ICA

Instructions for Continued Airworthiness

The set of documents an aircraft manufacturer or STC holder provides to the operator that defines the inspections, maintenance actions, and intervals needed to keep the aircraft airworthy through its service life. EWIS items belong in the ICA.

Technical detail

Where 25.1707 compliance depends on a physical feature — a clamp marker, a protective shroud, a bonding strap — the inspection of that feature must be carried in the ICA. Compliance is not complete until the feature is in a maintenance program that will catch its degradation or removal.

ICA items derived from §25.1707 work feed the Enhanced Zonal Analysis Program (EZAP), which is the maintenance-program structure for zone-by-zone EWIS inspection.

When it matters

Every §25.1707 compliance argument that relies on a physical maintenance-visible feature must close the loop in the ICA.

Related terms

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.
Enhanced Zonal Analysis Program
A maintenance-program structure that drives zone-by-zone inspection of EWIS, used to ensure that age-related EWIS issues are surfaced before they create hazardous conditions.
Critical Clamp Marker
A visual indicator applied to an EWIS harness — typically a 50/50 marker split on each side of a clamp — that tells maintenance technicians where a clamp belongs, so a harness that shifts during access work can be returned to its designed location.