Further action to recover from retreating blade stall may be required. This includes: 1 REDUCING airspeed, 2 REDUCING the severity of the maneuver (i.e. rolling out), 3 ensuring the aircraft is in trim.

• A. Reducing airspeed
• B. Reducing the severity of the maneuver (i.e. rolling out)
• C. Ensuring the aircraft is in trim
• D. All of the above

Answer: (D)

Retreating blade stall happens when the blade on the retreating side reaches a high angle of attack during a turn or accelerated flight, causing a loss of lift and a tendency to roll or pitch away. Recovery focuses on reducing the conditions that promote the stall and stabilizing the rotor system.

Lowering airspeed reduces the relative wind and the angle of attack seen by the retreating blade, helping it re-dress and re‑establish lift. Easing the maneuver by rolling out or reducing bank decreases the differential loading between the advancing and retreating blades, which lowers the retreating blade’s angle of attack and relieves the stall. Keeping the aircraft in trim minimizes pilot workload and prevents inadvertent inputs that could increase blade angle on the retreating side. Since each step address a facet of the stall condition—blade angle, load, and control accuracy—all of these actions may be required to recover.