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A
Yes. Although it is not mandatory, SAS and ATT should be active at the same time to achieve as smooth a flight as possible.
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B
No. SAS and ATT are mutually exclusive modes. Selecting one deactivates the other.
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C
Yes. It is impossible to activate the ATT mode without switching on the SAS mode first.
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D
No. SAS and ATT are mutually exclusive modes. Selecting both at the same time causes the 'AFCS FAIL' annunciator light to illuminate.
Refer to figure.
The SAS (Stability Augmentation System) and ATT (Attitude Hold) modes of an AFCS (Automatic Flight Control System) cannot be active at the same time.
The SAS is a system designed to stabilise the aircraft by making small corrections to the control surfaces in response to any movement or disturbance in the helicopter's pitch, roll and yaw axis.
On the other hand, the ATT mode which constitutes an AFCS mode, maintains the aircraft's attitude by holding a specific pitch, roll angle that has been set by the pilot. This mode is typically used during flight to relieve the pilot from having to continuously adjust the controls.
While the SAS mode and ATT mode perform similar functions, they operate differently and are not designed to be active at the same time. If both modes were active simultaneously, they would work against each other and cause the aircraft to behave unpredictably.
Therefore, SAS and ATT are mutually exclusive modes. Selecting one deactivates the other.
Notes:
- Attitude (ATT) mode is a commonly used mode in Automatic Flight Control Systems (AFCS)
- The Automatic Stabilisation Equipment (ASE) provides the necessary automatic control inputs to the AFCS for maintaining a stable attitude in the aircraft during normal flight operations, reducing the workload on the pilot.
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