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Cross-Controlled Stall Demonstration

The base-to-final skid is one of the classic killers in the traffic pattern. The cross-controlled stall demonstration is that skid flown on purpose at altitude, with a qualified instructor aboard, so that nobody's first look at it comes from a thousand feet on final.

Slow Flight, Stalls and Spins — FI.X.F

Why this demonstration exists

A student is flying the pattern and overshoots the turn from base to final. The runway centerline slides out to the left of the nose and they want it back. They have been told that steep banks close to the ground are dangerous and they believe it, so the bank stops at about thirty degrees. Instead comes bottom rudder, to swing the nose around. The airplane skids. The nose slices down through the horizon, which looks wrong from the seat, so they pull.

That is the entire accident: a bank they refused to use, a rudder input substituted for it, and back pressure applied to fix what the rudder did. This is the one maneuver built to reproduce that sequence on purpose, high enough that it costs nothing. It is a demonstration, not a practice item — the Flight Instructor ACS groups it with the stalls an instructor shows a learner for stall and spin awareness, and it belongs in an airplane approved for the maneuver with a qualified instructor aboard. Nobody should go set up a deliberate skidding stall alone. What you are learning is what an airplane does when it stalls out of uncoordinated flight, and how to put that in front of a student without frightening either of you. The correct answer to an overshoot is a go-around, and this demonstration is what makes that answer feel obvious rather than embarrassing.

What is actually stalling

A stall is the disruption of smooth airflow over the wing and the loss of lift that follows, and it happens when the angle between the chord line and the relative wind exceeds the critical angle of attack. Nothing in that sentence mentions speed. You can exceed the critical angle at any airspeed, in any attitude, at any power setting, and in a cross-controlled turn you will do it with the airspeed indicator showing a number that looks entirely reasonable.

Bank makes it easier. In a level turn the wing carries more than the airplane's weight, and stall speed rises with the square root of load factor — a 45-degree bank is about 1.4g and raises stall speed roughly twenty percent. Bank and load factor set the speed at which the wing will quit; coordination decides what the airplane does at the moment it quits. Both are working on you here, which is why the demonstration is flown in a turn and not wings level.

Slip and skid

Take a model airplane in your hand for this part, because it is a geometry problem before it is an aerodynamics problem. In a slip there is too little rudder for the bank; the airplane slides toward the low wing and the ball falls to the inside of the turn. In a skid there is too much rudder into the turn; the tail swings outward, the airplane skids toward the outside, and the ball goes to the outside. Both are uncoordinated, and a stall out of either one is a cross-control stall. The skid is the one that breaks hardest.

In the skid, the outside wing is traveling through the air faster than the inside wing and makes more lift, so the bank wants to steepen on its own. The pilot who did not want to bank now holds opposite aileron to stop it. That lowered aileron on the inside wing increases its angle of attack further, so the inside wing — the low one, the slow one — reaches the critical angle first. When it lets go, the airplane rolls rapidly in the direction it was already turning, toward the ground, and it does it far faster than any wings-level stall you have practiced. A stalled wing with the rudder still deflected into the turn is a spin entry, in the textbook sense: the yaw is already there, and back pressure is the only ingredient missing. That is why the demonstration is recovered at the first indication and why the rudder comes to neutral as part of the recovery rather than after it.

The slip is not harmless either. Stalled out of a slipping turn, the airplane tends to break less violently and often rolls back toward level rather than away from it, but it is still a stall out of uncoordinated flight and it gets the same recovery. Treat the difference as one of degree.

Flying the demonstration

1. Confirm the airplane is approved for the maneuver and loaded within the weight and center of gravity limits your POH gives for it, and brief the recovery with your instructor before you take the runway.
2. Clear the area, and pick an altitude that lets you complete the recovery no lower than 3,000 feet AGL. That floor is set for spin recovery, not for the stall.
3. Set the airplane up the way the Airplane Flying Handbook asks: landing gear extended if it retracts, throttle closed, and flaps left up. This is deliberately not the landing configuration — the break is pronounced and nose-down and the speed builds quickly, and flaps would put you against a limit speed while you are busy. Slow to the normal approach speed in your POH, establish a stabilized descent, and trim it.
4. Roll into a medium-banked turn — the bank you would actually use turning final.
5. Feed in rudder in the direction of the turn, more than the turn needs, and hold the bank from steepening with opposite aileron.
6. Add back pressure, as a pilot trying to keep the runway in sight would.
7. Recover at the first indication of the stall.

The cues are the ordinary ones — the controls going mushy, the stall warning, the buffet — but which of them arrives first, and how loud it is, depends on the airframe, so learn the order in the airplane you teach in rather than carrying one over from another type. Expect them to be quieter and closer together than in a power-off stall, because the entry is faster and the attitude looks normal. Teach the feel of the controls and the horn rather than the airspeed indicator.

Recover at the first indication, and let that be the whole of it. The part worth showing a student is the entry: the rudder going in, the nose slicing down, the bank loading up against the aileron. Allowed to develop, this stall drops the nose and rolls the airplane abruptly toward the ground with the rudder still deflected, and the next thing after that is a spin. There is nothing to be gained by waiting for it, and the standard the demonstration is graded against does not ask you to.

The recovery

Reduce the angle of attack first. Release the back pressure and keep the nose-down input in until the stall warning stops. Neutralize the rudder as you do it — the deflected rudder is the yaw that turns a stalled wing into a spin — then neutralize the aileron, level the wings with coordinated control, add power as needed, and return to the flight path you started from. The order matters: wings before angle of attack, or power before angle of attack, is how a demonstration becomes an incident. If the airplane does depart despite all of that, fly the spin recovery procedure in your POH. The altitude floor exists so there is room to.

What goes wrong

Entering too fast is the most common setup error — the cues blur together and you risk an accelerated stall instead of the one you meant to show. Reaching for the flaps out of landing habit is the other one, and it is worth catching on the ground rather than in the descent. After the break, the errors are the familiar ones: leveling the wings before reducing the angle of attack, reaching for power before reducing the angle of attack, and hauling the nose back up too early into a secondary stall. Leaving the rudder in belongs on that list too, because it is the one that decides whether you are recovering a stall or a spin. On the other side, waiting past the first indication because the demonstration seems tame is how you find out what the airplane will do with full rudder in and a wing stalled.

Manage the rest before you start. Watch the altitude you are burning, the terrain and traffic below you, turbulence that can trigger the stall earlier than you planned, and density altitude that lengthens every recovery. Distraction is the real hazard in the airplane this demonstration is modeling, and it is a hazard while you are demonstrating it too.

Where you meet it next

You will be asked to demonstrate this on the flight instructor checkride, and to talk through the scenario that produces it, which is why the pattern story matters as much as the control inputs. It sits inside a group of lessons that share its aerodynamics. The spins lesson is the one to read directly alongside it, because the skid you are producing here is the entry a spin starts from. The accelerated stall lesson takes up the other half of the paragraph above, where load factor raises the speed at which the wing quits. The secondary stall lesson covers the recovery you rush, and the elevator trim stall lesson covers the other instructor demonstration your students meet on a go-around. The slow flight lesson is where the angle-of-attack cues get familiar enough to be useful at the first indication, and the forward slip to landing lesson is worth reading next to the slip-and-skid section here — a slip flown on purpose, watched and coordinated with the nose down, is a tool rather than a hazard.

Mostly, though, you meet it in the traffic pattern, in the half second where you are tempted to press the rudder instead of the go-around. The rest of the ground school will keep coming back to the same rule: fly the airplane coordinated, and if the approach is not working, leave.