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5 to 1, the audio sidetone will be inhibited.
(2) Secure Mode Test. This test is performed
each time the transmitter is keyed if a TSEC/KY-58 is
installed. A short beep indicates the TSEC/KY-58 is operating
properly. A continuous tone indicates a faulty
TSEC/KY-58.
(3) ECCM Test. When the PRESET switch is
changed while operating in a (FH) mode, the fill data is
examined and either FXXX, if a valid hopset has been
loaded, or FILLn, if no hopset or an invalid hopset has
been loaded, will be displayed. A built-in-test (BIT) is
also run on the non-volatile random-access memory
with the FUNCTION switch in the Z-A position.
3-29
TM 1-1520-238-10
3-30 Change 6
Section III. NAVIGATION
3.11 INTRODUCTION.
The navigation systems of the AH--64 are divided into 3
major groupings: Stand Alone Radio Navigational Aids;
a non--integrated navigation system; and a integrated
navigation system. The stand alone radio navigation
aids consist of the AN/ARN--89 or the AN/ARN 149(V)3
Automatic Direction Finder (ADF) Sets. The non integrated
navigation system consists of the AN/ASN--128
or AN/ASN--137 Doppler Navigation Sets (DNS), the
IP--1552G Computer Display Unit (CDU) and the
Heading Attitude Reference System (HARS). In aircraft
equipped with the non--integrated navigation system,
the installed Doppler Navigation Set performs the
navigation calculations. The integrated navigation system
consists of the Embedded Global Positioning System(
GPS) Inertial (EGI) unit, the Air Data Sensor Subsystem
(ADSS), the HARS, the AN/ASN--137 DNS, the
IP--1552G Computer Display Unit (CDU) and the navigation
software module in the Fire Control Computer
(FCC). In aircraft with the integrated navigation system,
all navigation calculations are performed by the
navigation software module in the FCC. A Data Transfer
Unit (DTU) is used in the integrated navigation system
to provide bulk loading of navigational data.
NOTE
During an electrical system malfunction
and operating on EMERG BATT power,
the HSI/RMI will not provide adequate indications
to the station.
3.12 AUTOMATIC DIRECTION FINDER SET
AN/ARN--89
Direction finder set AN/ARN-89 is an airborne, Low
Frequency (LF), Automatic Direction Finder (ADF) radio
that provides an automatic or manual compass
bearing on any radio signal within the frequency range
of 100 to 3,000 kHz. The ADF displays helicopter bearing
relative to a selected radio transmission. On the pilot
instrument panel, it is shown by the No. 2 bearing
pointer of the Horizontal Situation Indicator (fig 2-9)
On the CPG panel, it is shown on the bearing pointer of
the RadioMagnetic Indicator (RMI) (fig 2-10). The ADF
has three modes of operation that permit it to function
as a Continuous Wave (CW) Automatic Direction Finder,
a (CW) Manual Direction Finder, or as an Amplitude-
Modulated (AM) broadcast receiver. Power to operate
the set is provided through the ADF circuit
breaker on the pilot overhead circuit breaker panel.
3.12.1 Antennas. The ADF antennas (fig 3-1) are located
on the bottom center fuselage area, aft of the Doppler/
Radar Altimeter antenna fairing. The ADF loop
antenna is mounted under the aft fairing. The ADF
sense wire antenna is supported between the aft fairing
and a 7-inch standoff 12 feet aft of the fairing.
3.12.2 Controls and Function. Controls for the AN/
ARN-89 are on the front panel of the C-7392 (fig 3-8)
installed on the pilot right console. The function of each
control is described in table 3-9.
100 KILOHERTZ COARSE
TUNE CONTROL
10 KILOHERTZ FINE
TUNE CONTROL
MODE SELECTOR M01--032
Figure 3-8. Control Panel AN/ARN-89
Table 3-9. AN/ARN-89 Control Functions
Control Function
Mode selector
switch
OFF Turns power to the set OFF.
COMP Provides for operation as an ADF.
TM 1-1520-238-10
Table 3-9. AN/ARN-89 Control Functions - continued
Control Function
ANT AM Provides for operation as an receiver using the sense antenna.
LOOP Provides for receiver operation as a manual direction finder using only the loop antenna.
-LOOP L-R control Manually provides for left and right control of the loop when the mode selector switch is
knob in the LOOP position. This control knob is spring-loaded to return to center.
AUDIO Adjusts audio volume for station identification.
KILOHERTZ tune
controls
100 KHz coarse Tunes receiver in 100 KHz steps as indicated by first two digits of the KILOCYCLES
tune control knob indicator.
10 KHz fine tune Tunes receiver in 10 KHz steps as indicated by last two digits of KILOCYCLES
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