(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.
<1> Put the film resistance measure probe, SPL-10361, 1.00 ±0.25 in.
(25.40 ±6.35 mm) apart (Figure 709).
c) Record the value of the resistivity shown on the multimeter.
<1> The minimum allowable resistivity is 1 megohm per square.
<2> The maximum allowable resistivity is 100 megohm per square.
(d) To measure the surface resistance of the BMS10-21, Type II, or BMS10-21, Type IV,
using the Fastener-to-Fastener 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.
1) Make sure that the conductive coating shows in the fastener location.
2) Clean the area with alcohol, B50073.
3) Install one temporary fastener at each fastener location to be measured
(Figure 709).
NOTE: This procedure can be used for measuring electrical resistivity of panels
with covered (painted) conductive coatings when the ground fastener
locations show.
4) Connect the digital/analog multimeter, COM-1793, probes at the two fastener
locations (Figure 709).
5) Record the value of the resistivity with the digital/analog multimeter, COM-1793.
a) The minimum allowable resistivity is 1 megohm per square.
b) The maximum allowable resistivity is 100 megohm per square.
6) Remove the temporary fasteners from the surface.
SUBTASK 53-52-00-840-005
(3) Install the six lightning diverter strips (Install the Lightning Diverter Strip,
TASK 53-52-03-400-801).
SUBTASK 53-52-00-950-014
(4) Use Tape - Masking, G50509, or Scotch Brand No.471 tape, G02219, to mask-off the exterior
surface of the radome, except for a 5 in. (127 mm) vertical band from STA 138.6 to STA 143.6
(Figure 701).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-52-00
Page 711
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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