Fuel tank filler connection.

CFR · 2024-01-01 · US · Title 14

Each fuel tank filler connection must prevent the entrance of fuel into any part of the airplane other than the tank itself. In addition— (a) [Reserved] (b) 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; (c) Each filler cap must provide a fuel-tight seal; and (d) Each fuel filling point must have a provision for electrically bonding the airplane to ground fueling equipment.

official document · source cfr-2024 · id 14:§ 25.973