TM 1-1510-225-10 2-59 display current ITT data.  To activate the event display, hold the EXCEEDENCE DISPLAY switch for 0.2 seconds or longer.  The events will be displayed in reverse  chronological  order  (most  recent  event  first).   All event displays will consist of the following cycles: 1.   A two-digit event number displayed for 2 seconds. 2.   The event peak temperature values in Celsius displayed for 2 seconds. 3.   The event duration, in seconds, displayed for 2 seconds. All  three  data  items  displayed  during  playback shall be prefixed with a  P if the event was recorded in non-start  mode  or  an   S  if  the  event  was  recorded  in start mode. Once   an   event   playback   sequence   has   been performed the  E  prefixed  to  the  digital  display  will  be removed.   All  event  data  is  still  available  for  playback until  the  data  is  erased.    The  display  will  be  prefixed with an  E again on the next power up cycle if the old data   has   not   been   erased   or   if   another   event   is recorded. (2)   Foot-Pound  Engine  Torquemeters.    The indicator displays the measured torque concurrently in a  1  alphabetic,  3  ½  -numeric  character  digital   display, and  a  41-segment  bar  graph  display.    The  indicator has  a  digital  display  range  of  0  to  2600  ft-lb. The bar graph display range is 0 to 2600 ft-lb. The  display  resolution  is  10  ft-lb.  for  the  digital section;  250  ft-lb.  for  the  bar  graph  section  in the 0 to 1000  ft-lb.  range,  50  ft-lb.  in  the  1000  to  2000  ft -lb. range,  25  ft -lb.  in  the  2000  to  2300  ft-lb.  range,  and 100 ft-lb. in the 2300 to 2600 ft-lb. range. The  display  will  contain  dashes  (------) when the measured   torque   is   greater   than   2600   ft-lb.      The dashes will be prefixed with an  F if an EEPROM failure has been detected or with an   E if an event has been stored and not played back.  The  F display shall take precedence over the E display. The indicator has a BIT test for the LCD display, ROM (program memory), RAM (volatile data memory), EEPROM  (non-volatile  memory),  and  the  signal  input path.      The   display   BIT   will   consist   of   displaying   all active  LCD  segments  for  3  seconds  on  power  up.    If the  RAM  or  ROM  BIT  fails  the  indicator  display  shall be blanked.  If the input signal fails BIT, the indicator will   display   "0"   on   both   the   digital   and   bar   graph displays.    BIT  failures  are  NOT  stored  in  EEPROM.   Once  the  power  is  cycled  the  display  is  not  affected unless the failure is again detected. Exceedence  events  will  be  stored  in  EEPROM memory.    Each  event  record  will  consist  of  two  16  bit words.        One    word    will    contain    the    peak    torque measured  during  the  event  and  the  other  word  shall contain the event duration in seconds.  A maximum of 50  events  shall  be recorded.  If more than 50 events are  recorded,  only  50  will  be  stored.    As  new  events are  recorded,  the  oldest  events  shall  be  discarded.   The  indicator  will  prefix  the  digital  display  with  an    E when an event is being or has been recorded and not played back. The   indicator   digital   display   will   start   flashing whenever   indicated   torque   exceeds   2230   ft-lb.    The flashing  will  stop  and  the  digital  torque  display  will  be prefixed with an  E when the time/torque combination is exceeded    and    the    indicator    begins     recording     an exceedence. NOTE Pressing  the  EXCEEDENCE  ERASE  switch for   0.2   seconds   or   longer   will   cause   all events    to    be    erased    from    non-volatile memory.  There is no provision for erasing individual events.  Event  display  will  take  precedence  over  normal digital  display.    The  bar  graph  will  continue  to  display current   engine   torque   data.      To   activate   the   event display, press the  EXCEEDENCE DISPLAY switch for 0.2  seconds  or  longer.   The  event  display  will  consist of the following: 1.   The   event   number   will   be   displayed for 2 seconds. 2.   The  event  peak  torque  value  will  be displayed for 2 seconds. 3.   The event duration, in seconds, will be displayed for 2 seconds. All  three  data  items  displayed  during  playback will   be   prefixed   with   a   P   unless   an   EEPROM   BIT failure has been detected in which case the display will be    prefixed    with    an   F.      Once   an   event   playback sequence  has  been  performed,  the    E  prefixed  to  the digital display shall be removed.  All event data is still available  for  playback  until  the  data  is  erased.    The display  will  be  prefixed  with  an   E  again  on  the  next power up cycle if the old data has not been erased or if another event is recorded. (3)   Turbine    Tachometers.        The     indicator displays     the     measured     N₁     concurrently     in     a     1