S 864-019
(5) For the first officer's HSI transfer switch, remove the DO-NOT-CLOSE tags and close these circuit breakers:
(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 864-020
(6) Do this task to supply electrical power: Manual Control
(Ref 24-22-00/201)
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A 737-300/400/500MAINTENANCE MANUAL
(7) S 714-021Set the HSI transfer switch in the VOR/ILS position. (a) Make sure a VOR/ILS annunciation shows on the HSI.
(8) S 714-022Set the HSI transfer switch in the NAV position. (a) Make sure a NAV annunciation shows on the HSI.
(9) S 864-023If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
TRANSFER SWITCHES - REMOVAL/INSTALLATION
________________________________________
1. General_______
A. This subject has two tasks:
(1)
The first task is the removal of the VHF NAV transfer switch.
(2)
The second task is the installation and test of the VHF NAV transfer switch.
TASK 34-31-82-004-001
2. VHF NAV Transfer Switch Removal_______________________________
A. General
(1)
The VHF NAV transfer switch is a part of the instrument switching module. To replace the VHF NAV transfer switch, replace the instrument switching module.
(2)
The instrument switching module is on the forward overhead panel (P5).
B. Access
(1) Location Zone
101, 102 Control Cabin
C. Procedure
S 864-002
(1) 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) OVERHEAD 28V PRIMARY
S 024-003
(2) Remove the instrument switching module:
(a)
Remove the edge light panel from the module.
(b)
Remove the screws from the module.
(c)
Pull the module from the panel to get access to electrical connectors on the rear of the module.
(d)
Disconnect the electrical connectors from the module.
TASK 34-31-82-404-012
3. VHF NAV Transfer Switch Installation____________________________________
A. General
(1)
The VHF NAV transfer switch is part of the instrument switching module. To replace the VHF NAV transfer switch, replace the instrument switching module.
(2)
The instrument switching module is on the forward overhead panel (P5).
B. References
(1)
24-22-00/201, Manual Control
(2)
34-31-02/501, VOR/ILS Navigation System
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737-300/400/500MAINTENANCE MANUAL
C. Access
(1) Location Zone
101, 102 Control Cabin
D. Procedure
S 864-013
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
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