(b)  
Remove the eight screws and lockwashers that attach the planar array to the ring mount.

 WARNING: DURING A PLANAR ARRAY REMOVAL, USE TWO PERSONS AND A
_______ SAFELY INSTALLED WORKSTAND. THE ANTENNA ARRAY WEIGHS APPROXIMATELY 7 POUNDS.
 BE CAREFUL WITH THE PLANAR ARRAY DURING THE REMOVAL. CAREFULLY REMOVE THE PLANAR ARRAY TO PREVENT INJURY TO YOU OR DAMAGE TO THE PLANAR ARRAY.
 (c)  Carefully remove the planar array.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-43-03
 ALL  ú ú 09 Page 405 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 034-069
 (4)  Put dust caps on the waveguide flanges.
 TASK 34-43-03-004-017
 4.  Weather Radar Antenna Drive Assembly Removal (Fig. 401 and 402)____________________________________________
 A. References
 (1)  
AMM 34-43-03/401, Weather Radar Antenna Array

 (2)  
AMM 53-52-01/201, Nose Radome

 (3)  
AIPC 34-43-03 Fig. 1

 B. Access
 (1)  Location Zone
 111 Radome

 C. Procedure
 S 864-042
 (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
 S 014-072
 (2)  
Open the nose radome (AMM 53-52-01/201).

 (3)  
Remove the planar array (AMM 34-43-03/401)

 S 024-044

 (4)  
Remove the antenna drive assembly:

 S 034-072
 (a)  Disconnect the electrical connector DB143A from the antenna connector J1.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-43-03
 ALL  ú ú 04 Page 406 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

CAUTION:PLANAR ARRAY IS COUNTERBALANCED BY A TORQUE SPRING. RESTRICT ROTOR ASSEMBLY MOVEMENT WHEN REMOVING PLANAR ARRAY FROM ROTOR ASSEMBLY.

PLANAR ARRAY
PLANAR ARRAY WAVEGUIDE FLANGE
NOTE:TIGHTEN SCREWS TO 20-23 INCH-POUNDS.
Weather Radar Antenna Array Removal/Installation
Figure 402

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-43-03
 ALL  ú ú 01 Page 407 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Disconnect the electrical connector DB143B from the antenna connector J2.

 (c)  
Remove the screws and washers from the flanges between waveguide Section 1 and the antenna drive assembly.

 CAUTION: DO NOT LOOSEN THE BOLTS ON THE SUPPORT ASSEMBLY OR THE
_______ MOUNT ASSEMBLY DURING THE REMOVAL OF THE ANTENNA DRIVE ASSEMBLY. THESE ARE ALIGNED AT THE FACTORY. IF THE MOUNT IS LOOSE OR NOT ALIGNED, HAVE A BOEING AOG TEAM DO A SPECIAL PROCEDURE. TELL THE BOEING SEATTLE AOG OFFICE.
 (d)  
Remove the two bottom mount bolts and washers on the antenna.

 (e)  
Loosen the two top mount bolts on the antenna.

 WARNING: USE TWO PERSONS AND A SAFELY INSTALLED WORKSTAND DURING
_______ THE REMOVAL OF THE ANTENNA DRIVE ASSEMBLY . THE ANTENNA DRIVE ASSEMBLY WEIGHS APPROXIMATELY 18 POUNDS.
 BE CAREFUL WITH THE ANTENNA DRIVE ASSEMBLY DURING THE REMOVAL. CAREFULLY REMOVE THE ANTENNA DRIVE ASSEMBLY TO PREVENT INJURY TO YOU OR CAUSE DAMAGE TO THE ANTENNA DRIVE ASSEMBLY.
 (f)  Lift the antenna up and forward of the two top mount bolts on the antenna.
 S 034-073
 (5)  
Put dust caps on the antenna electrical connectors and waveguide flange.

 S 214-081

 (6)  
Ensure there are no cracks or damage to the mount assembly or support assembly.

 TASK 34-43-03-404-006
 5.  Weather Radar Antenna Installation (Fig. 401)__________________________________
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 導航 NAVIGATION 2(132)