34-32-00
 ALL  ú ú 04 Page 505 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MARKER BEACON ANTENNA - REMOVAL/INSTALLATION
____________________________________________
 1.  General
_______
 A.  This subject has two tasks. The first task is the removal of the marker beacon antenna. The second task is the installation of the marker beacon antenna. After the installation of the marker beacon antenna, an operational test must be done.
 B.  The marker beacon antenna is found on the bottom of the fuselage at station 1025 (Fig. 401).
 TASK 34-32-01-004-001
 2.  Marker Beacon Antenna Removal
_____________________________
 A.  Standard Tools and Equipment
 (1)  Spatula sealant removal tool, hardwood or plastic
 B.  References
 (1)  AMM 51-31-01/201, Seals and Sealing
 C.  Access
 (1)  Location Zone
 139 Keel Beam

 D.  Procedure
 S 864-017
 (1) Open these circuit breakers, and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A9 NAV RADIO MKR VOR L

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

 S 144-024

 (3)  
If it is necessary, remove the aerodynamic sealant found on the head of each screw (AMM 51-31-01/201).

 S 024-004

 (4)  
Remove the marker beacon antenna:

 (a)  Remove the antenna mounting screws
 CAUTION: BE CAREFUL WHEN YOU USE A SEALANT REMOVAL TOOL TO BREAK
_______ THE SEAL AROUND THE MARKER BEACON ANTENNA. TOO MUCH FORCE CAN CAUSE DAMAGE TO THE DOOR OR TO THE ANTENNA.
 (b) Break the seal around the marker beacon antenna
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 34-32-01
 ALL  ú ú 03 Page 401 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (c)  
Pull the marker beacon antenna out of the airplane to get to the coaxial connector

 (d)  
Disconnect coaxial connector DB36 from the antenna

 TASK 34-32-01-404-005
 3.  Marker Beacon Antenna Installation__________________________________
 A. Standard Tools and Equipment
 (1)  
Resistance measuring bridge or ohmmeter that can measure 1.0 ohm with an accuracy of |0.01 ohm.

 (2)  
VOR/ILS Ramp Test Set - Instrument Flight Research Type NAV-401L

 B. Consumable Materials
 (1)  
A00247 Sealant - Aerodynamic, BMS 5-95, Class B-1/2

 (2)  
B00184 Solvent - BMS 11-7

 (3)  
B00316 Solvent - Aliphatic Naptha TT-N-95

 (4)  
C00855 Alodine

 (5)  
C00175 Primer - BMS 10-79 type III

 (6)  
D00294 Grease - BMS 3-24

 (7)  
G01395 Compound - Corrosion Inhibiting, BMS 3-27

 (8)  
G00033 Woven Cheesecloth - BMS 15-5

 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 31-61-00/501, Integrated Display System

 (3)  
AMM 51-21-03/701, Corrosion (Removal and Control)

 (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 34-32-01 Fig. 1

 D. Access
 (1)  Location Zone
 139 Keel Beam

 E. Procedure
 S 864-018
 (1) Open these circuit breakers, and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A9 NAV RADIO MKR VOR L

 S 114-019
 (2)  Clean the faying surfaces of the airplane structure and the marker beacon antenna (AMM 51-21-03/701):
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