(e)  
Release the DSPL SEL switch on the ISDU.

 E. Put the Airplane Back to Its Usual Condition
 S 864-054
 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 (1)  
Turn the two switches on the MSU to the OFF position.

 (2)  
Set the IRS switch on the P5-28 panel to the NORMAL position.

 S 864-041
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A 737-300/400/500MAINTENANCE MANUAL
 (3)  S 864-043AIRPLANES WITHOUT EFIS; remove the IRU cooling if it is not necessary (AMM 21-58-00/501).
 (4)  S 864-045AIRPLANES WITH EFIS; remove the IRU cooling if it is not necessary (AMM 21-58-03/501).
 (5)  S 864-047AIRPLANES WITH EFIS; stop the cool air to the EHSI's, EADI's and EFIS symbol generators if it is not necessary (AMM 21-58-02/501).
 (6)  S 864-011Remove electrical power if it is not necessary (AMM 24-22-00/201).

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A
737-300/400/500MAINTENANCE MANUAL
 ATTITUDE TRANSFER RELAY - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the removal of an attitude transfer relay. The second task is for the installation of an attitude transfer relay.
 B.  The two relays are installed on the E1-2 shelf in the main equipment center. Attitude transfer relay No. 2, R51, is installed above attitude transfer realy No. 1, R67 (Fig. 401).
 C.  Attitude transfer relay No. 1 is the same as attitude transfer relay No. 2.
 TASK 34-28-93-004-001
 2.  Attitude 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 these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Circuit Breaker Panel
 1) F/O ADI
 2) CAPT ADI (ALT)
 3) DAA NO. 2 FMC
 4) DAA NO. 2 FMC AC
 5) DAA NO. 2 IRS AC
 6) DAA NO. 2 IRS DC

 (b)  
P18 Circuit Breaker Panel
 1) INSTR XFER
 2) CAPT ADI
 3) F/O ADI (ALT)
 4) DAA NO. 1 FMC
 5) DAA NO. 1 FMC AC
 6) DAA NO. 1 IRS AC
 7) DAA NO. 1 IRS DC

 (2)  
Remove the screws from the face of the relay.

 (3)  
Remove the relay from the rack.

 S 034-003
 S 024-004
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A 737-300/400/500MAINTENANCE MANUAL

E3 RACK

Attitude Transfer Relay Installation
Figure 401

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A05813
A 737-300/400/500MAINTENANCE MANUAL
 TASK 34-28-93-404-005
 3. Attitude Transfer Relay Installation
　
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