S 864-027
 (1)  Open these circuit breqakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7 WXR L RT
 2) 7C19 WXR R RT

 S 014-028
 (2)  
Open the nose radome (AMM 53-52-01/201).

 S 024-029

 (3)  
Remove waveguide Section 1:

 (a)  
Remove the screws and washers from the flanges between waveguide Sections 1 and 2.

 (b)  
Release the quick disconnect that holds the waveguide Section 1 to the antenna waveguide.

 (c)  
Remove the screw, nut, and the support clamp from waveguide Section 1.

 (d)  
Remove waveguide Section 1 and gaskets.

 S 024-117
 (4)  Put dust caps on the waveguide flanges.
 D. Waveguide Section 2 Removal.
 NOTE: To remove waveguide section 2, access is necessary
____ to get into the nose radome and below the compartment floor in the nose cargo door section.
 S 864-031
 (1)  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 014-032
 (2)  
Open the nose radome (AMM 53-52-01/201).

 S 014-236

 (3)  
Get access to section 2 below the compartment floor:

 (a) Release the 18 fasteners that hold the cargo floor panel.
 WARNING: STEP ONLY ON THE FLOOR BEAMS WHEN YOU REMOVE CARGO FLOOR
_______ PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
 WARNING:_______THE CARGO FLOOR PANEL IS HEAVY. TO PREVENT INJURY, TWO PEOPLE ARE REQUIRED WHEN LIFTING OR MOVING THE CARGO FLOOR PANEL.
 CAUTION: DO NOT PUSH OR PULL THE CARGO FLOOR PANEL ACROSS THE FLOOR
_______ BEAMS. THIS ACTION CAN CAUSE DAMAGE TO THE BLANKET MATERIAL.
 (b)  Carefully remove the cargo floor panel.
 S 024-034
 (4)  Remove waveguide Section 2:
 (a)  
Remove screws and lockwashers from flanges between sections 1 and 2.

 (b)  
Remove eight screws from bulkhead flange.

 (c)  
Remove screws and lockwashers from flanges between sections 2 and 3.

 (d)  
Remove two screws, two nuts and four washers that hold the aft waveguide tab to the aft support bracket.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (e)  
Remove two screws, two nuts and four washers that holds the forward waveguide tab to the forward support bracket.

 (f)  
Support section 2 and carefully pull section 2 forward through the hole in bulkhead.

 (g)  
Remove waveguide Section 2 and gaskets.

 S 024-118
 (5)  Put dust caps on waveguide flanges.
 E. Waveguide Section 3 Removal
 NOTE: To remove waveguide Section 3, it is necessary to get into the
____ nose radome and below the compartment floor in the nose cargo door.
 S 864-036
 (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 014-238
 (2)  Get access to section 3 below the compartment floor:
 (a)  Release the 18 fasteners that hold the cargo floor panel.
 WARNING: STEP ONLY ON THE FLOOR BEAMS WHEN YOU REMOVE CARGO FLOOR
_______ PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
　
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