6.22
Split-S (Figure 6.9).
6.22. Split-S (Figure 6.9).
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6.22.1. Objective. Complete a max performance, 180-degree descending turn in the pure vertical.
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6.22.2. Description. The split-S combines the first half of an aileron roll with the last half of a loop. It demonstrates how much altitude is lost if recovery from inverted flight is attempted by pulling through the horizon. The aircraft climbs during entry and descends during recovery. The maneuver is complete when the aircraft returns to level flight.
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6.22.2.1. Airspeed - 120-140 KIAS.
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6.22.2.2. Power - Idle to 80 percent.
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6.22.2.3. Attitude - Entry: 20 degrees nose high. Wings level before and throughout pull.
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6.22.2.4. Altitude - Approximately 2,500 feet below entry altitude.
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6.22.2.5. FCP visual reference - Corner of forward windscreen on horizon to start roll.
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6.22.3. Procedure. Begin in straight-and-level flight approximately 40 KIAS above briefed entry airspeed. Briefed power setting may be established any time before or during the half roll. Raise the nose to an approximately 20-degree pitch attitude (FCP clock/air vents on the horizon). When the airspeed is approximately 20 KIAS above briefed entry airspeed, roll the aircraft to the wings-level, inverted attitude. Apply back pressure to bring the nose through the horizon. To avoid excessive G and airspeed at the bottom, attempt to max perform by pulling aft on the stick to approximately 15 to 15.5 AOA once the nose passes the horizon. Airspeed and G loading (approximately 3-4 Gs) increase during the pullout. Due to the potential rapid increase in G loading, pilots should consider performing an AGSM before G onset.
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6.22.4. Technique. Attempt to set up the maneuver over a road or section line. If a ground reference is not available, the heading bug may be used to ensure a straight pull. Ensure wings are level-inverted before starting pull. Imagine pulling to the flightsuit “zipper” to ensure a straight pull. Looking at successive points above the canopy bow (as described on the back half of the loop) that lead in a straight line from below the aircraft out to the horizon can also help ensure a straight pull.
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