Fuel system crash resistance.

CFR · 2024-01-01 · US · Title 14

Unless other means acceptable to the Administrator are employed to minimize the hazard of fuel fires to occupants following an otherwise survivable impact (crash landing), the fuel systems must incorporate the design features of this section. These systems must be shown to be capable of sustaining the static and dynamic deceleration loads of this section, considered as ultimate loads acting alone, measured at the system component's center of gravity without structural damage to the system components, fuel tanks, or their attachments that would leak fuel to an ignition source. (a) (1) The drop height must be at least 50 feet. (2) The drop impact surface must be nondeforming. (3) The tanks must be filled with water to 80 percent of the normal, full capacity. (4) The tank must be enclosed in a surrounding structure representative of the installation unless it can be established that the surrounding structure is free of projections or other design features likely to contribute to upture of the tank. (5) The tank must drop freely and impact in a horizontal position ±10°. (6) After the drop test, there must be no leakage. (b) (1) For fuel tanks in the cabin: (i) Upward—4g. (ii) Forward—16g. (iii) Sideward—8g. (iv) Downward—20g. (2) For fuel tanks located above or behind the crew or passenger compartment that, if loosened, could injure an occupant in an emergency landing: (i) Upward—1.5g. (ii) Forward—8g. (iii) Sideward—2g. (iv) Downward—4g. (3) For fuel tanks in other areas: (i) Up

official document · source cfr-2024 · id 14:§ 29.952