This is an unrestricted solicitation for the repair of six Indicator, AS ALT-NVIS units, with the potential to increase the quantity to ten units within 365 days after award. The contract will be awarded as a firm-fixed price purchase order on a sole source basis to the manufacturer, Aviation Avionics & Instrument Corp. No drawings, specifications, or schematics are available from the agency. The applicable NAICS code is 488190, with a small business size standard of $40,000,000.00. The location for performance of services is not specified.