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sends replies with a signal that is above or below the airborne DME frequency by 63 MHz.
When a reply is received by the DME, it measures the elapsed time between the transmitted
signal and the reply, then computes the slant distance, ground speed and time--to--go to the
ground station.
The DME hold function splits the paired tuning between DME and VHF navigation systems
to enable independent operation. The DME hold function holds the DME transceiver to the
current VHF navigation frequency and permits the VHF navigation receiver to be
independently tuned. The DME frequency can also be tuned independently while the VHF
navigation receiver is kept at the current frequency.
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.
REV 56, Jan 31/03
Vol. 1 18--50--2
NAVIGATION SYSTEMS
Distance Measuring Equipment
Flight Crew Operating Manual MASTER
CSP A--013
Distance Measuring Equipment System Interface <MST>
Figure 18---50---1
AUDIO ELECTRONIC
CONTROL UNIT
FMS
X--TALK
RX AUDIO
PORT A
PORT B
DATA
OUTPUT
PORT C
RX AUDIO
PORT A
PORT B
DATA
OUTPUT
PORT C
DME 1
TRANSCEIVER
ANTENNA ANTENNA
DC
BUSS 1
DME
2
CBP2--H10
DME
1
CBP1--H10
DC
BUS 2
<0015> <0015>
AUDIO CONTROL PANELS
IAPS
<0011> <0008> <0014>
<0008> <0014> <0060>
<0060>
<0008> <0011> <0014>
DME 2
TRANSCEIVER
TCAS
SUPPRESSION INPUT/OUTPUT
ATC 1
ATC 2
<0024><0050>
Vol. 1 18--50--3
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Distance Measuring Equipment
Flight Crew Operating Manual
CSP A--013
MASTER
Distance Measuring Equipment Radio Tuning Unit <MST>
Figure 18---50---2
Frequency Change Key
Push key once to directly tune
DME transceiver with tuning knob.
DME--H
Holds DME to current NAV
frequency and allows NAV
receiver to be independently
re--tuned.
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
Radio Tuning Unit -- NAV Main Page
Center Pedestal
NAV Key
Push key twice
to select NAV
main page.
<0012> <0012>
<0024><0050>
<0024><0050>
REV 56, Jan 31/03
Vol. 1 18--50--4
NAVIGATION SYSTEMS
Distance Measuring Equipment
Flight Crew Operating Manual MASTER
CSP A--013
Distance Measuring Equipment --- Audio Control Panel and Indications <MST>
Figure 18---50---3
1 -- DME -- 2
Press to monitor selected
DME transceiver. When lit,
rotate to increase volume.
Press again to deselect
DME station identification
audio.
Distance Readout
Indicates distance to tuned
navaid or next waypoint, in
nautical miles. Color matches
navigation source.
DME Hold (H) Symbol (yellow)
When DME hold is selected,
H replaces NM legend on distance
readout. Not displayed if FMS is
navigation source.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Audio Control Panel
Center Pedestal
<0011> <0008> <0014> <0060>
PA
PA
<0008> <0014> <0060>
<0015>
<0008> <0011> <0014>
Vol. 1 18--50--5
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Distance Measuring Equipment
Flight Crew Operating Manual
CSP A--013
MASTER
Distance Measuring Equipment --- Multifunction Display
Figure 18---50---4
Distance Readout
Indicates distance to tuned navaid
or next waypoint, in nautical miles.
Color matches navigation source.
DME Hold (H) Symbol (yellow)
When DME hold is selected, H
replaces NM legend on
distance readout. Not displayed
if FMS is navigation source.
Ground Speed Readout (white)
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