VI. Performance Maneuvers – Task C. Autorotation with Turns in a Single-Engine Helicopter (Operational Requirements)

Objective

The commercial pilot applicant will demonstrate comprehensive understanding and proficient performance of autorotation with turns in a single-engine helicopter, meeting the requirements of 14 CFR 61.127 and the Commercial Pilot Helicopter ACS CH.XIV.C. Upon completion, the applicant will:

1. Explain the operational requirements for autorotation with turns including minimum entry altitude requirements (700 feet AGL minimum or higher in strong winds), turn parameters (two 90-degree turns in same direction OR one continuous 180-degree turn with respect to ground track), and mandatory roll-out altitude (300 feet AGL)
2. Identify and mitigate risks associated with turning autorotations including altitude management, wind drift compensation, and adherence to decision height protocols
3. Demonstrate smooth entry, precise altitude management, coordinated turns totaling at least 180 degrees of ground track change, and timely roll-out by 300 feet AGL
4. Execute proper power recovery procedures if roll-out completion by 300 feet AGL is not achieved
5. Maintain rotor RPM within normal operating range (green arc), coordinate all control inputs, and demonstrate professional judgment in selecting appropriate entry altitude based on environmental conditions

Content

Regulatory Foundation

14 CFR 61.127(b)(1) requires commercial helicopter applicants to receive and log training in autorotational descents with power recovery and power recovery to a hover. The autorotation with turns maneuver builds upon this foundation by testing the pilot’s ability to manage energy, maintain aircraft control, and navigate while simulating engine failure—all critical skills for commercial operations including external load work, aerial application, and passenger-carrying flights where off-airport forced landings may be necessary.

14 CFR 91.119 minimum safe altitudes apply to this training—while practicing, you must remain high enough to execute a safe autorotative landing without hazard to persons or property on the surface. The 700-foot AGL minimum entry altitude specified in the ACS ensures adequate margin for maneuvering while maintaining compliance with federal regulations.

Aerodynamic Principles Review

While commercial students already understand basic autorotation aerodynamics from private training, the addition of turns introduces complexity. In established autorotation, the upward flow of air through the rotor system (generated by descent) provides the energy to keep the rotor turning. The rotor disc is divided into three regions: the driven region (near mid-span where airflow produces driving force), the driving region (outer portion where induced flow creates autorotative force), and the stall region (near the hub where reversed flow exists).

When you introduce a turn during autorotation, several factors change simultaneously:

• Bank angle increases descent rate — The vertical component of rotor thrust is reduced by the cosine of the bank angle, requiring increased descent rate to maintain rotor RPM
• Load factor increases — Even in a coordinated turn, load factor exceeds 1G, which increases the induced flow requirement and steepens the descent
• Advancing blade dissymmetry becomes more pronounced — The turning radius creates different relative wind velocities across the rotor disc
• Ground track versus heading divergence — Wind drift is continuous, meaning the helicopter’s nose position does not directly correlate to ground track change

Think of it like this: A straight autorotation is like gliding down a slide. An autorotation with turns is like spiraling down a corkscrew—you’re covering more distance through the air while still getting to the bottom, and the path is less efficient. That inefficiency shows up as increased descent rate.

Operational Requirements (ACS Knowledge Items)

Minimum Entry Altitude

The ACS establishes 700 feet AGL as the minimum entry altitude for autorotation with turns under normal conditions (CH.XIV.C). This altitude is significantly higher than straight autorotations for several critical reasons:

1. Additional altitude loss during turns — Banking increases descent rate; you’ll lose 100-200 feet more than a straight autorotation covering the same time
2. Maneuvering margin — Coordinating turns, monitoring ground track, and managing energy requires more pilot attention; altitude provides time for corrections
3. Decision altitude compliance — You must roll out by 300 feet AGL, leaving only 400 feet of usable maneuvering altitude from minimum entry
4. Emergency options — If you mismanage energy or encounter unexpected conditions (turbulence, wind shear), additional altitude provides recovery options

In strong wind conditions, a suitable higher entry altitude is required. “Strong winds” is not precisely defined in the ACS, but use professional judgment: winds above 15 knots, gusty conditions, mechanical turbulence, or significant wind shear should prompt entry at 1,000 feet AGL or higher. Here’s why:

• Wind gradient effects — Wind speed decreases near the surface; turning through different wind layers creates constantly changing groundspeed and drift
• Drift compensation complexity — Strong winds require continuous heading adjustments to achieve desired ground track, increasing pilot workload
• Turbulence — Rotor RPM management becomes more difficult in rough air; altitude provides buffer for RPM excursions
• Power recovery margin — If you must execute power recovery, strong winds may affect climb performance and require more altitude to safely complete

Document your chosen entry altitude in the aircraft logbook entry or training record, especially when using higher-than-minimum altitudes due to weather.

Turn Requirements

You must perform EITHER:

• Two 90-degree turns in the same direction, OR
• One continuous 180-degree turn

Critical understanding: These angles refer to GROUND TRACK change, not heading change. This is a frequent source of confusion and check ride failures.

Example: You enter autorotation heading north with a 20-knot west wind. To achieve a 90-degree ground track change to an east ground track, you might need to turn to heading 070° to compensate for drift. The turn is measured by where you’re going over the ground, not where the nose points.

Practical technique: Use ground references (roads, section lines, field boundaries) to verify ground track change. Before beginning the maneuver, identify visual references 90 and 180 degrees from your initial ground track. During the turn, confirm you’re tracking toward these references, not just flying headings.

Why the same direction? If performing two 90-degree turns, they must be in the same direction (both left or both right) to test consistent control coordination, not alternating muscle memory. The one continuous 180-degree turn tests your ability to maintain a sustained turn—equally valuable but different skill demonstration. Your choice may depend on wind conditions, available landing areas, and personal technique.

Continuous turn technique: A 180-degree continuous turn requires smooth, coordinated bank angle throughout. Most pilots use 15-20 degrees of bank. Steeper banks increase descent rate excessively; shallower banks may require too much altitude to complete 180 degrees. Monitor ground track constantly—you may need to vary bank slightly to compensate for wind.

Two 90-degree turns technique: This method allows brief wings-level stabilization between turns (typically 3-5 seconds). Roll into first 90-degree turn, roll out to verify ground track and reassess energy, then roll into second 90-degree turn in the same direction. This technique can be easier for energy management but requires precise timing to complete both turns before 300 feet AGL.

Mandatory Roll-Out Altitude

You MUST roll wings-level and complete your turn(s) by 300 feet AGL. This is not advisory—it is a mandatory decision altitude with specific consequences:

If you do not roll out by 300 feet AGL:

1. The evaluator MUST direct you to perform a power recovery and go-around
2. The Task is graded UNSATISFACTORY
3. You have failed this portion of the practical test

There is no gray area, no “close enough,” no evaluator discretion. The 300-foot decision altitude is absolute.

Why 300 feet AGL? This altitude represents the transition point from maneuvering flight to final approach configuration. Below 300 feet:

• You should be aligned with landing area
• Bank angles should be minimal or zero
• Full attention shifts to touchdown point selection and flare execution
• Insufficient altitude remains to safely complete additional maneuvering

In actual engine failure, continuing turns below 300 feet AGL dramatically increases accident risk due to:

• Reduced margin for flare timing errors
• Limited options if wind drift is misjudged
• Potential for loss of tail rotor authority in uncoordinated low-altitude turns
• Insufficient altitude to recognize and correct for misjudged landing area

Altitude awareness technique: During the maneuver, cross-check altimeter every 2-3 seconds. Call out altitudes: “1,000 feet—first turn,” “700 feet—second turn beginning,” “400 feet—rolling out now,” “300 feet—wings level.” Verbal callouts (even when solo) reinforce altitude awareness and create habit patterns.

Risk Management

Risk: Inadequate Entry Altitude Selection

Mitigation: Evaluate wind conditions before every practice autorotation with turns. Surface winds above 15 knots, winds aloft forecasts showing significant wind speed changes with altitude, turbulence, or gusty conditions all justify entering at 1,000+ feet AGL instead of the 700-foot minimum. Brief your planned entry altitude before initiating the maneuver. Remember: you can always enter higher, but you cannot add altitude once established.

Professional judgment scenario: If you’re practicing at a high-density altitude airport (4,000 feet or higher), consider that your descent rate will be higher than at sea level for the same indicated airspeed due to true airspeed differences. Higher entry altitude compensates for increased descent rate.

Risk: Failure to Complete Roll-Out by 300 Feet AGL

Mitigation strategies:

1. Plan the maneuver backward from 300 feet — If performing two 90-degree turns, mentally calculate: “I need to be rolling out of the second turn by 400 feet to ensure wings-level by 300 feet. Therefore I need to complete the first turn and begin the second turn no later than 500-550 feet.”

2. Conservative bank angles — Using 15-20 degrees of bank provides adequate turn rate without excessive altitude loss. Steeper banks feel more dynamic but consume altitude rapidly.

3. Establish personal minimums — Many professional pilots establish a “call the maneuver” altitude: “If I’m not rolling out by 350 feet, I’m behind the curve and will apply power immediately.” This 50-foot buffer prevents last-second decisions.

4. Know your helicopter’s performance — Different helicopters descend at different rates in autorotation. Robinson R22/R44 tend to descend 1,500-2,000 FPM in turning autorotation; Schweizer 300 may descend 1,200-1,500 FPM; turbine helicopters vary widely. Know YOUR aircraft’s characteristics through practice.

5. Wind drift awareness — Strong headwind during the turn means you’re covering less ground distance per degree of turn, requiring more turn (more altitude) to achieve the ground track change. Tailor your turn rate and plan accordingly.

What if you’re not going to make it? If you reach 350 feet AGL and have not completed your turns, apply power immediately. Do not try to “rush” the completion—adding back pressure or increasing bank angle to speed the turn will only increase descent rate further and may lead to rotor RPM decay or loss of control. On a check ride, voluntarily initiating power recovery before 300 feet demonstrates good judgment and is vastly preferable to blowing through the hard deck.

Risk: Rotor RPM Excursions During Turns

Mitigation: As you roll into the turn, the increased load factor and descent rate may cause rotor RPM to increase slightly. As you roll out, RPM may decrease. These are normal fluctuations if anticipated and managed.

Technique:

• Entering turn: Expect RPM rise; be prepared to apply slight aft cyclic to increase collective’s aerodynamic drag and control RPM
• Established turn: Monitor RPM continuously; most helicopters stabilize once the turn is coordinated
• Rolling out: Expect slight RPM decrease as load factor reduces; be prepared to lower collective slightly to maintain RPM

Never let rotor RPM approach redline or drop below green arc. If RPM begins to exceed limits, shallowing the bank angle is more effective than attempting to control RPM with collective alone. If RPM decays toward the bottom of the green arc, slightly steepening the descent (lowering collective) provides more airflow through the rotor system.

Risk: Disorientation or Loss of Ground Reference

Mitigation: Select ground references BEFORE entering the autorotation. Identify:

• Initial ground track reference
• 90-degree reference point
• 180-degree reference point
• Suitable landing areas within gliding distance throughout the maneuver

In low visibility or over featureless terrain (water, snow-covered fields, desert), this maneuver is significantly more challenging. Consider delaying training until better visual reference conditions exist, or using prominent landmarks (highways, rivers, urban areas) to maintain orientation.

Crosswind effect: Remember that your ground track will arc downwind if you fly constant heading. You must turn into the wind to maintain desired ground track. Visualize your ground track as a curved path over the surface, not a geometric circle in space.

Technique and Execution

Pre-Maneuver Setup

1. Altitude: Establish at least 700 feet AGL (or higher based on wind/conditions)
2. Airspeed: Cruise or training speed appropriate to aircraft type
3. Configuration: Level flight, cruise power, aircraft in trim
4. Clearing: Complete clearing turns and ensure adequate altitude AGL throughout 360-degree area
5. Ground reference selection: Identify visual references at 0°, 90°, 180°, and 270° from initial position
6. Landing area identification: Confirm suitable forced landing areas are available throughout maneuver area
7. Wind assessment: Note wind direction and velocity; plan turns to either turn into wind or compensate for drift
8. Brief the maneuver: State entry altitude, planned turn direction, and key altitude callouts

Entry Technique

The entry to autorotation with turns is identical to straight autorotation:

1. Reduce throttle to flight idle (or split needles per aircraft-specific procedure)
2. Simultaneously lower collective smoothly to full down to maintain rotor RPM in green arc
3. Apply right pedal as needed to maintain heading (compensating for loss of torque effect)
4. Establish autorotative airspeed with cyclic while monitoring rotor RPM

Commercial standard: Your entry should be smooth and immediate. Hesitation or multiple control movements indicate private-level proficiency, not commercial precision. The entire entry sequence (throttle reduction through stabilization) should occur within 2-3 seconds.

Turn Execution

Method 1: Two 90-Degree Turns in Same Direction

At approximately 600-700 feet AGL (depending on helicopter descent rate and personal technique):

1. Roll into first turn using coordinated cyclic and pedal input, 15-20 degrees bank
2. Monitor rotor RPM — slight increase is normal during roll-in; correct with small aft cyclic if needed
3. Reference ground track — ensure you are tracking toward the 90-degree reference point, not just turning to a heading
4. Compensate for wind — adjust heading as needed to achieve ground track change
5. Complete 90-degree ground track change at approximately 500-450 feet AGL
6. Roll wings-level briefly (3-5 seconds) to verify ground track and reassess energy state
7. Roll into second turn in same direction, again 15-20 degrees bank
8. Monitor ground track toward 180-degree reference point
9. Initiate roll-out no later than 350-400 feet AGL to ensure wings-level by 300 feet AGL
10. Confirm wings-level by 300 feet AGL, aligned with final approach ground track

Method 2: One Continuous 180-Degree Turn

At approximately 600-700 feet AGL:

1. Roll into turn using coordinated cyclic and pedal, 15-20 degrees bank
2. Hold bank angle constant while monitoring ground track progression
3. Make small heading adjustments to compensate for wind drift and maintain desired ground track arc
4. Monitor rotor RPM continuously — may need slight collective or cyclic adjustments to maintain green arc
5. Cross-check altimeter every 2-3 seconds — you are descending approximately 20-30 feet per second
6. At 180-degree ground track change (when aligned with your planned reciprocal ground track, NOT reciprocal heading), initiate roll-out
7. Complete roll-out by 300 feet AGL — if approaching 350 feet and turn is not complete, apply power immediately
8. Confirm wings-level and on centerline by 300 feet AGL

Common Errors and Corrections

Error: Fixating on heading instead of ground track Correction: Use ground references exclusively. The heading indicator is irrelevant in this maneuver—only ground track matters.

Error: Inconsistent bank angle during continuous turn Correction: Pick a bank angle (15-20 degrees) and hold it using attitude reference. Small variations are acceptable, but rolling shallower then steeper wastes altitude.

Error: Delaying turn initiation, rushing turns at low altitude Correction: Begin the turns early (600-700 feet AGL). If you’re at 400 feet and haven’t started turning, you will not complete the maneuver successfully.

Error: Rotor RPM decay during turns Correction: Ensure collective is FULL DOWN. If RPM still decays, slightly increase descent rate (lower nose attitude) to increase airflow through rotor system. Never add collective to try to support the turn.

Error: Uncoordinated turns (slipping or skidding) Correction: Cross-check ball in turn coordinator. In autorotation, you still need coordinated pedal input. Slipping turn (ball deflected to outside of turn) means insufficient pedal; skidding turn (ball deflected to inside of turn) means excessive pedal.

Error: Not completing roll-out by 300 feet AGL Correction: This is automatic Task failure on a check ride. Practice with personal minimums (roll-out initiation by 350 feet) to build margin. If doubt exists, apply power early.

Power Recovery Technique

If you do not complete roll-out by 300 feet AGL, or if energy state becomes unsatisfactory at any point:

1. Immediately roll wings-level (if still in turn)
2. Simultaneously increase throttle smoothly to cruise or climb power (re-join needles in governor-equipped aircraft)
3. Raise collective smoothly to stop descent and establish positive rate of climb, coordinating left pedal to maintain heading
4. Apply cyclic as needed to establish climb airspeed
5. Monitor rotor RPM — must remain in green arc throughout recovery
6. Climb to safe altitude before maneuvering

On a practical test: If the evaluator directs power recovery because you failed to roll out by 300 feet AGL, execute the recovery professionally and completely. The Task is unsatisfactory, but safe recovery demonstrates competence and airmanship. Arguing with the evaluator or appearing flustered demonstrates poor ADM.

Practical Application for Commercial Operations

Why does the commercial pilot ACS include this maneuver? Because commercial operations frequently place helicopters in situations where turning during a forced landing is necessary:

• External load operations — Operating over congested areas or obstacles; engine failure may require immediate turn to reach suitable landing area
• Aerial application — Working agricultural fields with obstacles (power lines, structures) on one side; turn away from hazards
• Pipeline patrol — Following linear infrastructure; nearest landing area may require 90-180 degree turn from patrol track
• EMS operations — Departing hospital helipads; engine failure shortly after takeoff may require turn back to landing area

The ability to manage altitude, maintain aircraft control, and navigate to a suitable landing area while handling an emergency is fundamental to commercial privileges exercised under 14 CFR 61.133.

Schedule

Note: Flight time may vary based on transit to/from practice area, fuel stops, and individual student proficiency. Schedule allows for 55 minutes flight time, typical for 1.0 Hobbs hour with ground briefing.

Equipment

Required References

• FAA-S-ACS-16, Commercial Pilot – Helicopter Airman Certification Standards (current edition)
• FAA-H-8083-21B, Helicopter Flying Handbook
• 14 CFR Part 61 (Subpart F – Commercial Pilots)
• 14 CFR Part 91 (Subpart B – Flight Rules, General Operating Rules)
• Pilot’s Operating Handbook / Rotorcraft Flight Manual for aircraft used

Training Materials

• Kneeboard with lesson plan summary card
• Sectional chart or training area map with ground references marked
• Checklist for autorotation with turns evaluation (ACS criteria)
• Current METAR/TAF for training area weather
• Stopwatch or timer (for altitude/time correlation practice)

Visual Aids

• Whiteboard or tablet for drawing ground track diagrams
• Model helicopter for demonstrating bank angles and ground track visualization
• Diagram showing 700 ft AGL minimum entry, turn progression, and 300 ft AGL roll-out altitude
• Chart showing typical descent rates in straight vs. turning autorotation for aircraft type

Aircraft & Equipment

• Airworthy helicopter appropriate for commercial training
• Sufficient fuel for 1.5 hours flight time minimum (including reserves)
• Operational engine monitoring instruments (tachometer, manifold pressure/torque)
• Functional altimeter with sensitivity to detect 50-foot altitude changes
• Functioning turn coordinator or attitude indicator
• Intercom system for clear instructor-student communication
• Practice area with suitable forced landing areas and visual ground references at multiple orientations

Recording Materials

• Aircraft logbook for endorsement
• Student pilot logbook
• CFI lesson record or training syllabus signoff sheet
• Practical test preparation checklist (if approaching check ride readiness)

Instructor Actions

1. Begin with objective review: “Today we’re covering autorotation with turns, ACS Task CH.XIV.C, which is a required commercial pilot maneuver. By the end of this lesson, you’ll be able to enter autorotation above 700 feet AGL, complete at least two 90-degree turns in the same direction or one continuous 180-degree turn with respect to ground track, and roll out wings-level by 300 feet AGL. This builds on your private pilot autorotation training but adds navigation, energy management, and precise altitude management requirements.”

2. Establish the regulatory context: “Let’s start with why this maneuver exists in the commercial ACS. Under 14 CFR 61.127, you’re required to demonstrate autorotations with power recovery—this is the advanced version. As a commercial pilot carrying passengers, cargo, or conducting external load ops, you need the ability to turn toward a suitable landing area during engine failure, not just descend straight ahead. The operational requirements we’ll discuss are not suggestions—they’re ACS mandates that determine pass or fail on your check ride.”

3. Present the minimum entry altitude requirement: “The ACS specifies 700 feet AGL minimum entry altitude, but—and this is critical—it also states ‘or a suitable higher entry altitude in strong wind conditions.’ What constitutes strong winds? The ACS doesn’t define it precisely, so you must use commercial pilot judgment. I recommend 1,000 feet AGL or higher if surface winds exceed 15 knots, if you have gusty conditions, or if wind shear or mechanical turbulence is present. Why? Because wind gradient near the surface changes your groundspeed constantly during the turn, turbulence makes RPM management harder, and you need altitude margin for corrections. On your check ride, if you choose to enter at 900 feet on a calm day, be prepared to explain why—show judgment, not just rule-following.”

4. Clarify the turn requirements with emphasis on ground track: “You must complete EITHER two 90-degree turns in the same direction OR one continuous 180-degree turn. Here’s where many applicants fail: these angles refer to ground track change, not heading change. Let me illustrate on the whiteboard. [Draw diagram showing initial ground track, 90° and 180° reference points, and wind drift effect.] If you’re heading north with a west wind and you want to establish an east ground track—90 degrees from your initial track—you might need to turn to heading 070 or 080 to compensate for drift. You’re not trying to fly headings; you’re trying to move over the ground in a specific pattern. Select ground references before you start—roads, section lines, field corners—and fly toward those references. The helicopter’s heading is just a means to achieve the ground track you want.”

5. Emphasize the 300-foot AGL roll-out requirement: “This is the hard deck, and it’s absolute. If you are not rolled out wings-level by 300 feet AGL on a practical test, the evaluator MUST direct you to apply power and go around, and the Task is UNSATISFACTORY. There is no examiner discretion, no ‘close enough.’ Let me be very clear about what this means in practice: [Use hand gestures to show altitude stack] You enter at 700 feet minimum. You’re descending approximately 1,500 to 2,000 feet per minute in a turning autorotation in this aircraft. That’s 25 to 33 feet per second. From 700 feet to 300 feet roll-out is 400 feet of usable altitude, which gives you roughly 12 to 16 seconds to complete your turns. If you perform two 90-degree turns, you need to complete both turns plus roll-out in that time window. If you do one continuous 180, you need to complete the arc and roll out. This requires planning, not improvisation.”

6. Explain the aerodynamic effects of turning in autorotation: “You already understand basic autorotation from your private training—rotor keeps spinning because air flowing up through it generates driving force. When we add a turn, three things change: First, bank angle reduces the vertical component of lift, so we descend faster to maintain the same rotor RPM. Second, load factor increases even in a coordinated turn, which requires more induced flow and further increases descent rate. Third, the advancing and retreating blade imbalance becomes more pronounced because the turn adds yet another velocity component across the rotor disc. Think of it this way: if a straight autorotation is sliding down a slide, a turning autorotation is spiraling down a corkscrew—you cover more distance through the air while descending the same vertical distance, and the path is less efficient. That inefficiency shows up as higher descent rate, typically 20 to 30 percent higher than straight autorotation.”

7. Teach risk identification and mitigation: “Let’s analyze the risks. Risk one: inadequate entry altitude. Mitigation: evaluate winds before every autorotation with turns, and enter higher if conditions warrant. Brief your planned entry altitude before initiating. Risk two: failure to roll out by 300 feet AGL. Mitigation: establish personal minimums—I recommend if you’re not rolling out by 350 feet, apply power immediately rather than gambling on last-second completion. Plan the maneuver backward from 300 feet: ‘I need to be wings-level by 300, so I need to start rolling out by 350-400, which means I need to complete my turn(s) by 400-450, which means I need to begin turning no later than 600-650.’ Work backward from the hard deck. Risk three: rotor RPM excursions during roll-in and roll-out. Mitigation: anticipate slight RPM increase as you roll into the turn due to increased load factor; be ready with slight aft cyclic if needed. Anticipate slight RPM decrease rolling out as load decreases; be ready to lower collective or increase descent slightly if RPM drops toward bottom of green arc.”

8. Detail the entry technique: “The entry is identical to straight autorotation, but it must be precise—this is commercial standard, not private. On my command ‘simulated engine failure,’ you will: reduce throttle to flight idle smoothly and positively, simultaneously lower collective fully to maintain rotor RPM, apply right pedal to maintain heading, and establish autorotative airspeed with cyclic. The entire sequence should be smooth and immediate—within two to three seconds from initiation to stabilized autorotation. Any hesitation or multiple corrections indicates you’re not at commercial proficiency yet. After entry, confirm rotor RPM is in the green arc, airspeed is approaching 60 knots [adjust for aircraft type], and you have positive aircraft control.”

9. Demonstrate ground reference selection technique on the ground: “Before we fly, let’s look at the sectional and identify our ground references. We’ll be operating in this practice area [point to map]. I want you to identify four references: one for our initial ground track, one 90 degrees left or right, one at 180 degrees, and one at 270 degrees. In flight, before entering the autorotation, we’ll overfly or position ourselves so these references are clearly visible. During the maneuver, you’ll fly toward the 90-degree reference, then the 180-degree reference, confirming your ground track visually. If the wind is strong, you’ll see yourself drifting and will need to adjust heading to stay on track toward those references. This is navigation during an emergency—critical commercial pilot skill.”

10. Explain the two methods in detail: “Method one is two 90-degree turns in the same direction. After entry and stabilization, at about 600 to 650 feet AGL, roll into your first turn using 15 to 20 degrees of bank. Coordinate with pedal—this isn’t a slip or skid; it’s a coordinated turn in autorotation. Monitor ground track toward your 90-degree reference. When you achieve 90 degrees of ground track change—verified by your ground reference, not a heading—roll wings-level briefly, maybe three to five seconds. This gives you a moment to reassess energy state, verify rotor RPM, and confirm your next ground reference. Then roll into the second turn in the same direction—another 15 to 20 degrees bank. Monitor ground track toward the 180-degree reference. At 350 to 400 feet AGL, initiate your roll-out so you’re wings-level by 300 feet. Method two is one continuous 180-degree turn: same entry, but instead of two separate turns, you establish the bank angle and hold it throughout the 180-degree ground track change. This requires more consistent wind drift compensation because you’re turning continuously. Some pilots find it smoother; others prefer the two-turn method because the brief wings-level moment provides a mental reset. Both are acceptable—use whichever you can perform more precisely.”

11. Emphasize altitude awareness techniques: “During this maneuver, you must cross-check your altimeter every two to three seconds—not a casual glance, but deliberate altitude awareness. I teach students to make verbal callouts even when solo: ‘700 feet, entering first turn,’ ‘600 feet, turn established,’ ‘500 feet, rolling out of first turn,’ ‘450 feet, entering second turn,’ ‘350 feet, rolling out now,’ ‘300 feet, wings level.’ These callouts create habit patterns and force you to look at the altimeter. On a check ride, the evaluator is watching to see if you’re altitude-aware or if you’re fixating outside. Altitude management is a primary grading criterion.”

12. Teach wind drift compensation: “Here’s a concept that’s challenging until you visualize it: your ground track will curve downwind if you fly a constant heading. [Use model helicopter and move it over a map while maintaining constant nose direction, showing ground track arcing downwind.] To fly a specific ground track arc, you must continuously adjust heading to compensate for wind. Strong crosswind means you’ll turn into the wind throughout the maneuver. Here’s the key: forget the heading indicator during this maneuver. Look outside, verify you’re tracking toward your ground reference, and adjust as needed. If you’re drifting away from the reference, turn more into the wind. If you’re tracking perfectly, hold what you have. This is pilotage during an emergency—old-school VFR navigation combined with energy management.”

13. Describe power recovery procedure: “If at any point you recognize you will not complete roll-out by 300 feet AGL—or if rotor RPM, airspeed, or aircraft control becomes unsatisfactory—immediately execute power recovery. Roll wings-level if in a turn, smoothly increase throttle to operating RPM or climb power, raise collective to arrest descent and establish positive rate of climb while coordinating left pedal, and apply cyclic for climb airspeed. Monitor rotor RPM throughout—it must stay in the green arc. On a practical test, if you initiate power recovery before 300 feet because you recognize you’re behind the maneuver, that demonstrates good judgment even though the Task is incomplete. Continuing the turn below 300 feet hoping to ‘make it work’ demonstrates poor judgment and is an immediate failure.”

14. Conduct pre-flight briefing in detail: “Before we fly, let’s brief the entire maneuver step by step. We’ll depart to the north practice area, establish 1,000 feet AGL over the open fields east of the highway. Winds today are 280 at 12 knots, so I’m choosing 1,000 feet AGL entry instead of 700 minimum—that’s good commercial judgment given near-15-knot winds. We’ll identify four ground references: that north-south road for our initial track heading north, the section line running east-west for our 90-degree reference, the parallel road to the south for our 180-degree reference, and the tree line for 270 degrees. After clearing turns, I’ll demonstrate one complete autorotation with two 90-degree turns to the right, calling out altitudes and control inputs. Then you’ll practice. Any questions before we preflight?”

15. Demonstrate the complete maneuver in flight with detailed narration: [In flight] “We’re established at 1,000 feet AGL, airspeed 80 knots, level flight. I’ve identified my ground references—initial track is north following that road below us, 90-degree reference is the section line to the east, 180-degree reference is the road to the south. Completing clearing turns now… clear left, clear right, no traffic. Simulated engine failure NOW. [Execute] Throttle to flight idle, collective full down, right pedal to maintain heading, cyclic forward to establish 60 knots. Rotor RPM in green arc, descent established, 900 feet AGL. I’m looking ahead to my 90-degree reference—that section line to the east. At 650 feet I’m rolling into my first turn to the right, 20 degrees bank, coordinated pedal. Descent rate increases—I’m now descending about 1,800 feet per minute instead of 1,500. Tracking toward my reference, making small heading adjustments for wind. 550 feet AGL, I’ve completed 90 degrees of ground track—I’m aligned with that section line. Rolling wings-level briefly to check energy. RPM is good, airspeed 60 knots, 500 feet AGL. Rolling into second turn to the right, same 20-degree bank. Now tracking toward my 180-degree reference—that road to the south. 400 feet AGL, I’m initiating roll-out now—cyclic left, releasing pedal pressure. 350 feet AGL, wings are level, I’m aligned with my 180-degree reference ground track. 300 feet AGL, maneuver complete, applying power: throttle up smoothly, collective up to arrest descent and establish climb, left pedal, cyclic for climb airspeed. Rotor RPM in green arc throughout recovery. That’s the complete maneuver. Notice I called out every altitude, monitored ground references constantly, and rolled out early enough to be wings-level well before 300 feet. Any questions before you try?”

16. Provide coaching during student practice: [During student practice] “Good entry, collective is fully down, rotor RPM is stable. You’re at 650 feet—time to begin your first turn. Roll into it… that’s 15 degrees, could go slightly steeper if you want 20. Good pedal coordination. Now look at your ground reference—are you tracking toward it? You’re drifting left of the section line. Add right heading correction… better. You’re at 550 feet and about 70 degrees through the turn—you need to complete this first 90 degrees soon or you’ll run out of altitude for the second turn. Little more bank. Good, there’s your 90-degree point. Roll out… wings level. Quick check: 480 feet AGL, RPM is good, airspeed is good. Now immediately into your second turn—don’t delay. Roll right again. You’re at 400 feet—you have about 100 feet to complete this turn and roll out. Watch your ground track… good. 350 feet, start rolling out NOW. Release the bank… pedal out. 320 feet, you’re nearly wings level… 300 feet, wings level. Maneuver complete—that was tight on the second turn. Let’s debrief what happened after you apply power.”

17. Provide specific corrections during practice: “On that attempt, you delayed the first turn until 550 feet AGL, which gave you only 250 feet for both turns and roll-out. That’s cutting it too close. On the next iteration, initiate the first turn at 600-650 feet so you have adequate altitude margin. Also, I noticed you were looking at the heading indicator instead of ground references during the turn. The heading indicator is almost useless in this maneuver because wind drift changes the heading required for a given ground track. Eyes outside, reference the ground, adjust heading to track toward your visual reference points.”

18. Evaluate maneuver against ACS standards: [After student completes successful iteration] “Let’s evaluate that against the ACS standards for Task CH.XIV.C. You entered at 900 feet AGL, which exceeds the 700-foot minimum—good judgment given the winds. You completed two 90-degree turns in the same direction with respect to ground track, verified by your ground references—that meets the turn requirement. You rolled out at 340 feet AGL, which is 40 feet above the 300-foot hard deck—you met the roll-out requirement. Rotor RPM remained in the green arc throughout. That maneuver met ACS standards and would be satisfactory on a practical test.”

19. Debrief after flight session: “Today you practiced autorotation with turns and successfully completed the maneuver to ACS standards on your final two attempts. The key learning points: first, plan the maneuver backward from the 300-foot roll-out altitude to ensure you have time to complete both turns. Second, use ground references exclusively for ground track—forget the heading indicator. Third, establish personal minimums like ‘roll-out by 350 feet’ to build safety margin. Areas to continue improving: slightly earlier initiation of the first turn to reduce time pressure, and smoother roll-in and roll-out to minimize altitude loss during the transitions. Your rotor RPM management was excellent—you kept it in the green arc even during the turns, which shows you understand the energy management component. Questions about anything we covered today?”

20. Assign post-flight study and practice: “Before our next session, I want you to review ACS Task CH.XIV.C and chair-fly this maneuver at least three times. Sit in a chair, visualize the aircraft at 700 feet AGL, verbally describe your control inputs, and call out altitudes as you mentally descend: ‘650 feet, rolling into first turn,’ ‘550 feet, rolling out,’ ‘500 feet, second turn,’ ‘350 feet, rolling out,’ ‘300 feet, wings level.’ This mental rehearsal builds the altitude awareness and timing you need. Also, draw ground track diagrams on paper showing different wind conditions and how you’d need to adjust heading to achieve your ground track changes. Understanding wind drift intellectually makes it easier to apply in flight. Next session we’ll practice this maneuver with different wind conditions and combine it with other commercial maneuvers in a simulated practical test scenario.”

Student Actions

1. Review pre-flight materials: Student reviews ACS CH.XIV.C, Helicopter Flying Handbook Chapter 11 (Helicopter Emergencies), and POH/RFM autorotation procedures before the flight lesson. Student prepares questions about operational requirements, turn procedures, or altitude management for discussion with instructor.

2. Participate in ground briefing: Student actively engages in discussion of regulatory requirements (700 ft AGL minimum, 300 ft roll-out mandate), aerodynamic principles of turning autorotations, and risk management strategies. Student asks clarifying questions about ground track versus heading, wind drift compensation, or altitude management techniques.

3. Conduct aircraft preflight inspection: Student performs thorough preflight inspection per manufacturer’s checklist, with special attention to flight controls (full range of motion without binding), rotor system (no damage or excessive play), engine and drivetrain (oil levels, belt condition), and instruments (altimeter setting confirmed, all instruments operational). Student confirms sufficient fuel for 1.5 hours flight time including reserves.

4. Identify ground references: Before departure or during transit to practice area, student identifies and briefs four distinct ground references for 0°, 90°, 180°, and 270° ground tracks. Student explains to instructor why each reference is suitable (sufficient contrast, proper distance, readily identifiable from altitude).

5. Perform pre-maneuver checks: Student establishes aircraft at briefed altitude (700 feet AGL minimum or higher based on winds), appropriate airspeed, and level flight configuration. Student completes clearing turns in both directions and verifies no traffic or hazards in the maneuver area. Student confirms suitable forced landing areas are available throughout 360-degree area.

6. Observe instructor demonstration: Student observes instructor’s complete demonstration of autorotation with turns, noting control inputs, altitude callouts, ground reference use, timing of turn initiation and roll-out, and power recovery technique. Student asks questions during post-demonstration debrief about techniques observed.

7. Execute autorotation entries: Student performs autorotation entry on instructor command by smoothly reducing throttle to flight idle, simultaneously lowering collective fully to maintain rotor RPM in green arc, applying right pedal to maintain heading, and establishing autorotative airspeed (typically 60-70 KIAS depending on aircraft type) with cyclic. Student completes entry within 2-3 seconds demonstrating commercial-level precision.

8. Manage altitude awareness: Student cross-checks altimeter every 2-3 seconds throughout the maneuver and makes verbal altitude callouts (“700 feet,” “600 feet,” “500 feet,” etc.). Student uses altitude information to plan turn timing and roll-out initiation.

9. Perform turning maneuver using ground references: Student executes either two 90-degree turns in the same direction OR one continuous 180-degree turn, using visual ground references to verify ground track change (not heading change). Student maintains 15-20 degrees bank angle, coordinates turns with appropriate pedal input, and makes continuous heading adjustments to compensate for wind drift and track toward selected ground references.

10. Manage rotor RPM during turns: Student monitors rotor RPM continuously during roll-in, established turn, and roll-out phases. Student makes small collective or cyclic adjustments as needed to maintain RPM in green arc, understanding that slight RPM increase during roll-in and slight decrease during roll-out are normal and must be anticipated.

11. Execute timely roll-out: Student initiates roll-out from final turn no later than 350-400 feet AGL to ensure wings-level configuration is achieved by 300 feet AGL. Student uses cyclic to roll wings-level and coordinates with pedal to maintain ground track alignment. Student verifies wings-level and altitude by 300 feet AGL.

12. Perform power recovery: Student executes smooth power recovery after completing roll-out by 300 feet AGL (or earlier if directed by instructor or if energy state becomes unsatisfactory). Student rolls wings-level if still in turn, increases throttle smoothly to operating RPM/climb power, raises collective to arrest descent and establish climb while coordinating left pedal, and applies cyclic for climb airspeed. Student maintains rotor RPM in green arc throughout recovery.

13. Demonstrate appropriate decision-making: If student recognizes they will not complete roll-out by 300 feet AGL, student voluntarily initiates power recovery before reaching the hard deck, demonstrating sound aeronautical decision-making and risk management. Student verbalizes decision to instructor: “I’m at 350 feet and won’t complete the roll-out by 300—applying power now.”

14. Self-critique performance: After each iteration, student analyzes own performance: “I initiated the turns late, which made the second turn rushed,” or “My ground track was good but I let rotor RPM get too high during the first roll-in.” Student identifies specific areas for improvement before next attempt.

15. Respond to instructor coaching: Student implements instructor corrections and coaching during subsequent practice iterations. If instructor identifies a technique error, student adjusts approach on next attempt and confirms understanding: “On this attempt I’ll start the first turn at 650 feet instead of 550 to give myself more altitude margin.”

16. Practice to proficiency: Student repeats the maneuver multiple times during the lesson, demonstrating progressive improvement in altitude management, ground track precision, rotor RPM control, and roll-out timing. Student performs at least two consecutive iterations meeting full ACS standards before conclusion of lesson.

17. Engage in post-flight debrief: Student participates in thorough debrief, discussing what techniques worked well, what needs improvement, and how performance compared to ACS standards. Student takes notes on instructor feedback for post-flight study and chair-flying practice.

18. Complete post-flight responsibilities: Student assists with aircraft securing, completes logbook entries documenting autorotation with turns training, and reviews ACS standards to self-assess readiness for practical test. Student asks instructor for endorsement when proficiency is demonstrated consistently.

Completion Standards

The lesson is complete when the student demonstrates comprehensive understanding of operational requirements and consistently performs autorotation with turns to the standards specified in Commercial Pilot Helicopter ACS Task CH.XIV.C. Specifically, the student must:

Knowledge Standards:

• Explain the 700 feet AGL minimum entry altitude requirement and articulate when a “suitable higher entry altitude” is necessary based on strong wind conditions (typically winds >15 knots, gusty conditions, wind shear, or high-density altitude operations)
• Describe the turn requirements: two 90-degree turns in the same direction OR one continuous 180-degree turn, with emphasis that these angles refer to ground track change, not heading change
• State the mandatory 300 feet AGL roll-out altitude and explain the consequences of failure to meet this requirement (evaluator-directed power recovery and unsatisfactory Task grade)
• Explain how turning increases descent rate compared to straight autorotation due to reduced vertical component of rotor thrust and increased load factor
• Describe risk management strategies including conservative entry altitude selection, personal minimums for roll-out initiation (e.g., 350 ft), ground reference use, and anticipatory rotor RPM management

Skill Standards (must meet ALL criteria consistently):

1. Entry altitude: Enter autorotation above 700 feet AGL minimum; select higher altitude (900-1,000+ feet AGL) when winds exceed 15 knots, gusty conditions exist, or other factors (density altitude, turbulence, pilot proficiency level) warrant additional margin
2. Entry technique: Execute smooth, immediate autorotation entry within 2-3 seconds: throttle to flight idle, collective fully down, right pedal coordination, establishment of autorotative airspeed (±5 knots of target)
3. Rotor RPM management: Maintain rotor RPM within green arc throughout entry, turns, and roll-out; make anticipatory corrections for RPM increases during roll-in and decreases during roll-out
4. Turn execution: Perform either:
   • Two 90-degree turns in the same direction with respect to ground track (verified by ground references), with brief wings-level stabilization (3-5 seconds) between turns, OR
   • One continuous 180-degree turn with respect to ground track (verified by ground references) using consistent bank angle throughout
5. Bank angle: Maintain coordinated turns using 15-25 degrees bank angle; ball centered within one diameter throughout turns
6. Ground track precision: Track toward selected ground references; compensate for wind drift throughout maneuver to achieve planned ground track changes (±10 degrees of intended track)
7. Altitude management: Roll out of final turn and achieve wings-level attitude by 300 feet AGL (absolute requirement—failure is unsatisfactory)
8. Airspeed control: Maintain autorotative airspeed ±10 knots throughout maneuver
9. Power recovery: Execute smooth power recovery (if maneuver completed to 300 ft AGL) or immediate power recovery (if unable to complete roll-out by 300 ft) with proper technique: wings level, throttle increase, collective raise with left pedal coordination, climb airspeed established, rotor RPM maintained in green arc
10. Aeronautical decision-making: Demonstrate sound judgment in selecting entry altitude based on conditions, recognizing when maneuver cannot be completed successfully, and initiating power recovery before 300 ft AGL if necessary

Consistent Performance Requirement: Student must perform at least two consecutive iterations meeting all skill standards above without instructor intervention. Performance must demonstrate commercial pilot precision and professionalism, not merely private pilot minimum standards.

Areas of Unsatisfactory Performance (any one results in lesson incompletion):

• Entry below 700 feet AGL without justification for conditions
• Failure to complete roll-out by 300 feet AGL
• Rotor RPM excursion outside green arc
• Uncoordinated turns (ball more than one diameter deflection sustained)
• Less than 180 degrees total ground track change
• Turning in opposite directions for two-90-degree-turn method
• Inability to identify or use ground references for ground track verification
• Altitude deviations exceeding ±50 feet from planned altitude callouts (indicates inadequate altitude awareness)
• Unsafe power recovery technique (rotor RPM outside limits, loss of aircraft control, inadequate obstacle clearance if applicable)

Instructor Endorsement Criteria: Upon successful completion of this lesson with consistent demonstration of all standards above, the instructor will provide logbook endorsement: “Autorotation with turns per Commercial Pilot Helicopter ACS CH.XIV.C—demonstrated to ACS standards on [date].” This endorsement confirms the student is prepared for practical test evaluation of this specific task. Final practical test readiness requires integration of this maneuver with other ACS tasks and overall commercial pilot proficiency demonstration.