TM 1-1510-225-10 9-8 7.  LEFT BLEED AIR VALVE switch – PNEU & ENVIR OFF. 8.  Light  still  illuminated  (after  30  seconds) LEFT   BLEED   AIR   VALVE   switch    – OPEN. 9.  RIGHT   BLEED   AIR   VALVE   switch   – PNEU & ENVIR OFF. 10.   Light  still  illuminated  (after  30  seconds) RIGHT   BLEED   AIR   VALVE   switch   – OPEN. NOTE If   the   DUCT   OVERTEMP   light   has   not extinguished  after  completing  the  above procedure,     the     warning     system     has malfunctioned. 9-21.  ENGINE ANTI-ICE FAILURE (L OR R ENG ICE FAIL ANNUNCIATOR ILLUMINATED   R  . 1.  ENGINE  ANTI-ICE  ACTUATOR  switch  – STANDBY. IF  ENG  ICE  FAIL  ANNUNCIATOR  DOES  NOT EXTINGUISH: 2.  Icing  conditions  –  Exit.    Assume  engine anti-ice     is     still     on     for     performance calculations. 9-22.  ENGINE BLEED AIR SYSTEM MALFUNCTION. a.  L    or    R    BL    AIR    FAIL    Annunciator Illuminated.      Steady   illumination   of   the   warning annunciator   in   flight   indicates   a   possible   ruptured bleed    air    line    aft    of    the    engine    firewall.        The annunciator will remain illuminated for the remainder of flight.  Perform the following: NOTE BL AIR FAIL annunciators may momentarily illuminate during simultaneous   surface   deice   and   brake deice operation at low N₁ speed. 1.  BRAKE DEICE switch – OFF. 2.  ITT    and    TORQUE    –    Monitor    (note readings). 3.  BLEED AIR VALVE switch – OFF. NOTE Brake   deice   (on   the   affected   side)   and rudder   boost   will   not   be   available   with bleed air valve switch off. 4.  Cabin pressurization – Check. b.  Excessive  Differential  Pressure.    If  cabin differential   pressure   exceeds   6.6   psi,   perform   the following: 1.  Cabin   pressurization   controller   –   Select higher setting. IF CONDITION PERSISTS: 2.  Oxygen   (crew   and    passengers)   –   As required. 3.  LEFT   BLEED   AIR   VALVE    switch    – ENVIR OFF. IF CONDITION STILL PERSISTS: 4.  RIGHT   BLEED   AIR   VALVE   switch   – ENVIR OFF. 5.  Descend – As required. IF CONDITION STILL PERSISTS: 6.  Oxygen masks – 100% and on. 7.  CABIN PRESS switch – DUMP. 8.  BLEED  AIR VALVE switches – OPEN (if cabin heating is required). 9-23.  LOSS OF PRESSURIZATION (ABOVE 10,000 FEET). If   cabin   pressurization   is   lost   when   operating above    10,000    feet    or    the    ALT   WARN    warning annunciator illuminates, perform the following: 1.  Crew oxygen masks – 100% and on. 2.  Passenger   oxygen   –   ON.      Check   to ensure all passengers have oxygen masks on and are receiving supplemental oxygen if required. 9-24.  DOOR UNLOCKED WARNING ANNUNCIATOR ILLUMINATED. Remain   clear   of   cabin   door   and   perform   the following: