Why Planes Spin

What Makes a Plane Spin?

A spin sounds scary, but it only happens when two things go wrong at the same time. If you stop one of them, you cannot spin. Let's meet the parts.

Stall

When the wing is angled too steeply, the air stops flowing smoothly over it and it stops lifting. You learned this in your stall lessons.

Yaw

When the nose swings sideways. The rudder pedals make yaw happen on purpose, but yaw can also sneak in when you are not coordinated.

The Ball (Inclinometer)

A little ball in a curved tube at the bottom of your instruments. When it sits right in the center, you are coordinated and a spin cannot start. When it slides to one side, watch out.

Coordinated Flight

Flying with the ball centered — wings and nose working together. "Step on the ball" means press the rudder pedal on the side the ball slid toward to push it back to the middle.

Spin = stall + yaw. If the wing stalls while the airplane is also yawing, one wing stalls more than the other and the airplane rolls and twists down. Here is the fun part: the ball instrument is your anti-spin device — keep it centered and you simply cannot spin!

Instructor Setup

Cessna 172 with G1000, set up in slow flight at a safe altitude (around 4,000 feet AGL) over open terrain. Plan about 20 minutes. This session is demonstration and recognition only — no intentional spin entry by the student.

Session Flow

1. Recap and brief (3 min). Review stall + yaw = spin on the ground using the G1000 PFD. Point out the slip/skid indicator (the ball) and the "step on the ball" rule.
2. Set up slow flight (4 min). Slow to roughly 55 knots, flaps as desired, and have the student hold altitude while watching the ball. Stress positive exchange of controls.
3. Coordinated vs. uncoordinated demo (7 min). You fly. Demonstrate a slow-flight stall with the ball centered (straight break), then with the ball off center (one wing drops first). Keep it gentle and recover early — incipient only, no developed spin.
4. Student practice (4 min). Student flies slow flight and keeps the ball centered, stepping on it whenever it drifts. Call out ball position together.
5. Wrap (2 min). Recap the anti-spin rule and preview "Don't Spin!"

Keep recoveries early and the airplane coordinated. The goal is cause-and-prevention awareness, not spin handling.

Debrief

Confirm the student can explain the cause of a spin and demonstrate keeping the ball centered before moving on.

• Explained that a spin is a stall plus yaw happening together
• Identified the ball (slip/skid indicator) on the G1000 and read it correctly
• Watched the difference between a coordinated stall and an uncoordinated one
• Kept the ball centered in slow flight and stepped on it when it drifted

Next Lesson

Next up is "Don't Spin!" (K26): spotting an incipient spin — the very start of a spin — and reacting immediately with rudder. If reading the ball was shaky today, spend the first two minutes of K26 reviewing it before practicing.

Skills You'll Work On

These are the maneuvers and procedures covered in this lesson. Your instructor tracks each one as you progress.

• Spin Avoidance Techniques
• Stalling in a Turn

Grades reflect what was covered in this lesson, not a certification of pilot competency.

Lesson Plan

Where this fits: First of three sessions drawn from PPL Lesson 9, "Spin Avoidance." This session covers what causes a spin and how to prevent one; K26 covers incipient spin recovery and K27 covers unusual attitude recovery.

Prerequisite

Completion of the stall lessons (K22 through K24) — the student should recognize a stall and its warning signs.

Materials

C172 G1000 simulator, student checklist card, headset.

Goal for this session

Student can describe the stall-plus-yaw cause of a spin and keep the ball centered during slow flight.

Looking Ahead

• K26 — Don't Spin!: recognize an incipient spin and recover with opposite rudder.
• K27 — Unusual Attitudes: recover from nose-high and nose-low surprises.