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A
747-400 MAINTENANCE MANUAL
 AIR TRAFFIC CONTROL (ATC) ANTENNA - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is the removal of the ATC antenna. The second task is the installation of the ATC antenna.
 B.  Two ATC antennas are installed on the fuselage. The bottom ATC antenna is installed on the bottom of the fuselage on the buttock line at station
 570. The top ATC antenna is installed on the top of the fuselage at RBL 4.5 at station 610. The procedure is applicable to the top and the bottom antennas. Safety precautions must be taken when removing/installing the top antenna.
 TASK 34-53-03-004-001
 2.  ATC Antenna Removal___________________
 A.  Standard Tools and Equipment
 (1)  Sealant removal tool - hardwood or plastic
 B.  References
 (1)  51-31-01/201, Seals and Sealing
 C.  Access
 (1)  Location Zone 223 Fwd Upper Deck Passenger Cabin 125 Area Below Forward Cargo Container Compartment
 D.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R

 S 144-003
 (2)  
Remove the aerodynamic smoother from around the ATC antenna base (AMM 51-31-01/201).

 S 024-004

 (3)  
Remove the ATC Antenna

 (a) Remove the fasteners from the ATC antenna base.
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 34-53-03
 ALL  ú ú 02 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CAUTION: BE CAREFUL WHEN YOU USE FORCE WITH THE SEALANT REMOVAL
_______ TOOL TO BREAK THE ANTENNA SEAL. TOO MUCH FORCE CAN DAMAGE THE AIRPLANE SKIN OR THE ELECTRICAL CABLE AT THE ANTENNA BASE.
 1) Use force around the antenna with the sealant removal tool until the seal is fully broken. 2) Pull the ATC antenna until you can get access to the antenna cable connector at the base of the antenna.
 S 034-005
 (4)  
Disconnect the coaxial connector DB101 on the upper ATC antenna or DB102 on the lower ATC antenna.

 S 034-006

 (5)  
Make sure the coaxial connector does not fall back into the fuselage.

 TASK 34-53-03-404-007
 3.  ATC Antenna Installation (Fig. 401)________________________
 A. Standard Tools and Equipment
 (1)  
Resistance measuring bridge or ohmmeter capable of measuring 0.025 ohm with an accuarcy of |0.001 ohm.

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

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

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

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

 (4)  
C00175 Primer - BMS 10-79 Type III

 (5)  
C00855 Alodine

 (6)  
D00294 Grease BMS 3-24

 (7)  
G00009 Corrosion Preventive Compound BMS 3-27

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

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

 (3)  
AMM 51-24-13/701, Water Displacing Corrosion Prevention Compound

 (4)  
AMM 51-31-01/201, Seals and Sealing

 (5)  
IPC 34-53-03-01 Fig. 1

 D. Access
 (1)  Location Zones 223 Fwd Upper Deck Passenger Cabin, LH 125 Area Below Forward Cargo Container Compartment, LH
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 34-53-03
 ALL  ú ú 03 Page 402 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TOP ATC
ANTENNA (STA 610)

IS INSTALLED ON THE TOP ANTENNA
ATC Antenna Installation Figure 401
C15273
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