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A
747-400 MAINTENANCE MANUAL
S 344-020
(10) Fill the clearance between the parts of the leading edge with sealant (Ref AMM 51-31-01/201), (Ref SOPM 20-50-11).
NOTE: Make sure the flushness is less than | 0.01 inch.
____
S 344-029
(11) Fill the clearance between the part of the leading edge and the skin for the forward torque box with sealant (Ref AMM 51-31-01/201), (Ref SOPM 20-50-11).
NOTE: Make sure the flushness is less than | 0.01 inch.
____
S 414-021
(12)
Install the access door if you removed it.
S 864-033
(13)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) On the overhead curcuit breaker panel, P7.
1) 7E12, HF L
2) 7E15, HF R
S 714-034
(14) Do the operational test - HF Communication System (Ref 23-11-00/501).
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55-30-01
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747-400 MAINTENANCE MANUAL
VERTICAL STABILIZER REMOVABLE LEADING EDGE - APPROVED REPAIRS
_____________________________________________________________
1. General_______
A. This procedure contains two tasks. The first task gives instructions to repair with tape the fiberglass leading edge section which is the HF antenna cover. The second task of this procedure gives instructions to repair the Rain-Erosion Resistant Coating (RERC) on the vertical stabilizer.
B. If the rain erosion-resistant layer is worn away, you can apply tape over the fiberglass section. It is best if you replace the Rain Erosion-Resistant Coating (RERC). Do not use antistatic coatings. Refer to the end of this procedure for the repair instructions of the Rain-Erosion Resistant Coatings (RERC).
NOTE: Antistatic rain erosion-resistant coatings are not allowed for use
____ on the fiberglass leading edge HF antenna cover. If you use the antistatic rain erosion-resistant coating, HF radio performance will badly decrease. Radio transmissions will cause the deterioration of the antistatic layer.
TASK 55-30-01-308-000
2. Repair the Vertical Stabilizer Removable Leading Edge (Fig. 801)_____________________________________________________
A. Equipment
(1)
Brush - Commercially available
(2)
Felt tip marker - Commercially avialable
(3)
Hot air blower - Commercially available
(4)
Rubber applicator (squeegee) - Commercially available
(5)
Rubber roller - Commercially available
B. Consumable Materials
(1)
B00340 Abrasive paper - 240 grit (minimum grit number)
(2)
G00033 Cheesecloth - BMS 15-5
(3)
Sealer - 683-3-2 Clear
(4)
Catalyst - X-310A
(5)
Solvents
NOTE: Use one of these solvents:
____
(a)
B00178 Acetone - 0-A-51
(b)
B00148 Methyl Ethyl Ketone - TT-M-261
(c)
B00090 1,1,1 Trichloroethane - MIL-T-81533A
(6)
3M Polyurethane Outdoor Tape 8671.
(7)
B00052 Soap, Liquid
C. References
(1) Standard Overhaul Practices Manual SOPM 20-44-03, Application of Polyurethane Rain Erosion Resistant Coatings
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