WING-TO-BODY FAIRING BLOWOUT PANEL - REMOVAL/INSTALLATION
1. General
A. Panels are hinged one-side and secured with shear rivets through panel clips on the other.
2. Equipment and Materials
A. Sealant - Pro-Seal 898 (optional: BMS 5-79, Class B)
B. Parting Agent - Delco X-769 or equivalent
C. Solvent - Final Cleaning Prior to General Sealing (Series 92) (Ref AMM/SOPM 20-30-92)
D. Wooden or plastic spatula
E. Rivets - MS20470A, 3/32-inch diameter, and MS20470A, 1/8-inch diameter
3. Remove Wing-to-Body Fairing Blowout Panel
A. If panel has blown out partly or completely, open underwing fairing and remove rivets by drilling.
4. Prepare to Install Wing-to-Body Fairing Blowout Panel
A. Clean old sealant from faying surfaces by scraping with wooden or plastic spatula and then cleaning with solvent.
B. Apply abrasion resistant finish and parting agent to the outside face of the fairing lip (Ref Chapter 51, Maintenance Practices).
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C. Remove sealant from gap between the blowout panel and panel cut out, if installed.
D. To prevent blowout panel from rocking and assist in panel seating, apply sealant (Pro-Seal 898138, or BMS 5-79, Class B) just prior to installing panel to inside face of the panel lip as a fillet (Ref Chapter 51, Maintenance Practices).
CAUTION: APPLY HAND PRESSURE TO SEAT PANEL. DO NOT DISTORT OR PRELOAD PANEL DURING INSTALLATION. REMOVE ALL EXCESS SEALANT FROM INSIDE AND OUTSIDE PANEL. USE MINIMUM AMOUNT TO PREVENT A PANEL OUT OF FAIR CONDITION.
E. After sealant has cured, open and close panel to ensure there is no sealant bonding panel to fairing.
5. Install Wing-to-Body Fairing Blowout Panel
A. Check attachment clips for damage.
B. Install panels with rivets two places using one MS20470A rivet of 3/32-inch diameter in the aft outboard attach point and one MS20470A rivet of 1/8-inch diameter on the forward outboard attach point.
CAUTION: PROPER FUNCTIONING OF BLOWOUT PANEL DEPENDS ON USE OF RECOMMENDED RIVETS.
C. Close and latch fairing.
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AFT WING-TO-BODY FAIRING - REMOVAL/INSTALLATION
1. Remove Aft Wing-to-Body Fairing
A. Disconnect ADF sense antenna coupler per Chapter 34, ADF Sense Antenna Couplers -Removal/Installation.
B. Open overwing emergency exit light circuit breakers on P18 and disconnect wiring at light assembly in fairing.
C. Remove fairing fasteners.
NOTE: Different types of fasteners are used to attach the fairing panels. Stainless steel fasteners and dimple washers fasten the panel and also provide electrical bonding. Make sure you install these fasteners in the same locations from where you removed them.
D. Remove fairing.
NOTE: The spring seal between the aft fairing panel and the torque tube cutout panel is not permanently attached. The seal may fall loose during removal.
2. Install Aft Wing-to-Body Fairing
A. Install fairing by installing fasteners.
(1)
Examine the mating surfaces of the structure and the fairing panel.
(a) Make sure all mating surfaces are clean and free of any contamination or painting.
(2)
Apply the corrosion preventative compound to all of the mating surfaces of the airplane structure that touch the wing-to-body fairing panels.
(3)
Examine the fasteners and the area around the fastener holes to make sure they are clean and free of any contamination.
NOTE: Stainless steel fasteners are usually located at four locations per panel, one at each corner.
(4)
Use aliphatic naphtha to clean the fasteners and area on the fairing panel around the fastener holes.
(5)
Remove any paint or prime covering the conductive surface of the panel in the area of the dimple washers.
(6)
Prepare the surface for the anti-static coating.
(a)
Apply anti-static coating over the exposed areas.
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