Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Aerospatiale Model ATR42 and ATR72 series airplanes. This proposal would require a one-time inspection of the electromagnetic interference (EMI) filter capacitors and electronic cards of the cabin air recirculation fans to detect damage. This proposal also would require replacement of damaged components with new or serviceable parts, and modification of the cabin air assembly fans. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent overheating and consequent failure of the EMI filter capacitors, which could result in emission of toxic smoke and fumes throughout the airplane, and consequent adverse effects on flight crew and passengers.