(j)
Solvent - Aliphatic Naphtha, TT-N-95
(2)
References
(a)
51-21-21-7, Prepaint Cleaning and Treatment
(b)
51-21-171-7, Decorative Exterior Paint System
(c)
51-21-71-7, Conductive Coating for Exterior Fiberglass and Kevlar
(d)
20-30-31, Cleaners and Polishes
(e)
20-30-41, Finishing Material
(3)
Prepare the nose radome surface (Fig. 702).
(a)
Remove all lightning diverter strips from the nose radome.
(b)
Identify the lightning diverter strips for subsequent installation.
(c)
Clean the nose radome (Ref 53-52-0/701).
(d)
If there are surface defects, do the steps that follow: 1) Apply the static conditioner filler to the surface defects with your hand.
NOTE: Use the static conditioner filler to fill the small surface defects such as pinholes. Do not use this filler to smooth the surface. A continuous layer of this filler will cause an unsatisfactory paint bond.
2) Let the filler dry for 30 minutes at temperatures between 70 to 90°F, or until the filler becomes white.
3) Remove the remaining filler with a dry cheesecloth.
NOTE: Do not use solvents to remove the remaining filler. Solvents will remove the static conditioner on touch.
(e) If there are remaining surface defects that you cannot fill with the filler, use the 8-W-5 surfacer.
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500 Nose Radome - Cleaning and Painting
May 01/01 Figure 702 53-52-0
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(4)
Procedure - Mixing and Application Instructions (Table I)
(a)
Mix the base component.
(b)
Add the catalyst to the base component while you mix the solution.
(c)
Permit an induction time for the solution.
(d)
Add a thinner to the solution if it is necessary.
(e)
Apply the solution with the spray equipment.
NOTE: Obey the pot life of the paint as shown (Table I).
(f)
Let the paint dry before you apply the top layer (Table I).
(5)
Procedure - Apply Paint to the Nose Radome
(a)
Apply 0.8 mils of the antistatic paint (Black DeSoto BMS\10-21, Type II).
(b)
Install the lightning diverter strips on the nose radome.
(c)
Apply a vertical band of masking tape all around the radome from STA 138.6 to STA
(d)
If you use prestec enamel paint, do the step that follows:
1) Apply 4 mils of prestec enamel paint to the nose radome except the area between STA 138.6 to STA 143.6.
(e)
If you use BMS 10-60, Type II enamel, do the steps that follow: 1) Apply 0.3 to 0.8 mils of BMS 10-79, Type II, except the area between STA 138.6
TABLE I - APPLICATION CHART
MATERIAL MIX RATIO POT LIFE (HRS) SINGLE LAYER DRY FILM THICKNESS (MILS) DRY TIMES (70° - 90°F)
BMS 10-79
TYPE II
PRIMER
Base: 1 8 0.5 - 0.8 The minimum time before you
Catalyst: 1 apply tape is 2 hours. The
Thinner: none minimum time between layers is 2 hours. The maximum time before you can apply the top layer is 24 hours.
BMS 10-60
TYPE II
ENAMEL 4 1.4 - 1.8 The minimum time before you
Base: 822-T-203 Catalyst: 910-152 2 1 apply tape is 5 hrs at 90°F to 7 hours at 70°F. The minimum time before you can use the airplane is 48 hours. *[1]
Thinner: none *[1] The dry times decrease with increased temperatures.
500
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143.6.
to STA 143.6. 2) Apply 1 to 2 mils of BMS 10-60, Type II enamel, except the area between STA
138.6 to STA 143.6.
(f)
Remove the masking tape.
(g)
Apply second coat of 0.8 mils of the antistatic paint (Black DeSoto BMS 10-21, Type II) between STA 138.6 and STA 143.6 only. 1) Measure the surface resistance of the antistatic paint as follows:
a) Find 5 pairs of equidistant points in each quadrant of the antistatic paint band (20 total pairs).
b) Push the multimeter probes to each pair of the points on the antistatic
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