C.  Removal Procedure
 S 864-001
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the overhead circuit breaker panel P7: 1) 7A06 MMR L 2) 7B17 MMR R
 S 024-002
 (2)  Remove the GPS antenna:
 CAUTION: BE CAREFUL WHEN YOU USE THE SEALANT REMOVAL TOOL TO BREAK
_______ THE SEAL. TOO MUCH FORCE CAN CAUSE DAMAGE TO THE AIRPLANE SKIN, THE COAXIAL CABLE, OR THE ANTENNA.
 (a)  
Use the sealant removal tool to break the seal all around the antenna.

 (b)  
Remove the sealant that covers the antenna screws.

 (c)  
Remove the antenna screws.

 CAUTION: MOVE THE ANTENNA THE LEAST DISTANCE NECESSARY TO
_______ DISCONNECT THE CONNECTOR. DAMAGE TO THE CABLE CAN OCCUR IF YOU PULL THE CABLE WITH TOO MUCH FORCE.
 (d)  Carefully pull the antenna until you can get access to the connector.
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747-400
MAINTENANCE MANUAL

Global Positioning System - Antenna Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 (e)  Disconnect the connector.
 NOTE: Make sure the cable and connector do not fall into the
____ airplane fuselage.
 (f)  Remove the GPS antenna.
 TASK 34-58-02-424-004
 3. GPS Antenna Installation (Fig. 401).
________________________
 A. Equipment
 (1)  
Resistance measuring bridge or ohmmeter

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

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

 (2)  
B00184 Solvent - BMS 11-7

 (3)  
C00175 Primer - BMS 10-79, Type III

 (4)  
C00855 Alodine

 (5)  
D00254 Compound, Silicone - MIL-S-8660

 (6)  
D00294 Grease - BMS 3-24

 (7)  
G00009 Corrosion Preventive Compound - BMS 3-27

 (8)  
G00033 Woven Cheesecloth - BMS 15-5

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

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

 (3)  
AMM 51-21-04/701, Alodized Surfaces

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

 D. Access
 (1)  Location Zones
 243 Area Above Ceiling, Left
 244 Area Above Ceiling, Right

 E. Installation Procedure
 S 864-005
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  On the overhead circuit breaker panel P7: 1) 7A06 MMR L
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747-400 MAINTENANCE MANUAL
 2) 7B17 MMR R
 S 114-007
 (2)  
Clean the airplane skin and the inner antenna surface with the solvent, BMS 11-7 (AMM 20-11-14/701).

 S 144-006

 (3)  
If there is corrosion on the airplane skin below the antenna, prepare the airplane skin as follows:

 (a)  
Remove the corrosion (AMM 20-11-14/701).

 (b)  
Clean the airplane skin in the area of the corrosion with the solvent, BMS 11-7 (AMM 20-11-14/701).

 (c)  
　
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