(g)
Install nose radome tip rain erosion protection as required (Ref 53-52-21 AR).
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C. Nose Radome Painting - Super Koropon Antistatic Coating
(1)
Equipment and Materials
(a)
Abrasive paper, 280 grit or finer
(b)
Solvents - Aliphatic, naphtha - TT-N-95 (Ref 20-30-31)
(c)
Masking tape
(d)
Antistatic Coating - Super Koropon Fluid Resistant, base component 528-T-202, curing solution 910-006, DeSoto, Inc., Berkeley, California
(e)
Vacuum Tube Multimeter - Model No. 427A, Hewlett-Packard Company, Palo Alto, California
(f)
Probe - Surface Resistivity Measurement - ST895A-3 (preferred), or conductive electrical tape (Ref 20-30-51) (alternate)
(2)
Prepare for Painting
(a)
Prepare surface. 1) Abrade and solvent clean as necessary. If any pin holes exist, fill per Chapter
51, Prepaint Cleaning and Pretreatment.
2) Mask areas not to be painted.
3) Perform final cleaning with naphtha.
(b)
Mix paint.
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1) Antistatic coating is supplied in two component kits consisting of DeSoto 528-T-202 base material and DeSoto 910-006 curing solution. Mix material in accordance with the following: a) Agitate base material thoroughly prior to mixing. b) Add one part by volume catalyst to one part by volume base material while
stirring base material.
c) Allow mixture to stand at least 1 hour before using.
H26745
500 Resistance Measurement Nov 15/80 Figure 701 Page 704A/704B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
d) Immediately after mixing, mark container with a label stating date and hour
of mixing, name of workman doing mixing and pot life expiration time.
e) Mixed material has a usable pot life of 3 hours at room temperature 70 ± 5°
F. f) Scrap all mixed material whose pot life has expired.
(3) Paint Nose Radome
(a)
Apply coating by brush or spray to a dry film thickness of 0.8 ± 0.2° mil.
(b)
Allow coating applied to countersink areas to dry at least 20 minutes before
installation of fasteners.
(c)
Allow coating to dry at least 4 hours before overcoating or before resistance measurements are taken.
NOTE: To measure resistance of antistatic coating in the following steps, use the surface resistivity measurement probe (preferred) or use a multimeter and conductive electrical tape (alternate).
(d)
Measure resistance of antistatic coating as follows using a multimeter and the surface resistivity measurement probe (preferred). 1) Connect probe to multimeter and press probe firmly against surface of radome. 2) Take a minimum of 5 measurements per quadrant. Find average of 20 readings
and multiply by 10.
3) Measurement should fall between 1 and 100 megohoms.
(e)
Measure resistance of antistatic coating as follows, using a multimeter and conductive electrical tape (alternate method). 1) Place two strips of conductive electrical tape 1 inch wide by 4 inches long, 0.4
inch apart (Fig. 701)
NOTE: Place two strips of tape in each quadrant of radome. Use tape only once.
2) Connect multimeter to tape and measure resistance. Take a minimum of 5 measurements per quadrant.
3) Find the average of the 20 readings and multiply by 10. Measurement should fall between 1 and 100 megohms.
(f) If measurement does not fall between 1 and 100 megohms, proceed as follows: 1) Sand with 280 grit or finer abrasive
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D. Nose Radome Painting - BMS 10-60, Type II enamel
(1)
Equipment and Materials
(a)
Masking tape
(b)
Multimeter - 1-100 megohm range, commercially available
(c)
Paint Spray Equipment
(d)
Erosion Coating - Prestec Enamel, No. 2381
(e)
Primer - BMS 10-79, Type II
(f)
Enamel - BMS 10-60, Type II
(g)
Filler - Static Conditioner 28-C-1
(h)
Surfacer - Dexter 8-W-5
(i)
Antistatic Paint - Black DeSoto - BMS 10-21, Type II
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