(4)  
34-31-00/501, Instrument Landing System

 (5)  
51-21-03/701, Corrosion (Removal and Control)

 (6)  
51-24-13/701, Water Displacing Corrosion Preventive Compound

 (7)  
53-52-01/201, Nose Radome

 (8)  
IPC 34-31-51, Fig. 1

 E. Access
 (1)  Location Zone
 111 Nose Radome

 F. Procedure
 S 864-026
 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)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A6 NAV RADIO MMR L
 2) 7B6 NAV RADIO MMR C
 3) 7B17 NAV RADIO MMR R

 S 114-027
 (2)  Clean the mating surfaces of the antenna and airplane structure (Ref 20-11-14/701):
 CAUTION:_______APPLY THE SOLVENT TO MATING SURFACES ONLY. MAKE SURE YOU RUB OFF THE SOLVENT FROM OTHER SURFACES. IF THE SOLVENT STAYS ON A SURFACE FOR A LONG TIME, IT CAN CAUSE DAMAGE TO THE SURFACE FINISH.
 (a)  
Apply aliphatic naphtha TT-N-95 solvent to the mating surfaces of the antenna and the airplane structure with a clean BMS 15-5 cloth. Use light pressure (Ref 51-21-03/701)

 (b)  
Use a clean cloth and clean the surface again

 (c)  
Do these two steps until the metal of the mating surfaces is bright, clean, and dry.

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A 747-400 MAINTENANCE MANUAL
 (3)  S 394-028Apply a layer of BMS 3-23 corrosion-preventive compound to the mating surfaces (Ref 51-24-13/701).
 (4)  S 424-029Install the glide slope capture antenna: (a) Connect the coaxial connectors to the antenna (b) Align the antenna to the screw holes, which mount the antenna to the bulkhead (c) Install the screws to attach the antenna to the bulkhead.
 (5)  S 764-030Measure the resistance between the antenna plate and the nose radome (Ref 20-22-01/601). The resistance must be 0.01 ohm maximum.
 (6)  S 864-031Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7 Overhead Circuit Breaker Panel 1) 7A6 NAV RADIO MMR L 2) 7B6 NAV RADIO MMR C 3) 7B17 NAV RADIO MMR R
 (7)  S 714-032Test the glide slope capture antenna: (a) Do the Prepare for the System Test and the Glide Slope parts of the ILS System Test (Ref 34-31-00/501).
 (8)  S 864-033If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).
 (9)  S 414-034Do this task to close the nose radome: (Ref 53-52-01/201). Close Nose Radome

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A

747-400
MAINTENANCE MANUAL

WEATHER RADAR ANTENNA (EXAMPLE)
CAPTURE ANTENNA
Glide Slope Capture Antenna Installation
Figure 401

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A
747-400
MAINTENANCE MANUAL

A

Nose Radome Unlatching
Figure 402

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