(a) Method 1: equipment is grounded to a rod or rods that have measured resistance to ground
equal to or less than 10,000 ohms. Ground the refueling system or vehicle and aircraft to this tested ground
rod. Bond the nozzle to the vehide/aircraft. This method is required, unless conditions, as described below,
prevent its use. This method is the only standard of grounding acceptable, without authorization, at any fixed
airfield or refueling point. It is the safest method.
(b) Method 2: If equipment is not available to test resistance to ground, use method 2. Method 2
uses an untested ground - a grounding system based on the knowledge that damp earth will accept and drain
off an electrical charge. Use method 2 when the location, tactical situation, or type of operation makes it
impossible to test ground rods. Ground equipment to a rod or rods driven a specific depth into the ground
depending on the type of soil at the site (see table 2-2). The depth to which the rods must be driven is
determined by the normal depth of permanent ground moisture in the various types of soils. The commander of
the operating unit must authorize the use of method 2. This method is less desirable. Employ method 2 when
impossible to use method 1.
Death or serious injury may occur if proper bonding procedures are not
followed. While using method 3, an object with a different electrical
potential (any object that is not part of the bonded system) should not
come into contact with the bonded equipment when a flammable vapor-air
mixture may be present.
(c) Method 3: When the climate, terrain, or tactical condition makes it impossible to secure a
satisfactory ground rod, requirements to ground the fuel dispenser (system or refueler) maybe waived;
however, the requirement to bond the fuel dispenser to the aircraft/vehicle may not be waived under
any circumstances. Method 3 relies on bonding alone (see paragraph 2-12b ). Bonding is made between the
aircraft/vehicle and the refueling system or refueler along with the nozzle and the aircraft/vehicle. A contact
between an unbended object and the system could produce a spark that could set off an explosion or fire.
Method 3 procedures are authorized by the commander of the unit one organizational level above the operating
unit. This is the least desirable method since it involves bonding only.
c. Open only the manhole cover fill plug of the tank being filled. Do not fill two tanks at the same time
unless operator has an assistant. If fuel is spilled, wash the area of spillage thoroughly with water.
(1) The tank and pump unit is used to dispense automotive, aviation and burner fuel. However, only
one grade of fuel should be carried in and dispensed from the unit at a time. Since the pumping assembly is
highly adaptable, dispensing with the tank and pump unit may be done in a variety of ways to meet different
situations in the field. The following paragraphs cover some common operational procedures for the tank and
pump unit in the field (see figures 2-1 and 2-2).