SUBTASK 53-52-00-370-038
(5) Apply a second coat of coating, C00841, or coating, C50219, to the exposed vertical band
area (Figure 705).
(a) To apply coating, C00841, do this task: Apply BMS 10-21 Type II Conductive Coating To
Specified External Surfaces, TASK 51-21-71-370-802.
(b) To apply coating, C50219, do this task: Apply BMS 10-21 Type IV Conductive Coating To
Specified External Surfaces, TASK 51-21-71-370-803.
(c) If the anti-static coating is not overcoated within 24 hours do the following:
1) Solvent clean using alcohol, B50073.
2) Lightly abrade with very fine abrasive pad, Scotch-Brite 7447 pad, G50220.
3) Solvent clean using alcohol, B50073.
4) If necessary, use a tack rag, G50123, to remove particulate contamination.
5) Visually examine the anti-static coating surface to make sure that the coating is
continuous (no bare areas).
SUBTASK 53-52-00-860-016
(6) Measure the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV, using one of
the following methods:
(a) To measure the surface resistance using the square method, do the steps that follow:
1) Cut two pieces of flexible bare 3M 1181 copper foil tape, G50630, with conductive
adhesive each of length “L” (Figure 706).
2) Place the two pieces of tape at a distance of “0.1L ± 5 percent” and parallel to each
other (Figure 706).
3) Press the two pieces of tape firmly against the anti-static coating.
4) Connect the Ohmmeter probes to the tape (Figure 706).
5) Read the number for resistance.
6) Multiply the number for resistance by 10.
NOTE: The result is the resistivity of the anti-static coating.
7) Make sure that the resistance is between 1 and 100 megohms.
a) If the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV is
less than 1 megohm per square (square of any dimension), do the steps that
follow (refer to the relevant section within this task):
<1> Remove the BMS10-21, Type II or Type IV, anti-static paint.
<2> Clean and prepare the surface.
<3> Re-apply the BMS10-21, Type II or Type IV, anti-static paint.
<4> Measure the resistance again.
<5> Repeat once if necessary.
<a> Contact Liaison engineering if resistivity requirements are not
met after second processing.
b) If the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV is
more than 100 megohms, do the steps that follow:
<1> Cure at 140°F (60°C) to 160°F (71°C) for 60 to 70 minutes.
<2> Measure the resistance again.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-52-00
Page 712
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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