TM 55-1510-219-10 of   a   generator   or   one   of   its   associated   circuits (generator   control   unit).      If   one   generator   system becomes     inoperative,     all     nonessential     electrical equipment    should    be    used    judiciously    to    avoid overloading  the  remaining  generator.    The  use  of accessories which create a very high drain should be avoided.  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    wing    flaps.        When    a    DC    GEN    light illuminates, perform the following: 1. Generator switch-OFF, RESET, then ON. 2. Generator switch (no reset)-OFF. 3. Mission control switch-OVERRIDE. 4. Operating  loadmeter-100%  maximum. b. Both DC GEN Lights Illuminated. 1. All nonessential equipment-OFF. 2. Land as soon as practicable. c. Excessive Loadmeter Indication (Over 100%).      If   either   loadmeter   indicates   over   100%, perform the following: 1. Battery switch-OFF (monitor loadmeter). 2. Loadmeter over 100%-Nonessential electrical equipment OFF. 3. Loadmeter under 100%-BATT switch ON. d. Inverter Light Illuminated.  Illumination of the #1    or    #2    AIRCRAFT    INVERTER    caution    light indicates   failure   of   the   affected   inverter.      When either     inverter     fails,     the     total     aircraft     load     is automatically   switched   to   the   remaining   inverter. When    a    #1    or    #2    AIRCRAFT    INVERTER    light illuminates, perform the following: 1. Affected AIRCRAFT INVERTER switch-OFF. e. INST  AC  Light  Illuminated.    Illumination  of the  INST  AC  warning  light  indicates  that  26  VAC power is not available.  All items connected to the 26 VAC bus will be inoperative.  Under these conditions, power  must  be  controlled  by  indications  of  the  N1 and TGT gages.  Perform the following: 1. N1 and TGT indications-Check. 2. Other engine instruments-Monitor. f: 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.    If  a  bus  feeder  circuit breaker (on the overhead circuit breaker panel) trips, a short is indicated.  Do not reset in flight.  If a circuit breaker trips, perform as follows: 1. BUS FEEDER breaker tripped-Do not reset. 2. Nonessential circuit-Do not reset. 3. Essential circuit-Reset once. g. BATTERY CHARGE Light Illuminated. 1. Battery volt-amp meter Check. a. Amp    reading    above    7    amps    and decreasing Monitor. b. Amp    reading    above    7    amps    and increasing Battery switch OFF. 2. Battery    switch    ON    (for    landing    prior    to gear/flap extension). 9-29.  EMERGENCY DESCENT. Emergency  descent  is  a  maximum  effort  in which   damage   to   the   aircraft   must   be   considered secondary to getting the aircraft down.  The following procedure   assumes   the   structural   integrity   of   the aircraft   and   smooth   flight   conditions.      If   structural integrity is in doubt, limit speed as much as possible, reduce  rate  of  descent  if  necessary,  and  avoid  high maneuvering     loads.          For     emergency     descent, perform the following: NOTE Windshield  defogging  may  be required. 1. Power lever-IDLE. 2. Propeller lever-HIGH RPM. 3. Flap lever-APPROACH. 4. Gear-DN. 5. Airspeed-184 KIAS maximum. 9-11