(h)
Install the screws at the forward edges of the fairing section.
(i)
Put the forward section in its position.
(j)
Install the screws.
S 394-017
(14) Apply sealant in the space between:
(a)
the mid fairing parts.
(b)
the mid fairing and the winglet
(c)
the mid fairing and the wing.
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A
747-400 MAINTENANCE MANUAL
WINGLET CONDUCTING STRIP - REPAIRS
__________________________________
1. General_______
A. This procedure contains instructions for the repair of inboard or outboard winglet conductor strips.
(1)
The conducting strip should be replaced or repaired if damage extends across more than half the width of the strip.
(a) Exposed areas less than half the width of the conductive strip may have touchup conductive coating applied using approved coatings per BMS 10-21.
(2)
This repair option is intended to be used to repair damage to the inboard (upper) or outboard (lower surface) conductive strip.
(a)
Remove any damaged portions of the conductive strip.
(b)
Scrape or peel the strip from the winglet where possible. Use care to prevent damage to the carbon fiber.
(c)
Remove the remaining residue by sanding with aluminum oxide sandpaper.
(3)
Install 0.020 6061-T4 bare sheet splice strips.
(a)
Apply chemical conversion coating to the strips prior to installation (SRM 51-20-01).
(b)
Small amounts of BMS5-92 type 1 resin may be used to hold the splice in place.
(4)
Overlay the repair area with one ply of BMS 9-3, type 120 fiberglass and cure using BMS 8-301, class 2 resin (SRM 51-70-06).
(5)
Do a continuity of the splices. Maximum 0.010 OHM maximum resistance allowed.
TASK 57-28-01-308-001
2. Repair the Inboard Conducting Strip (Fig. 801)___________________________________
A. Standard Tools and Equipment
(1)
Meter - Bonding (AMM 20-22-01/601, Electrical Bonding)
(2)
Scraper - Plastic or Hardwood
B. Consumable Materials
(1)
B00000 Cleaner - Alkaline, Ridolene No. 53
(2)
A00966 Compound - EC-2216 Part A and Part B
(3)
G00000 Paper - Aluminum Oxide, 240-grit or finer
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(4)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(5)
G00033 Cheesecloth
(6)
A00247 Sealant - BMS 5-95
(7)
C00064 Coating - Surface treatment, MIL-C-5541 (Alodine 1200 or 1200S)
(8)
G00000 Aluminum Sheet - 1100-0 or 5052, 0.020 inch thick
C. References
(1) AMM 23-61-00/201, Static Dischargers
D. Access
(1) Location Zone
539 Winglet, Left
639 Winglet, Right
E. Remove the conducting strip.
S 038-002
(1)
Trim the conducting strip near the base of each static discharger found at the ends of the damaged area.
S 018-003
(2)
Remove the static dischargers if it is necessary (AMM 23-61-00/201).
S 358-004
(3)
Remove the damaged parts of the conducting strip.
(a)
Scrape or peel strip from winglet where possible. Use care to prevent damage to the carbon fiber.
(b)
Complete the removal of residue by sanding with aluminum oxide paper.
(c)
Remove the strip from the winglet where it is possible.
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