(2)  
On ATC control module, place altitude reporting switch to OFF, place mode switch to A and select ATC code 3333. Place mode switch on the test set to Mode B.

(3)  
Allow 2 minutes for system to warm up. Check that REPLY light on control panel is off.

(4)  
On ATC control module, press TEST button and verify that REPLY light comes on.

(5)  
Release TEST button. Place mode switch on test set to A/C CODE. Check that test set display indicates 3333.

(6)  
If no longer required, remove electrical power from airplane.

562 
34-53-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/80 

ATC TRANSPONDER - REMOVAL/INSTALLATION
1. General
A.  The ATC transponder is installed in the main equipment center on shelf E2-1. The unit is shock mounted and held in place by two hold down hooks. Some transponders require an adapter to fit into the existing mount. The transponder and adapter should be removed or installed as one unit.
2.  Remove ATC Transponder
A.  Open ATC 1 and 2 circuit breakers on panel P18.
B.  Disconnect cable connectors on front of transponder (if required).
C.  Loosen hold-down fasteners at front of unit, and pull out transponder.
D.  On airplanes with ATC transponder adapters installed,
(1)  
Remove antenna and suppressor cables from adapter.

(2)  
Remove shock mount hold-down clamps.

(3)  
Carefully pull unit from shock mount.

3.  Install ATC Transponder
A.  Slide transponder into rack and secure.
B.  On airplanes requiring ATC transponder adapters.
(1)  
Ensure transponder is securely fastened into adapter.

(2)  
Slide unit into shock mount.

(3)  
Fasten shock mount hold-down clamps.

(4)  
Connect antenna and suppressor cables.

C.  Close circuit breakers opened in step 2.A. above.
D.  Test transponder
(1)  
Provide electrical power.

(2)  
Select STBY on ATC control module. Allow 1 minute warm up.

(3)  
On ATC control module, select installed transponder. Set up and operate appropriate ATC system in mode A.

(4)  
On installed transponder, depress TEST button. Verify REPLY light comes on.

(5)  
Release TEST button.

(6)  
Perform altitude-reporting test (if required) in par. 3, 4, or 5 of ATC System Adjustment/Test (Ref 34-53-0).

(7)  
On ATC control module position function selector to STBY or OFF as appropriate.

(8)  
Remove electrical power if no longer required.

501 
Jun 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-53-21 Page 401 

AIR TRAFFIC CONTROL (ATC) CONTROL PANEL - REMOVAL/INSTALLATION
1. General
A.  This subject has two tasks. The first task is the removal of the ATC control panel. The second task is the installation of the ATC control panel
B.  The ATC control panel is installed in the forward electronics panel, P9.
C.  Electrical connections are made through multipin connectors on the rear of the control panel.
2.  ATC Control Panel Removal
A.  Procedure
(1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

(a)  
P6 Circuit Breaker Panel
1) ATC 2

(b)  
P18 Circuit Breaker Panel
1) ATC1

(2)  
Do these steps to remove the ATC control panel:

(a)  
Loosen the quarter-turn fasteners on the control panel.

CAUTION:  DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE ATC CONTROL PANEL.IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE TO THE ATC CONTROL PANEL.

(b)
Pull the control panel out until you can get to the electrical connectors.

(c)  
Disconnect the electrical connectors from the control panel.

(d)  
Remove the control panel.

(e)  
Install dust caps on the electrical connectors.

5C8 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-53-31 Page 401 

3.  ATC Control Panel Installation
A.  References
(1)  24-22-0/201, Electrical Power-Control
B.  Procedure
(1)  
Make sure these circuit breakers are opened:

(a)  
P6 Circuit Breaker Panel
1) ATC 2

(b)  
　
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