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result in a fail tone and the display will indicate
FAIL FP (Front Panel.
(9) Press the INIT pushbutton switch. An →
(right arrow) is displayed.
(10) Press the → (right arrow) pushbutton
switch. An ↑ (up arrow) is displayed.
(11) Press the ↑ (up arrow pushbutton switch. PT
is displayed.
(12) Set the MODE control switch to PT. CT is
displayed.
(13) Set the MODE control switch to CT. RK is
displayed.
(14) Set the MODE switch to RK. OFL is displayed.
(15) Set the MODE control switch to OFFLINE.
Eb is displayed.
(16) Set the MODE control switch to EB. PRESET
will be momentarily displayed, followed by MAN.
(17) Set the PRESET switch to MAN. A ’1’ is
displayed.
(18) Set the PRESET switch to 1. A ’2’ is displayed.
(19) Set the PRESET switch to 2. A ’3’ is displayed.
(20) Set the PRESET switch to 3. A ’4’ is displayed.
(21) Set the PRESET switch to 4. A ’5’ is displayed.
(22) Set the PRESET switch to 5. A ’6’is displayed.
(23) Set the PRESET switch to 6. A pass tone will
be heard indicating that the panel test was completed
successfully.
(24) Upon completion of the USER tests, the
menu will sequence to VERSION. Exit the user test mode
at this time by rotating the MODE control switch out of the
OFFLINE position.
Figure 3-2-9. Remote Control Unit TSEC/KY-100
(Z-AVH)
Figure 3-2-10. LCD Display TSEC/KY-100 (Z-AVH)
TM 1-1520-240-10
3-3-1
SECTION III. NAVIGATION EQUIPMENT
3-3-1. VHF NAVIGATION AND INSTRUMENT LANDING
SYSTEM (AN/ARN-123).
The VHF navigation and instrument landing system (AN/
ARN-123) is an integrated navigation receiver consisting of
a 160 channel VOR receiver, a 40-channel localizer receiver,
a 40 channel glideslope receiver, and a market beacon
receiver. Each receiver operates independently. The system
consists of a control panel on the console, a receiver
on the avionics shelf, and three antennas on the fuselage.
The set includes VOR and marker beacon self-test capability.
a. VOR/Localizer Receiver. The VOR/localizer receiver
processes signals in the frequency range 108.00
through 117.95 MHz. The VOR/localizer information is presented
on the course deviation bar of the HSI on the pilot’s
and copilot’s instrument panels. VOR bearing information is
displayed on the No. 2 pointer of the indicator. If the received
signal is weak or the set malfunctions, a red NAV flag will
appear on the indicator. The VOR/localizer antenna is on the
bottom of the helicopter at sta. 79.
b. Glideslope Receiver. The glideslope receiver section
of the AN/ARN-123 processes signals in the frequency
range of 329.15 through 335.00 MHz. Glideslope information
is displayed on the HSI. The set will also cause a red
GS warning flag to appear on the indicator when the received
signal is unreliable or the glideslope receiver malfunctions.
The glideslope antenna is on the forward pylon
above the windshield.
c. Marker Beacon Receiver. The marker beacon receiver
is a fixed -frequency receiver (75 MHz) which receives
signals from a ground marker beacon transmitter
to determine helicopter position. The audio output of the
marker beacon receiver is applied through the interphone
system to the headsets as a direct input (no interphone
control box switch setting necessary). Three
marker beacon lights are on each HSI MODE SELECT
panel. The lights are labeled MKR BCN and indicate
marker beacon passage. Also specific tones will be
heard over the interphone while flying over each beacon.
Table 3-3-1 presents the indication as each beacon is
passed. The lights are tested by momentarily pressing
any one of three lights. The marker beacon antenna is
under the fuselage is under the fuselage forward of the
forward cargo hook. Power to operate the set is from the
DC essential bus through the NAV VOR circuit breaker
on the No.1 PDP. Power is supplied by the 26-volt AC
instrument bus through the NAV VOR circuit breaker on
the No. 1 PDP.
Table 3-3-1. Marker Beacon Indicator
BEACON LIGHT COLOR TONE (HERTZ)
Outer (O) Blue/Green 400
Middle (M) Blue/Green 1300
Inner (I) Blue/Green 3000
3-3-2. OPERATION CHECK/SELF - TEST.
NOTE
This test requires an external VOR RF signal
generated by a ground station, or ramp test
set.
a. Set the course indicator OBS control for a 315
degrees indication under the course index.
b. Move the control unit VOR/MB switch to the test
position (down).
c. The CDI deviation needle should indicate center
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