Which condition triggers the SERVO JAM warning on the EICAS page?

Which condition triggers the SERVO JAM warning on the EICAS page?

• A. Loss of hydraulic pressure to either system or a jammed rotor distributor valve on any main or tail flight control servos
• B. Engine fire
• C. Low hydraulic fluid level
• D. Electrical fault in the flight control computer

Answer: (A)

The SERVO JAM warning shows up when the flight control servos lose hydraulic pressure or when the rotor distributor valve that feeds those servos becomes jammed. In the MH-65E the flight controls are powered by hydraulic servos that move the swashplate and control surfaces; if pressure to any main or tail servo is lost, or if the distributor valve is jammed, the servos can’t respond to pilot input, and the EICAS alerts the crew with a servo jam indication. This isn’t triggered by an engine fire or simply by a low hydraulic fluid level in isolation. A fire warning is a different fault condition, and while low fluid can lead to pressure loss, the alert specifically pinpoints a servo jam condition caused by loss of hydraulic pressure or a jammed distributor valve. An electrical fault in the flight control computer would present its own warning set, not servo jam.

The SERVO JAM warning shows up when the flight control servos lose hydraulic pressure or when the rotor distributor valve that feeds those servos becomes jammed. In the MH-65E the flight controls are powered by hydraulic servos that move the swashplate and control surfaces; if pressure to any main or tail servo is lost, or if the distributor valve is jammed, the servos can’t respond to pilot input, and the EICAS alerts the crew with a servo jam indication.

This isn’t triggered by an engine fire or simply by a low hydraulic fluid level in isolation. A fire warning is a different fault condition, and while low fluid can lead to pressure loss, the alert specifically pinpoints a servo jam condition caused by loss of hydraulic pressure or a jammed distributor valve. An electrical fault in the flight control computer would present its own warning set, not servo jam.