This is a Market Survey to locate potential source for repair and production of the AN/ASN-157 Doppler Navigation Set (DNS), NSN: 6605-01-323-9061, P/N P510A003-02. These items were produced sole source by BAE Systems, Wayne, New Jersey, CAGE 0D0D0.  Detailed technical data for this item is not available from the Army. Any sources capable of perform the required tasks must so indicate, by writing to US Army Combat Capabilities Development Command (DEVCOM), C5ISR Center’s Product Realization Systems Engineering and Quality Directorate (PRSE&Q), ATTN: RDER-PRA-AB(LOUIE), Building 6007, 3rd Floor, F3-140-090, Aberdeen Proving Ground, MD 21005. Companies must demonstrate that they had past experience of produce and repair these items. The lead time requirement for repair these items is 6 months from the Date of the Contract. The response must demonstrate intimate knowledge of the system including areas such as system design, interface requirements, test and fault isolation, product acceptance processes, projected parts/materials usage and the necessary special test equipment. The response must also demonstrate that the finished products will be able to obtain Airworthiness certification. Successful supplier is require to warrant that the item will satisfactorily perform when used for the purpose intended by the Army. For more information contact Wai Louie, (443)395-1267, Email Address: [email protected].  The deadline for response is July 16, 2021.