The caution appearing on the EICAS indicates what?

• A. Tail rotor bearing overheated
• B. Tail rotor hydraulic pressure low
• C. Main gearbox fault
• D. 1 or both of the tail rotor cable is broken or disconnected

Answer: (D)

The warning on EICAS signals a fault in the tail rotor control path. The tail rotor’s pitch is set by control cables that translate pilot input from the pedals into blade pitch. If one or both of these cables are broken or disconnected, the tail rotor won’t respond to pedal commands, causing loss of yaw control. That’s why this specific caution is used to alert crews to a broken or disconnected tail rotor cable, which is a critical systems fault that can lead to uncontrolled heading. Other issues like a bearing problem, hydraulic pressure loss, or a main gearbox fault involve different subsystems and would show separate indications, not this particular cable fault message.