d. Normal Operation.
(1) Function Selection. Position the power
and mode switch to ANT, ADF, or TONE.
preceding frequency select procedures, tune the ADF
until the desired frequency is indicated in the active
frequency display and verify the station identifier.
(a) ANT Function. Position the power
and mode switch to ANT. The RMI pointer will park
horizontally. Select ADF on the audio system and
adjust the volume.
(b) ADF Function. Position the power
and mode switch to ADF. The RMI pointer will
indicate relative bearing to the turned station.
When the ADF system is not receiving a
reliable signal, the RMI pointer will remain
parked in the ADF mode. The ADF may
momentarily park during station crossings
because of signal loss. If the bearing
pointer fails to respond as indicated or ID
is lost in ANT position, the ADF should be
considered unreliable and will not be used
for navigation or approaches.
(c) TONE Function. Position the power
and mode switch to TONE. A 1000-Hz tone will
identify keyed CW stations.
If the si gnal received is weak or of poor
quality, the bearing pointer rotation will be
1. Position the power and mode switch to
ADF and tune a nearby NDB, outer
marker, or broadcast station and press the
TEST button. The RMI pointer will rotate
90° from the previous valid indication.
2. Release the TEST button and verify that
the RMI pointer returns to that indication.
Select ANT on the ADF control panel.
Bearing pointer should point horizontally,
and a valid aural navaid identifier (ID)
3. Select ADF on the control panel. The
bearing pointer should return to the proper
Refer to Chapter 3D for detailed information.
3B-26. FMS 1 DATA LOADER.
A Data Loader for the FMS 1 is located on the
lower pedestal. A Data Loading Cartridge is used to
load flight plans, save flight data, and provide access
to ICAO identifier. Refer to Paragraph 3B-19u for a
detailed description of the Data Loader Operations.
3B-27. ALTITUDE SELECT CONTROLLER.
a. Description. The Altitude Select Controller,
located in the center of the instrument panel, provides
a means for setting the desired altitude reference for
altitude alerting and altitude pre-select system. Refer
to Figure 3B-139.
b. Altitude Alert. As the aircraft reaches a
point 1000 feet from the selected altitude, a signal is
generated to light the warning light on the altimeter
and sound a warning horn for 1 second. This light
remains on until the aircraft is 300 ± 50 feet or more
from the selected altitude, the light is again energized
and the horn is sounded. The light remains on until
the aircraft returns to within 300 ± 50 feet or deviates
more than 1000 feet from the selected altitude.
c. Altitude Pre-select. The altitude is selected
by turning the selector knob until the altitude display
reads the desired value. No further actin is taken on
the controller. To initiate altitude pre-select, the
ALTSEL button is selected on the flight director
controller. The pilot must initiate a maneuver to fly
toward the pre-selected altitude. Any of the following
pitch modes may be engage: Pitch Hold, Airspeed
Hold, or Vertical Speed Hold. Upon initiation of
altitude pre-select capture, the previously selected
pitch mode is automatically reset.
Figure 3B-139. Altitude Select Controller