AIRCRAFT FUELING SYSTEMS

(fig. 7-3) are placed next to all operating accessories such as valves, pumps, regulators, and manifolds. Table 7-1 lists the sizes of bands and letters used for petroleum products. AIRCRAFT FUELING SYSTEMS LEARNING OBJECTIVES: Identify the typical fueling systems used on shore activities. Describe the equipment contained in each system. The following are three typical aircraft fueling systems used on shore activities: • Aircraft Direct-Refueling System (more commonly known as a “pit”). • Mobile Aircraft Refuelers. These are tanker trucks of various capacities and configurations. • Portable Fueling Systems. These are air- transportable, advanced base systems used primarily to support tactical operations. As an ABF, you most likely will never use this type system; therefore, it is not discussed further in this manual. AIRCRAFT DIRECT-REFUELING SYSTEM (PIT) Aircraft direct-refueling systems (fig. 7-4) are designed primarily for “hot” refueling of aircraft. All direct-refueling systems have the following minimum features: Filter/separator. Fuel-quality monitor. Relaxation chamber or equivalent piping configuration capable of providing 30 seconds of static relaxation from point of last filtration to the nozzle. Diaphragm-operated primary control valve. Remote, hand-held, deadman control for each pan- tograph or hose installed at each station. Emergency pump-shutoff switch. Meter on each station outlet. Recirculation/flushing capability of the nozzle and/or hose/pantograph system. Emergency dry-breakaway coupling on each hose or pantograph. Bonding/grounding cable. This requirement is considered satisfied if the fueling hose/pantograph sys- tem has continuity (10,000 ohms or less). Figure 7-3.—Identification for bulk petroleum product lines. 7-6