(d)
Each sump, sediment bowl, and sediment chamber drain required by paragraphs (a), (b), and (c) of this section must comply with the drain provisions of Sec. 23.999(b)(1) and(2).]

Amdt. 23-43, E.. 05/10/93
FAR 23.973 : Fuel tank .ller connection.
(a)
Each fuel tank .ller connection must be marked as prescribed in Sec. 23.1557(c).

(b)
Spilledfuel mustbepreventedfrom entering thefuel tank compartmentoranypart of the airplane other than the tank itself.

(c)
Each .ller cap must provide a fuel-tight seal for the main .ller opening. However, there may be small openings in the fuel tank cap for venting purposes or for the purpose ofallowingpassage of afuelgauge through the capprovided such openings comply with the requirements of Sec. 23.975(a).

(d)
Each fuel .lling point, except pressure fueling connection points, must have a pro-vision for electrically bonding the airplane to ground fueling equipment.

(e)
For airplanes with engines requiringgasoline asthe onlypermissiblefuel,theinside diameter of the fuel .ller opening must be no larger than 2.36 inches.

(f)
[Forairplaneswithturbineengines,theinsidediameterofthefuel .lleropening must be no smaller than 2.95 inches.]

Amdt. 23-51, E.. 03/11/96
FAR 23.975 : Fuel tank vents and carburetor vapor vents.
(a)
Eachfueltank mustbe ventedfrom the toppart of the expansion space.In addition–

(1)
Each vent outlet must be located and constructed in a manner that minimizes thepossibility ofitsbeing obstructedby ice or otherforeign matter;

(2)
Each vent must be constructed to prevent siphoning of fuel during normal operation;

(3)
The venting capacity must allow the rapid relief of excessive di.erences of pressure between the interior and exterior of the tank;

(4)
Airspaces of tanks with interconnected outlets must be interconnected;

(5)
[There maybe no point in any vent line where moisture can accumulate with the airplane in either the ground or level .ight attitudes, unless drainage is provided. Any drain valve installed must be accessible for drainage;]

(6)
No vent may terminate at a point where the discharge of fuel from the vent outlet will constitute a .re hazard or from which fumes may enter personnel compartments; and

(7)
Vents must be arranged to prevent the loss of fuel, except fuel discharged becauseof thermal expansion,whenthe airplaneisparkedin anydirectionon a ramp having a one-percent slope.

(b)
Each carburetor with vapor elimination connections and each fuel injection engine employing vapor return provisions must have a separate vent line to lead vapors back to the top of one of the fuel tanks. If there is more than one tank and it is necessary to use these tanks in a de.nite sequence for any reason, the vapor vent line must lead back to the fuel tank to be used .rst, unless the relative capacities of the tanks are such that return to another tank is preferable.

(c)
For acrobatic category airplanes, excessive loss of fuel during acrobatic maneuvers, including shortperiodsofinverted .ight,mustbeprevented.Itmustbeimpossible for fuel to siphon from the vent when normal .ight has been resumed after any acrobatic maneuver for which certi.cation is requested.

Amdt. 23-51, E.. 03/11/96
FAR 23.977 : Fuel tank outlet.
(a) There must be a fuel strainer for the fuel tank outlet or for the booster pump. This strainer must–
(1)
For reciprocating enginepowered airplanes,have8 to 16 meshesper inch; and

(2)
For turbine engine powered airplanes, prevent the passage of any object that could restrict fuel .ow or damage any fuel system component.

′
Elodie Roux. Septembre 2003
Subpart E : Powerplant
(b)
The clear area of each fuel tank outlet strainer must be at least .ve times the area of the outlet line.
　
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本文鏈接地址：FAA規章 美國聯邦航空規章 Federal Aviation Regulations 2(61)