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GENERAL
J FLUID LINES AND FITTINGS
| Question | Answer |
|---|---|
| What are the two types of fluid 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 measured 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 male 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 fittings have a shoulder between the flare cone and the end of the threads, AC fittings do not |
| What are the most significant differences 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 flareless tube fitting? | The nut and the ferrule or sleeve. |
| How do you tell a flareless fitting from a flare-type fitting? | - 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 lines? | The lines must be electrically bonded to the structure. |
| What are some of the important advantages of Teflon tubing? | It 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 hoses. | A lay line, identification such as a Mil Spec number, the manufacturer's name or symbol, the hose size and a date code. |
| . How can you determine if a flexible hose 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 installation. |
| How are flexible hose sizes designated? | By the inside diameter, measured in 1116th 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 fractured. ( |
| . Describe the operation of quick disconnect couplings. | - Each half has a valve that is held open when coupled and is spring-loaded closed when disconnected. |
| . If you fabricate a replacement for a flexible hose, what percentage of the total length must be added to allow for movement under pressure? | - 5 to 8 percent. ( |
| What happens to the tube when a flareless fitting is overtightened? | - The tube is weakened when the nut drives the cutting edge of the sleeve too deeply into the tube. |
| Why 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. |
Created by:
S_A_J