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– Push key once to
directly tune active frequency
with tuning knobs
– Push key twice to
select ADF main page
ADF Mode Key
ANT
ADF
Selects either ADF or antenna
functions:
– Used for range
navigation, optimum station
tuning, or monitoring.
– Used to select directional
antenna which seeks signal
source. Bearing to selected
station is displayed on the HSI
portion of the primary flight
display or the multifunction
display.
VOICE / BOTH Switch
VOICE
BOTH
– Station identification
CW signals are filtered out of
VOR, ILS and ADF audio
– Station identification
and voice signals are audible
AUDIO CONTROL PANELS
ADF Main Level Page
Used to select ADF modes and
frequencies
FREQ Readout
Indicates active ADF frequency
ADF Receive Switches
Press to monitor selected ADF
receiver.
Press again to deselect ADF
receiver audio.
Rotate to increase volume
TEST
Initiates self-test. Pointer rotates
90° CCW, tone activates
P604_17_031
RTU
(Pilot Shown)
RTU
(Pilot Shown)
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-73
P I LOT T R A I N I N G GU I D E
Air Traffic Control (ATC) Transponder System
Description
The ATC Transponder system is an automatic altitude and identification reporting unit
which responds to ground ATC interrogators and airborne traffic alert and collision
avoidance system (TCAS) interrogators.
There two Air Traffic Control transponders, ATC 1 and ATC 2. The transponders have
three modes of operation:
• Mode A - aircraft identity reporting
• Mode C - altitude reporting
• Mode S - data links with other mode C and S transponders for the traffic collision
avoidance system (TCAS)
Components and Operation
Transponder
The solid-state transponders receive and decode air traffic control interrogations and
reply automatically. The system can receive but cannot reply to interrogations when on
the ground.
The ATC 1 system is powered by the DC Essential Bus, and the ATC 2 system is
powered by DC Bus 2.
Antennas
Each transponder system has two paired antennas. Each system has an upper and
lower antenna located on the forward fuselage.
NAVIGATION SYSTEMS
17-74 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Controls and Indicators
ATC Selector Knob
The ATC selector knob is located on the REVERSIONARY / INHIBIT panel of the
center pedestal. The selector has three positions: 1, STBY and 2. When ATC 1
transponder is selected, it uses altitude information from ADC 1 to respond to mode C
and mode S interrogations. ATC 2 receives altitude information from ADC 2. When
either transponder is selected, the RTU four-digit identification code turns green.
When in STBY, the RTU code is white.
In RVSM airspace, the pressure altitude source for the
transponder must be the same as the pressure source used by
the automatic altitude control system (i.e., the flight director and
autopilot). If flight director 1 is in use, select ATC 1 as the
transponder. If flight director 2 is in use, select ATC 2 as the
transponder.
Code Selection
Selection of ATC identification code and altitude reporting are performed via the ATC
Main Page on the RTUs. The TUNE page on the FMS permits manual selection of the
ATC code.
NOTE
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-75
P I LOT T R A I N I N G GU I D E
Transponder Controls (RTU)
Figure 17-53
IDENT
DME-H
1/2
BRT
BRT
ALT
4567
ATC
RETURN
TONE
ON OFF
41000
STBY R
IDENT
DME-H
1/2
BRT
BRT
108.50
ACT PRE
109.00
NAV1
ACT PRE
123.45 134.92
COM1
195.5
ADF1 TCAS
AUTO
ATC1
NEXT
PAGE 4567
TONE
REL
ALT OFF ID
IDENT Pushbutton
ATC Identification Code
Selector Key
ATC Identification Code
Display
Altitude Mode Off Indicator
STBY Mode
Top Level Page
Tune Indicator
Tune Window
Altitude Mode Selector Key
ATC Main Page
Reply Indicator
Reported Altitude Display
Standby Mode Indicator
P604_17_037
IDENT Indicator or R For
Reply
17-76 For Training Purposes Only
May 03
NAVIGATION SYSTEMS P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
NAVIGATION SYSTEMS
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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