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Only turbine engine helicopters fueled with JET A or JET A-1 fuels shall be permitted to be fueled while an onboard engine is operating. Helicopters permitted to be fueled while an onboard engine is operating shall have all sources of ignition of potential fuel spills located above the fuel inlet port(s) and above the vents or tank openings. Ignition sources shall include, but shall not be limited to, engines, exhausts, auxiliary power units (APUs), and combustion-type cabin heater exhausts. [407:5.21.1]
Helicopter fueling while onboard engines are operating shall be permitted only under the following conditions:
  1. An FAA-licensed helicopter pilot shall be at the aircraft controls during the entire fuel servicing process.
  2. *Passengers shall be deboarded to a safe location prior to rapid refueling operations. Where the pilot in command deems it necessary for passengers to remain onboard for safety reasons, the provisions of shall apply.
  3. Passengers shall not board or deboard during rapid refueling operations.
  4. Only designated personnel, properly trained in rapid refueling operations, shall operate the equipment. Written procedures shall include the safe handling of the fuel and equipment.
  5. All doors, windows, and access points allowing entry to the interior of the helicopter that are adjacent to, or in the immediate vicinity of, the fuel inlet ports shall be closed and shall remain closed during refueling operations.
  6. Fuel shall be dispensed into an open port from approved deadman-type nozzles, with a flow rate not to exceed 60 gpm (227 L/min), or it shall be dispensed through close-coupled pressure fueling ports. Where fuel is dispensed from fixed piping systems, the hose cabinet shall not extend into the rotor space. A curb or other approved barrier shall be provided to restrict the fuel servicing vehicle from coming closer than within 10 ft (3 m) of any helicopter rotating components. If a curb or approved barrier cannot be provided, fuel servicing vehicles shall be kept 20 ft (6 m) away from any helicopter rotating components, and a trained person shall direct fuel servicing vehicle approach and departure. [407:5.21.2]