MIL-STD-1518E
5.2 Operations.
5.2.1 Fuel tanks with water bottoms. The use of fuel tanks with water bottoms is prohibited. Fuel storage tanks shall have sumps for collection and draining of accumulated water. These sumps shall be checked and drained daily or prior to issue and more often where heavy rainfall is experienced and the storage tanks are of the open floating roof design.
5.2.2 Tank product change. A change of the type product (from aviation gasoline to jet fuel, or vice versa) does not in itself require tank cleaning. Refer to para 5.1.4 for tank cleaning requirements. Removal of all previous product is required prior to introducing the new product in tank.
5.2.3 Settling time. After each receipt or tank fill by any transportation mode, a minimum of two hours settling time is required prior to product transfer. Product received through a filter separator into a coated tank may be issued prior to two hours settling time if it is free of sediment and water.
5.2.4 Servicing of drummed product. Drums containing aviation fuel shall be stored on their sides, bung side up when not in use. Aviation fuel issued from drums to a refueling truck or directly to an aircraft must pass through a filter separator.
5.2.5 Positioning equipment. Fuel servicing vehicles shall not be driven closer than 8 meters (25 feet) from an aircraft unless a spotter is used to direct vehicle movement. Under no circumstances shall the vehicles be positioned closer than 3 meters (10 feet) from the aircraft. Refuelers shall be positioned so the operator's side of the equipment is adjacent to the aircraft. Always maintain a clear path from the aircraft for rapid evacuation of vehicles in an emergency situation.
5.2.6 Bonding and grounding. Bonding and grounding of aircraft during fuel servicing shall be as required by T.O. 00-25-172 and the specific aircraft technical data. Should a conflict occur, the aircraft specific technical data guidance shall be utilized.
5.2.7 Single point refueling. Single point (underwing) refueling pressure shall not exceed 55 psi
(380kPa) or the pressure specified by the specific aircraft technical data, whichever is lower.
5.2.8 Line displacing procedures. Displace fuel in pipeline systems if the system is inactive for over 30 days. Such action shall preclude the deterioration of fuel and protect against corrosion. Quantity to be displaced is twice the contents of the pipeline.
5.2.9 Handling of lubricants and hydraulic fluids.
5.2.9.1. General requirements:
a. Aircraft engine oils, lubricants, and hydraulic fluids shall not be stored outside unprotected from the elements. All containers shall be properly stored and handled to protect the containers and prevent contamination of the tops, openings, and contents.
b. Drums of aircraft oils and hydraulic fluid will be stored on their sides with bungs flooded prior to opening. After opening, drums will be stored indoors or protected from external contamination with appropriate covers to prevent contamination of the openings and contents. When not in actual use, all openings to the drum will be tightly closed. Servicing nozzles will be protected from contamination by use of caps, plastic covers or other similar devices.
c. When opening cans of aircraft engine oils and hydraulic fluids, proper opening devices (specifically designed for such purpose) shall be used in all cases to prevent contamination. Maintenance tools such as screwdrivers, punches, etc., shall not be used to open cans. Opening devices shall be protected from contamination by storing in a plastic bag or similar devices when not in use.
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