Which statement correctly distinguishes A/S limits for Hydraulic System INOP under VMC vs IMC?

Which statement correctly distinguishes A/S limits for Hydraulic System INOP under VMC vs IMC?

• A. 150 KIAS VMC; 140 KIAS IMC
• B. 170 KIAS VMC; 150 KIAS IMC
• C. 140 KIAS VMC; 170 KIAS IMC
• D. 150 KIAS VMC; 170 KIAS IMC

Answer: (A)

When a hydraulic system is inoperative, flight-control authority is reduced. That means the helicopter is harder to maneuver, especially when you’re counting on visual references versus instruments. Because you can rely on outside cues in VMC, you can tolerate a higher indicated airspeed before control becomes unsafe. In IMC, you must depend on instruments with less margin for error, so the safe envelope is smaller. The published limits reflect that: 150 KIAS in VMC and 140 KIAS in IMC. The higher number in visual conditions gives you more speed room with good visibility, while the lower number in instrument conditions provides a safer buffer for maintaining control when you can’t see outside.

When a hydraulic system is inoperative, flight-control authority is reduced. That means the helicopter is harder to maneuver, especially when you’re counting on visual references versus instruments. Because you can rely on outside cues in VMC, you can tolerate a higher indicated airspeed before control becomes unsafe. In IMC, you must depend on instruments with less margin for error, so the safe envelope is smaller.

The published limits reflect that: 150 KIAS in VMC and 140 KIAS in IMC. The higher number in visual conditions gives you more speed room with good visibility, while the lower number in instrument conditions provides a safer buffer for maintaining control when you can’t see outside.