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 B.  There are two EFIS transfer relays installed on the E1-2 shelf in the main equipment center. You can find the relays behind the flight management computer.
 TASK 34-22-51-004-001
 2.  EFIS Transfer Relay Removal
___________________________
 A.  References
 (1)  AMM 34-62-21/401, Flight Management Computer
 B.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201 Electronic Equipment Access Door

 

 C.  Procedure
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6 Circuit Breaker Panel
 1) EFIS SYM GEN R

 (b)  
P18 Circuit Breaker Panel
 1) EFIS SYM GEN L
 2) INST TRANS

 

 S 014-004
 (2)  Do this task: Flight Management Computer Removal
 (AMM 34-62-21/401).

 NOTE: The EFIS transfer relay is behind the flight management
____
 computer on the E1-2 shelf.

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 34-22-51
 ú ú 01 Page 401 ú Jul 15/95

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 014-020
 (3)  
Remove the connector from the vertical bracket behind the flight management computer.

 S 014-021

 (4)  
Get access to the EFIS transfer relay through the rectangular hole in the vertical bracket behind the flight management computer.

 S 024-005

 (5)  
Remove the EFIS transfer relay:

 (a)  
Disconnect the electrical connector from the applicable EFIS transfer relay.

 (b)  
Remove the screws from the bracket.

 (c)  
Remove the EFIS transfer relay.

 

 TASK 34-22-51-404-006
 3. EFIS Transfer Relay Installation
________________________________
 A. References
 (1)  
AMM 21-58-02/501, EFIS Cooling System

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 34-62-21/401, Flight Management Computer

 B. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201 Electronic Equipment Access Door

 

 C. Procedure
 S 864-007
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6 Circuit Breaker Panel
 1) EFIS SYM GEN R

 (b)  
P18 Circuit Breaker Panel
 1) EFIS SYM GEN L
 2) INST TRANS

 

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-22-51

 ú ú 03 Page 402 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 014-008
 (2)  Do this task: Flight Management Computer Removal
 (AMM 34-62-21/401).

 NOTE: You can find the bracket for the EFIS transfer relay behind
____
 the flight management computer.

 S 014-025
 (3)  
Remove the connector from the vertical bracket behind the flight management computer.

 S 014-026

 (4)
Get access to the EFIS transfer relay through the rectangular hole in the vertical bracket behind the flight management computer.

 S 424-009

 (5)  
Install the EFIS transfer relay:

 (a)  
Put the EFIS transfer relay in the applicable bracket.

 (b)  
Install the screws.

 (c)  
Connect the applicable electrical connector to the EFIS transfer relay.

 

 D. Prepare for the EFIS Transfer Relay Test
 S 864-030
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-031

 (2)  
Make sure the BAT switch on the pilots' forward overhead panel is in the ON position.
　
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