S 714-008
 (4)  
Do the VHF NAV Transfer Switch Test part of the VOR/ILS Operational Test (Ref 34-31-00/501).

 S 864-009

 (5)  
If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).

 TASK 34-31-81-004-010
 4.  HSI Transfer Switch Removal___________________________
 A. General
 (1)  The captain's HSI transfer switch (S776) and the first officer's HSI transfer switch (S777) are on the lightshield panel (P7).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 101, 102 Control Cabin

 C. Procedure
 S 864-011
 (1)  For the captain's HSI transfer switch, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR
 2) VOR/LOC-1

 (b)  
P6 Load Control Center - Right
 1) CAPTAINS PANEL LIGHT 28V PRIMARY

 S 864-012
 (2)  For the first officer's HSI transfer switch, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR

 (b)  
P6 Load Control Center - Right
 1) VOR/LOC-2
 2) F/O PNL LTS 28V PRIMARY

 S 024-013
 (3)  Remove the HSI transfer switch:
 (a)  
Remove the edge light panel from the switch.

 (b)  
Remove the mounting hardware from the switch.

 (c)  
Pull the switch from the panel to get access to the electrical wires on the rear of the switch.

 (d)  
Disconnect the wires from the switch terminals.

 (e)  
Identify the wires for installation.

 TASK 34-31-81-404-014
 5.  HSI Transfer Switch Installation________________________________
 A. General
 (1)  The captain's HSI transfer switch (S776) and the first officer's HSI transfer switch (S777) are on the lightshield panel (P7).
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  Location Zone
 101, 102 Control Cabin

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 D. Procedure
 S 864-015
 (1)  For the captain's HSI transfer switch, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR
 2) VOR/LOC-1

 (b)  
P6 Load Control Center - Right
 1) CAPTAINS PANEL LIGHT 28V PRIMARY

 S 864-016
 (2)  For the first officer's HSI transfer switch, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR

 (b)  
P6 Load Control Center - Right
 1) VOR/LOC-2
 2) F/O PNL LTS 28V PRIMARY

 S 424-017
 (3)  Install the HSI transfer switch:
 (a)  
Connect the electrical wires to the switch terminals.

 (b)  
Put the switch into the lightshield panel.

 (c)  
Install the mounting hardware

 (d)  
Install the edge light panel.

 S 864-018
 (4)  For the captain's HSI transfer switch, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR
 2) VOR/LOC-1

 (b)  
P6 Load Control Center - Right
 1) CAPTAINS PANEL LIGHT 28V PRIMARY
　
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