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GENERAL 04
Fluid Lines & Fittings
| Question | Answer |
|---|---|
| What two general types of fluid lines are commonly used in aircraft plumbing? | Metal tubing (rigid fluid lines) and flexible hose |
| How is metal tubing classified in size? | Metal tubing is sized by outside diameter in 1/16 inch increments, and wall thickness. |
| What are the identification markings usually found on flexible rubber hose? | Hose size manufacturer, date of manufacture pressure and temperature limits |
| What caution must be observed when deburring the end of tubing after cutting? | Extreme care that the wall thickness is not fractured or reduced in size |
| What are the parts of a military standard flareless-tube fitting? | A body, a sleeve, and a nut |
| What are the two kinds of flares generally used in aircraft plumbing systems? | The single flare and the double flare |
| What is the principle advantage of flexible Teflon hose? | High operating strength at elevated temperatures. |
| How can you tell that a flexible hose has been installed in a twisted position? | By the identification stripe running along the hose length |
| When fabricating a flexible hose, what percent of the total length must be allowed for freedom of movement under pressure? | From 5 to 8 percent of its total length |
| What happens to a flareless-tube fitting when it is overtightened? | The nut drives the cutting edge of the sleeve deeply into the tube, causing the tube to be weakened |
| What type of fittings (material) should be used with stainless steel tubing? | Stainless steel fittings |
| What is the purpose of a sleeve on a flared-tube connection? | The nut fits over the sleeve and when tightened, draws the sleeve and tubing flare tightly against the male fitting to form the seal |
| When inspecting fittings, how may a flareless fitting be distinguished from a flared tube type? | There is no flare cone and no space between the threads and the end of the fitting |
| How is flared tubing affected by overtightening of the fittings? | The tube flare is likely to be damaged, forming a weak point which may fail when under pressure |
| What percentage of flattening is allowed when bending metal tubing? | Do not exceed 75% of original diameter |
| Scratches and nicks may be repaired if they are less than what percent of the wall thickness? | 10%. |
| Flexible hoses should be clamped at least every how many inches? | 24 inches |
| What is the difference between flare angles for aviation and automotive flares? | Aviation is 37 degrees, Automotive is 45 degrees |
| Name at least two synthetic materials commonly used in the manufacture of flexible hoses. | Buna-N; Neoprene; Butyl, Ethylene propylene Diene Rubber (EPDM); and Teflon |
| What is the maximum interval for repeating the required markings on a flexible hose? | Not more than nine inches along the length of the hose |
| In addition to being securely clamped in place, how should metal, fuel, oil, and hydraulic lines be installed in an aircraft? | They should be electrically connected (grounded to the aircraft structure) |
| When selecting a flexible hose for use in a phosphate ester based hydraulic fluid (Skydrol) system, the hose should be made of which synthetic rubber compound? | Butyl |
| Name at least two considerations when installing flexible hose assemblies. | Slack, flexing, twisting, bending, clearance, and clamps |
Created by:
Chisum
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