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system that requires periodiczonal inspection and cleaning.inspectionImplementation of the
recommendations, particularly those
would include
related to the rationale for an
inspecting
Enhanced Zonal Analysis Procedure,
for the
can potentially reduce the numberstructural of fire-related incidents and concerns nuisance circuit breaker trips. It
should also reduce the number of frustrating maintenance actions whereby replacing an electrical component returns a system to a serviceable state, but no fault is subsequently found with the removed electrical component when sent for repair or overhaul.
AIRCRAFT ZONES
Transport category aircraft can be defined by a common series of zones that can be used to assist in maintenance planning and work card production by specifying work areas and components. A zone can be defined by physical boundaries such as wing ribs, fuselage frames, control surfaces and areas accessible at access panels. Hence, a zonal inspection typically could entail a visual inspection for corrosion, missing/loose fasteners and other physical damage over an internal area of the fuselage defined as being between two adjacent frames [usually 20 inches apart] and between specified stringers. An "enhanced" zonal inspection (EZI) would include inspecting for the structural concerns just mentioned, but also include inspecting any system components such as wires and hydraulic lines in the same area, plus a cleaning task to remove any combustible material such
.  Ramon (Ray) Raoux, P. Eng.(ret)
as lint or chemical contaminants. The rationale for developing the EZI concept is that each wire or wire bundle or connector [i.e., wire system] in the zone is treated as a potential ignition source and the other contents of the zone are considered as being potentially combustible material [lint, spilled fluids, etc] or potentially contributing to combustion [fuel/oxygen/hot air lines].
WIRING CONCERNS
Perhaps the most important finding, which has been noticed by the various investigations under the auspices of ATSRAC, is the need to recognize wire systems as a system that requires periodic cleaning and inspection. Contaminants such as lint and grease are flammable and need to be removed to eliminate a potential combustion source. Swarf and metal filings can become lodged in a wire bundle and eventually cut or wear through the insulation; not only will the bare metal underneath be exposed and create a potential ignition source, but the conductive metallic residue can bridge the gap between the wire surface and an adjacent metal surface. The presence of any sticky fluids on the wire will help to ensure that these metallic residues do not fall-off the wire into a benign location. The rear side of circuit breaker panels are seldom accessed; yet they can accumulate a significant built-up of flammable lint.
Some of the following wiring concerns to inspect for, as the inspection portion of an EZI would include:
　
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