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 B.  PASSENGER AIRPLANES; The left R/T (B138) and the right R/T (B140) are on the E30 electronic equipment rack. The E30 rack is in the right crawlway forward of the main equipment center.
 C.  FREIGHTER AIRPLANES; The left R/T (B138) is located on the E5-1 weather radar shelf below the floor compartment between stations 180 and 200. The right R/T (B140) is located on the E5-2 weather radar shelf below the floor compartment betweeen stations 200 and 220.
 D.  The removal task and the installation task are the same for the left and the right R/T.
 TASK 34-43-02-004-001
 2.  Receiver/Transmitter Removal____________________________
 A.  References
 (1)  
06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
20-11-22/401, Rack-Mounted Electrical/Electronic Modules

 B.  Access
 (1)  
PASSENGER AIRPLANES;

 Location Zones 116 Area Between Nose Gear Well and Fuselage, RH

 (2)  
FREIGHTER AIRPLANES;

 Location Zones 112 Freighter Main Deck-Nose to First Door, Left

 (3)  
PASSENGER AIRPLANES;

 Access Panels 117A Electronic Compartment Access Door
 C.  Procedure
 S 864-002
 (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

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747-400 MAINTENANCE MANUAL
 S 014-107
 (2)  
PASSENGER AIRPLANES; Open the access door to the 117AL electronics compartment to get to the R/Ts (AMM 06-09-01/201).

 S 014-115

 (3)  
FREIGHTER AIRPLANES; Get access to the receiver/transmitter 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 WHEN STEPPED UPON AND CAN 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 panel.
 S 024-108
 (4)  PASSENGER AIRPLANES; Do this task to remove the R/T from the R/T mount: Rack Mounted Electrical/Electronic Module - Removal (AMM 20-11-22/401).
 CAUTION:_______HOLD THE R/T AWAY FROM THE LOWER E30 SHELF. IF THE R/T TOUCHES THE UNITS INSTALLED IN THE LOWER E30 SHELF, THE R/T COULD DAMAGE THIS EQUIPMENT.
 (a)  
Make sure the removed R/T does not touch any of the electrical equipment on the lower E30 shelf.

 (b)  
Put a dust cap on the electrical connector/waveguide flange on the left R/T mount (DB138) or the right R/T mount (DB140).

 (c)  
Put a dust cap on the electrical connector/waveguide flange on the left R/T (DB138) or the right R/T (DB140).

 S 024-109
 (5)  FREIGHTER AIRPLANES; Remove the receiver/transmitter from the left or the right R/T mount below the floor compartment between stations 180 and 220.
 (a)  
Loosen and disengage the R/T holddown knobs.

 (b)  
Remove the left R/T from the left R/T mount.

 (c)  
Remove the right R/T from the right R/T mount.

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747-400
MAINTENANCE MANUAL

 (d)  
Put a dust cap on the electrical connector/waveguide flange on the left R/T mount (DB138) or the right R/T mount (DB140).

 (e)  
Put a dust cap on the electrical connector/waveguide flange on the left R/T (DB138) or the right R/T (DB140).
　
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