If the backup hydraulic pump fails to come on when the #2 hydraulic system fails, which caution illuminates?

If the backup hydraulic pump fails to come on when the #2 hydraulic system fails, which caution illuminates?

• A. HYD PUMP 2 FAIL
• B. PRI SERVO 2 FAIL
• C. BOOST SERVO OFF
• D. SAS OFF

Answer: (A)

The situation tests how the hydraulic backup pump status is signaled when a hydraulic system loses pressure. The backup pump for system 2 is designed to start automatically to keep that system pressurized. If system 2 fails and the backup pump does not come on, the HYD PUMP 2 FAIL caution lights up to warn you that the backup pump did not engage as required. This cue directly points to a problem with the backup pump for the #2 hydraulic circuit, which is exactly what the scenario describes. Other cautions relate to different components—primary servo 2, boost servo, or SAS—so they wouldn’t illuminate due to a backup pump not coming on.

The situation tests how the hydraulic backup pump status is signaled when a hydraulic system loses pressure. The backup pump for system 2 is designed to start automatically to keep that system pressurized. If system 2 fails and the backup pump does not come on, the HYD PUMP 2 FAIL caution lights up to warn you that the backup pump did not engage as required. This cue directly points to a problem with the backup pump for the #2 hydraulic circuit, which is exactly what the scenario describes. Other cautions relate to different components—primary servo 2, boost servo, or SAS—so they wouldn’t illuminate due to a backup pump not coming on.