TM 55-1510-219-10 NOTE The  engines  must  not  be  started until  after  the  INS  is  placed  into the NAV mode or OFF as required. 2. Avionics master switch-As required. NOTE Use  the  beacons  NIGHT  position for all ground operations, changing to the DAY position only when taking the active runway for takeoff (when conditions permit). 3. Exterior light switches-As required. 4. Ignition     and     engine     start     switch-ON. Propeller    should    begin    to    rotate    and associated IGN ON light should illuminate.  Associated FUEL PRESS light should extinguish. 5. Condition  lever  (after  N1  RPM  stabilizes, 12% minimum)-LOW IDLE. CAUTION Monitor  TGT  to  avoid  a  hot  start. If  there  is  a  rapid  rise  in  TGT,  be prepared  to  abort  the  start  before limits     are     exceeded.          During engine start, the maximum allowable  TGT  is  1000°C  for  five seconds.  If this limit is exceeded, use ABORT START procedure and discontinue  start.    Enter  the  peak temperature  and  duration  on  DA Form 2408-13. 6. TGT and N1-Monitor (TGT 1000C maximum, NI 52% minimum). 7. Oil pressure-Check (60 PSI minimum). 8. Ignition and engine start switch-OFF after TGT stabilized. 9. Condition lever-As required.  Monitor TGT as the condition lever is advanced. 10. DC GPU disconnect-As required. 11. Generator    switch    (GPU    disconnected)- RESET, then ON. 12. Condition lever-HIGH IDLE. 8-28.  SECOND ENGINE START (GPU START). 1. Ignition     and     engine     start     switch-ON. Propeller     should     start     to     rotate     and associated IGN ON light should illuminate.  Associated FUEL PRESS light should extinguish. 2. Condition   lever   (after   N1   RPM   passes 12% minimum)-LOW IDLE. CAUTION Monitor  TGT  to  avoid  a  hot  start. If  there  is  a  rapid  rise  in  TGT,  be prepared  to  abort  the  start  before limits     are     exceeded.          During engine start, the maximum allowable  TGT  is  1000°C  for  five seconds.  If this limit is exceeded, use ABORT START procedure and discontinue  start.    Enter  the  peak temperature  and  duration  on  DA Form 2408-13. 3. TGT and N1-Monitor (TGT 1000°C maximum, N1 52% minimum). 4. Oil pressure-Check (60 PSI minimum). 5. Ignition and engine start switch-OFF after TGT stabilized. 6. Propeller levers-FEATHER. 7. GPU-Disconnect.  (Check aircraft external power   and   mission   external   power   light extinguished). 8. Propellers levers-HIGH RPM. 9. Generator switches-RESET, then ON. 10. Aircraft inverter switches-ON, check INVERTER lights OFF. 11. Condition levers-As required. 8-29.  BEFORE TAXIING. *1. Brake deice-As required.  To activate the brake deice system proceed as follows: a. Bleed air valves-As required. b. Brake  deice  switch-DEICE.    Check BRAKE DEICE ON light illuminated. c. Condition levers-HIGH IDLE. CAUTION Verify  airflow  is  present  from  aft cockpit  eyeball  outlets  to  insure sufficient     cooling     for     mission equipment. *2. Cabin temperature and mode-Set. 8-14