For reports of structural units and associated components and members which furnish a means of mounting and housing the powerplant or rotor assembly. Includes the structure of powerplant cowling inclusive of the structural portion of the inlet whether or not integral with the aircraft. Structural portions of the exhaust system are excluded where they are not integral with the airframe. Use this code when there is insufficient information to file in a more specific JASC 5400 series code. NOTE: The use of this code should be avoided if possible as a reported defect is not likely to involve both pylon and nacelle.