TM 55-1510-221-10
illuminated on the mode selector. When reaching
the bracket altitude, the system automatically
switches to the ALTSEL CAP mode and the previ-
ously selected pitch mode is cancelled. When the
altitude is reached, the ALTSEL CAP mode is auto-
matically cancelled and the Flight Director switches
to the ALT hold mode. If the air data computer is
not valid, the altitude preselect mode cannot be
selected. The ADI command cue will bias out of
view if the VG is not valid.
(13.) Standby Mode (SBY). The Standby
Mode is selected by depressing the SBY button on
the mode selector. This resets all the other flight
director modes and biases the ADI command cue
from view. While depressed, SBY acts as a lamp test
causing all mode annunciators to illuminate and the
flight director warning flag on the ADI to come in
view. When the button is released, the mode annun-
ciator lights extinguish and the flight director warn-
ing flag retracts from view.
(14.) Go-Around Mode. The Go-Around
Mode is selected by depressing the remote go-
around switch. When selected all other modes are
reset, and the remote go-around (GA) and yaw damp
(YD ENG) annunciators will be illuminated. The
ADI command cue receives a wings level command
(zero command when roll is zero). The command
cue also receives the go-around command which is
a 7-degree visual pitch up attitude command. Select-
ing GA disconnects the autopilot. However, the yaw
damper remains on.
Once go-around is selected any roll mode can be
selected. The wings level roll command will cancel.
The go-around mode is cancelled by selecting
another pitch mode, or CWS.
f. Autopilot Controller.
(1.) Description. The autopilot controller
(fig. 3-23), provides the means of engaging the
autopilot and yaw damper as well as manually con-
trolling the autopilot through the turn knob and
pitch wheel. The autopilot system limits are shown
in Table 3-1.
(2.) Controls/Indicators and Functions
(Autopilot Controller, fig. 3-23):
1.
PITCH WHEEL. Movement of
the pitch wheel will cancel only
ALT HOLD, and ALTSEL CAP.
With vertical modes of VS or IAS
selected on the mode selector,
rotation of the pitch wheel will
change the respective displayed
vertical mode reference. VS or
IAS modes may be cancelled by
pressing the mode button on the
Figure 3-23. Autopilot Con troller
3-42
