An adaptive inertial particle separation system having an active configuration and a passive configuration, the system comprising: an air-intake duct including: an outer wall spaced apart from a central axis (CL); an inner wall located between the outer wall and the central axis (CL); an intake passage defined in part by the inner wall and the outer wall ; a splitter located between the outer wall and the inner wall and including an outer splitter surface and an inner splitter surface , the inner splitter surface and the inner wall defining a compressor passage having a first area in the active configuration and a second area in the passive configuration, and the outer splitter surface and outer wall defining a scavenge passage in the active configuration; a sensor operatively connected to the air-intake duct , the sensor being configured to measure a particulate level with respect to the intake passage and initiate at least one of the active configuration and passive configuration based in part on the particulate level; and an actuator ; characterized in that the actuator is configured to move the outer wall and the inner wall relative to the splitter while the splitter substantially maintains a position, such that an intake flow is directed into the scavenge passage in the active configuration and bypasses the scavenge passage in the passive configuration. an air-intake duct including: an outer wall spaced apart from a central axis (CL); an inner wall located between the outer wall and the central axis (CL); an intake passage defined in part by the inner wall and the outer wall ; a splitter located between the outer wall and the inner wall and including an outer splitter surface and an inner splitter surface , the inner splitter surface and the inner wall defining a compressor passage having a first area in the active configuration and a second area in the passive configuration, and the outer splitter surface and outer wall defining a scavenge passage in the active configuration; an outer wall spaced apart from a central axis (CL); an inner wall located between the outer wall and the central axis (CL); an intake passage defined in part by the inner wall and the outer wall ; a splitter located between the outer wall and the inner wall and including an outer splitter surface and an inner splitter surface , the inner splitter surface and the inner wall defining a compressor passage having a first area in the active configuration and a second area in the passive configuration, and the outer splitter surface and outer wall defining a scavenge passage in the active configuration; a sensor operatively connected to the air-intake duct , the sensor being configured to measure a particulate level with respect to the intake passage and initiate at least one of the active configuration and passive configuration based in part on the particulate level; and an actuator ; characterized in that the actuator is configured to move the outer wall and the inner wall relative to the splitter while the splitter substantially maintains a position, such that an intake flow is directed into the scavenge passage in the active configuration and bypasses the scavenge passage in the passive configuration. <EOS>