row contains the vertical modes. The split light switch-
indicators illuminate amber for armed conditions and
green for captured conditions. Mode status is
annunciated on both EADI's. If more than one lateral or
vertical mode is selected, the flight director system
automatically arms and captures the submode.
placarded HDG, will illuminate the ON indicator on the
face of the switch and will command the flight control
computer to follow the inputs of the heading marker
located on the heading dial of the coupled EHSI.
placarded NAV, will cause the flight control computer to
arm, capture, and track the navigation signal (VOR,
LOC, TACAN, or LNAV) which has been selected as the
navigation source for the EFIS. When approach (APR)
has been selected, the navigation (NAV ) select switch-
indicator will annunciate lateral tracking status.
placarded APR, will select the appropriate gains to arm
and capture the lateral navigation signal for localizer
(LOC) and vertical navigation signals for the glideslope.
Except for an ILS, when approach is selected, the NAV
switch will annunciate the appropriate arm or capture
Depressing the back course mode switch-indicator,
placarded BC, will command the flight control computer
to track the localizer back course, and will illuminate the
ARM or CAP indicators on the switch face as
(5) VOR approach mode switch-indicator.
placarded VOR APR, will select the appropriate gains for
capturing and tracking a VOR during the approach
phase of flight, and will illuminate the ARM and CAP
indicators on the switch face when appropriate.
placarded SBY, will remove all the selected flight
director modes, forcing the command bars to be
removed from the EADI, and will illuminate the SBY
indicator located on the switch face.
Indicated airspeed hold mode switch-
indicator. Depressing the indicated airspeed hold mode
switch-indicator, placarded IAS, will command the
system to maintain the current indicated airspeed or to
allow a new
1. Pitch Wheel
2. Bank Limit Switch-Indicator
3. Sort Ride Switch-Indicator
4. Turn Knob
5. Yaw Damper Switch-Indicator
6. Autopilot Switch-Indicator
7. Trim Annunciators
Figure 3-21. Autopilot Controller