28--SUPPORT,TURBINE COM

NSN 0R-2840-016997021-B8, REF NR 5142T69G01, QTY 57 EA, DELIVERY FOB ORIGIN. The design of this part is unstable. Engineering, manufacturing, or performance characteristics indicate that the required design objectives have not been achieved. Major changes are contemplated because the part has a low process yield or has demonstrated marginal performance during tests or service use. These changes will render the present part obsolete and unusable in its present configuration. Limited acquisition/repair from the present source is anticipated pending configuration changes. THIS IS A CRITICAL SAFETY ITEM (CSI).