Summary
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This proposed AD was prompted by reports of chafing between the wire harness along the wing leading edge and the inboard end rib of the wing leading edge due to insufficient clearance. This proposed AD would require inspecting the wire harness along the leading edge for chafing damage, and repair if necessary; and relocating and installing new anchor nuts. We are proposing this AD to detect and correct chafing damage to the wire harness along the wing leading edge which, if not corrected, could lead to the loss of the airframe de-icing system, and could become a possible ignition source causing fire.