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NAVIGATION SYSTEMS
Automatic Direction Finder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Automatic Direction Finder --- Controls <1015>
Figure 18---40---4
Bearing Pointers
Indicates direction of
selected bearing.
Single lined (bearing No. 1)
is magenta. Double lined
(bearing No. 2) is cyan.
Bearing Source
Indicates navigation source
selected to obtain bearings.
Single lined (bearing No. 1)
is magenta. Double lined
(bearing No. 2) is cyan.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Multifunction Display -- HSI Mode
Pilot’s and Copilot’s Instrument Panels
Vol. 1 18--40--6
NAVIGATION SYSTEMS
Automatic Direction Finder Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Automatic
Receiver
ADF 1 DC
ESSENTIAL 2
V4
Direction
Finder
ADF 2 DC BUS 2
H7
Vol. 1 18--50--1
NAVIGATION SYSTEMS
Distance Measuring Equipment REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. DISTANCE MEASURING EQUIPMENT
There are two identical distance measuring equipment (DME) systems installed in the
aircraft. The DME system computes and displays the straight line distance between the
aircraft and a selected DME ground station. The DME system also provides ground speed,
time to station and station identification.
There are two DME transceivers installed in the avionics compartment that operate in the
frequency range of 962 to 1213 MHz with a range of 300 nautical miles. Each transceiver
has three channels that can track up to three stations simultaneously. Channel 1 of each
DME is paired with the onside VOR and can be manually tuned by either the radio tuning
units, backup tuning unit or the FMS. The other two channels are automatically tuned by the
FMS for multisensor navigation. If Autotune is selected on the control display unit, the FMS
will automatically tune VOR/DME channel 1.
The DME transceivers interrogate the ground stations by transmitting a 63 MHz pulse signal
at a specific repetition rate. The ground station replies by transmitting an exact replica of the
signal it recieved. When a reply is received by the DME, it measures the elapsed time
between transmit signal and the reply, then computes slant distance, ground speed and
time--to--go.
DME hold allows the pilot to use DME channel 2 for distance measuring and allows the
normally paired VOR frequency of channel 1 to be tuned to a different VOR frequency for
bearing information.
Frequency tuning and DME hold selections are through the radio tuning units. The DME
frequency channels are paired with the VHF navigation channels. The frequency selection
is done with the pilot’s or copilot’s RTUs in the frequency range of 108.00 to 117.95 MHz.
Station audio is monitored through the audio control panels. Visual indications of tuned
stations, distance readouts and DME hold indications are provided on the primary flight
displays and multifunctional displays.
Vol. 1 18--50--2
NAVIGATION SYSTEMS
Distance Measuring Equipment REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Distance Mesuring Equipment System Interface <1015>
Figure 18---50---1
AUDIO ELECTRONIC
CONTROL UNIT
IAPS
FMS
TCAS
X--TALK
RX AUDIO
PORT A
PORT B
ECHO
PORT C
RX AUDIO
PORT A
PORT B
ECHO
PORT C
SUPPRESSION INPUT/OUTPUT
DME 1 DME 2
DME
ANT 1
DME
ANT 2
ATC 1
ATC 2
AUDIO CONTROL PANELS
DC
BUS 1
DME 1
CBP1--H14
DC
BUS 2
DME 2
CBP2--H14
Vol. 1 18--50--3
NAVIGATION SYSTEMS
Distance Measuring Equipment REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Distance Measuring Equipment Radio Tuning Unit<1012>
Figure 18---50---2
DME--H
Holds DME to current NAV
frequency and allows NAV
receiver to be independently
re--tuned.
Radio Tuning Unit -- NAV Main Page
Center Pedestal
Frequency Change Key
Push key once to directly tune
DME transceiver with tuning knob.
DME Frequency Readout (green)
DME hold Indicator (yellow)
Displayed when DME hold
has been selected.
TUNING KNOB
DME hold Indicator (yellow)
Displayed when DME hold has
been selected.
Radio Tuning Unit -- Top Level Page
Center Pedestal
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