Department/Segment Overview: Mechanical Systems, Externals, & Nacelles (MSEN): The MSEN organization is responsible for the design, development, and in-service support of power transmission systems, bearing compartment and rotor support design and analysis, oil and thermal management systems, engine externals packaging and architecture, as well as nacelles for commercial and military engine models. Collaborate with customers, System Integrated Product Teams (SIPTs), Integrated Program Management Teams (IPMTs), senior management, suppliers, and cross-functional organizations; provide technical support for engine validation builds and testing.