TM 1-1520-218-10 3C-186 Table 3C-100.  Subsystem Status Page Procedure NO. DESCRIPTION/FUNCTION 1 The  status annunciation indicates that a failure has occurred. 2 Press to access the FMS status page. 3 The  status  is  cleared  when  FMS  Status page is accessed.  It can also be cleared with the  CLR  function  key  while  on  other pages. 4 Vertically     scroll     to     access     navigation sensor and navigation radio status pages. (4)   Individual   LRU   Detailed   Status   Pages.   The results of CBIT's by each LRU is displayed on the respective  detailed  status  pages  which  are  accessed by    pressing    the    line    select    key    adjacent    to    the respective LRU display on the status  page.  Unknown status  (i.e.,  bus  controller  is  unable  to  communicate with  a  LRU)  is  indicated  by  dashes  in  the  top-level status   field.      A   failure   counter   is   provided   on   all detailed  status  pages  to  indicate  the  total  number  of hardware    and    MIL-STD-1553B    data    bus    failures.   Status monitoring may be disabled for any LRU on its individual  status  pages  (for  example,  if  an  intermittent failure  is  causing  nuisance  alerts).    This  prohibits  the STATUS  annunciation  from  being  displayed  and  the CDU  alert  or  MSG  annunciation  from  being  activated for LRU failures.  All status-monitoring results continue to be displayed on the detailed status page.  The state of this selection is always reset to enable reporting on power up.  Refer to Figure 3C-139  and  Table  3C-101.   The    definition    of    each    LRU    status    indication    is provided  in  Table  3C-102.    Bit  definition  is  read  from left  (bit  1)  to  right  (bit  16)  on  each  status  page.    A  1 indicates a failure condition. Figure 3C-139.  Detailed CDU Status Page Table 3C-101.  Detailed CDU Status Page Procedure NO. DESCRIPTION/FUNCTION 1 Indicates the total number of failures since last reset of failure counter. 2 Resets failure counter to 0. 3 Indicates overall CDU status: GO, NGO, TST, or  ---. 4 Returns to the FMS status page. 5 Indicates if CDU is either BC (bus controller) or RT (remote terminal). 6 CBIT word, detailing LRU failures, reads left-to-right and 1 indicates a failure. 7 FMB  bus  status:    GO,  NGO-A  (bus  A  failed),  NGO-B  (bus  B  failed),  NGO-T  (terminal failure or both bus A and B failed) 8 OFP version. 9 Enables (ON) or disables (OFF) reporting of status monitoring annunciations.