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34-49-01
Aug 25/84
 ATC SYSTEM - DESCRIPTION AND OPERATION
______________________________________
 1.  General_______(See figure 1.)
 A.  The air traffic control (ATC) system, when interrogated by a ground station, automatically transmits a pulse coded reply signal to the ground station. This reply signal is used to identify and locate airplane equipped with ATC equipment for air traffic control. The reply signal is used to display airplane range, bearing, altitude, and identity on the ground station radarscope.
 B.  The ATC system is comprised of two independent ATC transponders located in the main equipment center. (See figure 1.) Each transponder is connected to an ATC antenna located forward on the lower side of the airplane. A common ATC control module provides pilots' controls for both transponders.
 C.  ATC 1 transponder receives 115-volt ac power from the standby bus via the ATC 1 AC circuit breaker (Fig. 2). The operating power for ATC 2 transponder is derived from radio bus No. 2 via the ATC 2 AC circuit breaker.
 D.  Interface between the ATC system and other systems on the airplane is as shown on figure 2. Since the ATC and DME systems are both pulse coded and operate in the same frequency range, a signal suppression system is connected between the two systems to prevent interference.
 2.  ATC Control Module
__________________
 A.  The ATC control module is common to both ATC 1 and ATC 2 transponders. The control module contains controls, switches, and indicators to permit the pilot to operate and monitor the ATC system.
 B.  On AF ALL; AZ ALL; GN ALL; LH ALL; MD ALL; SN ALL; VM ALL, the position of the function selector switch determines the operational status of OFF, STBY (standby) mode A or B of the ATC transponder selected by the ATC switch. The ATC switch also determines whether CADC 1 or 2 supplies altitude data to the ATC system. The ALT REPORT or ALT RPTG switch enables or inhibits the selection of altitude data from the central air data system.
 C.  On AT ALL, the position of the ATC transfer switch determines the operational status: the STBY position disables the encoders in both transponders; position 1 turns on transponder No. 1, with No. 2 at standby; position 2 turns on transponder No. 2 with No. 1 at standby. The mode select switch enables the selection of mode A or B. The ALT RPTG switch enables or inhibits the selection of altitude data from the Central Air Data System.
 D.  On LH 001-010, 031-050, 071-081; AZ 201-219; SN 301, 302, the four identification coding select switches set the 4-digit code in the display window. The TEST button when pressed simulates a received interrogation. The MONITOR light indicates that the transponder is transmitting coded replies. The IDENT button when pressed causes an identification pulse to be inserted in each transmitted reply.
 EFFECTIVITY
 LH ALL; AT ALL; AZ ALL; GN

 ALL; MD ALL; SN ALL; AF  152-199; VM ALL; EXCEPT  CONFIG 1 AIRPLANES WITH EAB 34-587  03 Page 1 AND 34-607  Apr 25/96

34-53-00
SEEA
FUNCTION SELECTOR
STBY A OFF B
12 ATC ATC SWITCH
ATC ANTENNA NO. 1
ATC ANTENNA NO. 2
ATC TRANSPONDERS (E3-6)
SEE B
MONITOR
LIGHT
SELF-TEST SWITCH AND REPLY LIGHT
ANT COAX
SUPPRESSION CONNECTOR
PULSES COAX CONNECTOR
ATC TRANSPONDER
IDENTIFICATION
CODING
B SWITCHES
CODE ALT REPORT
00.00
ALT RPTG SWITCH
OFF
MONITOR
g
r
IDENT TEST
ATC CONTROL MODULE
A
Air Traffic Control System Component Location
Figure 1 (Sheet 1)

EFFECTIVITY

CONFIG 1
LH 001-010,031-050,071-081;
703 Page 2
AZ 201-219; SN 301,302
34-53-00
Dec 25/90
AFT CONTROL STAND
ELECTRONICS PANEL

ATC 
ATC  ANTENNA 
CONTROL  NO. 1 
MODULE 
SEE  A  ATC ANTENNA 
NO. 2 
MAIN 
EQUIPMENT 
CENTER 
ATC TRANSPONDERS 
(E3-6) 
SEE  B 
R/T FAULT INDICATOR 
ANT FAULT INDICATOR 
RESET SWITCH 
IDENTIFICATION 
CODING SELECT  SELF-TEST 
FUNCTION  SWITCHES  SWITCH AND 
SELECTOR  REPLY LIGHT 

FAULT REPLY STBY A B
a g ATC TRANSPONDER
0000 B
r TEST ALT RPTG 12 IDENTIFICATION
ATC IDENT OFF CODING SELECT SWITCHES
ATC SWITCHATC CONTROL MODULE 1
A
ATC FAULT REPLY 12
ATC 0000 ag
SWITCH STBY
MODE  ALT RPTG 
IDENT  TEST 
MODE  A  B  1  2 
　
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