TM 1-1510-218-10   3C-79 Table 3C-15.  CDU Annunciations and Scratchpad Messages  (Continued) ANNUNCIATION / SP MESSAGE INITIATING CONDITION RESET MECHANISM LOCATION BLINKING NOT CLEARABLE CDU MSG ALERT XXXX:XX UTC    DISPLAY    enabled on the Start 1 page. Disable UTC DISPLAY on Start 1 page. A N X SP scratchpad message Location A annunciation line N steady (non-blinking) B blinking Blinking A alternating (between SP message and entered SP data) Not Clearable X annunciation is non-clearable LEGEND MSG Alert X activates external CDU alert annunciation The  scratchpad  messages  are  displayed  in uppercase    letters.        Some    of    the    messages alternate  with  the  entered  data  that  caused  the message. If a scratchpad message is simultaneously  displayed  with  data,  the  first   CLR key  activation  will  clear  the  scratchpad  message and the next CLR will clear the scratchpad. Annunciations   are   displayed   in   lowercase letters.      The   annunciation   line   displays   only   a single annunciation at a time; however, a + marker will appear to indicate when multiple annunciations are    present.        The    priority    of    annunciations    is shown  in  Table  3C-15.    The  +  flashes  whenever an unacknowledged and lower priority annunciation    is    generated.        Annunciations    are acknowledged    by    pressing    the    CLR    key    and cycling through the currently active annunciations. Additionally, the chart indicates if the annunciation is non-clearable and if the CDU master alert annunciation is also    set    by    the    associated    condition.        For    clearable annunciations,  use  the    CLR   key   to   clear.      If   data   or scratchpad messages are in the scratchpad, the   CLR key will     first     clear     the     scratchpad     before     clearing     the annunciation line. Table 3C-16     shows     the     priority     of     the     CDU annunciations (highest priority at top of list). In    addition    to    the    annunciations    and    scratchpad messages listed in Table 3C-16, the FMS-800 will provide the  additional  alerts  listed  in  Table  3C-17  to  inform  the flight  crew  of  various  flight  conditions.    These  alerts  may appear either on electronic flight instrument displays or on annunciator light displays.