Table 601/53-51-21-993-801 Panel Conductive Surface Maximum Resistance
Conductive Surface Type Maximum Resistance (Ohm)
*[1]
Anti-Static Coating 300,000
Aluminum Coated Fiber 10
Expanded Aluminum Foil
*[2]
0.5
Flamespray 0.5
*[1] Some panels will be installed with bonding jumpers. The dimension of the bonding jumper can change the maximum
resistance. Refer to the installation procedure for the maximum resistance of panels with bonding
jumpers(PAGEBLOCK 53-51-21/401).
*[2] Some panels with the expanded aluminum foil surface can have different maximum resistances. Refer to the
installation procedure for panels with different maximum resistances than in this table (PAGEBLOCK 53-51-21/401).
NOTE: The maximum resistance data for each panel can be found in the installation procedures
(PAGEBLOCK 53-51-21/401).
(a) If the designated electrical bond is not in the limits, then do these steps:
1) Apply a layer of coating on the countersunk area of the panel.
a) Use coating, C00767 on panels with an anti-static coating conductive surface
type.
b) Use Bonderite M-CR 600 Aero coating, C00862 on panels with an aluminum
conductive surface type.
2) Measure the maximum resistance again.
SUBTASK 53-51-21-400-008
(5) If the maximum resistance is in the limits, then make sure that the dimpled washer does not
move:
(a) Remove the probe.
(b) Install the fastener.
1) Refer to SWPM 20-20-00, Electrical Bonding of Fasteners To Conductive Finishes
on Composites.
H. Repeat the Electrical Resistance of the Designated Bonds Check
SUBTASK 53-51-21-200-003
(1) Do the “Check of the Electrical Resistance of the Designated Bonds” steps again until all
designated bonds are examined.
(a) Do the check with each subsequently installed designated bond fastener as the start
point until all fasteners are installed.
NOTE: It is not necessary to remove or do the resistance check again for the first
fastener installed.
1) If the designated electrical bond is not in the limits, then do these steps:
a) Apply a layer of coating on the countersunk area of the panel.
<1> Use coating, C00767 on panels with an anti-static coating conductive
surface type.
<2> Use Bonderite M-CR 600 Aero coating, C00862 on panels with an
aluminum conductive surface type.
b) Measure the maximum resistance for the fastener again.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-51-21
Page 603
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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