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9/8/98 AC 43.13-1B the effects will occur sooner with a full fuel tank than with one partially filled. b. Check tank vents and overflow lines thoroughly for condition, obstructions, correct installation, and proper operation of any check valves and ice protection units. Pay particular attention to the location of the tank vents when such information is provided in the manufac- turer’s service instructions. Inspect for cracked or deteriorated filler opening recess drains, which may allow spilled fuel to accu- mulate within the wing or fuselage. One method of inspection is to plug the fuel line at the outlet and observe fuel placed in the filler opening recess. If drainage takes place, inves- tigate condition of the line and purge any ex- cess fuel from the wing. c. Assure that filler opening markings are affixed to, or near, the filler opening; marked according to the applicable airworthi- ness requirements; and are complete and legi- ble. 8-34. FUEL CROSS-FEED, FIREWALL SHUTOFF, AND TANK SELECTOR VALVES. Inspect these valves for leakage and proper operation as follows. a. Internal leakage can be checked by placing the appropriate valve in the “off” posi- tion, draining the fuel strainer bowl, and ob- serving if fuel continues to flow into it. Check all valves located downstream of boost pumps with the pump(s) operating. Do not operate the pump(s) longer than necessary. b. External leakage from these units can result in a severe fire hazard, especially if the unit is located under the cabin floor or within a similarly-confined area. Correct the cause of any fuel stains associated with fuel leakage. c. Selector Handles. Check the operation of each handle or control to see that it indicates the actual position of the selector valve to the placard location. Movement of the selector handle should be smooth and free of binding. Assure that stops and detents have positive ac- tion and smooth operational feel. Worn or missing detents and stops can cause unreliable positioning of the fuel selector valve. d. Worn Linkage. Inaccurate positioning of fuel selector valves can also be caused by worn mechanical linkage between the selector handle and the valve unit. An improper fuel valve position setting can seriously reduce en- gine power by restricting the available fuel flow. Check universal joints, pins, gears, splines, cams, levers, etc., for wear and exces- sive clearance which prevent the valve from positioning accurately or from obtaining fully “off” and “on” positions. e. Assure that required placards are complete and legible. Replace those that are missing or cannot be read easily. 8-35. FUEL PUMPS. Inspect, repair, and overhaul boost pumps, emergency pumps, auxiliary pumps, and engine-driven pumps in accordance with the appropriate manufac- turer’s instructions. 8-36. FUEL FILTERS, STRAINERS, AND DRAINS. Check each strainer and filter element for contamination. Determine and correct the source of any contaminants found. Replace throw-away filter elements with the recommended type. Examine fuel strainer bowls to see that they are properly installed ac- cording to the direction of the fuel flow. Check the operation of all drain devices to see that they operate properly and have positive shutoff action. Par 8-33 Page 8-21PDF Image | AFS-640
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