TM 55-2840-241-23 (1)  Prepare  the  test  stand  for  operation  as outlined   in   TM   55-4920-328-13. To prevent fuel starvation at engine start and to prevent engine damage due   to   lack   of   lubricating   oil   at engine   start,   ensure   that   fuel   and lubrication  oil  are  available  at  the engine  fuel  and  oil  inlet  ports. (2) Place the N1 throttle lever to the zero degree position  as  indicated  on  the  throttle  position  indicator. (3) Place the governor lever to the minimum posi- tion. Abort the start if any of the follow- ing  conditions  occur: 1.   Time   from   starter   ON   to   idle speed  exceeds  one  minute.  Inves- tigate  and  correct  cause  before  at- tempting  another  start. 2.   Engine   oil   pressure   does   not start   to   increase   by   the   time   gas producer  rotor  speed  (N1)  reaches 20%speed.   Investigate   and   cor- rect    cause    before    attempting another  start. 3.  No  indication  of  power  turbine rotor   speed   (N2)  by  the  time  gas producer  rotor  speed  (N1)  reaches 30%speed.   Investigate   and   cor- rect   cause   if   malfunction   was   of test  stand  origin.  Reject  engine  if malfunction  was  of  engine  origin. 4.  Indicated  TOT  exceeds  1490°F (810°C)  for  more  than  10  seconds with  a  momentary  peak  of  one second   at   1700°F(927°C).   Refer to table 12-1. 5.  Indicated  TOT  exceeds  1700°F (927°C)   or   remains   at   1700°F (927°C) for more than one second. Refer to table 12-1. (4)   Simultaneously   press   the   start   switch   ig- nition   switch,   and   timer   start   switch. Do   not   advance   the   Nl throttle lever   above   the   0°   position   fuel cutoff)   until   the   proper   cranking speed   is   attained. An   over- temperature   start   or   an   explosive lightoff may occur. (5)  When  N1 speed   reaches   the   value   listed below,  advance  the  N1 throttle  lever  to  30  de- TOT   indication   retard   the   throttle   lever   to   the gree   position   (idle).   If   there   is   no   immediate 0°position   (fuel   cutoff).   Investigate   to   deter- mine  the  cause  for  no  lightoff. Ambient   temperature N 1 speed 7  to  54°C  (45  to  130°F)   15% -18  to  7°C  (0  to  44°F)   13% -54  to  -18°C  (-65  to  -l°F)   12% (6)  At  58%  N1 speed,   press   the   start switch  ,  and  ignition  switch  to  cut  off  starter and   Ignition. (7)  The  engine.  should  continue  to  ac- celerate  and  stabilize  at  62-64%  N1 speed (idle). (8)   Oil   pressure   should   beat   least   50   psi. NOTE During  cold  weather,  oil  pressure up   to   150   pSi   is   permissible. Operate  at  idle  until  normal  pres- sure  limits  can  be  maintained. b.    Operating. (1)  Idle.  Idle  is  the  same  setting  as  for starting  and  is  established  with  the  governor lever  at  the  minimum  position  and  the  N1 throt- tle  lever  at  the  idle  (30°)  opposition.  Other determining   factors   are: N 1 speed=   62   to   64% N 2 speed   =   75   to   105% GPTOT   =   Determine   from   figure   10-1 Torque  pressure  =  0  to  11  psi (2)    Flight    autorotation.    Flight    autorotation is  established    with  governor  lever  m  the  mini- mum    position  and  the  N1throttle  lever  at  any (90).   Other   determining   factors   are: position   between   idle   (30°)   and   maximum N1 speed   -   63%   (estimated) N2 speed   -98   to   108%   normal   (See table   10-1   for   exception) GPTOT   -   Determine   from   figure   10-1 Torque  pressure  -0  to  5  psi (3)  Take  off.  Takeoff  is  established  with the  N1 throttle  lever  at  maximum  (90°),  the governor   lever   positioned   to   produce   100%   N2 10-2 Change 14