Stability Augmentation Systems (SAS) | Difference in SAS & Autopilot

Stability Augmentation Systems (SAS) | Difference in SAS & Autopilot

Stability Augmentation Systems (SAS) | Difference between SAS & Autopilot

Stability Augmentation Systems (SAS)

Stability augmentation systems (SAS) are used in some helicopters to help stabilize the helicopter when in flight or hovering. A force trim system, for example, uses a magnetic clutch and springs to keep the cycle control at the position where it was released. Electric actuators provide input to hydraulic servos in more complex systems. These servos are controlled by a computer that detects the helicopter's attitude. Other information, including as heading, speed, altitude, and navigation, can be fed into the computer to create a comprehensive autopilot system. The SAS mode provides short-term attitude and attitude rate stabilization for use in hands-on flying. Because it stabilizes the helicopter against external disturbances and augments or enhances pilot input, it's called a stability augmentation system. The pilot has the ability to override or detach the SAS at any time. By increasing basic aircraft control harmony and reducing disruptions, SAS minimizes pilot workload. When the pilot is required to conduct other tasks, such as sling loading and search and rescue missions, these technologies come in handy.

Difference Between Stability Augmentation Systems (SAS) & Autopilot


A Stability Augmentation System (SAS) is an inertially stabilized platform that maintains an Aero plane or helicopter's altitude and heading in a fixed position. Originally conceived as an SAS for helicopters to relieve pilot fatigue when hovering for an extended amount of time.


Many of the same functions as an SAS-equipped aircraft will be performed by autopilots. Autopilot in helicopters would function similarly to SAS. However, autopilot has a number of other features, like altitude hold. Hold your airspeed. Tracking the VOR (Localizer approaches) ILS techniques that are linked. Point-to-point navigation, "R" navigation capabilities, Flight Management Systems. Autopilots have grown in sophistication over time, and will continue to do so as aeronautical and navigation engineers enhance their products.

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