TM 1-1510-218-10 3C-60 Table 3C-15.  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 APPROACH Given    for    the    following conditions: 1.For  a  GPS  approach mode, 10 seconds after flashing APPROACH annunciation is activated  and  the  HSI deviations   and   RAIM Integrity    performance are  set  for  approach mode. 2.Flight sequence mode transitions or manually    selected    to approach and the 10 second flashing APPROACH annunciation is not active. HSI deviations change to terminal, en route, or oceanic mode.   A N X