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 Receive Antennas:  Left Antenna Sta 933, WL 80, LBL 14 Center Antenna Sta 933, WL 80, BL 0 Right Antenna Sta 933, WL 80, RBL 14
 D.  A procedure to control corrosion on the antenna and fuselage fairing surface is given at the end of this procedure.
 TASK 34-33-03-024-065
 2.  Radio Altimeter Antenna Removal (Fig. 401)_______________________________
 A.  General
 (1)  The removal procedure for all the antennas is the same.
 B.  Equipment
 (1)  Sealant removal tool (hardwood or plastic)
 C.  Access
 (1)  Location Zone
 129 Keel Beam
 D.  Procedure
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B3 LEFT RADIO ALTM
 2) 7B4 CENTER RAD ALTM
 3) 7C21 RIGHT RAD ALTIM

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

(4 LOCATIONS)WIDER AND THE O-RING IS NOT
USED. SEE SHEET 2. RADIO ALTIMETER ANTENNA

3 SEE SHEET 2 FOR (SIDE VIEW) CORROSION PROTECTION
Radio Altimeter Antenna Installation Figure 401 (Sheet 1)
A79941
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

CORROSION PREVENTIVE COMPOUND, BMS 3-27 O-RINGGREASE ANDBMS 3-24 GROOVE
2
ANTENNA
RADIO ALTIMETER ANTENNA (TOP VIEW)
LARGE 
THRU 
HOLE 
ONE LAYER CORROSION  2  SMALL THRU HOLE  TWO LAYERS, BMS 10-79, PRIMER - TYPE III 
PREVENTIVE COMPOUND, BMS 3-27  FAIRING  2  ONE LAYER  CORROSION PROTECTION 
ALODINE  LAYERS ON THE 
THE FAIRING 
METAL SURFACE 

GREASE BMS 3-24 O-RING AND BEVELEDANTENNA GROOVE EDGE
AERODYNAMIC 2CADMIUM PLATEDSEALANT, BMS 5-95 STAINLESS STEEL MOUNTING SCREW (4 LOCATIONS)
CORROSION PROTECTION FOR ANTENNA/FAIRING FAYING SURFACE
NOTE: NOT TO SCALE.
Radio Altimeter Antenna Installation Figure 401 (Sheet 2)
A79942
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747-400 MAINTENANCE MANUAL
 S 024-031
 (2)  Remove the radio altimeter antenna:
 (a)  
Remove the four screws that attach the antenna to the fuselage fairing.

 CAUTION:_______BE CAREFUL WHEN YOU USE THE SEALANT REMOVAL TOOL. TOO MUCH FORCE ON THE TOOL CAN CAUSE DAMAGE TO THE METAL FLAME-SPRAY SURFACE ON THE FAIRING.

 (b)  
Put the sealant removal tool between the antenna and the fairing surface.

 (c)  
Push the sealant removal tool around the antenna until you loosen the antenna from the fairing.

 CAUTION: YOU CAN DAMAGE THE COAXIAL CABLE CONNECTED TO THE ANTENNA
_______ IF YOU USE TOO MUCH FORCE TO RELEASE THE ANTENNA FROM THE FAIRING.
 (d)  
Carefully lower the antenna until you see the coaxial cable attached to the antenna.

 (e)  
Disconnect the coaxial cable from the antenna.

 NOTE: If you remove more than one antenna, identify the
____ antenna cables with tags.
 (f)  
Remove the antenna.

 (g)  
Remove the O-ring (if installed) between the antenna and the fairing.

 TASK 34-33-03-404-010
 3. Radio Altimeter Antenna Installation (Fig. 401)
____________________________________
 A. General
 (1)  
This procedure installs the antenna and includes a test of the bond resistance between the antenna and the fairing.
　
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