If both the #1 hydraulic pump and the backup pump fail, what maneuver is required?

If both the #1 hydraulic pump and the backup pump fail, what maneuver is required?

• A. Hover and depart in hover
• B. Roll-on landing at 40 KIAS or above
• C. Autorotate to landing at 0 KIAS
• D. Fly to nearest base on manual control

Answer: (B)

Loss of both the #1 hydraulic pump and the backup pump means you lose hydraulic augmentation of the flight controls. The helicopter becomes much harder to control, and hovering or precision control in a hover becomes unreliable. In this situation the recommended, safest way to get on the ground is a roll-on landing with forward airspeed—target about 40 knots or above. Flying with forward speed helps in two ways. First, the dynamic pressure over the rotor and the windmilling effect help keep rotor RPM from decaying as you descend, giving you the best chance of a controlled touchdown even without hydraulic help. Second, the forward speed reduces the amount of stick and pedal force required to achieve and maintain the desired attitude, making the approach more controllable when hydraulic assist isn’t available. Trying to hover and then depart would demand even more control force than you can reliably apply without hydraulics. Aut_rotating at zero airspeed isn’t the ideal method here because you need some forward speed to help keep rotor energy and control authority, and a roll-on at a modest forward speed provides a smoother, more predictable recovery to the ground. Heading for a base on manual control would be impractical in an emergency with hydraulics out, given the heavy control loads and limited time to execute a safe landing. So, roll-on landing at 40 KIAS or above is the best option because it preserves rotor energy and gives the most controllable, safe touchdown under hydraulic loss.

Loss of both the #1 hydraulic pump and the backup pump means you lose hydraulic augmentation of the flight controls. The helicopter becomes much harder to control, and hovering or precision control in a hover becomes unreliable. In this situation the recommended, safest way to get on the ground is a roll-on landing with forward airspeed—target about 40 knots or above.

Flying with forward speed helps in two ways. First, the dynamic pressure over the rotor and the windmilling effect help keep rotor RPM from decaying as you descend, giving you the best chance of a controlled touchdown even without hydraulic help. Second, the forward speed reduces the amount of stick and pedal force required to achieve and maintain the desired attitude, making the approach more controllable when hydraulic assist isn’t available.

Trying to hover and then depart would demand even more control force than you can reliably apply without hydraulics. Aut_rotating at zero airspeed isn’t the ideal method here because you need some forward speed to help keep rotor energy and control authority, and a roll-on at a modest forward speed provides a smoother, more predictable recovery to the ground. Heading for a base on manual control would be impractical in an emergency with hydraulics out, given the heavy control loads and limited time to execute a safe landing.

So, roll-on landing at 40 KIAS or above is the best option because it preserves rotor energy and gives the most controllable, safe touchdown under hydraulic loss.