TM 1-1510-223-10 ALT rate is less than 5 feet per second At  this  time,  the  altitude  select  (ALT  SEL)  mode  will be  dropped  and  the  system  will  be  placed  in  the  altitude hold (ALT) mode. The ALT SEL CAP mode will be dropped and the ALT SEL ARM mode will be automatically reselected following an   ALT   SEL   knob   motion   or   a   pitch   wheel   actuation Perform the following steps to fly to a preselected altitude using the altitude select mode (ALT SEL): 1. Set selected altitude on altitude preselector. 2. Select pitch hold, VS, or IAS mode descend or ascend toward selected altitude. 3. Depress ALT SEL pushbutton switch- indicator on flight director mode selector panel.  ALT SEL mode is now armed. The altitude flare point (ALT SEL CAP) is a nonlinear function,  dependent  upon  vertical  speed  and  distance  to the selected altitude. 4. ALT SEL capture is dropped and ALT HOLD is automatically engaged. The ALT SEL capture submode is cancelled by: Moving the ALT SET knob on the altitude preselector Moving the pitch wheel on the autopilot controller Selecting on or captured any other vertical mode Coupling to the cross-side EFIS Selecting   an   alternate   ATT   source   on   the   display controller (17) Go-around  mode  (wings  level).    The  go- around   mode   is   normally   used   to   transition   from   an approach    to    a    climb    when    a    missed    approach    has occurred. Go-around mode is selected by depressing the go-around  switch  located  on  the  left  power  lever.    With go-around selected, all flight director modes are cancelled,  and  the  autopilot  is  disengaged  The  pilot  will see  a  wings  level  command  and  a  7-degree  climb  angle will   be   presented   on   the   EADI.      When   go-around   is selected,  the  autopilot  will  automatically  disengage,  and the yaw damper will automatically engage. 3-24. VHF NAVIGATION RECEIVERS (VIR-32). a. Introduction.   The  VHF  navigation  receivers  (fig. 3-24), provide 200 50-kHz spaced VOR/localizer channels from 108.00 through 117.95 MHz, 40 glide slope channels automatically paired with localizer channels, and a marker beacon receiver.  The digital navigation receiver provides VOR, LOC, and GS deviation outputs, high and low level flag   signals,   magnetic   bearing   to   the   station,   to/from information,  marker  beacon  lamp  signals,  and  VOR  and marker  beacon  audio  outputs.    The  navigation  receivers are powered through the 2-ampere VOR # 1 and VOR #2 circuit  breakers,  located  on  the  overhead  circuit  breaker panel (fig. 2-7). b. VHF   Navigation   Receiver   Control   Unit   Controls and  Functions.    All  operating  controls  for  the  navigation receiver  are  located  on  the  CTL-32  navigation  receiver control  unit  (fig.    3-24).    The  VHF  navigation  receiver control unit also controls the DME function of the TACAN when it is operated in DME mode. (1)   Active frequency display. The active frequency (frequency to which the receiver is tuned) and diagnostic messages are displayed in the upper window. (2)   Transfer/memory  switch.   This  switch  is  a  3- position    spring-loaded    toggle    switch    placarded    XFR/ MEM,  which,  when  held  to  the  XFR  position,  causes  the preset frequency to be transferred up to the active display and  the  receiver  to  be  retuned.    The  previously  active frequency will become the new preset frequency and will be  displayed  in  the  lower  window.    When  this  switch  is held to the MEM position, one of the four stacked memory frequencies    will    be    loaded    into    the    preset    display. Successive pushes will cycle the four memory frequencies through the display. (3)   Store   switch.     This  switch,  placarded  STO, allows  up  to  four  preset  frequencies  to  be  selected  and entered  into  the  control  unit's  memory.    After  presetting the  frequency  to  be  stored,  the  STO  switch  should  be pushed.  The upper window displays the channel number of  available  memory  channel  (CH  1  though  CH  4)  while the lower window continues to display the frequency to be stored For approximately 5 seconds, the MEM switch may be used to advance through the channel numbers without changing the preset display.  The STO switch is pushed a second time to commit the preset frequency to memory in the  selected  location  After  approximately  5  seconds,  the control will return to normal operation. (4)   Tuning  knobs.    Two  concentric  tuning  knobs control   the   preset   or   active   frequency   displays.      The larger  knob  changes  the  three  digits  to  the  left  of  the decimal point in 1-MHz steps.  The smaller knob changes the two digits to the right of the decimal point in 0.05 MHz steps. The two frequency select switches are independent  of  each  other  so  that  the  upper  and  lower rollover  of  the  0.1  MHz  digit  will  not  cause  the  1.0  MHz digit to change. 3-56