This is a solicitation for the repair of three Receiver/Transmitter units, with a potential option for one additional repair within 365 days after award. The procurement is anticipated to be awarded on a sole-source basis to Telephonics Corporation, though all responsible sources may submit a quotation. The government will not provide drawings or specifications, and offerors must demonstrate the ability to obtain the necessary technical expertise, engineering data, and OEM parts from Telephonics Corp to perform the repairs. Quotations must have F.O.B. Destination or F.O.B. Origin shipping terms.