Which system is responsible for short-term stabilization in a helicopter?

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The correct answer is SAS, which stands for Stability Augmentation System. This system plays a crucial role in short-term stabilization of the helicopter by enhancing its inherent stability characteristics. The SAS actively compensates for disturbances caused by external factors such as wind gusts or pilot inputs. By making rapid adjustments to control surfaces, the SAS helps maintain a steady attitude, improving the pilot's control and reducing workload.

In the context of the other options, attitude hold generally refers to a system that maintains the helicopter's orientation but may not actively address sudden disturbances. Longitudinal stabilization focuses primarily on forward and backward movements and may not encompass the full range of stabilization needed for lateral or vertical adjustments. The AFCS (Automatic Flight Control System) outer loop is typically more concerned with broader flight path management rather than short-term stability adjustments, which are critical for immediate pilot control in response to changing flight conditions.