747-400
MAINTENANCE MANUAL

MAIN EQUIPMENT CENTER
ELECTRICAL EQUIPMENT RACK E-2
ATC ANTENNA
RF TRANSFER
RELAYS (E2-3)

SEE A
FWD
RIGHT AIR  BOTTOM ATC ANTENNA
DATA COMPUTER  RF TRANSFER RELAY
SEE B

B871 FWD
B872
TOP ATC ANTENNA
RF TRANSFER RELAY
LEFT ATC
TRANSPONDER SEE B

ATC ANTENNA RF TRANSFER
RELAY MOUNTED (E2-3 RACK)

A
ATC ANTENNA RF TRANSFER
RELAY INSTALLATION

B

ATC Antenna RF Transfer Relays Location/Installation
Figure 401

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747-400
MAINTENANCE MANUAL

 TASK 34-53-04-424-006
 3. Antenna Transfer Relay Installation (Fig. 401)
___________________________________
 A. References
 (1)  
34-12-01/401, Air Data Computer

 (2)  
34-53-00/501, ATC System - Adjustment/Test

 (3)  
34-53-02/401, ATC Transponder

 (4)  
IPC 34-53-04-01 Fig. 1

 B. Access
 (1)  Location Zone 117/118 Electrical and Electronics Compartment
 C. Procedure
 S 864-007
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R
 3) 7B23 NAV RADIO ATC ANTENNA SW

 S 424-008
 (2)  Install the antenna transfer relay (Fig 401):
 NOTE: Make sure the two ATC antenna switches have the same mod
____
 level of the same part number.

 (a)  
Connect connectors DB871A, DB871B, DB871C and DB871D to the bottom antenna transfer relay (B871).

 (b)  
Connect connectors DB872A, DB872B, DB872C, and DB872D to the top antenna transfer relay (B872).

 NOTE: Align the antenna transfer relay until the electrical
____ connector is on top.
 (c)  Install the screws, washers and nuts that attach the relay to the support bracket.
 S 414-009
 (3)  
If it is removed, do this task to install the right Air Data Computer: "Air Data Computer Installation" (Ref 34-12-01/401).

 S 414-010

 (4)  
If it is removed, do this task to install the left ATC Transponder: "ATC Transponder Installation" (Ref 34-53-02/401).

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747-400 MAINTENANCE MANUAL
 D. Prepare for the ATC Antenna Relay Switch Test
 S 864-012
 (1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R
 3) 7B23 NAV RADIO ATC ANTENNA SW

 S 864-057
 (2)  Set the transponder select switch on the ATC control panel to the applicable system (1 or L, 2 or R).
 (a)  Make sure the sequence that follows occurs: 1) All of the front panel LED indicators come on. 2) All of the LED indicators go off. 3) The green XPDR PASS indicator comes on.
 S 744-033
 (3)  
If the applicable system antenna indicator is on, do the fault isolation procedure (FIM 34-53-00/101, Fig. 103).

 (4)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 S 864-024
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