1. HISTECis afive year program sponsored by NASA Lewis Research Center inCleveland, Ohio. Program partners include NASA Dryden Flight Research Center, which accomplished theflight demonstration;Pratt & Whitney, which developed the technical concepts and the systems for flight demonstration;Boeing (formerly McDonnell Douglas), which helped integrate the HISTECsystems onto the flight test vehicle; and the U.S. AirForce, which provided flight systems, engines, and theaircraft assets. The HISTEC program consists of three phases: PhaseI-Algorithm Development, Phase II -Concept Validation and System Development, andPhaseIII -Engine/Flight Demonstration. A timeline for the program is shown in Figure 3. HISTECPhase I "Algorithm Development", completed in 1994, successfully defined the requirements for, and designed the algorithms necessary for theDistortion Estimation System (DES).12Under Phase IIA- "Concept Validation", the integrated DES algorithms and distortion accommodation algorithms (High Stability Control Laws) weredesigned and validated. This integration testing used adetailed nonlinear aero-thermal transient model of the F100-PW-229engine and an emulator of the F-15 aircraft inlet which estimates engine inlet pressures based on aircraft flight condition, angle-of-attack, and angle-ofsideslip. The simulation testing confirmed that the HISTEC system should be able to sense inlet distortion, determine theeffect on engine stability, and accommodate for distortion by maintaining adequate
2. This paper provides a summary of HISTEC Phase lib - Systems Development, and PhaseIII -Engine/Flight Demonstration. During these final phases of the HISTEC program, the systems necessary to flight demonstrate theHISTEC approach were developed and validated through systems testing and ground engine test. The systems were installed on theF-15Advanced Control Technology for Integrated Vehicles (ACTIVE) aircraft at NASA Dryden and theHISTEC flight demonstration was accomplished inthe summer of 1997. In this paper, the background and objectives for the flight demonstration are given. The HISTEC flight systems hardware and software are described and the efforts necessary to validate thesesystems are discussed. An overview of the flight test planning is given. Finally, asummary of the flight testing and flight test results is provided. In companion papers, the details of the effort necessary to install anddemonstrate the HISTEC systems are given,14and thedetailed flight test results arepresented .1S
3. -3S«.OSS2Z9MTV :ARP1420 Xitall Margin Loss due to Distortion -•DESFPiiR :OES %Stall Margin ton due to Distortion Flight 1775 DP19, 20, 36, 23, 24 at 20K/0.6, Mil