Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9, DC-9-80, and C-9 (military) series airplanes, and Model MD-88 airplanes. This proposal would require modification of certain non- regulating shutoff valves on the engine starter. This proposal is prompted by reports of uncontained failures of engine starters during flight and maintenance, which resulted from the application of excessive pressure on the engine starter that was associated with the installation of non-regulating shutoff valves on the starter. The actions specified by the proposed AD are intended to prevent such uncontained failures of the engine starters, which could create a fire hazard in the engine nacelle.