Localizer Antenna Installation
Figure 401

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 ALL  ú ú 01 Page 404 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 NAVIGATION UNIT - REMOVAL/INSTALLATION
______________________________________
 1.  General
_______
 A.  This subject has two tasks. The first task is the removal of the navigation unit. The second task is the installation of the navigation unit and a test of the navigation unit.
 TASK 34-31-41-004-033
 2.  Navigation Unit Removal
_______________________
 A.  General
 (1)  The navigation units are installed in the electronics equipment rack. The No. 1 navigation unit (M154) and the No. 2 navigation unit (M155) are on shelf 4 of the E3 rack.
 B.  References
 (1)  AMM 20-10-07/201, E/E Rack-Mounted Components
 C.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 D.  Procedure
 S 864-062
 (1)  For the No. 1 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) VOR/LOC-1
 2) GS-1
 3) INSTR XFMR-1

 S 864-063
 (2)  For the No. 2 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right
 1) VOR/LOC-2
 2) GS-2
 3) INSTR XFMR-2

 S 024-036
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ NAVIGATION UNIT. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE NAVIGATION UNIT.
 (3)  Do this task to remove the applicable navigation unit: Remove the Rack-Mounted E/E Box (Ref 20-10-07/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-038
 (4)  Install dust caps on the electrical connectors.
 TASK 34-31-41-404-039
 3. Navigation Unit Installation
____________________________
 A. General
 (1)  The navigation units are installed in the electronics equipment rack. The No. 1 navigation unit (M154) and the No. 2 navigation unit (M155) are on shelf 4 of the E3 rack.
 B. References
 (1)  
AMM 20-10-07/201, E/E Rack-Mounted Components

 (2)  
AMM 23-51-00/501, Flight Interphone System

 (3)  
AMM 24-22-00/201, Manual Control

 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 D. Procedure
 S 864-065
 (1)  For the No. 1 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) VOR/LOC-1
 2) GS-1
 3) INSTR XFMR-1

 S 864-066
 (2)  For the No. 2 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right
 1) VOR/LOC-2
 2) GS-2
 3) INSTR XFMR-2

 S 434-043
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ NAVIGATION UNIT. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE NAVIGATION UNIT.
 (3)  Remove the dust caps from the electrical connectors.
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