TM 1-1510-225-10 9-11 2.  Fuel   FIREWALL   SHUTOFF   VALVE   – CLOSED. 3.  Land as soon as practicable. d.  Fuel Crossfeed.  Fuel crossfeed is normally used  only  during  single-engine  operation.    The  fuel from   the   inoperative   engine   side   may   be   used   to supply   the   operative   engine,   by   routing   the   fuel through   the   crossfeed   system.      During   extended flights,  this  method  of  fuel  usage  will  provide  a  more balanced lateral load condition in the aircraft.  For fuel crossfeed, use the following procedure: 1.  AUX TRANSFER switches – AUTO. NOTE With the fuel FIREWALL SHUTOFF VALVE CLOSED, fuel in the auxiliary tank for that side   will   not   be   available   (usable)   for crossfeed. 2.  STANDBY PUMPS – OFF. 3.  CROSSFEED FLOW – As required. 4.  FUEL CROSSFEED annunciator illuminated – Check. NOTE With the Fuel FIREWALL SHUTOFF VALVE CLOSED, the FUEL PRESS annunciator will remain  illuminated  on  the  side  supplying fuel. 5.  FUEL PRESS annunciator extinguished – Check. 6.  Fuel quantity – Monitor. 9-28.  ELECTRICAL SYSTEM EMERGENCIES. a.  DC GEN Light Illuminated.  Illumination of L DC GEN or R DC GEN caution light indicates failure of a  generator  or  one  of  its  associated  circuits.    If  one generator system becomes inoperative, all nonessential   electrical   equipment   should   be   used judiciously     to     avoid     overloading     the     remaining generator.  If both generators are shut off due to either generator    system    failure    or    engine    failure,    all nonessential    equipment    should    be    turned    off    to preserve battery power for extending the landing gear and  flaps.    When  a  L  DC  GEN  or  R  DC  GEN  light illuminates, perform the following: 1.  GEN switch – OFF, RESET, then ON. IF THE GENERATOR DOES NOT RESET: 2.  GEN switch – OFF. 3.  Operating loadmeter – 100% maximum. b.  Both DC GEN Lights Illuminated. 1.  All nonessential equipment – Off. 2.  Land as soon as practicable. 3.  Fuel  may  be   manually   transferred   from ferry tanks using wobble pump installed in the fuel pump assembly. c.  Excessive    Loadmeter    indication    (Over 100%).      If   either   loadmeter   indicates   over   100%, perform the following: 1.  BATT switch – OFF (monitor loadmeter). IF   LOADMETER   STILL   INDICATES   ABOVE 100%: 2.  Nonessential electrical equipment – Off. IF LOADMETER INDICATES 100% OR BELOW: 3.  BATT switch – ON. d.  INVERTER    Warning    Light    Illuminated. Illumination   of   the   INVERTER   warning   annunciator indicates   that   the   selected   inverter   is   inoperative. Perform the following: 1.  Select the other inverter. e.  Circuit   Breaker   Tripped.      If   the   circuit breaker is for a nonessential item, do not reset in flight. If the circuit breaker is for an essential item, the circuit breaker may be reset once.  Perform the following: 1.  Nonessential   circuit   –   Do   not   reset   in flight. 2.  Essential  circuit  –  Reset  once.    If  it  trips again, do not reset. f.   Bus  Feeder  Circuit  Breaker  Tripped  (Fuel Panel Bus Feeders and Right Circuit Breaker Panel Bus Feeders). 1.  A short is indicated, do not reset in flight. O