A

Nose Radome Unlatching
Figure 402

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747-400 MAINTENANCE MANUAL
 GLIDE SLOPE CAPTURE ANTENNA - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This subject has two tasks. The first task is the removal of the glide slope capture antenna. The second task is the installation of the glide slope capture antenna. Parts of the ILS System Test must be done after the installation of the glide slope capture antenna.
 TASK 34-31-03-004-021
 2.  Glide Slope Capture Antenna Removal (Fig. 401 and Fig. 402)
___________________________________
 A.  General
 (1)  
There are two glide slope capture antennas installed in the nose radome. The lowest antenna is the left and right glide slope capture antenna (B66). The antenna above it is the center glide slope capture antenna (B120).

 (2)  
The removal procedures are the same for each antenna.

 B.  Reference
 (1)  53-52-01/201, Nose Radome
 C.  Access
 (1)  Location Zone
 111 Nose Radome

 D.  Procedure
 S 864-022
 WARNING: MAKE SURE THE WEATHER RADAR POWER IS OFF AND THE ANTENNA CANNOT
_______ SCAN. INJURY TO PERSONS CAN OCCUR IF THE WEATHER RADAR TRANSMITS OR IF THE ANTENNA IS PERMITTED TO SCAN.
 (1) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A6 NAV RADIO MMR L
 2) 7B6 NAV RADIO MMR C
 3) 7B17 NAV RADIO MMR R

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747-400 MAINTENANCE MANUAL
 S 014-023
 (2)  
Do this task to open the nose radome: Open Nose Radome (Ref 53-52-01/201).

 S 024-024

 (3)  
Remove the glide slope capture antenna:

 (a)  
Remove the screws that attach the antenna to the airplane structure

 (b)  
Pull the antenna away from the bulkhead to get to the coaxial connectors. The coaxial connectors are found on the aft side of the antenna

 (c)  
Disconnect the coaxial connectors from the antenna. The connector numbers are DB66A and DB66B for the bottom antenna and DB120 for the top antenna.

 TASK 34-31-03-404-025
 3.  Glide Slope Capture Antenna Installation (Fig. 401 and Fig. 402)________________________________________
 A. General
 (1)  
There are two glide slope capture antennas installed in the nose radome. The lowest antenna is the left and right glide slope capture antenna (B66). The antenna above it is the center glide slope capture antenna (B120).

 (2)  
The installation procedures are the same for each antenna.

 B. Standard Tools and Equipment
 (1)  Resistance measuring bridge or ohmmeter that can measure 0.010 ohm with an accuracy of |0.001 ohm
 C. Consumable Materials
 (1)  
B00316 Solvent - Aliphatic Naphtha TT-N-95

 (2)  
G00009 Corrosion Preventive Compound (Dow Corning No. 4) - BMS 3-23

 (3)  
G00033 Woven Cheesecloth - BMS 15-5

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

 (2)  
20-22-01/601, Electrical Bonding

 (3)  
24-22-00/201, Manual Control

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