TM 1-1510-218-10 3C-144 Table 3C-68.  Tactical Approach Selection Procedure NO. DESCRIPTION/FUNCTION 1 Select the tactical approach page. 2 Define the approach as desired. 3 Enter a FAF. 4 Enter a MAP. 5 Enter    the    desired    glideslope    into    the MAP. 6 Enter  the  Runway  Elevation  mean  sea level for the MAP. 7 Insert the approach into the flight plan. (a)   To change the FAF displayed on line 1, type in a valid waypoint in the scratchpad and press line select key 1 or 5.  To copy the waypoint displayed on line 1 into the scratchpad, press line select key 1 or 5   when   the   scratchpad   is   blank.      To   delete   the waypoint    indicated    on    line    1,    enter    a    –    in    the scratchpad and press line select key 1 or 5. (b)   To   change   the   MAP,   type   a   valid waypoint in the scratchpad and press line select key 2 or 6.  To copy the MAP into the scratchpad, press line select  key  2  or  6  when  the  scratchpad  is  blank.    To delete the MAP, enter an * in the scratchpad and press line select key 2 or 6. (c)   The default value defining the glideslope is 3.0° and is automatically displayed at line select   key   3   when   the   Tactical   Approach   page   is displayed.    To  change  this  value,  enter  the  desired value (0 to 6.0°) into the scratchpad and  press the line select key 3.  To change the runway elevation, type a valid  elevation  in  the  scratchpad  and  press  the  line select key 2 or 6. (d)   To  insert  the  tactical  approach  into the flight plan, select the  FPLN INSR line select key.   The   Flight   Plan   page   will    be    displayed    and    the message, INSRT V–APR BEFORE?, will appear in the scratchpad.      Press   the   line   select   key   next   to   the desired waypoint to insert the approach at that point. (e)   If  one  or  more  of  the  FAF,  MAP,  or runway  elevation  parameters  are  missing,  an attempt to   insert   the   approach   will   result   as   an   ENTER PARAMETERS message in the scratchpad. (9)   Deleting or Changing the FMS Approach.   Once  an  FMS  Approach  of  any  type  is  in  the  flight plan,  it  may  be  deleted  or  replaced  with  a  different approach.    Access  the  FMS  Approach  pages  via  the EDIT  key  to  access  a  working  copy  definition  of  the approach  or  press  the   A or  F  attribute  line  select  on the  Flight  Plan  Waypoint  page  for  the  MAP  or  FAF waypoint to access the current flight plan definition. Select the desired approach in the working copy approach definition and select FPLN MOD.  When the working   copy   replaces   the   existing   approach,   the existing approach is discarded.  To remove the current approach  procedure  from  the  flight  plan,  access  the current approach definition and select FPLN RMV. (10)   Approach   Guidance   and   Leg   Advance (Tactical/Visual   Approach).      Once   an   approach   is defined,     the     sequencing     from     EN     ROUTE     to APPROACH guidance is automatic.  When the aircraft is within 30 nm of the FAF or runway extension  point, the  HSI  lateral  deviation  display  scaling  switches  to TERMINAL mode and a CDU annunciation, BAROSET,  reminds  the  pilot  to  enter  the  reported local   barometric   pressure   setting   for   the   airport   of landing.    For  a  tactical  or  visual  approach,  the  HSI lateral deviation display scaling switches to APPROACH  mode  and  the  flight  plan  switches  from automatic  (AUTO)  to  manual  (MAN)  sequence  mode upon  arriving  at  the  FAF  or  runway  extension  point.   Refer to Figure 3C-91. (11)   Published  GPS  Approach  Guidance  and Leg  Advance.    If  the  approach  is  a  published  GPS approach,    the    approach    sequence    is    somewhat different from the tactical or visual approach, as shown in Figure 3C–92. In a GPS approach, the APPROACH annunciation on the CDU flashes when the distance is 2 miles  from the FAF, to alert the pilot of the transition to  approach.    The   APPROACH  annunciation  is  then displayed  steadily  during  the  approach.    At  2  miles from   the   FAF,   the   HSI   deviation   scaling   transitions linearly  from  1.0  nm  full  scale  (TERMINAL)  to  0.3  nm full   scale   (APPROACH)   at   the   FAF   and   the   GPS approach integrity performance is activated.