID metal lines and FLEXIBLE lines
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Describe the method of classifying metal tube according to size
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Wall thickness and OUTSIDE diameter measured in 1/16th increments
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When installing stainless steel tubing what type of fitting should be used
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STAINLESS STEEL FITTINGS
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What is the function of the sleeve on a flared tube fitting
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The nut fits over the sleeve and draws the sleeve and the tubing flare tightly against the male fitting to form the seal
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Describe the two types of flares commonly used on aircraft tubing
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Single flare & Double flare
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How can you determine if a fitting is an AN type rather than an AC type
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AN fittings have a shoulder between the flare cone and the end of the threads.
AC fittings do not. |
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What are the most significant differences between AN and A/C fittings
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Sleeve length, Thread pitch, and the shoulder between the thread and the flare cone on AN fittings.
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What are the names of the parts of a flareless tube fitting?
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the nut & the ferrule ( SLEEVE )
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How do you tell a flareless fitting from a flare type fitting
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Flareless fittings dont have a flare cone and there is no space between the threads and the end of the fitting
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What is the effect of over tightening a flare-type fitting?
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the sealing surface may be damaged or the flare cut off
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In addition to being securely clamped what is an additional requirement for installing metal fuel, oil, and hydraulic lines?
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The lines must be electrically bonded to the structure
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What are some of the important advantages of Teflon tubing
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1. It is compatible with nearly every liquid
2. has a broad operating temperature range 3. low resistance to fluid flow 4. has a very long shelf and service life |
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Describe identification markings commonly found on flexible hoses
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1. A LAY LINE
2. identification such a MIL-SPEC number 3. the manufacturer name or symbol 4. the hose Size and Data code. |
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How can you determine if a flexible hose has been correctly or incorrectly installed
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The Lay Line will be Straight if the hose is properly installed. A twisted lay line indicates incorrect installation
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How are flexible hose sizes designated
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By the INSIDE DIAMETER in 1/16ths increments
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What precautions must be observed when deburring the end of a tube after it is cut
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The wall thickness must not be reduced in size or fractured
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Describe the operation of quick disconnect couplings
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Each half has a valve that is held open when coupled and is spring loaded closed when disconnected.
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If you fabricate a replacement for a flexible hose what percentage of the total length must be added to allow for movement under pressure
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5 to 8 percent
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What happens to the tube when a flareless fitting is overtightened
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The tube is weakened when the nut drives the cutting edge of the sleeve too deeply into the tube
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Why are quick disconnect fittings used
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To provide a quick means to connect or disconnect a fluid line without loss of fluid or entrance of air into the system
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