12. Alteration

The program to enhance EWIS maintenance also applies to EWIS installed, modified, or affected by operator alterations or STCs. Alterations that could affect EWIS include, but are not limited to, those that install new equipment in close proximity to wiring, introduce a heat source in the zone, or introduce potential sources of combustible material or harmful contamination into the zone.

The operator is responsible for determining if the EWIS has been altered (or affected by alteration) and enhancing the maintenance program as appropriate.