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

 (4)  
51-21-03/701, Corrosion (Removal and Control)

 (5)  
51-24-13/701, Water Displacing Corrosion Preventive Compound

 (6)  
55-30-02/401, Fin Tip

 (7)  
IPC 34-51-02 Fig. 1

 E. Access
 (1)  Location Zone
 327 Vertical Stabilizer Tip

 F. Procedure
 S 864-006
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A9 NAV RADIO MKR VOR L
 2) 7B21 NAV RADIO VOR R, or

 NAV RADIO MKR VOR R
 S 114-015
 (2)  Clean the mating surfaces of the antenna and airplane structure (Ref 20-11-14/701):
 CAUTION:_______APPLY THE SOLVENT TO THE MATING SURFACES ONLY. MAKE SURE YOU RUB THE SOLVENT OFF THE 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, with a clean BMS 15-5 cloth, to the mating surfaces. 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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747-400
MAINTENANCE MANUAL

 S 394-016

 (3)  
Apply a layer of BMS 3-23 corrosion-preventive compound to the mating surfaces (Ref 51-24-13/701).

 S 424-007

 (4)  
Install the VOR/LOC antenna:

 (a)  
Connect the coaxial connectors to the antenna.

 (b)  
Align the antenna to the screw holes that hold the antenna to the vertical stabilizer.

 (c)  
Install the screws that attach the antenna to the vertical stabilizer.

 S 764-017
 (5)  
Measure the resistance between the inner metal of the antenna plate and the airplane structure (Ref 20-22-01/601). The resistance must be 0.01 ohm maximum.

 S 864-008

 (6)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A9 NAV RADIO MKR VOR L
 2) 7B21 NAV RADIO VOR R, or

 NAV RADIO MKR VOR R
 S 864-009
 (7)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker
 1) 7B8 NAV RADIO DME R
 2) 7B19 NAV RADIO DME L

 S 714-011
 (8)  Do a test of the VOR/LOC antenna:
 (a)  Do the system test part of the adjustment/test for the VOR navigation system (Ref 34-51-00/501).
 S 864-012
 (9)  
If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).

 S 864-013

 (10)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P7 Overhead Circuit Breaker
 1) 7B8 NAV RADIO DME R
 2) 7B19 NAV RADIO DME L

 (11)
 Install the vertical stabilizer tip (Ref 55-30-02/401).

 S 414-014
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