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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS)
___________________________________________________ DIRECTIONAL ANTENNA - REMOVAL/INSTALLATION
__________________________________________
 1.  General_______
 A.  This procedure has two tasks. One is the removal of the TCAS directional antenna; the other is the installation of the TCAS directional antenna.
 B.  The TCAS has two directional antennas. The top antenna is installed on the top of the airplane at station 450. The other is installed on the bottom of the airplane at station 490.4 (Fig. 401)..
 TASK 34-45-02-004-098
 2.  TCAS Directional Antenna Removal________________________________
 A.  Equipment
 (1)  Sealant removal tool - hardwood or plastic
 B.  Consumable Materials
 (1)  B00184 Solvent - BMS 11-7
 C.  References
 (1)  AMM 20-11-14/701, Metal Surfaces
 D.  Access
 (1)  Location Zones 223 Forward Upper Deck Passenger Cabin 125 Area Below Forward Cargo Container Compartment
 E.  Procedure
 S 864-068
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A5, TCAS

 (2)  
Remove the TCAS antenna.

 S 024-099
 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 BASE OF THE ANTENNA.
 (a)  
Break the sealant that cover the screws that attach the antenna to the airplane.

 (b)  
Remove the screws.

 (c)  
Use force around the antenna with the sealant removal tool until the seal is fully broken.

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 34-45-02
 ALL  ú ú 02 Page 401 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

0-RING
AERODYNAMIC SEALANT SEALANT LOCATION
A-A

1
INSTALLED IN THE FOUR INNER
COUNTERSUNK HOLES

TCAS Antenna Installation Figure 401
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 34-45-02
 ALL  ú ú 03 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 CAUTION: MOVE THE ANTENNA ONLY AS FAR AS NECESSARY TO DISCONNECT THE
_______ CABLES. DAMAGE TO THE ANTENNA CABLES CAN OCCUR IF YOU PULL THE CABLES.
 (d)  
Move the antenna until you can get access to the antenna cable connectors.

 (e)  
Disconnect the antenna cables.

 NOTE: Do not let the antenna cables retract into the
____ fuselage. Put the cap at the end of the cable to prevent sealant contamination.
 (f)  
Remove the TCAS antenna.

 (g)  
Remove the sealant from the airplane skin in the antenna area (AMM 20-11-14/701).

 (h)  
Use a clean rag and the solvent, BMS 11-7, to clean the airplane surface in the antenna area (AMM 20-11-14/701).

 TASK 34-45-02-404-100
 3. TCAS Directional Antenna Installation
_____________________________________
 A. Equipment
 (1)  Resistance measuring bridge or ohmmeter that
 can measure 0.001 ohm

 B. Consumable Materials
 (1)  
A00145 Sealant - BMS 5-95, Class B-2

 (2)  
B00184 Solvent - BMS 11-7

 (3)  
D00294 Grease - BMS 3-24

 (4)  
G00009 Coating - Conversion - Alodine 1200

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

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

 (3)  
AMM 34-45-00/501, TCAS

 (4)  
AMM 51-24-13/701, Water Displacing Corrosion Prevention Compound

 (5)  
　
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