Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-90-30 series airplanes. This proposal would require repetitive inspections to detect debris in the areas behind the aft lavatory toilet shroud, behind the aft lavatory modules, and below the cabin floor aft of the aft cargo compartment bulkhead; and removal of debris. This proposal also would require modification of the lavatory toilet shroud assemblies and modification of the lavatory entry door louvers, which would terminate the repetitive inspections. This proposal is prompted by reports of paper debris collecting on the hot pneumatic ducts below the cabin floor. The actions specified by the proposed AD are intended to prevent paper debris from collecting on the ducts, which could result in a potential fire hazard or possible loss of elevator control system redundancy.