MIL-STD-1518E
5.1.6.3 Draining Filter Separator Sumps. Drain all fixed and mobile filter separator vessels under pressure daily when used. Inspect the product drained from the sumps for the presence or water or a thick gelatinous substance.
5.1.7 Differential pressure. Filtration equipment shall be equipped with differential pressure gauges. The differential pressure and flow rate across each micronic filter and filter separator shall be observed and recorded daily when used. Any drop in differential pressure at the same fuel flow rate is cause for concern and shall be cause to stop fuel transfer/servicing operations. The cause of the drop in differential pressure shall be determined and corrective action taken prior to resuming use of the associated dispensing and filtration system.
5.1.8 Pressure gauges. Reliability of pressure and differential pressure gauges is critical to the support of aircraft refueling operations. Gauges employed in this type of service will be in calibration at the start of contract and annually from the calibration date. Piston type pressure differential gauges require no calibration provided the piston returns to zero under no flow conditions. Refer to manufacturer's maintenance manual for troubleshooting and correcting problems that occur with differential gauges. Comply with the following:
a. Verify that accuracy of gauges used to monitor fuel delivery to aircraft is within +/- 2% of full
scale.
b. Verify proper operation of filter differential gauge(s) in accordance with gauge manufacturers' procedures. Accuracy must be within +/- 2 PSI.
c. Replace, or repair and calibrate defective gauges.
5.1.9 Meters. Meters shall be used for quantity determination of fuel delivered to aircraft. Meters shall be calibrated to an accuracy of ± ½ gallon per 100 gallons dispensed. Meters shall be calibrated at the start of contract and annually from the calibration date.
5.1.10 Hoses and couplings. Fuel hoses and couplings shall comply with the requirements of
IE 1529 or BS EN ISO 1825.
5.1.11 Aircraft refueling nozzles. Two types of aircraft refueling nozzles are in use: gravity refueling (also known as overwing refueling nozzles) and single point refueling (also known as pressure or underwing refueling nozzles). All aircraft refueling nozzles shall be equipped with 40 mesh or finer screens that can be readily removed for inspection or cleaning. Aircraft refueling nozzle screens shall be removed, inspected and cleaned monthly. Single point nozzles shall meet the requirements of SAE AS5877 and mate to the standard aircraft fueling receptacle (MS24484).
5.1.12 Identification markings.
5.1.12.1 Fuel handling equipment. Fixed and mobile equipment shall be marked in accordance with IE 1542 or MIL-STD-161.
5.1.12.2 Packaged products. All packaged lubricating products and hydraulic fluids are marked and identified at origin to indicate name of manufacturer, origin, nomenclature and grade, specification, batch and QPL number, lot number, date filled and NSN. Product not identified in this manner will not be serviced to government aircraft.
5.1.13 Continuity resistance. The electrical continuity of bonding reels and/or cable assemblies utilized during fuel related operations shall be checked with a voltage/ohm meter (multi-meter) at the beginning of the contract period and every six months thereafter. Resistance, of cables (measured from plug/clamp to plug/clamp) and reels on servicing units,( measured from the plug/clamp on the cable to the frame of the refueling equipment) shall be 10 ohms or less.
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