WARNING: USE TWO PERSONS AND A SAFELY INSTALLED WORKSTAND DURING
_______ THE INSTALLATION OF THE PLANAR ARRAY. THE PLANAR ARRAY WEIGHS APPROXIMATELY 7 POUNDS.
 BE CAREFUL WITH THE PLANAR ARRAY DURING INSTALLATION. CAREFULLY INSTALL THE PLANAR ARRAY TO PREVENT INJURY TO YOU OR DAMAGE TO THE PLANAR ARRAY.
 (a)  
Put the planar array on the ring mount.

 (b)  
Install eight screws and lockwashers on the ring mount.

 (c)  
Tighten the screws between 20 and 23 pounds-inches.

 (d)  
Align the flexible waveguide flange on the rotary joint with the planar array waveguide flange.

 (e)  
Carefully install four screws and lockwashers. 1) Tighten the four screws by hand to make sure the screws are

 not cross-threaded. 2) Tighten the four screws between 20 and 23 pounds-inches.

 (f)  
Make sure the electrical connector DB143A is correctly connected to the antenna connector J1.

 (g)  
Make sure the electrical connector DB143B is correctly connected to the antenna connector J2.

 S 864-096
 (4)  Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7, WXR L RT
 2) 7C19, WXR R RT

 S 734-053
 (5)  
Do the ND display test in the system test (AMM 34-43-00/501).

 S 734-062

 (6)  
Operate the weather radar for 10 minutes after the planar array has been installed.

 NOTE: This step and a second torque step below is necessary,
____ especially on new antenna arrays, to make sure the four screws are correctly installed.
 S 864-063
 (7)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7, WXR L RT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 2) 7C19, WXR R RT
 S 034-064
 (8)  
Tighten the four screws on the waveguide flanges between 20 and 23 pound-inches.

 S 864-065

 (9)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7, WXR L RT
 2) 7C19, WXR R RT

 S 864-098
 (10)
 If electrical power is not necessary, Do this task to remove electrical power: "Manual Control" (AMM 24-22-00/201).

 S 414-075

 (11)
 Do this task to close the nose radome:  "Nose Radome" (AMM 53-52-01/201).

 TASK 34-43-03-404-034
 7.  Weather Radar Antenna Drive Assembly Installation (Fig. 401 and 402)._________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 34-43-00/501, Weather Radar System

 (3)  
AMM 53-52-01/201, Nose Radome

 (4)  
AIPC 34-43-03 Fig. 1

 B. Access
 (1)  Location Zone
 111 Radome

 C. Procedure
 S 864-085
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7, WXR L RT
 2) 7C19, WXR R RT

 S 434-079
 (2)  Remove dust caps from the waveguide flanges on the antenna drive assembly and the planar array.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 747-400 MAINTENANCE MANUAL
 (3)  S 424-055Install the antenna drive assembly:
 WARNING:_______ USE TWO PERSONS AND A SAFELY INSTALLED WORKSTAND DURING THE INSTALLATION OF THE DRIVE ASSEMBLY. THE DRIVE ASSEMBLY WEIGHS APPROXIMATELY 18 POUNDS.
　
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