Contracts Group, Bldg 588, Mail Stop 32, Naval Air Warfare Center Aircraft Division, Patuxent River, MD 20670-5304

J -- MAINTENANCE, REPAIR & REBUILDING OF EQUIPMENT SOL N00421-97-R-1468 POC John R. Tomechko, Contract Specialist (301) 342-1825 ext. 142 E-MAIL: John Tomechko's e-mail address, tomechko_john%pax9b@mr.nawcad.navy.mil. The Metric and TSPI Systems Division of the Naval Air Warfare Center Aircraft Division (NAWC-AD), Patuxent River, MD, measures the radar cross section (RCS) of military and civilian aircraft. Multiple measurements are taken simultaneously, using eleven (11) pedestals located at Building 1406 at the Patuxent River Naval Base. NAWC-AD requires the "improved" refurbishment and upgrade of one Scientific-Atlanta (SA) 3106 pedestal and the "standard" refurbishment of four pedestals of either the model SA-3106 or model SA-3204 variety. The contractor shall perform the following improvement and modernization tasks on each of the 5 pedestals covered by the terms of this contract: i) Replace existing motors with new DC permanent magnet motors with integral tachometers; ii) Replace existing silicon control rectifier power control units with new pulse width modulated units in both the azimuth (AZ) and elevation (EL) axes; iii) Completely disassemble, sandblast, prime and paint each pedestal for outdoor application; iv) Perform complete acceptance test procedures (ATP) at government facility to original SA-3106 or SA-3204 specifications, plus any additional pointing accuracy requirements (i.e. encoder option); v) Provide a Local Control Unit (LCU) necessary for ease of maintenance; vi) provide a written pointing error test procedure. The contractor shall measure and document the static and dynamic pointing error upon completion of the refurbishment; vii) the contractor shall also perform two sets of ATPs. The first ATP will take place at the contractor's facility before return shipment to NAWCAD. The second ATP will take place at NAWCAD after the government reinstalls the pedestals. The contractor's ATP (at both sites) shall contain procedures for measurements including but not limited to verifying the following modes of pedestal controller operation: standby, slew, manual, slave, stow, remote. In addition to the manual pedestal controller modes, the contractor shall verify, during testing at NAWCAD, modes indicated via IEEE-488 interface using Metric and TSPI's Multiple Antenna Position System (MAPS). The MAPS outputs digital data commands compatible with the Scientific Atlanta SA-3840 controller. After reinstallation by government personnel, the contractor shall perform any adjustment necessary to balance, calibrate (e.g., servo compensation), level (within 0.1 millimeter of the vertical), and align the pedestal. The contractor shall make all adjustments with the pedestal's full operational payload and configuration and shall provide all necessary test equipment and tools. During the testing at NAWCAD, the contractor shall use the government's operational payload (e.g., reflector, cabinets, RF equipment, counter weights, etc.) installed on the pedestal. The contractor shall complete the upgrade, both sets of tests, and alignment/calibration of each pedestal within 56 days (i.e., 8 weeks) from the time the pedestal is shipped from the government facility. The contractor shall replace the existing synchro assemblies in both axes with new 19-bit encoders (AZ and EL) to improve the data take-off or pointing accuracy to +/- 0.005 degrees and the RMS pointing accuracy to +/- 0.004 degrees. The contractor shall replace the existing tracking controller (SA-3840) with a new tracking controller compatible with the new encoders and 100% compatible (including IEEE-488 interface and remote control commands) with the existing SA-3840 controller. If interested parties are capable of providing a pedestal refurbishing service that meets all of the above minimum requirements, please contact John Tomechko (25521Q) in writing at Contracts, Bldg. 588, Suite 2, Naval Air Warfare Center-Aircraft Division, 47253 Whalen Road, Unit 588, Patuxent River, MD 20670-1463 by 21 November 1997. Correspondence may be faxed to Mr. Tomechko at (301) 342-1864. For questions regarding this action, contact John Tomechko at (301)342-1825 ext. 142. (0310)

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