3-22. EADI AND EHSI COMPOSITE DISPLAY.
If an EADI or EHSI display unit fails, a
composite attitude and navigation format (fig. 3-20), may
be displayed on the remaining display. Selection of the
composite mode is made by turning the applicable DIM
control to OFF. As in normal EADI and EHSI
presentations, all elements are not displayed at the
same time. The presence or absence of each display
element is determined by flight phase, navigation radio
tuning, selected flight director mode, absolute altitude,
etc. The failure, caution, and warning annunciations
function is much the same as for the normal display
functions as a simple fixed-card course
deviation indicator (CDI) for VOR/TACAN
data. As long as the aircraft is headed within
90 degrees of the selected course or
selected radial, and as long as the to-from
annunciation is correct, the course deviation
pointer is directional; otherwise, it will
display reverse sensing and the techniques
required for reverse sensing will apply.
When a localizer has been tuned, and the
aircraft has a heading greater than 90 degrees to the
selected inbound localizer course, the course deviation
indicator (CDI) will reverse sensing so that normal front
course corrections will apply.
3-23. DIGITAL FLIGHT CONTROL SYSTEM (DFZ-
The digital flight control system consists of the
Flight Control Computer (FZ-450).
Stability Augmentation Computer (SZ-400).
Autopilot Controller (PC-400).
Flight Director Mode Selector (MS-207).
Rudder Servo (SM-205).
Elevator and Aileron Servos (SM-200).
Elevator Trim Tab Servo
Flight Control Computer (FZ-450). The flight
control computer provides fail-passive operation of flight
director, autopilot, and pitch trim. Fail-passive operation
is achieved through the use of comparator monitor
Figure 3-18. EHSI Caution Annunciators (Amber)