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AC 43.13-1B CHG 1 9/27/01 fabricated as described in figure 9-8. Refer to figure 9-10 for minimum bend radii. When a hose assembly is removed, the ends should be tied as shown in figure 9-11, so that the pre formed shape will be maintained. Refer to figure 9-12 for minimum bend radii for teflon hose. (3) All flexible hose installations should be supported at least every 24 inches. Closer supports are preferred. They should be care fully routed and securely clamped to avoid abrasion, kinking, or excessive flexing. Ex cessive flexing may cause weakening of the hose or loosening at the fittings. e. O-Ring Seals. An understanding of O- ring seal applications is necessary to determine when replacement should be made. The sim plest application is where the O-ring merely serves as a gasket when it is compressed within a recessed area by applying pressure with a packing nut or screw cap. Leakage is not normally acceptable in this type of instal lation. In other installations, the O-ring seals depend primarily upon their resiliency to ac complish their sealing action. When moving parts are involved, minor seepage may be normal and acceptable. A moist surface found on moving parts of hydraulic units is an indi cation the seal is being properly lubricated. In pneumatic systems, seal lubrication is pro vided by the installation of a grease- impregnated felt wiper ring. When systems are static, seepage past the seals is not nor mally acceptable. f. Storage of replacement seals. (1) Store O-ring seals where tempera ture does not exceed 120° F. (2) Keep seals packaged to avoid expo sure to ambient air and light, particularly sun light. g. During inspection, consider the fol lowing to determine whether seal replacement is necessary. (1) How much fluid is permitted to seep past the seals? In some installations minor seepage is normal. Refer to the manufacturer’s maintenance information. (2) What effect does the leak have on the operation of the system? Know the sys tem. (3) Does the leak of fluid create a haz ard or affect surrounding installations? A check of the system fluid and a knowledge of previous fluid replenishment is helpful. (4) Will the system function safely without depleting the reservoirs until the next inspection? h. Do’s and Don’ts that apply to O-ring seals. (a) Correct all leaks from static seal installations. (b) Don’t retighten packing gland nuts; retightening will, in most cases, increase rather than decrease the leak. (c) Never reuse O-ring seals because they tend to swell from exposure to fluids, and become set from being under pressure. They may have minor cuts or abrasions that are not readily discernible by visual inspection. (d) Avoid using tools that might damage the seal or the sealing surface. (e) Do not depend upon color-coding. Coding may vary with manufacturer (f) Be sure that part number is correct (g) Retain replacement seals in their package until ready for use. This provides proper identification and protects the seal from damage and contamination. (h) Assure that the sealing surfaces are clean and free of nicks or scratches before installing seal. Page 9-20 Par 9-30PDF Image | AFS-640
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