TM 1-1510-225-10 3B-41 (h)  Deletion   of   Data.    Most  data  entry fields    may    have    the    associated    data    deleted    by entering a   – in the   scratchpad  and  pressing  the  line select  adjacent  to  the  desired  field.    In  some  cases, the  dash  entry  causes  the  data  to  revert  to  a  fixed default value (e.g., wind to 360º/0). (3)   System   Annunciations   and   Scratchpad Messages.    The  CDU  will  alert  the  crew  of  avionics failures,    degraded    operations,    system    modes    of operation    or    operator    entry    errors    via    the    CDU annunciation line and scratchpad.  The following three methods are used: 1.   Annunciations    on    the    annunciation line of the CDU. 2.   Scratchpad  messages  only  displayed locally     on     the     CDU     causing     the condition. 3.   Master     CDU     alert     annunciation     is provided   as   an   external   alert   in   the pilot’s primary field of view. Table 3B -9 provides a list of CDU annunciations and scratchpad messages. 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 3B-10. 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    3B -10    shows    the    priority    of    the    CDU annunciations (highest priority at top of list). Table 3B-9.  CDU Annunciations and Scratchpad Messages ANNUNCIATION /SP MESSAGE INITIATING CONDITION RESET MECHANISM LOCATION     BLINKING NOT CLEARABLE CDU MSG ALERT ACTIVE CHANNEL     Attempting to perform an ERF on a hopset that is the currently tuned preset on the V/UHF. Clear key SP A ADD ALTN BEFORE? An alternate flight plan has been selected to be added to the flight plan. Clear key or insertion of the alternate flight plan into the flight plan. SP N ALTN FPLN FULL Attempt to insert more than 60 legs into the alternate flight plan. Clear key SP A ANTI JAM MISMATCH Attempt to tune to an anti- jam preset that contains a Have Quick net when the V/UHF’s preset contains a SINCGARS net, and vice versa. Clear key SP A