(a) Each fueling connection below the fuel level in each tank must have
means to prevent the escape of hazardous quantities of fuel from that tank
in case of malfunction of the fuel entry valve.
(b) For systems intended for pressure refueling, a means in addition to
the normal means for limiting the tank content must be installed to
prevent damage to the tank in case of failure of the normal means.
(c) The rotorcraft pressure fueling system (not fuel tanks and fuel
tank vents) must withstand an ultimate load that is 2.0 times the load
arising from the maximum pressure, including surge, that is likely to
occur during fueling. The maximum surge pressure must be established with
any combination of tank valves being either intentionally or inadvertently
closed.
(d) The rotorcraft defueling system (not including fuel tanks and fuel
tank vents) must withstand an ultimate load that is 2.0 times the load
arising from the maximum permissible defueling pressure (positive or
negative) at the rotorcraft fueling connection.