TM 1-1510-224-10 Vertical speed mode may be cancelled by: Depressing  the  VS  pushbutton  switch-indicator on the flight director mode selector. Selecting another vertical mode. Selecting the go-around mode. Selecting the standby mode. Coupling to the cross-side EFIS. Selecting an alternate ATT source on the display controller. (14)Indicated airspeed hold mode. Activation of the IAS pushbutton indicator-selector switch on     the     flight     director     mode     selector     automatically commands   the   flight   director   to   maintain   the   present indicated   airspeed.      The   referenced   airspeed   can   be changed by depressing the touch control steering (TCS ) switch  on  the  control  wheel,  maneuvering  the  aircraft  to a new indicated airspeed, then releasing the  TCS switch. The  airspeed  reference  can  also  be  changed  by  using the  pitch  wheel  on  the  autopilot  controller.    When  the airspeed     mode     is     engaged, IAS    (green)     will     be annunciated   on   the   EADI,   and   the   indicated   airspeed target  will  be  displayed  in  the  lower  left  corner  of  the EADI.          Actual     aircraft     indicated     airspeed     will     be displayed on the airspeed indicator.  When the indicated airspeed  hold  mode  is  selected,  all  previously  selected vertical modes will be reset. The  indicated  airspeed  mode  may  be  cancelled by: Depressing the   IAS  pushbutton  switch-indicator on the flight director mode selector Selecting another vertical mode Selecting go-around Coupling to the cross-side EFIS (15)Altitude  hold  mode.      The   altitude   hold mode  is  a  vertical  flight  director  mode  which  is  used  to maintain   a   barometric   altitude   reference.      The   vertical command   for   altitude   hold   is   displayed   on   the   flight director   pitch   command   cue   on   the   EADI.      To   select altitude    hold,    depress    the    ALT    pushbutton    switch- indicator   located   on   the   flight   director   mode   selector, while  operating  in  any  lateral  mode.    The    ALT  (green) annunciator will be illuminated on the EADI while altitude hold   mode   is   active.      The   vertical   axis   of   the   flight director  will  maintain  the  barometric  altitude  at  the  time of  mode  engagement.    The  reference  altitude  may  be change  by  depressing  the  touch  control  steering  (TCS) switch  on  the  control  wheel,  maneuvering  the  aircraft  to the desired altitude, then releasing the  TCS switch. The altitude hold mode can be cancelled by: Moving the pitch wheel on the autopilot controller. Depressing  the  ALT  pushbutton  switch-indicator on the flight director mode selector. Selecting any other vertical mode. Coupling to the cross-side EFIS. Selecting an alternate ATT source on the display controller. (16)Altitude   preselect   mode.      The   altitude preselect  (ALT  SEL)  mode  is  used  in  conjunction  with another   vertical   mode   to   achieve   automatic   capture, flare, and level-off onto a preselected altitude.  The   ALT SEL   mode    is    armed    by    depressing    the    ALT    SEL pushbutton  switch-indicator  on  the  flight  director  mode selector.  The desired altitude is entered into the altitude preselector display window using the  SET knob. When armed, the ALT SELL mode is annunciated on the EADI.  Vertical speed hold mode (VS HOLD), indicated airspeed hold (IAS ),  or  pitch  hold  can be  used  to  fly  to  the  selected  altitude.    When  reaching the bracket altitude, the system automatically switches to the ALT SEL CAP mode and the previous pitch mode is cancelled. A command is then generated to asymptotically  capture  the  selected  altitude.    The    ALT SEL  mode  is  cancelled  in  altitude  hold  (ALT)  or  after glideslope capture.   ALT SEL capture is annunciated on the   EADI   by   a   green    ASEL    at    the    vertical    capture annunciation    location.        To    indicate    the    transition    to capture,   ASEL   will   be   enclosed   in   a   white   box   for   5 seconds. The aircraft will remain in the   ALT  SEL  capture mode until the following conditions exist simultaneously: ALT error is less than 25 feet 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): 3-56