During aggressive maneuvers, which indicator combination may accompany the LIMIT light and SERVO LIMIT caution on the EICAS page?

During aggressive maneuvers, which indicator combination may accompany the LIMIT light and SERVO LIMIT caution on the EICAS page?

• A. Momentary locking of the flight controls
• B. Servo jam indication
• C. Loss of hydraulic pressure
• D. SEC HYD HI Pres illumination

Answer: (A)

During very aggressive maneuvers, the flight-control servos can reach their travel limits. The system then activates a protective measure that momentarily locks the flight controls to prevent over-travel and damage. The LIMIT light together with the SERVO LIMIT caution signals exactly this condition—the servos are at or near their travel limit and the controls may lock briefly as load is reduced. This is the most consistent explanation for seeing both indicators in that scenario, because they point to a limit condition on the servos rather than a persistent fault. This differs from a servo jam, which would indicate a mechanical obstruction or failure in a specific servo and would present with a jam indication rather than a short-lived lock tied to control travel limits. Loss of hydraulic pressure would degrade surface authority and trigger other warnings related to hydraulic quantities, not specifically a limit of servo travel. A SEC HYD HI Pres illumination relates to abnormally high pressure in the secondary hydraulic system, which is a different fault condition altogether.

During very aggressive maneuvers, the flight-control servos can reach their travel limits. The system then activates a protective measure that momentarily locks the flight controls to prevent over-travel and damage. The LIMIT light together with the SERVO LIMIT caution signals exactly this condition—the servos are at or near their travel limit and the controls may lock briefly as load is reduced. This is the most consistent explanation for seeing both indicators in that scenario, because they point to a limit condition on the servos rather than a persistent fault.

This differs from a servo jam, which would indicate a mechanical obstruction or failure in a specific servo and would present with a jam indication rather than a short-lived lock tied to control travel limits. Loss of hydraulic pressure would degrade surface authority and trigger other warnings related to hydraulic quantities, not specifically a limit of servo travel. A SEC HYD HI Pres illumination relates to abnormally high pressure in the secondary hydraulic system, which is a different fault condition altogether.