TM 55-1510-220-10 1. Oil pressure below 105 PSI below 21,000 feet or 85 PSI 21,000 feet and above, torque 49% maximum. 2. Oil pressure below 60 PSI Perform engine shutdown, or land as soon as practicable using minimum power to insure safe arrival. 9-9.   CHIP DETECTOR WARNING LIGHT ILLUMINATED. If  a  L  CHIP  DETR  or  a  R  CHIP  DETR  warning  light illuminates, and safe single-engine flight can be maintained; perform engine shutdown. 9-10.   DUCT OVERTEMP CAUTION ANNUNCIATOR LIGHT ILLUMINATED. If  a  DUCT  OVERTEMP  caution  annunciator  light  is illuminated,  insure  that  the  cabin  floor  outlets  are  open and   unobstructed,   then   perform   the   following   steps   in sequence until the light is extinguished.  After completion of   steps   1   thru   4,   if   light   does   not   extinguish,   Allow approximately  30  seconds  after  each  adjustment  for  the system  temperature  to  stabilize.    The  overtemperature condition  is  considered  corrected  at  any  point  during  the procedure that the light extinguishes. (1.) Cabin air control - In. (2.) Cabin temperature mode selector switch - AUTO. (3.) Cabin temperature control rheostat - Full decrease. (4.) Vent blower switch - HI. (5.) Cabin temperature mode selector switch - MAN COOL. (6.) Manual temperature switch - DECREASE (hold). (7.) Left bleed air valve switch - ENVIRO OFF. (8.) If the light is still illuminated after 30 seconds: Left bleed air valve switch - OPEN. (9.) Right bleed air valve switch - ENVIRO - OFF. (10.) If the light is still illuminated after 30 seconds: Right bleed air valve switch - OPEN. NOTE If     the     overtemperature     light     has     not extinguished   after   completing   the   above procedure, the warning system has malfunctioned. 9-11.  ICE VANE FAILURE. Ice  vane  failure  is  indicated  by  #1  VANE  FAIL  or  #2 VANE  FAIL  caution  annunciator  light  illumination.    If  an ice    vane    fails    to    operate    electrically,    perform    the following: CAUTION After   the   ice   vanes   have   been   manually extended, they may be mechanically retracted.        No    electrical    extension    or retraction shall be attempted as damage to the electric actuator may result.  Linkage in the   nacelle   area   must   be   reset   prior   to operation  of  the  electric  system.      Do  not reset ice vane control circuit breaker. CAUTION Do  not  retract  ice  vanes  electrically  after manual extension. 1. Airspeed - 160 KIAS or below. (2.) Ice vane control circuit breaker - Pull. 3. Ice vane - Operate manually. 4. Airspeed - Resume normal airspeed. 9-12.   ENGINE BLEED AIR SYSTEM MALFUNCTION. a. Bleed    Air    Failure    Light    Illuminated.        Steady illumination   of   the   warning   light   in   flight   indicates   a possible ruptured bleed air line aft of the engine firewall. The   light   will   remain   illuminated   for   the   remainder   of flight.  Perform the following: NOTE L BL AIR FAIL or R BL AIR FAIL lights may momentarily illuminate during simultaneous surface de-ice and brake de- ice operation at low N 1 speeds. 9-7