Which statement best describes the relationship between loss of hydraulic pressure and the SERVO JAM warning?

Which statement best describes the relationship between loss of hydraulic pressure and the SERVO JAM warning?

• A. SERVO JAM indicates hydraulic pressure loss to any system or jammed rotor distributor valve
• B. SERVO JAM only occurs with electrical fault
• C. SERVO JAM is unrelated to hydraulic system status
• D. SERVO JAM indicates power supply issue, not hydraulics

Answer: (A)

The SERVO JAM warning is tied directly to the hydraulic control system that actuates the flight controls. The servos rely on hydraulic pressure to move the control surfaces. If hydraulic pressure is lost to any servo circuit, the actuators can’t respond as commanded, and the system flags a SERVO JAM. Likewise, if the rotor distributor valve that routes hydraulic fluid to the servos becomes jammed, fluid can’t reach the servos properly, producing the same warning. In both cases the issue is with the hydraulic path or a blockage, not with electrical wiring or a power supply alone. So this warning specifically signals a hydraulic-side fault affecting servo operation.

The SERVO JAM warning is tied directly to the hydraulic control system that actuates the flight controls. The servos rely on hydraulic pressure to move the control surfaces. If hydraulic pressure is lost to any servo circuit, the actuators can’t respond as commanded, and the system flags a SERVO JAM. Likewise, if the rotor distributor valve that routes hydraulic fluid to the servos becomes jammed, fluid can’t reach the servos properly, producing the same warning. In both cases the issue is with the hydraulic path or a blockage, not with electrical wiring or a power supply alone. So this warning specifically signals a hydraulic-side fault affecting servo operation.