How far past the numbers should I fly before turning base on a power-off 180?

It depends on wind and altitude. A headwind on final helps slow your groundspeed over the runway, so you can fly slightly further before turning. A tailwind requires an earlier base turn to avoid floating long. At standard pattern altitude in calm winds, a brief extension - just enough to let the nose settle and speed stabilize - is typically all that is needed.

What is a forward slip and when should I use it on this approach?

A forward slip uses opposite aileron and rudder inputs simultaneously to create drag and lose altitude rapidly without changing your ground track. Use it when you recognize - ideally half a mile or more from the threshold - that you are carrying too much altitude. It is far more effective when applied early than when applied in the final moments before touchdown.

What should I do if I realize I am going to land short?

Tighten your turn to final to reduce the distance remaining to the runway. Do not pull back on the yoke to stretch the glide. Pulling back slows the aircraft below best glide speed, which increases the rate of descent and moves the touchdown point even shorter - the opposite of what you need.

Will an examiner fail me if I go around on a power-off 180?

Not for a genuine safety-of-flight reason. The ACS prohibits adding power except when a real hazard exists - a runway incursion, an unavoidable overrun, or a confirmed obstacle. Recognizing and responding to those situations is correct airmanship. A go-around executed because of poor energy management, where landing long would have been safe, is a different matter and will be noted as a missed maneuver.

The Power-Off 180 Accuracy Landing, the Energy Budget You Set at Idle, and the Judgment Calls That Separate a Passed Checkride from a Busted One

The power-off 180 accuracy landing simulates an engine failure from downwind and requires touching down within 200 feet beyond a designated target point. It is one of the most technically demanding maneuvers on the private pilot checkride because it rewards pilots who operate from a system - not those who hope the math works out on short final. Every correct decision happens before you turn base, not after.

What Is the Power-Off 180 Accuracy Landing?

The name explains the maneuver: power off, 180 degrees of turn, accuracy landing. You simulate an engine failure abeam the numbers on downwind and turn roughly 180 degrees to land at a predetermined point on the runway.

The purpose is to demonstrate you can land an airplane without an engine - not somewhere in the vicinity, but at a specific target using only the energy already on board. There is no power to bail you out and no go-around as a fallback.

200 feet sounds generous until you arrive long on final. That margin disappears quickly when energy management breaks down on base.

What Does the ACS Require for the Power-Off 180?

The Airman Certification Standards (ACS) require:

Touch down within 200 feet beyond the selected landing point - not before it, beyond it
Maintain heading within 10 degrees of the runway centerline at touchdown
No addition of power unless a genuine safety-of-flight concern exists
Manage the approach without hazards - not just the numbers, but sound decision-making throughout

The last requirement matters. Examiners are grading judgment, not just touchdown coordinates.

Where Does the Maneuver Begin?

The entry point is abeam the displaced threshold or landing zone markers on left downwind, at pattern altitude. When you reach that point, close the throttle - not reduce it. Idle. Done.

Some pilots leave a small amount of power in out of hesitation. That changes the energy budget and corrupts the approach. Pull to idle, set your glide speed, and start flying the energy you have.

On a Cessna 172, best glide speed is approximately 65–68 knots depending on weight. On a Piper Cherokee, it is similar. Know your aircraft’s published best glide speed and fly it from the moment power comes off.

Carburetor icing is a real risk during prolonged power-off descents in carbureted engines. Apply carb heat when you pull power and leave it on throughout the approach. If a genuine go-around becomes necessary, come off carb heat just before advancing the throttle.

How Should You Think About Your Energy Budget?

The altitude you have when you pull the throttle is your energy budget. It does not increase. Everything from that moment forward is a decision about how to spend it down to the threshold.

The Cessna 172 has a published glide ratio of approximately 9:1 - for every foot of altitude, it travels roughly nine feet forward with no wind. At 1,000 feet AGL, best glide puts you approximately 1.5 miles forward. That is more than enough to work within a standard traffic pattern.

Know your aircraft’s glide ratio. Do not try to fly a Cessna-shaped power-off 180 in a Piper.

What Are the High Key and Low Key Decision Points?

Two checkpoints frame the most important flying in the entire maneuver.

High key is your position abeam the target at pattern altitude - your starting energy state. Low key is when you roll out on base, roughly perpendicular to the runway. By low key, you must have a clear, honest read on whether you have enough energy to make the runway, or too much.

The judgment call made between high key and low key determines the outcome. It does not happen on short final.

When you turn to base, assess the runway honestly:

Numbers appear far below you: You are high. Too much energy. Plan to extend base or use a forward slip on final.
Numbers are well above you and you are already sinking fast: You turned base too late. You will be short. Tighten the turn to final immediately.
Numbers are roughly at or slightly below the horizon: You are in the ballpark.

How far you fly past the numbers before turning base is the first major decision point. Wind is the primary variable. A headwind on final slows your groundspeed and helps you land shorter - you can afford to fly further before turning. A tailwind requires turning base sooner to avoid floating long.

How Do You Use Flaps on a Power-Off Approach?

Flaps are a one-way door on a power-off approach. You can add them. You cannot take them back in any way that helps you glide further.

Add flaps progressively. Use partial flaps on base to stabilize the descent. Assess. Then add full flaps only when you are confident the field is made.

Dumping full flaps in the middle of base because you feel slightly high is one of the most common errors in this maneuver. You spend your best energy-management tool while a long final still lies ahead and no recourse remains if the situation changes.

When and How Do You Use a Forward Slip?

A forward slip is the correct tool when you are high on a power-off approach. It bleeds altitude and airspeed without changing your ground track. In a Cessna 172, a properly executed forward slip can remove significant altitude over a short distance without building excess speed or drifting off centerline.

Examiners will not penalize a forward slip on this approach. It is a legitimate energy management technique. What they are watching is whether you recognized the need early enough for it to be effective.

If you are half a mile out and high, a slip will bring you right to the target. Wait until you are a quarter mile out before acknowledging the problem, and you may be out of options. Early recognition is the skill - not late correction.

A Walk-Through: Cessna 172, Runway 27

Setup: Cessna 172, right traffic, 1,000 feet AGL, 10-knot headwind on final, clear day.

Abeam the numbers: Throttle to idle, carb heat on, nose down for 65 knots. Stabilize.
Turn base: Fly just past the numbers, then turn. Apply 10 degrees of flaps. Assess the runway.
Base assessment: Numbers are roughly where they should be, possibly slightly low. You are in the ballpark.
Roll out on final: Add 20 degrees of flaps. Approximately one mile out - but slightly high. Landing zone markers are below the nose.
Make the call now, not on short final: Enter a forward slip. Left rudder, right aileron. Track the centerline while bleeding altitude. Come out of the slip as you approach the threshold.
Full flaps. Float briefly over the threshold, flare, touch down on the landing zone markers.

That is a system. Not a guess.

What Mistakes Do Pilots Most Often Make on the Power-Off 180?

Turning base too late. Pilots who are uncomfortable with lower approaches fly a long downwind trying to stay high. By the time they turn base, they are past the extended centerline and must fly a tight, descending turn to final. They arrive low and chasing the runway. A timely base turn at a normal pattern position is the cure.

Too much flap too early. Adding full flaps on mid-base depletes your best energy tool while a long final remains ahead.

Stretching the glide. When going short, pilots pull back on the yoke trying to float the airplane toward the runway. This slows the aircraft below best glide speed, increases the rate of descent, and moves the touchdown point shorter - the opposite of the intended result. If you are going short, tighten the turn to final. Never pull back to stretch the glide.

Not accounting for wind. Wind is the largest variable in this maneuver. Know the wind direction and speed before entering the pattern, and know whether you will have a headwind or tailwind on final. That single factor governs how far past the numbers you fly before turning base.

When Is a Go-Around the Right Call?

The ACS prohibits adding power unless a genuine safety-of-flight concern exists. That does not mean go-arounds are forbidden - it means a go-around is not part of the maneuver.

If you are going to land in the overrun, encounter a runway incursion, or face an actual hazard, add power and go around. That is correct airmanship. An examiner will not fail you for recognizing a genuine hazard.

What an examiner will note is a go-around triggered by poor energy management when landing long would have been acceptable. That is a missed maneuver, not good airmanship.

How Do You Know You’re Ready for the Checkride?

Practice until you can predict your landing point before you turn base - not after rolling out on final. Abeam the numbers, with the throttle at idle, you should already know whether you will need a forward slip or whether a standard final is ahead.

That predictive ability comes from repetition combined with a genuine understanding of the energy involved. When you can close the throttle and already see the answer, you are ready.

Key Takeaways

The power-off 180 requires touching down within 200 feet beyond the target with no power addition and heading within 10 degrees of centerline.
Your altitude at throttle closure is a fixed energy budget - every decision from that point is about spending it correctly down to the threshold.
The most critical flying happens between high key (abeam the numbers) and low key (base leg) - decisions made there cannot be undone on short final.
Flaps are irreversible on a power-off approach; add them progressively and commit to full flaps only when the field is made.
A forward slip is the correct, examiner-approved tool for excess altitude - use it early, when it can still save the approach.