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Navigation
Doc # DA 201-C1
Rev. 15 34-50-00 Page 1
30 Apr 2009
CHAPTER 34-50
DEPENDENT POSITION DETERMINING
1. General
This Section tells you about the equipment which shows dependent position determining. The
DA20-C1 has these position determining systems:
− NAV - Bendix\King KX 125 VOR, LOC.
− NAV - Indicator\Converter - Bendix\King KI 208 VOR, LOC.
− GPS - Bendix\King KLN 35A.
− GPS - Bendix\King KLX 135\135A. (Option in place of KLN 35A)
− GPS – Garmin GNS430W\GNS530W
− Transponder - Bendix\King KT 76A.
Figure 1: Antenna Locations
Navigation
DA20-C1 AMM
Page 2
30 Apr 2009 34-50-00 Doc # DA 201-C1
Rev. 15
Some aircraft have other dependent position determining equipment as customer options. For
example, second VHF radios, DME or ADF. Refer to the manufacturers manuals for data about
these instruments. Figure 1 shows the antenna locations.
Figure 2: KX 125 NAV COMM
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 0 34-50-00 Page 3
19 Dec 1997
2. Description and Operation
A. Bendix\King KX 125 NAV COMM
(1) Description
Figure 2 shows the KX 125 NAV COMM. The KX 125 is a communications transceiver and
navigation receiver. Refer to Chapter 23-10 for data about the communications functions.
The equipment can receive NAV signals from 108.00 MHz to 117.95 MHz with 50 kHz
channel spacing. This gives 200 channel operation.
The NAV antenna is located in the horizontal stabilizer. Refer to Figure 1.
The VOR\LOC converter in the equipment gives data for the internal course deviation
indicator (CDI). The equipment can also give DME channeling and VOR\LOC composite
output when the related equipment options are installed.
(2) Operation
To operate to the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The
circuit-breaker must be closed. Turn the COMM volume knob clockwise from the OFF
position. The display will show the frequencies last stored in the non-volatile memory.
The NAV frequency selector knobs are located below the NAV frequency display. They
operate only when the PULL OBS knob is pushed in. Turn the large knob to change the
frequency in 1 MHz increments. Turn the small knob to change the frequency in 50 kHz
increments. The frequency will change in the SBY part of the display.
Push the NAV frequency transfer button to toggle the NAV USE and SBY frequencies.
You can enter frequencies directly to the USE display. Push and hold the NAV frequency
transfer button for more than 2 seconds. The SBY display will show the blank symbols (---).
The frequency selector knobs will control the frequency in the USE display.
You can adjust the NAV audio volume with the NAV volume control (marked PULL IDENT).
Pull out the PULL IDENT knob to hear the morse code identifier (IDENT) of the tuned station
as well as voice messages. Push in the PULL IDENT knob to turn off the IDENT.
When you set the equipment ON, it will be in the default CDI mode. Momentarily push the
NAV MODE button to change the mode to BEARING, RADIAL or back to CDI.
Navigation
DA20-C1 AMM
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19 Dec 1997 34-50-00 Doc # DA 201-C1
Rev. 0
(3) CDI Mode
Tune to an active VOR signal. The NAV INFO window shows:
− An OBS annunciator.
− A 3 digit OBS bearing.
− A TO or FROM annunciator.
− Deviation bars. (Each deviation bar equals 0.4 degrees. Each dot equals 2 degrees.
The display limit is ±10 degrees of course deviation).
Pull out the PULL OBS knob to change the OBS setting. Then turn the knob to change the
setting. The OBS annunciator will flash. The NAV frequency selectors will not operate.
If the VOR signal cannot be used, the display shows a FLAG annunciator and all of the
deviation bars.
(4) NAV Bearing Mode
In the NAV bearing mode the NAV INFO window shows a 3-digit display with a TO
annunciator. The received VOR signal bearing is only shown in the TO format.
If the VOR signal cannot be used, the display shows a FLAG annunciator.
(5) NAV Radial Mode
In NAV radial mode, the operation is the same as in the NAV bearing mode. The display
shows an FR annunciator. The data is shown in the FROM format.
Press and hold the NAV MODE button for more than 2 seconds to engage the AUTO-TO
function. The NAV will enter the CDI mode. The received VOR signal bearing in TO format
replaces the OBS setting.
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 0 34-50-00 Page 5
19 Dec 1997
B. Bendix\King KI 208 VOR, LOC Indicator
Figure 3 shows the KI 208 VOR, LOC indicator. The KI 208 indicator receives a composite
　
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