GFC 600 AFCS Part 23 AML STC Maintenance Manual Page 8
190-01938-00 Revision 13
2.4 Electrical Bonding
For the purposes of this STC, aircraft ground reference definitions vary according to airframe
type as defined in Table 2-2. Refer to the periodic test and reconditioned resistance values
corresponding to these ground reference definitions when performing the equipment bonding
tests in Section 4.5.
The periodic test value is the value allowed during the bonding checks specified in Section 4.5.
The reconditioned value is the value allowed on initial installation or if the bond must be
reworked if the periodic test value is exceeded.
Refer to SAE ARP 1870 Section 5 when surface preparation is required to achieve electrical
bond.
Table 2-2 – Electrical Bonding
Maximum Resistance Between GFC
600 Equipment Chassis and Ground
Reference (mΩ)
Nearby metal structure for
servos
Instrument panel for GMC
605 and GI 285
2.4.1 Consideration for Untreated or Bare Dissimilar Metals
The correct material finish is important when mating untreated or bare dissimilar metals.
Materials should be galvanically compatible. When corrosion protection is removed to make an
electrical bond any exposed area after the bond is completed should be protected again.
Additional guidance can be found in AC 43.13-1B and SAE ARP 1870. Typical electrical
bonding preparation examples are shown in Figure 2-3, Figure 2-4, and Figure 2-5.
Figure 2-3 – Electrical Bonding Preparation – Nut Plate
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