WHEEL WELLS - CLEANING/PAINTING
1. General
A. This section describes the removal and application of corrosion inhibitor (removable with an alkaline cleaner) effective against corrosion and contamination.
B. Pressure application of cleaners is essential to effective corrosion inhibitor and contamination removal, particularly in inaccessible areas of the wheel well. However, the use of pressure cleaning must be strictly controlled to preclude possible damage to wheel well components and finishes. The pressure equipment in par. 2 or equivalent units may be used provided the pressure on the airplane surfaces does not exceed 50 psi. For equipment listed in par. 2, effective cleaning is accomplished at 12 to 20 inches distance between the pressure unit nozzle and airplane surfaces. The equipment shall not be used at distances less than 12 inches between nozzle and airplane surfaces.
C. Light duty cleaning should be accomplished per Chapter 12, Cleaning and Washing.
Equipment and Materials
A. Cleaning Solutions (Fig. 701)
B. Pressure Application Equipment
(1)
Pro-1 Cleaning Compound Proportioning Unit - B & B Chemical Co., Inc., Miami, Florida, or equivalent
(2)
Hydroblitz Unit - Oakite Products Co., New York, New York, or equivalent
C. Sponges, Cellulose - L-S-626
D. Heavy duty cleaners suitable for carbon deposit removal (Ref Chapter 20, Cleaners)
E. Soft bristle fiber brushes
F. Soft wipers, cheesecloth, surgical gauze, new white rags, or equivalent. All wiping materials shall contain less than 0.75% by weight of oil and shall be free of silicone.
G. Toluene
545
Sep 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-14-0 Page 701
H. Corrosion Inhibiting Compound - BMS 3-23 or LPS 3 (Ref 20-30-21)
I. Masking tape
J. Respiratory protection equipment
3. Wheel Well Corrosion Inhibitor Removal
A. Remove tire burst protection screens and clean separately.
B. Spray apply cleaning solution on all surfaces of the wheel well (Fig 701).
NOTE: Do not use cleaning solutions or rinse water at temperatures greater than 120°F. Keep cleaning solution from contacting bearing surfaces.
C. Allow cleaning solution to soak 10 to 15 minutes. Keep surfaces wet with the solution during soak.
D. After soaking, pressure spray additional cleaning solution on the surfaces to flush off the dissolved contamination. Clean the ceiling of the wheel well first. Clean the wheel well in sections: half the ceiling surfaces, etc., flushing away from cleaned areas.
E. Pressure spray rinse thoroughly with clean water. Complete removal of the cleaning materials is essential for reapplication of the corrosion inhibitor.
F. Dry by sponging and blowing out all excess water around wheel well components with clean, dry air.
G. If additional cleaning is necessary, proceed per par. 4.
Dilution - 1 Part Remover
Remover to the Following Parts Water
GMC 528B 3
Kelite 28 4
CeeBee 280 4
Oakite 204 4
Turco Jet Clean C 5
DuBois C-1102 4
Calla 301 4
Tec Formula No. 1 4
Pacific Chemical B-823 3
Metaclean AC 4
Dilution of Cleaning Solution 545
53-14-0 Figure 701 Sep 20/82
Page 702
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Wheel Well Cleaning
A. Heavy Duty Cleaning
NOTE: Keep cleaning solution from contacting bearing surfaces
(1)
Scrub small areas at a time with heavy duty cleaners, then remove by rinsing the loosened contamination.
(a)
Clean the ceiling of the wheel well first then the sides from the top down to prevent soiling of cleaned areas.
(b)
Apply the cleaning solution to areas not being scrubbed and allow to soak to loosen the contamination before scrubbing.
(c)
After all areas have been cleaned, rinse thoroughly to remove all cleaning solution. Complete rinsing can be facilitated by pressure cleaning with a dilute solution (1 part cleaner to 15-20 parts water) of the cleaners in Fig. 701, followed by clean water rinsing.
(2)
Wheel well surfaces must be dry before protective coating application. Remove all excess rinse water by sponging, and blow out all water around wheel well components using clean, dry air.
(3)
Lubricate all control cables per Chapter 12, Cable Lubrication. When spot cleaning is all that is required prior to coating, inspect control cables for lubricant. If lubricant has been removed by cleaning, the control cables must be relubricated.
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