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9/8/98 AC 43.13-1B 8-30. GENERAL. Maintain, service, and adjust aircraft fuel systems and fuel system components in accordance with the applicable manufacturer’s maintenance instructions. Certain general fuel system maintenance prin- ciples are outlined in the following para- graphs.. 8-31. FUEL LINES AND FITTINGS. When fuel system lines are to be replaced or repaired, consider the following fundamentals in addition to the applicable airworthiness re- quirements. Additional inspection and repair practices for aircraft tubing systems may be found in the Chapter 9, Aircraft Systems and Components. a. Compatibility of Fittings. All fittings are to be compatible with their mating parts. Although various types of fittings appear to be interchangeable in many cases they have dif- ferent thread pitch or minor design differences which prevent proper mating and may cause the joint to leak or fail. b. Routing. Make sure that the line does not chafe against control cables, airframe structure, etc., or come in contact with electri- cal wiring or conduit. Where physical separa- tion of the fuel lines from electrical wiring or conduit is impracticable, locate the fuel line below the wiring and clamp it securely to the airframe structure. In no case should wiring be supported by the fuel line. c. Alignment. Locate bends accurately so that the tubing is aligned with all support clamps and end fittings and is not drawn, pulled, or otherwise forced into place by them. Never install a straight length of tubing be- tween two rigidly-mounted fittings. Always incorporate at least one bend between such fit- tings to absorb strain caused by vibration and temperature changes. d. Bonding. Bond metallic fuel lines at each point where they are clamped to the structure. Integrally bonded and cushioned line support clamps are preferred to other clamping and bonding methods. e. Support of Line Units. To prevent possible failure, all fittings heavy enough to cause the line to sag should be supported by means other than the tubing. f. Support clamps. (1) Place support clamps or brackets for SECTION 2. FUEL SYSTEMS metallic lines as follows. Tube O.D. Approximate distance between supports 1/8”-3/16”--------------------------------- 9” 1/4”-5/16”--------------------------------- 12” 3/8”-1/2”----------------------------------- 16” 5/8”-3/4”----------------------------------- 22” 1”-1 1/4”----------------------------------- 30” 1 1/2”-2”----------------------------------- 40” (2) Locate clamps or brackets as close to bends as possible to reduce overhang. (See figure 8-12.) Par 8-30 Page 8-19 8-32. FUEL TANKS AND CELLS. Welded or riveted fuel tanks that are made of commercially pure aluminum, 3003, 5052, or similar alloys, may be repaired by welding. Tanks made from heat-treatable aluminum al- loys are generally assembled by riveting. In case it is necessary to rivet a new piece in a tank, use the same material as used in the tank undergoing repair, and seal the seams with a compound that is insoluble in gasoline. Spe- cial sealing compounds are available and should be used in the repair of tanks. Inspect fuel tanks and cells for general condition, secu- rity of attachment, and evidence of leakage. Examine fuel tank or cell vent line, fuel line, and sump drain attachment fittings closely.PDF Image | AFS-640
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