(2)  
IPC 34-53-01-02 Fig. 2

 B. Access
 (1)  Location Zone
 221 Control Cabin, LH

 C. Procedure
 S 864-007
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  
P6 Main Power Distribution Panel 1) 6F19 FLT DECK LIGHTS PILOTS MISC IND 1 2) 6E22 FLT DECK LIGHTS PANEL CONT STAND

 (b)  
P7 Overhead Circuit Breaker Panel 1) 7B10 NAV RADIO ATC L 2) 7B22 NAV RADIO ATC R

 S 434-037
 (2)  
Remove the dust caps from the electrical connectors on the ATC control panel.

 S 434-033

 (3)  
Connect electrical connectors DB37A and DB37B to the ATC control panel.

 (4)  
Install the control panel into the instrument panel.

 S 424-034
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747-400 MAINTENANCE MANUAL
 S 434-035
 (5)  
Tighten the fasteners that hold the control panel in place.

 S 864-011

 (6)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel
 1) 6F19 FLT DECK LIGHTS PILOTS MISC IND 1
 2) 6E22 FLT DECK LIGHTS PANEL CONT STAND

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R

 S 864-012
 (7)  
Supply electrical power (Ref 24-22-00/201).

 S 864-038

 (8)  
Set the transponder select switch on the ATC control panel to the applicable system (L or 1, R or 2).

 D. ATC Control Panel Test
 S 744-048
 (1)  
Push and release the TEST switch on the front panel of the applicable transponder.

 (a)  Make sure the sequence that follows occurs: 1) All of the front panel LED indicators come on. 2) All of the front panel LED indicators go off. 3) The green XPDR PASS indicator comes on.

 (2)  
Make sure the panel lights on the ATC control panel are on.

 (3)  
Set the transponder select switch to the other position.

 (4)  
Do the ATC control panel test again.

 (5)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 S 714-018
 S 864-062
 S 744-059
 S 864-023
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747-400 MAINTENANCE MANUAL
 AIR TRAFFIC CONTROL (ATC) TRANSPONDER - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is the removal of the ATC transponder. The second task is the installation of the ATC transponder.
 B.  The two ATC transponders are installed in the main equipment center. The left, B99, ATC transponder is installed on the E2 rack on shelf No. 3. The right, B100, ATC transponder is installed on the E2 rack on shelf No. 2.
 TASK 34-53-02-004-001
 2.  ATC Transponder Removal_______________________
 A.  References
 (1)  
AMM 06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 B.  Access
 (1)  
Location Zones
 117/118 Electrical and Main Equipment Center

 (2)  
Access Panels
 117AL Electronics Compartment Access Door

 C.  Prepare for Removal
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
　
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