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(a) When an aircraft engine is running; <br />(b) When an aircraft is being warmed by <br />application of exterior heat; <br />(c) Inside a hangar or an enclosed area; <br />(d) While an aircraft radio transmitter or <br />receiver is being operated, or other electrical appli- <br />ances are switched on or'off; <br />(e) When there are people aboard the aircraft <br />unless the aircraft door is open, there is an attendant <br />at the door, and a passenger loading stand is at the <br />cabin door; or <br />(f) From drums, small containers, or similar <br />items. <br />5.4.2 Particular Restrictions. <br />5.4.2.1. Fuel storage and servicing equipment, including <br />fuel servicing vehicles, fueling pumps, meters, hoses, nozzles, <br />fire extinguishers and grounding devices shall be UL approved <br />where applicable, shall comply with state laws and regulations, <br />and shall be kept in first class non-leaking condition at all <br />times. <br />5.4.2.2. A fuel servicing vehicle, including tank trucks <br />and tank semi-trailers, when servicing. an aircraft, must be posi- <br />positioned: <br />(a) So as to not interefere with the discharge <br />of persons from the aircraft during an emergency; and <br />(b) So that it can be readily driven forward <br />to w n open area during an emergency. <br />5.4.2.3. Fuel servicing vehicles will proceed slowly <br />with caution on the apron. <br />5.4.2.4. A fueling operations attendant shall be fully <br />trained and competent to operate the. emergency pump controls. <br />5.4.2.5. Prior to fueling an aircraft the fuel dispensing <br />equipment shall be grounded to a point or points of zero electri- <br />cal potential in the order indicated below, and when complete, in <br />the reverse order to prevent the possibility of static ignition <br />of volatile liquids: <br />(a) Refueling unit to ground, <br />(b) Refueling unit to aircraft. <br />Rules - 13 <br />