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 (a)  Connect the coaxial cables and the electrical cables to the relays and hand tighten them.
 S 424-031
 (6)  Install the left glide slope antenna coaxial relay: (a) Align the relay with the holes in the bottom of the P31 panel (b) Install the screws that attach relay B404 to the airplane.
 S 764-034
 (7)  Measure the resistance between the relay switch case and the airplane structure (Ref 20-22-01/601). The resistance must be 0.01 ohm maximum.
 (a)  Connect the coaxial cables and the electrical cable to the relay and hand tighten them.
 S 424-035
 (8)  Install the right glide slope antenna coaxial relay: (a) Align relays B119 and B405 and the spacers with the holes in the P31 panel (b) Install the screws to attach relays B119 and B405 to the airplane.
 S 764-036
 (9)  Measure the resistance between the relay switch case and the airplane structure (Ref 20-22-01/601). The resistance must be 0.01 ohm maximum.
 (a)  Connect the coaxial cables and the electrical cable to the relay and hand tighten them.

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747-400 MAINTENANCE MANUAL
 S 864-037
 (10) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D22 ILS ANT SW L
 2) 7D23 ILS ANT SW C
 3) 7D24 ILS ANT SW R

 S 714-038
 (11) Test the glide slope track antenna:
 (a)  Do the Prepare for the System Test and the Glide Slope parts of the ILS System Test (Ref 34-31-00/501).
 S 864-039
 (12) If electricl power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).
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747-400
MAINTENANCE MANUAL

GLIDE SLOPE ANTENNA MAIN EQUIPMENT CENTER SWITCH PANEL, P31 RACK E1
SEE A
STATION 400 
BULKHEAD 
FWD 
STA 
400 

B119 CENTER GLIDE SLOPE
ANTENNA COAXIAL RELAY GLIDE SLOPE ANTENNA SWITCH PANEL, P31
B405 RIGHT GLIDE SLOPE ANTENNA COAXIAL RELAY SEE B P31
B404 LEFT GLIDE SLOPE ANTENNA COAXIAL RELAY
GLIDE SLOPE ANTENNA GLIDE SLOPE ANTENNA SWITCH PANEL, P31 COAXIAL RELAYS
A B
Glide Slope Antenna Coaxial Relay Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 VOR/LOC RF POWER DIVIDER - REMOVAL/INSTALLATION
_______________________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is the removal of the VOR/LOC rf power divider. The second task is the installation of the VOR/LOC rf power divider. Parts of the ILS System Test must be done after the installation of the VOR/LOC rf power divider.
 TASK 34-31-07-004-011
 2.  VOR/LOC RF Power Divider Removal________________________________
 A.  General
 (1)  
There are three VOR/LOC rf power dividers installed in the E1 electronics equipment rack in the main equipment center. They are installed on the left end of the No. 6 shelf. The equipment numbers are B8316 for the left, B8317 for the right, and B8318 for the right/center rf power dividers.

 (2)  
The removal procedures are the same for each VOR/LOC rf power divider.

 B.  Access
 (1)  Location Zone 117 Electrical and Electronics Compartment, LH
 C.  Procedure
 S 024-012
 (1)  Remove the VOR/LOC rf power divider:
　
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