For antenna bonding and grounding, electrical resistance tests should be conducted _____ applying a sealant.

Conducting electrical resistance tests prior to applying a sealant is critical to ensure that the bonding and grounding connections are effective and meet safety standards. When testing resistance before the installation of a sealant, you can accurately assess the electrical integrity of the bonding and grounding systems without the interference that sealants might introduce once they are applied.

Sealants can add a layer of insulation that can affect resistance readings. If tests are performed after the application of sealant, there could be a chance of misinterpretation of the connection quality due to changes in electrical status caused by the sealant material. This process ensures that any necessary corrections can be made in the bonding and grounding connections to avoid potential issues during operation.

Timely assessments are essential when installing critical systems like antennas, as effective grounding minimizes the risk of electrical interference or failure, which can be detrimental to avionics performance.