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Gulfstream IV Returns to Lincoln Laboratory After Extensive Modernization

MIT Lincoln Laboratory's Gulfstream IV (G-IV) research aircraft has returned home after a seven-year, extensive modification process in Canada. This project, the largest and most complex airborne test bed modernization in the laboratory's history, transforms the jet into a specialized platform for the U.S. Air Force's Air Vehicle Survivability Evaluation (AVSE) program.

The G-IV will support the AVSE program, which assesses how U.S. aircraft and space assets perform against current and emerging threats. The laboratory previously used a modified Gulfstream II (G-II) for this program since the early 1990s but began seeking a replacement in 2013 due to parts availability issues. The G-IV was chosen for its superior performance, range, sustainability, and cost-effectiveness.

To ensure long-term operational capability, all anticipated modifications were completed at once. The Toronto-based company Field Aviation was selected for the work. However, the project timeline was extended due to COVID-19 disruptions and contractor changes. Lincoln Laboratory then took over direct oversight of modifications, maintenance, and reassembly, with staff making frequent trips to Canada and working to secure necessary permits.

The modernization involved overhauling the aircraft's structure, including adding four wing pylons and a fifth pylon on the lower fuselage to carry external sensor pods weighing up to 1,000 and 2,000 pounds, respectively. The wings and fuselage were reinforced to handle the added weight and stress. The nose and tail were extended with standardized interfaces for rapid sensor placement, and the interior was outfitted with equipment racks, operator workstations, extensive cabling, and cooling systems.

A new, more powerful auxiliary power unit (APU) was installed in a fireproof titanium enclosure to generate sufficient electrical power for the test systems in flight. The original APU was insufficient for the mission requirements. The laboratory's Engineering Division validated the APU's performance through simulations.

Following reassembly, the aircraft underwent numerous operational checks and completed multiple post-modification flights without any maintenance issues, a rare achievement for such a complex modification. Test pilots are currently evaluating its airworthiness. The G-IV is expected to be fully mission-qualified for the AVSE program in approximately 18 months, after completing further flight testing, systems modification, test system installation, and FAA certification.

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