<3> If the resistance is not between 1 and 100 megohms repeat the
resolution steps.
8) Remove copper tape after completion of the measurement.
(b) To measure the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV,
using a surface resistivity measurement probe, SPL-7885, do the steps that follow:
1) Connect the digital/analog multimeter, COM-1793, to the surface resistivity
measurement probe, SPL-7885 (Figure 707).
2) Place surface resistivity measurement probe, SPL-7885, on the conductive coating.
3) Read the number for the resistance.
4) Multiply the number for resistance by 10.
NOTE: The result is the resistivity of the anti-static coating.
5) 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.
<3> If the resistance is not between 1 and 100 megohms repeat the
resolution steps.
(c) To measure the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV,
using the Fastener-to-Conductive Surface Test Method, do the steps that follow:
NOTE: The resistivity of the conductive coating after it is cured must be between 1 and
100 megohms per square.
NOTE: Let the conductive coat cure for the specified time before you measure the
conductivity (Figure 708).
1) If the bonding surface and the head of the fastener are covered with a finish, do the
steps as follows (Figure 709):
a) Remove a sufficient quantity of the outer coating or paint to let the probes
touch the conductive finish.
NOTE: If it is necessary, the probes can be pushed through the outer coating.
b) Put the digital/analog multimeter, COM-1793, with the film resistance measure
probe, SPL-10361 in direct contact with the bonding fastener and the
conductive finish.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-52-00
Page 713
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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