3) It is necessary to examine all the fastener holes to identify locations with an
electrical bond.
(c) Examine the countersunk area of the fastener hole:
NOTE: The countersunk area of the panel will be below the dimpled washer, if installed.
1) The countersunk area for each electrically bonded fastener hole will have a coating,
C00767 or an Bonderite M-CR 600 Aero coating, C00862.
NOTE: Non-electrical bonding locations do not have coatings in the countersunk
hole.
(d) Examine the countersunk mating surface between the dimpled washer (if installed) and
the panel (Figure 601).
1) Make sure that the surfaces without an electrical bond between the dimpled washer
and the panel are free from contamination.
2) Make sure that the surfaces with an electrical bond between the dimpled washer
and the panel are free from contamination, primer, or paint.
(e) If necessary, install the fastener if the location is not a designated electrical bond.
NOTE: It is not necessary to do this step if the removal and installation procedure is
being done until it is necessary in the installation procedure.
1) Do not install the dimpled washer if the location is not a designated electrical bond.
(f) Do the steps again to find all the designated bond locations.
NOTE: The only fasteners not installed will be fasteners for a designated electrical bond.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-51-21
Page 607
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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