TM 55-1510-222-10
Figure 3-12. Turn and Slip Indicator
output
to
decrease
(move
in
counter-clockwise
direction).
d. Normal Operation.
(1) Alignment procedure:
1. Gyro compass slave-free switch
SLAVE.
2. Gyro compass increase-decrease
switch Hold switch momentarily in the
direction desired, and then release.
This will place system in fast erect
mode. The gyro will then erect at
approximately
30
degrees
per
minute. While in the fast erect mode,
the HEADING flag (HSI) will be in
view. When the HEADING flag
retracts
from
view,
the
heading
displayed
will
be
the
magnetic
heading.
(2) To determine magnetic heading:
1. Gyro compass slave-free switch
SLAVE.
2. RMI rotating heading dial (compass
card) - Read heading.
(3) To determine directional gyro heading:
1. Gyro compass slave-free switch
FREE.
2. Gyro compass increase-decrease
switch Hold until the RMI compass
card
aligns
with
the
magnetic
heading, then release.
3. Read heading. The heading will agree
with the appropriate HSI.
e. Shutdown Procedure. Both compass systems
are shut down when both the INVERTER NO. 1 and
INVERTER NO. 2 switches are turned off. (If either
inverter is on, both compass sets will be energized.)
3-21. ALTITUDE SELECT CONTROLLER (AL-800).
a. Description. The Altitude Select Controller
(FIG. 3-13) provides a means for setting the desired
altitude reference for the altitude alerting and altitude
preselect system.
(1) Selected altitude display. Displays selected
value.
3-27
