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Figure 1-1.  Extended Range Fuel System (Sheet 5 of 5).
Figure 1-2.  Extended Range Fuel System Block Diagram

TM-55-1560-307-13P AH-1E/F/P/S Helicopter Manual
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TM 55-1550-307-13&P WARNING Installing  the  non-crashworthy  ERFS increases the potential for fires during a crash.  The number of personnel on board  the  aircraft  will  be  kept  to  the minimum    required    to    perform    the required     mission.     Additionally,     all personnel  are  required  to  be  seated with a lap belt during flight. 1-8.        FUNCTIONAL    DESCRIPTION.        An    over-all description   of   the   ERFS   is   provided   in   the   following paragraphs.  A brief functional description of the ERFS components   and   information   on   operational   status   is also   provided.      The   ERFS   is   illustrated   in   functional block diagram, Figure 1-2. a.  The operation of each tank is independent of the others  when  used  in  multiples  greater  than  one.  The ERFS  system  (combined  with  the  FMCP)  allows  any one  tank  in  a  multiple  installation  to  feed  the  aircraft's main fuel tanks without the need to manually disconnect or connect the feed lines. b.      After   the   ERFS   tanks   are   installed   on   the aircraft, the system is treated as part of the aircraft. 1-9.    FMCP  FUNCTIONAL  DESCRIPTION.    The  fuel management    control    panel    houses    the    fuel    pumps utilized    in    fuel    transfer    operations.        Selective    fuel management  is  incorporated  to  enable  the  operator  to operate either single or multiple pumps and tanks at his discretion.  Electrical power is furnished by the existing aircraft power receptacles located at station 260. 1-10.      EQUIPMENT   CHARACTERISTICS,   CAPABI- LITIES, AND FEATURES. a.      The   ERFS   transports   with   ease   due   to   the design of the skid mounts and hoisting eye. b.  The ERFS provides 2320 gallons of usable fuel for extended range missions. c.  The ERFS can be installed, operated, removed, transported, handled, and stored in all climatic conditions   compatible   with   the   CH-47D   and   MH-47D helicopters. d.    The  ERFS  tanks  are  capable  of  being  stored five  years  without  deterioration,  provided  the  tanks  are sealed. e.    Fuel  quantity  can  be  accurately  monitored  in flight within four percent of the actual quantity using the liquid level indicators. f.  The system can also be defueled using standard equipment. g.  The ERFS has redundant fuel feed capability in all pump/tank combinations. h.  ERFS Servicing.  The system tanks can be filled by gravity (splash fill).  System is capable of accepting all types of aviation fuel to include JP-4, -5, and -8. i.      The   ERFS   can   be   used   as   a   fare   system, providing 2320 gallons of fuel for refueling other aircraft. j.    The  ERFS  can  be  installed  and  used  in  a  one tank    or    multiple    tank    configuration    as    the    mission requires. k.      Accessibility   to   fuel   filler   port,   liquid   level indicators,  and  fuel  sample  drain  provide  better  means for servicing the system. I. Mounting angle brackets provide easy installation of FMCP and interchangeability from tank to tank. m.        Tank    access    covers    are    fabricated    with spillproof rollover vent valve. Change 2 1-7







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