Forward Air Control Mission Suitability Case Study: Tactical and Airworthiness Evaluation of the LX7-135 Turboprop as a Commercial Derivative Aircraft
The modern multi-domain battlespace increasingly demands cost-effective, persistent platforms for Forward Air Control (Airborne) (FAC(A)) and Close Air Support (CAS) missions. While utilizing Commercial Derivative Aircraft (CDA) presents a viable alternative to high-maintenance military assets, the specific aerodynamic, ergonomic, and cognitive workload limitations encountered during the transition across the civil–military “airworthiness seam” remain a significantly underexplored gap in contemporary aerospace literature. To address this gap, a comprehensive empirical flight test campaign was executed on the LX7-135 turboprop to evaluate its tactical mission suitability. Employing the Cooper–Harper Handling Qualities Rating and Bedford Workload scales, and guided by military specifications (MIL-HDBK-516C, MIL-F-8785C), the study systematically assessed the aircraft’s pure performance, unaugmented flight dynamics, and human–machine interface during simulated combat scenarios, including dynamic 9-Line briefings and kinetic “Box Pattern” delivery profiles. Flight test data indicated 12 “SATISFACTORY” parameters, highlighting climb rates, extended endurance, and heavily damped short-period and Dutch roll modes optimal for target tracking. Conversely, the evaluation identified 4 “UNSATISFACTORY” and 10 “TOLERABLE” deficiencies—chiefly a single-door egress bottleneck, restricted stick clearance, degraded longitudinal static stability, and the absence of secure tactical communications. Although these constraints elevated pilot cognitive workload during multi-axis tasks, the LX7-135 demonstrates potential suitability for further development for the FAC(A) role, subject to the successful implementation and subsequent flight-test verification of the identified critical engineering modifications and specialized training syllabi.