recirculated long enough to flush out all piping down- stream of the fuel monitor elements. 17. Check the operation of the pump. Listen for unusual sounds and feel for overheating and/or abnor- mal vibrations. 18. Obtain a nozzle sample and visually inspect it for color, water, and solids. Record the results. 19. With the system recirculating, observe and re- cord the pressure drop across the filter/separator and the monitor. Weekly Checks The weekly check is performed by a senior opera- tor or fuel shop personnel. The weekly inspection is also required to be performed on equipment being returned to service following any DOWN time that exceeds 72 hours. The typical weekly inspection checklist is as follows: 1. Complete items 1 through 17 on the daily check- list. the CFD and FWD. Log the results in the appropriate laboratory log. 3. Clean and inspect all nozzle screens (pressure and overwing). 4. Inspect tires, brakes, horn, windshield wipers, steering, trainer coupling and electrical wiring. The brake linings and/or pads must be checked by normal application of the brake while observing pedal travel. Test the emergency brake under drive conditions. Make sure all electrical wiring outside of the cab is encased in tubing that terminates in securely mounted vapor-tight fixtures or junction boxes with compression fittings. The use of a transportation inspector is recommended for these checks. 5. Measure and record the pressure drop across the filter/separator and the fuel monitor using a sensitive, hand-held pressure gage accurate to 1 psi, with gradu- ations in 1 psi, or smaller, units, This measurement MUST be taken with the system operating under normal flow conditions. Monthly Checks The monthly checks require special equipment and moving of mobile equipment to a location other than the operating area. The typical monthly checklist is as follows: 1. Complete the daily and weekly checklists. 2. Check the continuity of grounding cables, bond- ing cables, and reels. Continuity must be measured with the cable in the stowed, intermediate, and fully extended positions. Check the continuity of the grounding cable on each overwing fueling nozzle. 3. Inspect and clean all line strainers, including the meter strainers when installed. 4. Test the anti-driveaway device installed on all refuelers. 5. Perform the engine spark check at night. The purpose of this check is to locate any electrical arcing over the outside surfaces of wiring, spark plugs, and the like. Any auxiliary engines should be included in the test. Any observed arcing—however slight—is suffi- cient cause to remove the equipment from service. 6. Test maximum flow rate. If pressure tests indi- cate that nozzle pressure exceeds 55 psi or that the flow rate exceeds 600 gpm, the equipment must be removed from service. 7. Test the primary pressure-control system. 8. Check the refueling adapters (receptacles), us- ing the go/no-go gage. 9. Make sure fuel-handling equipment is marked in accordance with NAVFAC P-300 or MIL-STD-161. Periodic Inspection and Annual Record The Periodic Inspection and Annual Record pro- vides an important historical record for each piece of refueling equipment. It is a written record of inspec- tions, calibrations, element changes, and other main- tenance actions performed through the year. As with other checklists, this record may be tailored to meet the requirements of each station. Filter/Separator—Fuel-Monitor Pressure Log and Graph The pressure drop across each housing must be accurately determined so that the integrity of the ele- ments can be verified. Over time, differential pressure will increase as more and more dirt and/or water is trapped. Additionally, ruptures or breaks are identi- fied by a significant drop in differential pressure. All activities must maintain a log for each filter or moni- tor. Filter and monitor elements in refueling equip- ment or at truck-fill stands are changed every 3 years 7-12