TM 55-4920-328-13 3-10.  Operating Procedures. WARNING Ear    protection    must    be    worn    by operating personnel outside the control cab when the engine is being operated.      Failure   to   observe   this warning will result in damage to and eventual loss of hearing. After lightoff, accomplish the following: WARNING If any operating parameter is abnormal, immediately stop operation of the engine and deenergize    the    system    using    the emergency   procedures   outlined   in paragraph  3-12.    Failure  to  observe this warning will result in damage to the   equipment   and   may   result   in serious injury to operating personnel.    Refer  to  the  applicable aircraft manual for operation parameters. a.  Observe the percent of NI speed displayed on the GAS  PRODUCER  meter  (4,  figure  1-24)  to  determine the point at which Ground Idle is reached after lightoff. b.   Record the time required for the engine to reach the specified Ground Idle speed on the engine test log. c.    Monitor  the  critical  temperature  displayed  on  the EXHAUST  GAS  TEMP  meter  (38)  and  record  the  data on the engine test log. d.    Test  the  engine  in  accordance  with  the  specified test   procedures   contained   in   the   appropriate   engine technical  manual.    Record  all  test  parameters  on  the engine test log. e.  During test of a T73 engine, when required to set the    power    trim    to    either    the    full-clockwise    or    full- counterclockwise   position,   depress   and   hold   the   T73 PWR LEVER CW switchlight unit S5 (23, figure 1-24) or the   T73   PWR   LEVER   CCW   switchlight   unit   S14,   as appropriate.    Hold  the  applicable  switchlight  unit  in  the depressed   position   for   a   minimum   of   15   seconds   to ensure  full  travel  operation  of  the  trim  control  on  the engine. f.      During      test   of   the   T73-P-700      engine,   when required to check the Nil overspeed switch (238A, figure 2-50), depress and hold the T73-OVER-SPEED switchlight (28A, figure 1-24) and monitor the Nil speed on  the  POWER  TURBINE  indicator  (5)  to  ensure  the engine    speed    is    within    specified    limits.        Release switchlight (28A). g.    Constantly  monitor  the  pressures,  temperatures, and  vibration  readout  instrumentation  relative  to  water brake performance, using the criteria specified in figure 3-1  and  the  table  3-2.    Do  not  exceed  the  specified parameters. h.  After completion  of the test, deenergize the METS systems as outlined in the normal shutdown procedures specified in paragraph 3-11. i.  If a T55 engine was tested in accordance with the preceding  instructions,  electrically  disconnect  the  T55 electrical torque system instrumentation as follows: (1)  Pull the operator's panel 3A1 out of the console to gain access to internal connections. (2)      For  the  T55-L-11/712,  disconnect  P8  of  the branched   cable   assembly   (10,   figure   2-7)   from   the mating connector on the inverter (6). (3)  If the T55-L-7 torque indicator (2) was installed and connected for testing a T55-L-7 engine, disconnect P5 of the branched cable assembly (10) from the mating connector on the torque indicator. (4)    If  the  T55-L-11/712    torque    indicator  (3)  was installed    and    connected    for    testing    a    T55-L-11/712 engine,  disconnect  P6  and  P7  of  the  branched  cable assembly (10) from the mating connectors on the torque indicator. (5)  Slide operator's panel 3A1 into the console. Change 4 3-11