6.11. Stability Demonstration. The stability demonstration shows the low speed flight characteristics of the aircraft in extreme attitudes. Although airspeed is below level-flight stall speed, the aircraft will not stall if there is no attempt to attain level flight. In addition, the aircraft will not depart controlled flight (i.e., spin) if not stalled.

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6.11.1. Objective. Demonstrate that the aircraft will not stall, regardless of airspeed, if there is no demand placed on it to exceed critical AOA.

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6.11.2. Description.

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6.11.2.1. Airspeeds - Entry: 160 KIAS. Recovery: 80 KIAS or stick shaker.

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6.11.2.2. Power - Entry: 60 percent torque. Recovery: idle.

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6.11.2.3. Attitude - Raise the nose to 40-45 degrees pitch attitude wings level.

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6.11.2.4. Altitude Required – 2,000 feet above entry.

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6.11.2.5. Recover - Select idle power and neutralize controls, avoid 0 +/- 0.25 Gs.

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6.11.3. Procedure. Perform pre-stall (CLEF) checks. Accelerate to 160 KIAS, set 60 percent torque, and clear the area. Raise the nose to a 45-degree pitch attitude. Maintain coordinated wings-level flight. Hold this attitude until flying airspeed is depleted to approximately 80 KIAS, or stick shaker activation, whichever occurs first. Recover by selecting idle power and neutralizing all controls. Allow the nose to lower until positive pressure is felt on the controls. This indicates the aircraft is regaining flying airspeed. Recover to level flight without stalling the aircraft. The maneuver is complete when the aircraft is returned to level flight. Avoid near zero-G flight for greater than 5 seconds due to engine operating limitations.

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6.11.4. Technique. Estimate 45 degrees nose high by visualizing the feet on the horizon. Use memory aid, “idle-ize, neutralize” to guide recovery actions at 80 KIAS (or stick shaker). Cross-check the accelerometer (“G meter”) and maintain slightly more than 0.25 Gs with a small amount of back pressure on the control stick to avoid exceeding engine operating limits (i.e., “control the fall”). To avoid near zero-G flight for greater than 5 seconds, start a mental count once the control stick is neutralized. Before reaching the “5” count, ensure the pilot flying is putting positive-G (slight back stick pressure) on the aircraft. Visually confirm the neutral elevator stick position when checking the flight controls on the ground during pre- flight.

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