(c)
Close following circuit breakers on electronic circuit breaker panel P7. ATC 1 AC ATC 2 AC
(d)
Select ATC transponder 1 or 2 as desired using function selector switch on control module.
(e)
Set the function selector to STBY and wait 1 minute or longer.
(f)
Set the function selector to A or B as desired.
NOTE: The function selector may be turned directly from OFF
____ through STBY to A or B, however, in this case there is an automatic built-in warm-up delay of 60 seconds before final power is applied to the output stage.
(2) Shutdown
(a) Set the function selector on the ATC control module to OFF.
EFFECTIVITY
AF 101-151 with AEB 34-587 CONFIG and AEB 34-607 01 Page 7 Apr 25/96
34-53-00
+DC VOLTAGE
CADC 2 ATC NO. 2 TRANSPONDER
Altitude Data Switching Simplified Schematic
Figure 4
EFFECTIVITY
CONFIG 2
704 Page 8
AF 101-151
34-53-00
Jan 25/77
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. On IB 401, 402 and 405, ATC 1 transponder receives +28-volt dc power from the essential radio bus via the ATC 1 DC circuit breaker. (See figure 2.) The operating power for ATC 2 transponder is derived from radio bus No. 2 via the ATC 2 DC circuit breaker. On IB 406 and on, the standby bus and radio bus No. 2 provide 115 volts ac to the ATC system through the ATC 1 and 2 circuit breakers on the overhead circuit breaker panel, P7.
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. The position of the function selector switch determines the operational
XA status (standby, or on in mode A or B) of the ATC transponder selected by the ATC transfer switch. The ATC switch also determines whether CADC 1 or 2 supplies altitude data to ATC system 1 or 2 respectively.
C. The control module also houses identification coding switches, a test XA button, an identification button, an altitude report switch, a fault XA light and a reply light.
3. ATC Transponder
_______________
A. On IB 401, 402 and 405, the ATC transponders, located on shelf E3-6 in the main equipment center are housed in a standard 3/8 ATR short case. Electrical connections are
XA made to the unit through two connectors on the rear of the case. XA
B. On IB 406 and on, the ATC transponders, located on shelf E3-6 in the main equipment center are housed in standard 3/8 ATR short cases. All electrical connections to the unit are made through a connector located on the lower portion of the rear panel. An auxiliary connector located on the upper portion of the rear panel is provided for automatic test equipment.
EFFECTIVITY
IB ALL CONFIG 3 01 Page 1 Dec 25/8734-53-00
SEE A
...............................................XA
ATC ANTENNA NO. 1
ATC ANTENNA NO. 2
ATC TRANSPONDERS
FUNCTION SELECTOR SWITCHES CODING SELECT IDENTIFICATION FAULT LIGHT
STBY A B 0000 a FAULT g REPLY REPLY LIGHT TEST BUTTON
1 ATC 2 IDENT OFF ALT RPTG TEST SWITCH REPORT ALTITUDE
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