TM 1-1510-225-10 9-12 NOTE The  items  that  may  be  inoperative  can  be determined   from   the   electrical    system schematic in Chapter 2, Systems. g.  BATTERY   CHG   Annunciator   Illuminated During  Ground  Operations.    The  BATTERY  CHG annunciator will illuminate after an engine start.  If the annunciator  does  not  extinguish  within  approximately 5 minutes, monitor the battery charge current using the following procedure: 1.   One generator – OFF. 2.   Voltmeter – Indicating 28 volts. 3.   Momentarily  turn  the  battery  OFF  –  Note change in loadmeter indication. NOTE The  change  in  loadmeter  indication  is  the battery  charge  current  and  should  be  NO more  than  2.5%  (only  perceivable  needle movement). If the results are unsatisfactory,  repeat  the  check  until  the charge   current   decreases   to   less   than 2.5%. h.  BATTERY CHG Annunciator Illuminated In Flight.    In-flight  illumination  of  the  BATTERY  CHG annunciator  indicates  a  possible  battery  malfunction. Use the following procedure: 1.   BATT – OFF. 2.   BATTERY CHG annunciator –  Check.    If extinguished,  continue  flight.    If  the  light remains    illuminated,    land    as    soon    as practicable. i.   Generator Overheat F3 . 1.   GEN – OFF. 2.   Electrical load – Check. 3.   Current limiters – Check. j.   Current Limiter Check. 1.   If     both     DC    GEN annunciators are illuminated  –  Individually  press  each  volt/ loadmeter switch and observe voltage.  If generator voltage is not seen on voltmeter,  that  current  limiter  has  burned open. 2.   If one  DC GEN annunciator is illuminated – Press both  volt/loadmeter switches  and observe  voltage.    If  generator  voltage  is not seen on the affected side, one or more current   limiters   have   burned   open.      If battery voltage is not seen on the affected side,  the  current  limiter  for  that  side  has burned open. 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: 1.   POWER levers – IDLE. 2.   PROP levers – HIGH RPM. 3.   FLAPS – APPROACH. 4.   GEAR – DN. 5.   Airspeed – 181 KIAS maximum. NOTE Windshield defogging may be required. 9-30.  LANDING EMERGENCIES. Structural  damage  may  exist  after  landing with brake, tire, or landing gear malfunctions.      Under   no   circumstances shall  an  attempt  be  made  to  inspect  the aircraft until jacks have been installed. NOTE If    the    HYD    FLUID    LOW    annunciator illuminates during flight, attempt to extend the  landing  gear  normally  upon  reaching destination.    If  the  landing  gear  fails  to extend, follow the procedures for LANDING GEAR MANUAL EXTENSION. a.  Landing  Gear  Unsafe  Indication.    Should one or more of the landing gear fail to indicate a safe condition,  the  following  steps  should  be  taken  before proceeding manually to extend the gear. 1.   LDG GEAR CONTROL – Check DN. WARNING