What does the STAB DEGRADED advisory mean?

What does the STAB DEGRADED advisory mean?

• A. Indicates The Stabilator Control Has Reverted To A Condition Due To Reduced Functionality
• B. Indicates The Stabilator Is Jammed
• C. Indicates The Stabilator Is In Manual Mode
• D. Indicates The Stabilator Has Failed Mechanically

Answer: (A)

Stabilator control is the mechanism that adjusts the nose pitch of the helicopter for trim and pitch control. When the STAB DEGRADED advisory appears, it means the stabilator system has detected reduced functionality and has automatically reverted to a degraded condition. In this mode the stabilator still works, but with limited authority and predictability, so pitch control won’t be as full or precise as normal. This isn’t the same as a jam or a total mechanical failure. A jam would show a different indication and typically a loss of normal movement, and a full mechanical failure would trigger a different advisory or fault state. It’s also not simply manual mode; the degraded state is about reduced automatic functionality, not a switch to manual control by pilot input. So, the best interpretation is that the stabilator control has degraded and authority is reduced, requiring the pilot to anticipate altered pitch response and monitor the situation closely.

Stabilator control is the mechanism that adjusts the nose pitch of the helicopter for trim and pitch control. When the STAB DEGRADED advisory appears, it means the stabilator system has detected reduced functionality and has automatically reverted to a degraded condition. In this mode the stabilator still works, but with limited authority and predictability, so pitch control won’t be as full or precise as normal.

This isn’t the same as a jam or a total mechanical failure. A jam would show a different indication and typically a loss of normal movement, and a full mechanical failure would trigger a different advisory or fault state. It’s also not simply manual mode; the degraded state is about reduced automatic functionality, not a switch to manual control by pilot input.

So, the best interpretation is that the stabilator control has degraded and authority is reduced, requiring the pilot to anticipate altered pitch response and monitor the situation closely.