D. Access
 (1)  Location Zone
 321 Vertical Stabilizer - Removable Leading Edge

 E. Procedure
 S 118-018
 WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (1)  
Clean the surface that you will repair with a cheesecloth that is soaked with solvent, Series 87 (AMM 20-30-87).

 S 118-003

 (2)  
Dry the surface with a clean cheesecloth.

 S 348-004
 CAUTION: DO NOT RUB THE SURFACE WITH THE ABRASIVE PAPER FOR TOO MUCH
_______ TIME OR WITH TOO MUCH PRESSURE. IF YOU ARE NOT CAREFUL, DAMAGE TO THE FIBERS CAN OCCUR. THE DAMAGE TO THE FIBERS WILL DECREASE THE STRENGTH OF THE PART.
 (3)  
Lightly rub the surface with the abrasive paper.

 (4)  
Clean the area with a clean cheesecloth that is moist with solvent.

 (5)  
Dry the surface with a clean, dry cheesecloth.

 S 118-005
 S 118-006
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 S 348-009
 (6)  Prepare the tape as follows:
 (a)  Measure and cut the tape to have a length that is 1 inch more than the eroded area.
 NOTE: As an example, for an eroded area of 1 inch, it is
____ necessary to have a 2-inch length of tape.
 (b)  Cut the tape to a width of 6 inches.
 S 348-010
 (7)  
Make a mark, with a felt tip marker, at the edge of the area where you will apply the tape.

 S 348-007

 (8)  
Apply the tape as follows:

 NOTE: Use Method A or Method B.
____
 (a)  
Method A 1) Remove the paper backing for approximately 1 inch along the length of the tape.

 2)  Push the tape in position as you continuously remove the paper backing.

 (b)  
Method B 1) Prepare a solution of one part liquid soap to 50 parts

 water. 2) Make the surface wet with the soap and water solution.
 NOTE: The wet surface lets you adjust the tape before it
____
 bonds fully.

 3) Remove the paper backing from the tape. 4) Find the highest area on the fin that has erosion. Apply the tape first in that area.
 5)  Push on all of the tape until it is satisfactorily attached to the surface. Make sure you do not make too many air bubbles below the tape.
 6)  Start at the centerline of the tape, and remove all the detergent solution and the air bubbles with a rubber squeegee.
 7) Rub the tape with a clean cheesecloth or a small rubber roller. 8) Remove all the caught air bubbles with a small pin and rub the tape again.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 358-008
 (9)  
Fully dry the surface with a hot air blower.

 S 398-017

 (10)
 Apply the edge sealer with a brush to make an overlap of 3/8 inch on each side of the tape edge.

 TASK 55-30-01-308-019
 3.  Vertical Stabilizer Removable Leading Edge RERC Repair (Fig. 801, Fig. 802)______________________________________________________
 A. General
 (1)  These tasks are for the repair of the Rain-Erosion-Resistant Coating (RERC) with Caapcoat, when the damage extends over much of the surface of the RERC, and for different types of damage when only minor repair to the topcoat of the RECR is required.
　
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