Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

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This document revises an earlier proposed airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, that would have required performing repetitive inspections of the electrical harnesses of the spoiler and the brake pressure sensor unit on both sides of the wing root to detect any chafing or wire damage, and repairing or replacing any damaged or chafed harness or wire with a new harness, as applicable. This new action revises the proposed rule by expanding the applicability to include additional airplanes, deleting the repetitive inspections, and by adding a terminating modification for the one-time inspection. The actions specified by this new proposed AD are intended to detect and correct chafing of the electrical cables of the spoiler and brake pressure sensor unit on both sides of the wing root, which could result in loss of flight control system and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.