34-28-91

 INDICATOR  ú
 ú 01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 403Nov 15/96 

A
737-300/400/500MAINTENANCE MANUAL
 IRS TRANSFER RELAY - REMOVAL/INSTALLATION
_________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is for the removal of an Inertial Reference System (IRS) transfer relay. The second task is for the installation of an IRS transfer relay.
 B.  The two relays are installed on the E1-2 shelf in the main equipment center. IRS transfer relay #2, R378, is installed above IRS transfer relay #1, R377.
 C.  IRS transfer relay #1 is the same as IRS transfer relay #2.
 TASK 34-28-92-004-049
 2.  IRS Transfer Relay Removal
__________________________
 A.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 B.  Procedure
 S 864-002
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P18 Circuit Breaker Panel
 1) INSTRUMENT TRANSFER

 S 034-012
 (2)  
Remove the screws from the face of the relay.

 S 024-013

 (3)  
Remove the relay from the rack.

 TASK 34-28-92-404-050
 3.  IRS Transfer Relay Installation
_______________________________
 A.  References
 (1)  AMM 24-22-00/201, Manual Control
 B.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

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 ALL  ú ú 01 Page 401 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

SEE A
E-1 RACK

E-3 RACK

IRS Transfer Relay Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Procedure
 S 864-006
 (1)  Make sure that this circuit breaker is open:
 (a)  P18 Circuit Breaker Panel
 1) INSTRUMENT TRANSFER

 S 424-014
 (2)  
Connect the relay to the rack.

 S 434-015

 (3)  
Install the screws into the face of the relay.

 S 864-008

 (4)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P18 Circuit Breaker Panel
 1) INSTRUMENT TRANSFER

 D. IRS Transfer Relay Test
 S 864-016
 (1)  AIRPLANES WITHOUT EFIS;
 make sure that these circuit breakers are closed:

 (a)  
P6 Circuit Breaker Panel
 1) ADI
 2) CAPT ADI (ALTN)
 3) CAPT COMPASS XFMR (ALTN) AC
 4) DAA NO. 2 FMC
 5) DAA NO. 2 FMC AC
 6) DAA NO. 2 IRS AC
 7) DAA NO. 2 IRS DC
 8) DIM AND TEST
 9) INSTR XFMR-2
 10) IRS NO. 1 AC
 11) IRS NO. 1 DC
 12) MASTER DIM BUS BAT
 13) MASTER DIM BUS NO. 1 DC
 14) MASTER DIM BUS NO. 2 DC
 15) MASTER DIM BUS SECT 2
 16) VERT SPEED IND

 (b)  
P18 Circuit Breaker Panel
 1) ADI
 2) DAA NO. 1 FMC
 3) DAA NO. 1 FMC AC

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