If a leak occurs in a pilot assist servo, which indication would not appear?

• A. Backup Pump On advisory
• B. Battery Low
• C. Hydraulic Pressure Low
• D. Cabin Altitude High

Answer: (A)

A leak in the pilot assist servo is a hydraulic fault that drops pressure in that servo’s circuit. The immediate cockpit indication you’d expect is Hydraulic Pressure Low for the affected system, signaling the loss of hydraulic force needed for that servo.

The backup pump on advisory wouldn’t automatically come on in this situation because the backup (electric) pump is activated to restore overall hydraulic pressure when the primary system can’t meet demands, not from a localized leak in a single servo. So you wouldn't see Backup Pump On just from a pilot assist servo leak.

Battery Low and Cabin Altitude High aren’t direct results of a servo leak: Battery Low points to an electrical power issue, and Cabin Altitude High relates to pressurization, which aren’t the immediate indicators of a localized hydraulic leak in the pilot assist servo.