Chapter 10

What are the two types of fluids lines commonly found in aircraft
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What are the two types of fluids lines commonly found in aircraft
Rigid metal lines and flexible hoses
Describe the method of classifying metal tube according to size.
Metal tubing is sized according to wall thickness and outside diameter. Outside diameter is measuted in 1/16th inch increments
When installing stainless steel tubing, what type of fittings should be used?
Stainless steel fittings
What is the function of the sleeve on a flared-tube fitting
The nut fits over the sleeve and draws the sleeve and the tubing flare tightly against the make fitting to form the seal.
Describe the two types of flares commonly used on aircraft tubing
The single flare and the double flare.
How can you determine if a fitting is an AN type rather than an AC type?
AN fitting have a shoulder between the flare cone and the end of the threads, AC fittings do not
What are the most significant difference between AN and AC fittings?
Sleeve length, thread pitch, and the shoulder between the threads and the flare cone on AN fittings.
What are the names of the parts of a flare less tube fittings
The nut and the ferrule or sleeve
How do you tell a flareless fitting from a flare-type fittings
Flareless fittings don't have a flare cone and there is no space between the threads and the end of the fitting
What is the effect of over tightening a flare type fitting
The sealing surface may be damaged or the flare cut off
In addition to being securely clamped, what is an additional requirement for installing metal fuel, oil and hydraulic linesThe lines must be electrically bonded to the structureWhat are some of the important advantages of Teflon tubingIt is compatible with nearly every liquid, has a broad operating temperature range, low resistance to fluid flow and has a very long shelf and service life.Describe the identification markings commonly found on flexible hosesA lay line, identification such as a mil spec number, the manufactures name or symbol, the hose size and a date codeHow can you determine if a flexible has been correctly or incorrectly installed?The lay line will be straight if the hose is properly installed, A twisted lay line indicates an incorrect installationHow are flexible hose sizes designatedBy the inside diameter, measured in 1/16th inch increments.What precautions must be observed when deburring the end of a tube after it is cut?The wall thickness must not be reduced in size or fracturedDescribe the operation of quick disconnect couplingsEach half has a valve that is held open when coupled and is spring loaded closed when disconnectedIf you fabricate a replacement for a flexible hose, what percentage of the total length must be added to allow for movement under pressure5 to 8 percentWhat happens to the tube when a flare-less fitting is overtightenedThe tube is weakened when the nut drives the cutting edge of the sleeve too deeply into the tubeWhy are quick disconnect fittings used?To provide a quick means to connect or disconnect a fluid line without loss of fluid or entrance of air into the system