34-31-72

 ú ú 04 Page 402 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 864-151
 (5)  For the ILS transfer relay No. 2: Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  P6 Load Control Center - Right
 1) VHF NAV-2 VOR/ILS

 S 714-127
 (6)  
Do the ILS Antenna Transfer Relay Test part of the VOR/ILS System Test (Ref 34-31-02/501).

 S 864-083

 (7)  
If electrical power is not necessary: Do this task to remove electrical power: Manual Control (AMM 24-22-00/201).

 TASK 34-31-72-004-152
 4. VHF NAV Transfer Relay Removal
______________________________
 A. General
 (1)  The VHF NAV transfer relays are installed on shelf 4 of the electronic equipment rack (E3).
 B. References
 (1)  34-31-42/401, Navigation Unit - Removal/Installation
 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Procedure
 S 864-085
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) INSTR XFR
 2) INSTR XFMR-1
 3) VHF NAV-1 VOR/ILS

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-31-72
 ú ú 04 Page 403 ú Nov 15/98

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  P6 Load Control Center - Right
 1) INSTR XFMR-2
 2) VHF NAV-2 VOR/ILS

 S 014-088
 (2)  
Do this task to remove the navigation unit to get access to the transfer relay: Navigation Unit Removal (Ref 34-31-42/401).

 S 024-089

 (3)  
Remove the VHF NAV transfer relay:

 (a)  
Disconnect the coaxial cables and electrical cables from the relay.

 (b)  
Remove the screws that attach the relay to the shelf.

 (c)  
Remove the VHF NAV transfer relay from the shelf.

 TASK 34-31-72-404-153
 5.  VHF NAV Transfer Relay Installation___________________________________
 A. General
 (1)  The VHF NAV transfer relays are installed on shelf 4 of the electronic equipment rack (E3).
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
34-31-02/501, VOR/ILS Navigation System - Adjustment/Test

 (3)  
34-31-42/401, Navigation Unit - Removal/Installation

 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Procedure
 S 864-091
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR
 2) INSTR XFMR-1
 3) VHF NAV-1 VOR/ILS

 (b)  
P6 Load Control Center - Right
 1) INSTR XFMR-2
 2) VHF NAV-2 VOR/ILS

 S 424-094
 (2)  Install the VHF NAV transfer relay:
 (a)  
Align the relay to the holes in the shelf.

 (b)  
Install the screws to attach the relay to the shelf.

 (c)  
Connect the coaxial cables and electrical cables to the relay and tighten with your hand.

 S 414-095
 (3)  Do this task to install the navigation unit:
 Navigation Unit Installation (Ref 34-31-42/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-31-72

 ú ú 04 Page 404 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (4)  S 864-096Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P18 Load Control Center - Left 1) INSTR XFR 2) INSTR XFMR-1 3) VHF NAV-1 VOR/ILS (b) P6 Load Control Center - Right 1) INSTR XFMR-2 2) VHF NAV-2 VOR/ILS
　
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