Which caution appears to indicate a failure that affects both SAS 1 and SAS 2 or that hydraulic pressure is below minimum?

Which caution appears to indicate a failure that affects both SAS 1 and SAS 2 or that hydraulic pressure is below minimum?

• A. SAS OFF
• B. SAS DEGRADED
• C. HYD PRESS LOW
• D. SAS FAIL

Answer: (A)

SAS OFF is the warning that means the stabilator augmentation system is completely unavailable. On the UH-60S, SAS operates through two channels (SAS 1 and SAS 2) that use hydraulic pressure. When both channels have failed or when hydraulic pressure is below the minimum required, there is no SAS authority left to assist, so the system indicates SAS OFF. This makes it the best indicator that either both channels are out or the hydraulic supply to SAS is insufficient. SAS DEGRADED would mean one channel is still providing some assistance, not a total loss. HYD PRESS LOW flags insufficient hydraulic pressure but doesn’t by itself confirm that SAS is completely unavailable. SAS FAIL signals a failure within the SAS system, but it doesn’t necessarily specify that both channels are down or that hydraulic pressure is below minimum.

SAS OFF is the warning that means the stabilator augmentation system is completely unavailable. On the UH-60S, SAS operates through two channels (SAS 1 and SAS 2) that use hydraulic pressure. When both channels have failed or when hydraulic pressure is below the minimum required, there is no SAS authority left to assist, so the system indicates SAS OFF. This makes it the best indicator that either both channels are out or the hydraulic supply to SAS is insufficient.

SAS DEGRADED would mean one channel is still providing some assistance, not a total loss. HYD PRESS LOW flags insufficient hydraulic pressure but doesn’t by itself confirm that SAS is completely unavailable. SAS FAIL signals a failure within the SAS system, but it doesn’t necessarily specify that both channels are down or that hydraulic pressure is below minimum.