Wednesday, June 10, 2015

FUEL TANK CAPS, VENTS, AND OVERFLOW LINES.

FUEL TANK CAPS, VENTS, AND OVERFLOW LINES.

Inspect the fuel tank caps to determine they are the correct type and size for the installation, and that "O" rings are in good condition.

a.            Unvented caps, substituted for vented caps, will cause fuel starvation and possible collapse of the fuel tank or cell. Malfunction­ing of this type occurs when the pressure within the tank decreases as the fuel is with­drawn. Eventually, a point is reached where the fuel will no longer flow, and/or the outside atmospheric pressure collapses the tank. Thus, 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 manufac­turer's service instructions. Inspect for cracked or deteriorated filler opening recess drains, which may allow spilled fuel to accu­mulate 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, inves­tigate condition of the line and purge any ex­cess fuel from the wing.

c.            Assure that filler opening markings are affixed to, or near, the filler opening; marked according to the applicable airworthi­ness requirements; and are complete and legi­ble.

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