TM  1-1520-240-10            4-4-1 SECTION  IV.  EXTENDED RANGE FUEL SYSTEM (ERFS) AND ERFS II WARNING The ERFS is a non-crashworthy auxiliary fuel system. The use of a non-crashworthy internal extended range fuel system may compromise the helicopters crashworthi- ness and may increase the risk of burns in a potentially survivable accident. 4-4-1.  Extended Range Fuel System The ERFS provides mission flexibility as an extended range mission kit and a for- ward area refueling source. The ERFS is mounted on the left side of the cabin be- tween sta 190 and 450, depending on the helicopter CG limits. The ERFS is a modu- lar, interconnected system composed of up to four 600 gal non-crashworthy metal tanks,    four    electrically    operated    fuel pumps, and a vent system with associated wiring  and  plumbing.  The  tanks  are  se- cured  using  5K  and  10K  pound  cargo straps. The fuel management control pan- el (FMCP) is housed in an aluminum box and is mounted on the forward most tank. Refer to TM 55-1560-307-13&P for installa- tion,  operation,  and  maintenance  proce- dures. WARNING Chains  will  not  be  used  to  tie  down  the ERFS. CAUTION FMCP will not be operated without fuel in the tank(s), or with tank cam lever in the CLOSED position. CAUTION A fuel sample is required before the first flight of the day. CAUTION Hot refueling is not recommended. NOTE For clarity, the tanks are numbered front to rear 1,2,3,4. In order to maintain helicopter CG, suggested tank burn is 4, 1, 3, 2. 4-4-2. Extended Range Fuel System II. The  Extended  Range  Fuel  System  II  (ERFS  II)  is  an internal tank fuel system that provides the CH-47D with the ability to fly for an extended period of time without having to land for refueling. The ERFS II may be installed in one, two or three tank applications in addition to the Forward Area Refuel Equipment (FARE) kit installation. Through the use of a FARE kit, the CH-47D can also be used to ferry fuel to forward areas to support refueling operations of other aircraft and equipment. The system consists of five functional components: the fuel tank as- sembly with fuel and vent hoses, restraint system, ERFS II  Fuel  Control  Panel,  and  FARE  kit  assembly.  Refer- ences and illustrations provided describe the three tank and FARE kit installation. Power is supplied to the ERFS II from the No. 1 DC BUS and No. 1 AC BUS through LH Utility Receptacles and wiring harness to the ERFS II Fuel Control Panel. Refer to TM 55-1520-240-23 and tM 1-1560-312-10 for installation and maintenance proce- dures. 4-4-3.  ERFS Capabilities. a. The ERFS provides up to 2320 gallons, (580 gal- lons  maximum  per  tank)  of  usable  fuel  for  extended range missions. b. The ERFS can be installed, operated, removed, transported, handled, and stored in climatic conditions of –32_C to +52_C. c. The ERFS can be installed and used in a one tank or multiple tank configuration as the mission requires. d. Fuel  quantity  can  be  accurately  monitored  in flight within four percent of the actual quantity using the liquid level indicators. e. The ERFS can be refueled using the splash fill or pressure fill techniques. f. The system can also be defueled using standard equipment. g. The ERFS has redundant fuel feed capability in all pump/tank combinations. h. Fuel  transfer  pump  system  can  operate  with APU, engine, or external power applied. i. The ERFS can be used as a forward area refuel- ing equipment (FARE) system, providing 2320 gallons of fuel for refueling other helicopters. 4-4-4.  Fuel Tank Assembly. The  ERFS  II  fuel  tank  assembly  consists  of  an  outer aluminum  honeycomb  and  fiberglass  shell  container, ballistically self-sealing bladder, plumping module, fuel hose, vent hose assembly, and ground cable. Each tank measures 58 inch L x 62 inch W x 64 inch H with the