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 34-43-07
 ALL  ú ú 04B Page 413 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WEATHER RADAR R/T MOUNT FILTER - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
 A.  This subject has two tasks. The first task is for the removal of the weather radar (WXR) R/T mount filters. The second task is for the installation of the R/T mount filters. The removal task for the R/T mount filter has these parts:
 (1)  
Remove the right WXR receiver/transmitter

 (2)  
Remove the left WXR receiver/transmitter

 (3)  
Remove the R/T mount filter(s).

 B.  The installation task for the R/T mount filter has these parts:
 (1)  
Install the R/T mount filter(s)

 (2)  
Install the left WXR receiver/transmitter

 (3)  
Install the right WXR receiver/transmitter

 (4)  
Do a test on the weather radar system.

 C.  The filters are part of the dual R/T mount attached to the E30 electronic equipment rack. The R/T mount and E30 rack is in the right crawlway forward of the main equipment center.
 TASK 34-43-08-004-001
 2.  R/T Mount Filter Removal (Fig. 401)________________________
 A.  References
 (1)  
AMM 06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
AMM 34-43-02/401, Weather Radar Receiver/Transmitter

 B.  Access
 (1)  
Location Zones 116 Area Between the Nose Gear Well and the Fuselage, RH

 (2)  
Access Panels
 117AL Electronics Compartment Access Door

 C.  Procedure
 S 864-011
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7 WXR L RT
 2) 7C19 WXR R RT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-43-08
 ALL  ú ú 08 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-023
 (2)  
Open the access door to the 117AL electronics compartment to get to the R/T mount filters (AMM 06-09-01/201).

 S 014-003

 (3)  
Do this task to remove the left WXR receiver/transmitter from the E30 equipment rack: "Weather Radar Receiver/Transmitter Removal" (AMM 34-43-02/401).

 S 014-034

 (4)  
Do this task to remove the right WXR receiver/transmitter from the E30 equipment rack: "Weather Radar Receiver/Transmitter Removal" (AMM 34-43-02/401).

 S 024-004

 (5)  
Do these steps to remove each of the R/T mount filters:

 (a)  
Remove the two knobs and four washers from the filter enclosure.

 (b)  
Remove the filter cover.

 (c)  
Remove the filter assembly.

 (d)  
Remove the filter from the filter bracket.

 TASK 34-43-08-404-005
 3.  R/T Mount Filter Installation (Fig. 401)_____________________________
 A. References
 (1)  
AMM 06-09-01/201, Body Section 41 Access and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 34-43-00/501, Weather Radar System

 (4)  
AMM 34-43-02/401, Weather Radar Receiver/Transmitter

 B. Access
 (1)  
Location Zone 116 Area Between the Nose Gear Well and the Fuselage, RH

 (2)  
Access Panels
 117AL Electronics Compartment Access Door

 C. Procedure
 S 864-012
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
　
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