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 1.  General
_______
 A.  There are two tasks in this subject. The first task is the removal of the distance measuring equipment (DME) antenna. The second task is for the installation of the DME antenna.
 B.  The left and right DME antennas are installed on the bottom of the fuselage on the centerline. The left DME antenna (B83) is installed at station 690. The right DME antenna (B84) is installed at station 830.
 TASK 34-55-02-004-001
 2.  DME Antenna Removal (Fig. 401)
___________________
 A.  Standard Tools and Equipment
 (1)  Sealant removal tool - hardwood or plastic
 B.  References
 (1)  AMM 51-31-01/201, Seals and Sealing
 C.  Access
 (1)  Location Zone
 129 Keel Beam
 139 Keel Beam

 D.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach D0-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B8 NAV RADIO DME L
 2) 7B19 NAV RADIO DME R

 S 024-080
 (2)  
Remove the aerodynamic smoother from around the edge of the DME antenna (AMM 51-31-01/201).

 S 024-004

 (3)  
Remove the DME Antenna:

 (a)  Remove the fasteners from the DME antenna.
 WARNING: BE CAREFUL WHEN YOU USE THE SEALANT REMOVAL TOOL TO BREAK
_______ THE SEAL. TOO MUCH FORCE CAN CAUSE DAMAGE TO THE AIRPLANE SKIN, THE ANTENNA'S ELECTRICAL CABLE, OR THE ANTENNA.
 (b)  Break the seal around the antenna with the sealant removal tool.
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 ALL  ú ú 01 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (c)  
Pull the antenna directly and carefully away from the surface of the airplane to get access to the coaxial connector.

 (d)  
Disconnect the coaxial connector from the antenna.

 TASK 34-55-02-404-006
 3. DME Antenna Installation (Fig. 401)
________________________
 A. Standard Tools and Equipment
 (1)  
Resistance measuring bridge or ohmmeter that
 can measure 0.025 ohm.

 (2)  
Spatula - fillet smoothing tool, hardwood or
 plastic

 

 B. Consumable Materials
 (1)  
G00033 Woven Cheesecloth - BMS 15-5

 (2)  
A00145 Sealant - Aerodynamic, BMS 5-95,
 Class B-2

 (3)  
B00148 Solvent - Methyl Ethyl Ketone (MEK)
 TT-N-261

 (4)  
B00184 Solvent - BMS 11-7

 (5)  
C00855 Alodine

 (6)  
G01395 Corrosion Preventive Compound BMS 3-27

 (7)  
D00294 GREASE (Dow Corning No. 4) - BMS 3-24

 (8)  
C00175 Primer - BMS 10-79 type III

 C. References
 (1)  
AMM 20-11-14/701, Metal Surface

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 34-55-00/501, DME System

 (4)  
AMM 51-21-04/701, Alodine Coating

 (5)  
AMM 51-24-13/701, Water Displacing Corrosion Preventive Compound

 (6)  
AMM 51-31-01/201, Seals and Sealing

 (7)  
IPC 34-55-02 Fig. 1

 D. Access
 (1)  Location Zone
 129 Keel Beam
 139 Keel Beam

 E. Prepare for Installation
 S 864-007
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B8 NAV RADIO DME L
 2) 7B19 NAV RADIO DME R

 F. Procedure
 S 114-026
 (1)  Clean the airplane skin:
 (a)  Remove the old sealant from the airplane skin in the antenna area.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-55-02
 ALL  ú ú 01 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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