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Steep Turns

A steep turn is a coordinated 45-degree bank held all the way around. It is not a test of nerve — it is a demonstration that you can feel a wing being asked to do two jobs at once, and keep it doing both.

Performance Maneuvers — FI.IX.A

Why the maneuver exists

How much bank depends on the certificate you are working toward — 45 degrees at private, 50 at commercial — and either way the turn has to close on the heading it opened on. Nothing in ordinary flying asks for that much bank, which is the whole reason the maneuver is on the test: the airplane behaves differently up there, and you want to have met that behavior before the day you need the turn.

What it teaches is control at a bank angle where the airplane stops helping you: what your airplane feels like with the wing loaded, and how to hold altitude and airspeed while most of your attention is outside. Both skills show up again in maneuvers that are far less forgiving.

What it feels like

You will feel heavier in the seat. That is load factor, and it is the honest signal that the wing is working harder. The controls get heavier with it, and the nose feels as though it wants to fall away from you.

None of it is misbehavior. It is the airplane telling you what it needs: back pressure to hold the nose where you put it, and power to hold the airspeed while the wing pays for the extra lift with drag.

The aerodynamics

Lift splits into two jobs

Lift acts perpendicular to the relative wind, along the airplane's vertical axis. Roll the airplane and that force tilts with it, so it now has a vertical component holding you up and a horizontal component pulling you around the turn. The horizontal component is what turns the airplane — but it comes out of the same total, so the vertical component is now smaller than the weight, and you descend.

The fix is to make more total lift, which means more angle of attack, which means back pressure — and at 45 or 50 degrees, considerably more of it than you are used to.

Load factor and stall speed

All that extra lift is carried by the structure and by you. In a level, coordinated turn the load factor depends on bank angle alone — not on weight, speed or airplane type. A 45-degree bank is about 1.4 G, a 50-degree bank about 1.56 G, and a 60-degree bank a full 2 G.

Stall speed rises with the square root of load factor, so those same bank angles raise it by roughly 19, 25 and 41 percent. That is why an accelerated stall is a live risk here: the wing can stall at a speed the airspeed indicator makes look perfectly comfortable. Yanking in back pressure to recover a sagging altitude is exactly how pilots find that out.

The outside wing wants more

In a turn, the outside wing travels a longer arc in the same time, so it flies slightly faster and makes slightly more lift. How much that matters depends on the radius of the turn and the airspeed: the tighter and slower the turn, the bigger the difference between the two wings, and the stronger the airplane's tendency to keep rolling steeper on its own. That is the overbanking tendency, and in a steep turn you should expect it. How much aileron it actually takes to hold the bank varies by airplane — in some trainers, at typical steep-turn entry speeds, the pressure needed sits close to neutral or even slightly into the turn. Fly the bank you want and let the airplane tell you which way it needs to be held.

Maneuvering speed, and what it does and does not protect

Steep turns are flown at or below maneuvering speed. At or below VA, a full, abrupt deflection of one control, in one direction, is not expected to overstress the airframe: the wing reaches its stalling angle of attack before the symmetric load it generates reaches the structural limit.

Those qualifiers are not fine print. Inputs on more than one axis at once, or a rapid reversal of a control, can exceed limit loads below VA — a reversed rudder input loads the vertical stabilizer asymmetrically, and nothing about the wing stalling limits that load at all. Airframes have been broken this way below VA. VA also offers no protection against gust loads. Treat it as a speed that keeps honest, single-axis handling within limits, not as a speed at which the airplane cannot be broken.

VA is not a fixed number either: it decreases as weight decreases, because a lighter airplane reaches limit load at a lower speed. Take the value for your weight from your POH.

Rate and radius

Steepening the bank at a constant airspeed increases the rate of turn and tightens the radius. That is the practical payoff — a steep turn is how you reverse course in the smallest piece of sky — and it is also why everything happens faster than you expect.

Flying it

1. Clear the area. Look through the turn and above and below you, and pick a visual reference on the horizon at your entry heading.
2. Set the entry speed and power from your POH — at or below VA.
3. Roll smoothly to the target bank, adding back pressure and power as the bank passes about 30 degrees rather than after the altimeter has already moved.
4. Hold it there. Bank with whatever aileron pressure your airplane asks for, altitude with pitch, airspeed with small power changes, and the ball centered with rudder.
5. Keep your eyes outside on the horizon reference, cross-checking the instruments — not the reverse.
6. Lead the rollout by roughly half the bank angle so you finish on your entry heading, releasing the back pressure and the extra power as the wings come level.

Catch altitude early, and correct it knowing the two cases are not mirror images. Shallowing the bank puts more of the lift back into holding you up — which is what you want when you are sinking, and the opposite of what you want when you are already climbing. So if you are gaining altitude, relax some of the back pressure, and restore the bank if it has gone shallow on you. If you are losing altitude, reduce the bank slightly and add back pressure as needed, recover what you lost, then re-establish the bank. Keep airspeed corrections small, or a big power change hands you a yaw problem on top of the one you had.

What goes wrong

The failures cluster. Altitude drifts because back pressure was late, or never enough, or too much and traded for a climb. Bank wanders because it was never really established and the airplane was allowed to roll where it liked. Coordination slips, and an uncoordinated steep turn is where an ordinary altitude error becomes a stall-spin scenario.

Two more are about where you are looking: flying the maneuver off the attitude indicator instead of the horizon, and stopping the scan for traffic once the turn is established. Rolling out early, or blowing through the entry heading, usually means the rollout was never planned.

Managing the risk

Clear the area and keep clearing it — a 360-degree turn sweeps you through every bearing, and the airplane you did not see is the one behind the wing you just raised. Plan the maneuver so that recovery is complete no lower than 1,500 feet AGL, and stay away from terrain and obstacles; a steep turn flown low is a classic setup for controlled flight into terrain. If something distracts you mid-maneuver, fly the airplane first.

Where you meet it next

On the checkride, steep turns sit in the performance and ground reference maneuvers area of operation at private, commercial and CFI. At private you fly a 360 in each direction at 45 degrees, holding bank within 5 degrees, altitude within 100 feet, airspeed within 10 knots, and rolling out within 10 degrees of your entry heading. The commercial standard is the same set of tolerances flown at 50 degrees. At CFI you both demonstrate the maneuver and teach it, to the standard for the certificate level involved — check the current ACS for the certificate you are flying before you go.

The aerodynamics travel further than the maneuver does. Load factor and the raised stall speed are the same ideas behind accelerated stalls and behind the base-to-final overshoot; the outside-wing story returns in turns around a point, and the habit of holding altitude with your eyes outside is the whole of slow flight. You will find those alongside this one in the ground school lessons.