§ 25.973 - Fuel tank filler connection.

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Each fuel tank filler connection must prevent the entrance of fuel into any part of the airplane other than the tank itself. In addition—

[Reserved]

Each recessed filler connection that can retain any appreciable quantity of fuel must have a drain that discharges clear of each part of the airplane;

Each filler cap must provide a fuel-tight seal; and

Each fuel filling point must have a provision for electrically bonding the airplane to ground fueling equipment.