Weather Radar Waveguide Installation
Figure 401 (Sheet 1)

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 AIRPLANES WITH SPERRY (RCA) PRIMUS 90  ú 34-41-21
 WEATHER RADAR SYSTEM  ú ú 01 Page 403 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) Remove the four screws that attach section 3 to the waveguide switch. 3) Remove section 3 with its gaskets.
 S 034-018
 (7)  Put dust caps on the ends of the waveguide sections.
 TASK 34-41-21-424-029
 3.  Waveguide Installation______________________
 A. General
 (1)  
When you install a waveguide section, make sure the choke flange end is always connected with the cover flange end of the opposite section. If you do not do this, an increase in VSWR can occur.

 (2)  
The clear plastic window in the Collins antenna waveguide is to keep dirt, moisture, or other contaminents from entering the waveguide. It is not mandatory to replace the clear plastic window if it has been removed, however it is recommended.

 (3)  
The o-ring gasket that are in the round waveguide flange at the ends of the antenna waveguide is to keep the antenna clean and free of moisture. The o-rings are not for pressurization or RF performance.

 B. References
 (1)  
34-41-00/501, Weather Radar System

 (2)  
34-41-02/501, Weather Radar System

 C. Access
 (1)  
Location Zone
 101 Nose Radome
 102 Lower Nose Compartment

 (2)  
Access Zone
 1103 Forward Access Door
 1201 Electronic Equipment Access Door

 D. Procedure
 S 434-030
 (1)  
Remove the dust caps from the waveguide sections.

 (2)  
Examine the waveguide sections for damage or moisture.

 (3)  
Examine all of the gaskets.

 S 214-031
 S 214-032
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 34-41-21

 ALL  ú ú 06 Page 404 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

ANTENNA

SUPPORT ANTENNA CLAMP FLEXIBLE) (RIGID AND SECTION 1 WAVEGUIDE BRACKET SUPPORT  WAVEGUIDE FLANGE GASKET (1) LOCKWASHERS (4) SCREWS (4) TRANSMITTER RECEIVER-DISCONNECT GASKET (1) WAVEGUIDE QUICK 
WAVEGUIDE FLANGE LOCKWASHERS (4) SCREWS (4) GASKET (1)  R/T MOUNT TRAY 
FWD  (RIGID) SECTION 2 WAVEGUIDE  PRESSURE (STA 178) BULKHEAD FORWARD 
SEE  A 
GASKET (1) FLANGE PRESSURE SEAL SCREWS (8) 

SECTION 2 WAVEGUIDE 
HOLE DRAIN 
SECTION 1 WAVEGUIDE 
A 
Figure 401 (Sheet 2) Weather Radar Waveguide Installation 

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 34-41-21

 RADAR SYSTEM  ú
 ú 05 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 405Jul 15/95 

A 737-300/400/500MAINTENANCE MANUAL
 (4)  S 214-033Examine the pressure seal on section 1 for damage. (a) Replace a waveguide section, gasket or pressure seal if it shows damage.
 (5)  S 864-054AIRPLANES WITH SPERRY PRIMUS 90 WEATHER RADAR SYSTEMS; Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P6 Load Control Center - Right 1) WEATHER RADAR AC 2) WEATHER RADAR DC
 (6)  S 864-061AIRPLANES WITH COLLINS WXR-700X WEATHER RADAR SYSTEMS; Open this circuit breaker and attach a DO-NOT-CLOSE tag: (a) P6 Load Control Center - Right 1) WEATHER RADAR R/T
 (7)  S 014-065Open the nose radome to get access to the WXR antenna: (a) Remove the screws from the nose radome. (b) Use a suction cup to open the radome. (c) Lock the radome in its open position.
 (8)  S 014-066Open the forward access door (1103) to get access to the waveguide sections forward of the receiver-transmitter (R/T).
　
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