TM 1-1510-224-10 9-9.        ENGINE    RESTART    DURING    FLIGHT    (NO STARTER ASSIST). CAUTION This  procedure  should  be  conducted only during an emergency and should not be practiced or demonstrated.      This   procedure   will cause    damage    to    the    engine    hot section. CAUTION The pilot should determine the reason     for     engine     failure     before attempting     an     airstart.          Do     not attempt    an    airstart    if    N,    indicates zero.  Do not attempt engine airstarts above 25,000 ft. As engine accelerates    to    idle    speed,    it    may become necessary to move the condition  lever  into  FUEL  CUTOFF  in order  to  avoid  an  over  temperature condition. (1) POWER lever - IDLE. (2) PROP lever -  HIGH RPM. (3) CONDITION lever -  FUEL CUTOFF. (4) CABIN  AIR  MODE  SELECT  switch  -  As required. (5) FIRE   PULL   handle   -   Push   (PUSH   TO EXTINGUISH annunciator extinguished). (6) Engine anti-ice - Off. (7) GENERATOR  switch (inoperative engine) - OFF. 8. Airspeed - As required (140 kn6ts propeller  windmilling,  190  knots  propeller feathered). 9. Altitude - Below 25,000 feet. 10. Engine  cleanup  -  Perform  if  engine  restart is unsuccessful. (11) Engine     N,     -     Monitor     (10%     minimum, propeller feathered). NOTE N,   may   be   increased   by   increasing airspeed. (12) AUTO IGNITION switch - ARM. (13) CONDITION lever -  LOW IDLE. 14. Power - As required (after TGT peaks). (15) GENERATOR switch - RESET, then ON. 16. PROP SYNC switch - As required. 17 Electrical equipment - As required. (18) CONDITION lever -  HIGH IDLE. (19) CABIN  AIR  MODE  SELECT   switch  -  As required. 9-10.      ENGINE   RESTART   DURING   FLIGHT   (USING STARTER). Engine    restarts    should    only    be    attempted    below 25,000   feet.      If   a   restart   is   attempted,   perform   the following: CAUTION The pilot should determine the reason     for     engine     failure     before attempting     an     airstart.          Do     not attempt    an    airstart    if    N₁    indicates zero. Do not attempt engine airstarts above 25,000 feet. During engine acceleration   to   idle   speed,   it   may become necessary to move the CONDITION  lever  into  FUEL  CUTOFF in order to avoid an over temperature condition. (1) CABIN    AIR    MODE    SELECT    switch    - OFF. (2) FWD VENT BLOWER switch - AUTO. (3) AUTO PLT POWER switch - Off. WARNING Airstarts     using     the     starter     assist procedures will cause the momentary loss of all electronic flight instrument system    (EFIS)    data.        The    engine restart  during  flight  (no  starter  assist procedure), or turning EFIS power off prior    to    a    starter   assisted    restart, should normally be performed. (4) EFIS    POWER    switches    (2)    -    OFF    (if conditions permit). NOTE If   EFIS   power   is   turned   off,   aircraft attitude    should    be    maintained    by using   outside   visual   references   or the air driven standby attitude indicator and turn-and-slip indicator. (5) Radar - SBY or OFF. 9-4