SAE ARP1870A — Aerospace Electrical Bonding and Grounding

The SAE aerospace recommended practice covering electrical bonding and grounding of aerospace systems for electromagnetic compatibility and safety. Latest revision 2012.

Technical detail

ARP1870A defines bonding classes, grounding practices, joint preparation, and verification methods for aerospace electrical bonds. Used in conjunction with AS50881 to substantiate the grounding and bonding requirements of FAA §25.1707(d).

Important reference for ground termination separation decisions and for assessing static-discharge and lightning current paths under FAA §25.1707(b) and (d).

When it matters

Any cert work that touches independent power source separation, static-ground location, lightning current path, or electrical bonding for EMC.

Related terms

SAE AS50881 — Wiring Aerospace Vehicle

The SAE aerospace standard that establishes recommended practice for the design, installation, and verification of aerospace wiring systems. Widely referenced as supporting guidance for FAA §25.1707 compliance.

FAA 25.1707 — System Separation Requirements

The Federal Aviation Regulation that requires EWIS to be physically separated and electrically isolated from other EWIS, aircraft systems, fluid lines, control cables, and heated equipment such that no credible failure can produce a hazardous condition.