TM  55-1510-221-10 Table 2- 7. Caution/Advisory Annunciator Panel Legend (Sheet 1 of 2) CAUTION/ADVISORY  ANNUNCIATOR NOMENCLATURE COLOR CAUSE  FOR  ILLUMINATION No.1  DC  GEN Yellow No.1  engine  generator  off  the  line No. 1 INVERTER Yellow No.  1  inverter  inoperative REV  NOT  READY Yellow Propeller  levers  are  not  in  the  high  RPM,  low  pitch  position, with  the  landing  gear  extended No.2   INVERTER Yellow No.2   inverter   inoperative No.2  DC  GEN Yellow No.2  engine  generator  off  line No.1  EXTGH  DISCH Yellow No.  1  engine  fire  extinguisher  discharged No.1  NAC  LOW Yellow No.1  engine  has  20  minutes  fuel  remaining  at  sea  level,  nor- mal  cruise  power  consumption  rate CABIN  DOOR Yellow Cabin/door  open  or  not  secure No.2  NAC  LOW Yellow No.2  engine  has  20  minutes  fuel  remaining  at  sea  level,  nor- mal  cruise  power  consumption  rate No.2   EXTGH   DISCH Yellow No.2  engine  fire  extinguisher  discharged No.  1  VANE  FAIL Yellow No.1  engine  ice  vane  malfunction.  Ice  vane  has  not  attained proper   position BATTERY   CHARGE Yellow Excessive  charge  rate  on  battery PROP  SYNC  ON Yellow Synchrophaser  turned  on  with  landing  gear  extended No.2  VANE  FAIL Yellow No.2  engine  ice  vane  malfunction.  Ice  vane  has  not  attained proper   position DUCT   OVERTEMP Yellow Excessive  bleed  air  temperature  in  environmental  heat  ducts IFF Yellow Transponder  fails  to  reply  to  a  valid  mode  4  interogation No.1  NO  FUEL  XFR Yellow Auxiliary fuel tank on side of No. 1 engine not transferring fuel into  nacelle  tank No.2  NO  FUEL  XFR Yellow Auxiliary  fuel  tank  on  side  of  No.2  engine  not  transferring  fuel into  nacelle  tank No.1  LIP  HEAT Yellow Failure  of  lip  heat  valve  to  conform  to  selected  position  or  in transit No.2  LIP  HEAT Yellow Failure  of  lip  heat  valve  to  conrom  to  selected  position  or  in transit INS Yellow Inertial  navigation  system’s  cooling  fan  is  off  or  an  INS  mal- function  that  illuminates  the  WARN  annunciator  on  the  CDU No.1  LIP  HEAT  ON Green No.1  engine  air  scoop  heat  switch  is  on No.2  LIP  HEAT  ON Green No.2  engine  air  scoop  heat  switch  is  on A/C  COLD  OPN Green Air  conditioner  is  operating  in  cold  mode,  or  ambient  temper- atures  require  switching  to  cold  mode  if  air  conditioner  opera- tion  is  to  be  continued No.1  VANE  EXT Green No.  1  ice  vane  extended FUEL   CROSSFEED Green Crossfeed  valve  open AIR  COND  N,  LOW Green No.2  engine  RPM  too  low  for  air  conditioning  load No.2  VANE  EXT Green No.2  ice  vane  extended No.1  IGN  ON Green No.1  engine  ignition/start  switch  on  No.1  engine  autoignition switch  armed  and  engine  torque  below  20  percent 2-75