Filter/separators. Fuel-quality   monitor. Relaxation  chambers. Pressure and differential  pressure  gages. Meter  (temperature-compensating  meters  are  de- sired). Approved  aircraft-refueling  hoses. Dry-break  quick-disconnect  coupling. Hose-end  pressure  regulator. Approved  aircraft-refueling  nozzles. NOTE Refueler/defuelers  have  two  sepa- rate  hose/pressure  nozzle  assemblies: one includes a hose end pressure regu- lator  (for  refueling  service)  and  the other  doesn’t  (for  defueling  opera- tions). Bonding  cable. Aircraft  fuel  servicing  vehicles  must  have  at  least two fire extinguishers installed: One must be on the left front (driver’s) side, readily accessible from the operator  (refueler  control  panel)  position.  The  other extinguisher must be on the right rear portion of the vehicle. Remote, hand-held deadman control. Tires are of a non-FOD type, with slick tread or wide-lug,  wide-groove  tread.  The  tread  must  NOT have a narrow groove design, in which small stones and foreign matter could become imbedded and deposited on airfield surfaces. Recaps and slicks are not authorized for use on the steering wheels when the vehicle is operated off base. The exhaust of all engines, including auxiliary en- gines, must have a suitable spark arrestor. Refuelers/Defuelers The most ideal and cost-effective method of han- dling  non-suspect  defueled  aviation  turbine  fuel  is  to reissue it to an aircraft. Most facilities that handle size able quantities of such fuel have designated one or more  aircraft  refueling  trucks  as  “refueler/defuelers.” In addition to the requirements for refuelers, refu- eler/defuelers  must  also  meet  the  following  minimum requirements: · Refuel/defuel  trucks  carry  the  marking  “JET FUEL/JP” in place of the normal markings (for exam- ple, “JP-5 JET FUEL F-44” or “JP-4 JET FUEL F-40”). · A  dedicated  defuel  connection  to  piping  system that  passes  the  fuel  through  the  pump,  falter/separator, monitor, and relaxation chamber before it enters the tank. · Separate hose and nozzle assemblies provided on refuel/defuelers for each of the two different opera- tions, refueling and defueling. · Maximum defuel is 100 gpm. · High-level alarm. A high-level cutoff system is also  highly  recommended. Defuelers Defuelers  are  used  for  defueling  only.  Fuel  placed in  a  defueler  is  not  to  be  directly  reissued  into  an aircraft;  since  the  defueler  is  generally  configured without filtration equipment, the fuel placed in a de- fueler unit is often suspect. Fuel in a defueler must be sampled  and  tested  to  determine  disposition. CAUTION Hose  evacuation  systems  must  NOT  be used  for  defueling. Defuelers must have the following minimum re- quirements: · A centrifugal pump with the maximum defuel rate of 100 gpm · A cutoff or alarm system for overfill protection · A defuel hose and nozzle PREVENTIVE   MAINTENANCE PROGRAM  (INSPECTIONS) Proper maintenance is critical to the delivery of clean, dry, uncontaminated fuel to aircraft. A well- executed  and  documented  PM  program  will  help achieve this goal, but a formal inspection program is also necessary. The implementation of an inspection program is the responsibility of the Fuel Management 7-10