Approach and Landing with One Engine Inoperative (OEI) (Simulated) (Multiengine Helicopter Only)

Objective

The student will demonstrate understanding of and proficiency in conducting a stabilized approach and landing with one engine inoperative (simulated) in a multiengine helicopter, maintaining the operating powerplant within OEI limits, adhering to a planned flightpath considering environmental factors and obstructions, and completing the landing with appropriate directional control while meeting commercial pilot Airman Certification Standards (ACS) CH.X.C performance tolerances of altitude ±100 feet, airspeed ±10 knots, heading ±5° during the approach segment, and successful completion of the landing with no drift at touchdown.

Content

Regulatory Foundation

14 CFR 61.133 — Commercial pilot privileges allow pilots to act as pilot in command of an aircraft carrying persons or property for compensation or hire, making proficiency in emergency procedures essential for professional operations. Multiengine helicopter operations require specific training per 14 CFR 61.63(c) before acting as PIC in a multiengine helicopter.

14 CFR 91.3 — The pilot in command is directly responsible for and is the final authority for the operation of the aircraft. In an OEI scenario, this responsibility includes immediate recognition, proper response, and safe aircraft handling to a landing.

Elements of Approach and Landing with OEI

Engine Failure Recognition and Initial Response: When one engine fails in a multiengine helicopter, immediate recognition is critical. Unlike single-engine helicopters where power loss leads to autorotation, multiengine helicopters provide continued powered flight capability on the remaining engine—but with significant limitations. The operating engine must compensate for both lift and anti-torque requirements, fundamentally changing aircraft performance and handling characteristics.

Critical considerations include:

• Immediate yaw tendency toward the failed engine due to loss of its anti-torque contribution
• Significant power deficit — the remaining engine cannot produce the same total power as both engines combined
• OEI power limits — maximum contingency power (30 seconds), maximum continuous OEI power (typically 2.5 minutes), and continuous OEI power ratings
• Reduced climb capability or descent requirement depending on density altitude, gross weight, and configuration
• Increased fuel consumption on the operating engine due to higher power requirements

OEI Approach Planning Elements: The approach with OEI differs fundamentally from a normal two-engine approach because the pilot must manage a compromised aircraft within strict operational limits while maintaining a safe energy state throughout.

Key planning factors:

1. Power management — The operating engine must remain within OEI limits throughout the approach. Exceeding 30-second or 2.5-minute contingency limits requires immediate action and may limit subsequent power availability.
2. Glide performance — Unlike normal approaches where power can compensate for poor planning, OEI approaches require precise energy management. An undershoot may leave insufficient power to correct; an overshoot wastes critical altitude.
3. Landing area selection — Must be large enough to accommodate reduced maneuverability and longer landing roll. Confined areas suitable under normal operations may be unsuitable with OEI.
4. Go-around capability — Go-around may not be possible depending on density altitude, weight, and available power. The approach must be treated as committed once below a certain altitude.

Effects of Atmospheric Conditions on Emergency Approach and Landing

Density Altitude Impact: Density altitude affects OEI performance dramatically because the operating engine produces less power at high density altitudes while the helicopter requires more power to maintain flight. An OEI approach in high-density-altitude conditions may require a continuous descent to maintain airspeed due to insufficient power to maintain level flight.

Commercial pilots must calculate:

• OEI ceiling — maximum altitude at which level flight can be maintained on one engine
• OEI rate of descent — expected descent rate if level flight cannot be maintained
• Power-required versus power-available — understanding the performance deficit at current conditions

Wind Effects: Wind significantly affects OEI approach planning:

• Headwind component — Provides better energy management, shorter landing roll, more time to assess landing area
• Tailwind component — Increases groundspeed, reduces margin for error, lengthens landing roll, and complicates flare timing
• Crosswind — Requires additional tail rotor thrust (power) for directional control, potentially exceeding OEI power limits during landing
• Wind shear and gusts — Require power reserves that may not be available in OEI conditions

Temperature and Pressure: High temperature reduces engine power output and increases power required for flight. Low-pressure conditions reduce air density with similar effects. The combination creates compounding performance degradation. Commercial pilots must understand that conditions acceptable for normal operations may be prohibitive for OEI approaches.

Stabilized Approach

A stabilized approach is one where the helicopter is configured for landing, on a predetermined flightpath and airspeed, with the rate of descent under control, requiring only minor adjustments to maintain the approach profile. In OEI operations, the stabilized approach becomes a non-negotiable safety requirement because power reserves for corrections are severely limited or nonexistent.

Stabilized Approach Criteria for OEI:

• Established on final approach course by 300 feet AGL minimum
• Target airspeed ±5 knots (tighter than normal ±10 knots due to limited correction capability)
• Rate of descent appropriate for approach angle (typically 300-500 fpm)
• Operating engine within continuous OEI power limits
• Configuration stabilized (gear down if retractable, approach-to-landing configuration)
• Landing area positively identified and assured

Unstabilized Approach Recognition: If any of the following exist below 300 feet AGL, execute a go-around if power permits, or immediately transition to best available landing area:

• Excessive airspeed deviation (>10 knots)
• Approach angle too steep or too shallow
• Operating engine parameters approaching or exceeding limits
• Alignment with landing area uncertain
• Sink rate excessive or uncontrolled

Commercial pilots must develop the discipline to abandon poorly planned approaches early when corrective action is still possible, rather than attempting to salvage an unstabilized approach when power reserves are exhausted.

Approach and Landing Profiles and Aircraft Configuration

High-Performance OEI Approach (Recommended Method): This approach maximizes safety margins by maintaining translational lift throughout the approach and touching down with forward groundspeed.

Profile elements:

1. Pattern altitude — 500-700 feet AGL, considering OEI ceiling limitations
2. Downwind configuration — Establish cruise airspeed, verify operating engine parameters normal, complete OEI landing checklist
3. Base turn — Begin descent, decelerate to approach speed (typically 60-80 KIAS depending on aircraft type)
4. Final approach segment — Stabilized by 300 feet AGL at approach airspeed, descent rate controlled, aligned with landing area
5. Termination — Decelerate to minimum safe speed (typically 40-50 KIAS) in ground effect, cushion touchdown with collective, land with minimal forward speed but maintaining translational lift benefits until surface contact

Configuration Considerations:

• Airspeed selection — Balance between performance (higher speed = more rotor efficiency) and landing roll distance (lower speed = shorter roll)
• Collective position — Must have sufficient collective travel available to arrest descent in flare while keeping operating engine within limits
• Cyclic position — Maintain neutral-to-slightly-aft position on final to allow flare capability without aft cyclic limitations
• Pedal position — Anticipate increased pedal requirement during flare as power increases for deceleration

Angle of Approach: The approach angle must be shallower than normal autorotation approaches (typically 8-12 degrees versus 12-16 degrees) because:

• Flare energy comes from both rotor inertia AND available power
• Steeper approaches require more aggressive flares, consuming more power
• Shallow approaches provide more time to assess landing area and make minor corrections
• Power-limited conditions may not support steep approach recovery

Risk Management Considerations

Altitude, Wind, Terrain, Obstructions, and Available Landing Area:

The commercial pilot must develop comprehensive situational awareness of all environmental factors simultaneously. Unlike private pilot operations where conservative decision-making suffices, commercial operations require accurate assessment and professional judgment about what is acceptable.

Risk management matrix for OEI approaches:

• Altitude available — Higher altitude provides more options and energy; low altitude demands immediate commitment to a landing area. Minimum decision altitude should be briefed (“Below 500 feet, we are committed to Area A”).
• Wind assessment — Know current winds at altitude and surface, anticipate differences. Direct crosswind component exceeding 50% of demonstrated crosswind capability should trigger alternate landing area selection.
• Terrain evaluation — Rising terrain reduces abort options; descending terrain increases them but complicates visual references. Flat terrain is optimal for OEI landings.
• Obstruction identification — Wires, towers, trees, vehicles, and other obstacles must be identified early and specifically avoided in the flight path. Unlike normal operations where power can clear obstacles, OEI approaches cannot accept any obstruction in the flight path.
• Landing area suitability — Surface must be firm, level, and large enough for landing roll. Confirm area is free of people, animals, and debris. A smaller area that’s closer and assured is preferable to a larger area that requires maneuvering to reach.

Planning and Following a Flightpath:

The commercial pilot must brief the OEI approach plan before the approach begins, including:

• Selected landing area with alternate if go-around becomes necessary
• Pattern entry point and altitude
• Decision points (“If not stabilized by 300 feet, transition to Area B”)
• Expected operating engine parameters throughout approach
• Crosswind correction technique and pedal limitations

Following the planned flightpath requires discipline — deviations must be corrected immediately and decisively because small errors compound rapidly when power is limited. Commercial pilots must resist the temptation to “stretch” the glide or accept an unstabilized approach hoping conditions will improve.

Collision Hazards:

Collision risks during OEI approaches include:

• Other aircraft — Reduced maneuverability limits ability to avoid traffic; ATC coordination essential
• Ground obstacles during approach — Wires and towers may be difficult to see; brief known obstacles before approach
• Dynamic rollover during landing — Crosswind landings with OEI increase dynamic rollover risk due to limited power for correction if skid contact is uneven
• Tail rotor contact — Gusty or crosswind conditions may require pedal inputs near limits; tail rotor strike possible if wind shifts during landing

Mitigation strategies:

• Make clear and frequent radio position reports
• Request traffic advisories from ATC
• Brief all known obstacles with specific altitudes and distances
• Plan landing to minimize crosswind component at touchdown
• Maintain positive aircraft control throughout landing rollout

Distractions, Task Prioritization, Loss of Situational Awareness, Disorientation:

The increased workload of OEI approaches makes distraction management critical. Commercial pilots must develop systematic scan patterns and priority frameworks.

Task prioritization hierarchy:

1. Aircraft control — Maintain attitude, airspeed, and rotor RPM within limits
2. Flightpath management — Follow planned approach profile to selected landing area
3. Power management — Monitor and maintain operating engine within OEI limits
4. Communication — Radio calls and coordination as workload permits

Common distractions during OEI approaches:

• Fixation on engine instruments instead of maintaining visual references
• Attempting excessive communication when workload is already high
• Passenger or crew questions/concerns during critical phases
• Attempting to troubleshoot the failed engine instead of managing the approach
• Photography or documentation of the emergency

Situational awareness maintenance:

• Verbalize position, altitude, and plan at regular intervals
• Cross-check visual picture with instrument indications
• Maintain orientation to landing area throughout approach
• Brief “lost sight of landing area” procedures before beginning approach

Disorientation prevention: In OEI approaches, spatial disorientation risk increases due to unusual aircraft attitudes (potential yaw), high workload, and stress. Commercial pilots must:

• Trust flight instruments if visual references become unclear
• Maintain disciplined scan between outside references and instruments
• Recognize early signs of disorientation (conflicting perceptions, vertigo sensations)
• Execute immediate missed approach if disorientation occurs and altitude permits

Operating Powerplant Within OEI Limits

Understanding OEI Power Ratings: Multiengine helicopter engines have distinct power ratings for OEI conditions:

1. 30-Second OEI Rating — Maximum contingency power for initial engine failure response, obstacle clearance, or critical maneuvering. Exceeding 30 seconds may require engine inspection or component replacement.

2. 2.5-Minute OEI Rating — Intermediate contingency power for maneuvering to landing area or attempting restart. Allows higher power than continuous OEI but with time limitation.

3. Continuous OEI Rating — Maximum power that can be sustained indefinitely on one engine. This is the target power setting for OEI approaches and landings.

Power Management During Approach: The commercial pilot must continuously monitor:

• Engine torque (primary power indicator)
• Turbine outlet temperature (TOT) or exhaust gas temperature (EGT)
• Engine RPM (N1, Ng)
• Transmission oil temperature and pressure
• Rotor RPM

Critical power management points:

• Initial descent — Reduce power smoothly to maintain continuous OEI limits; avoid rapid collective reductions that may cause rotor RPM decay
• Approach segment — Target 60-75% of continuous OEI power to maintain margin for corrections
• Flare — Plan flare to require no more than 90% continuous OEI power; if more power is needed, landing area selection was incorrect
• Touchdown — Smoothly reduce collective to minimum as skids contact surface

Power Limit Exceedances: If operating engine limits are exceeded during approach:

• Immediately reduce collective to restore limits
• Accept increased descent rate rather than operate beyond limits
• Adjust landing point to accommodate higher sink rate
• If limits cannot be maintained, execute emergency landing to nearest suitable area

Checklists and Procedures

OEI Landing Checklist (Generic — use aircraft-specific checklist in actual operations):

1. Mayday call (if actual emergency) or simulated call (if training)
2. Operating engine parameters — VERIFY NORMAL
3. Failed engine — SECURE (close fuel valve, secure ignition as applicable)
4. Hydraulics — CHECK (may have reduced hydraulic pressure)
5. Landing area — SELECTED AND BRIEFED
6. Airspeed — APPROACH SPEED
7. Configuration — LANDING
8. Passenger brief — COMPLETE

Radio Calls: Commercial pilots must communicate clearly and professionally:

• Initial call: “[Callsign], simulated engine failure, VFR, maneuvering for precautionary landing at [location], request traffic advisories”
• Pattern calls: “[Callsign], OEI approach, left downwind/base/final runway [XX or area description]”
• Final call: “[Callsign], OEI landing assured, runway [XX], helicopter”

Crosswind Correction and Directional Control

OEI Crosswind Challenges: With one engine inoperative, the anti-torque requirements change significantly. The operating engine produces torque that must be countered, but the failed engine’s contribution to yaw control is absent.

Crosswind Technique:

• Approach: Maintain ground track with cyclic drift, use pedals only for heading/yaw control
• Final approach: Align fuselage with landing direction using coordinated cyclic and pedal inputs
• Flare: Anticipate increased pedal requirement as power increases; be prepared for pedal limit
• Touchdown: If crosswind exceeds pedal authority for aligned touchdown, accept slight drift rather than forcing alignment beyond pedal limits

Directional Control Priorities:

1. Maintain rotor RPM in normal operating range
2. Prevent yaw oscillations through smooth pedal inputs
3. Keep fuselage aligned with approach path
4. Accept minor drift to avoid pedal limit during landing

Single-Pilot Resource Management (SRM)

Workload Management: OEI approaches create high workload periods. Commercial pilots must:

• Complete checklist items during lower-workload segments (downwind/base)
• Minimize radio communication during final approach segment
• Reject attempts at troubleshooting failed engine during approach
• Focus solely on aircraft control and landing execution below 300 feet AGL

Decision Making:

• Use structured decision-making: Recognize, analyze, decide, act
• Brief decision points before beginning approach
• Commit to briefed actions when decision points are reached
• Avoid second-guessing decisions during critical phases

Schedule

Equipment

Required References:

• FAA-S-ACS-16, Commercial Pilot — Helicopter Airman Certification Standards (current edition)
• FAA-H-8083-21B, Helicopter Flying Handbook
• Aircraft Pilot’s Operating Handbook (POH) or Rotorcraft Flight Manual (RFM), specifically OEI performance section
• 14 CFR Parts 61 and 91 (current)
• FAA-H-8083-2, Risk Management Handbook

Required Materials:

• Aircraft appropriate for multiengine helicopter training with one engine capable of being simulated as inoperative
• Approved engine securing procedures (throttle roll-off, simulated fuel cut-off, or other approved method)
• Current sectional chart for practice area
• Aviation calculator or electronic flight computer
• Fuel calculation tools
• Weight and balance computation materials

Visual Aids and Training Materials:

• Whiteboard or tablet for diagramming approach profiles
• Power-required/power-available performance charts for aircraft type
• OEI performance limitation charts
• Sample approach diagrams showing stabilized vs. unstabilized profiles
• Crosswind landing technique illustrations
• Engine instrument limit placards or reference cards
• Video examples of OEI approaches (if available)

Safety Equipment:

• Current weather briefing for practice area
• Designated landing areas identified and briefed
• Communication equipment functional and tested
• Emergency equipment per aircraft requirements

Instructor Actions

1. Begin with motivation and objective review. Explain: “Today we’re adding one of the most critical multiengine helicopter skills to your commercial certificate — the OEI approach and landing. This isn’t just about passing a checkride. When you’re flying commercial operations — tourists, EMS, utility work — engine failures happen. The statistics show that multiengine helicopters with trained pilots have dramatically better outcomes in OEI scenarios than pilots who haven’t maintained proficiency. You already know how to fly approaches from your private training. Today we’re raising the bar to commercial precision while managing a compromised aircraft.”

2. Introduce the aerodynamic reality of OEI flight. Explain: “Think about what happens when one engine quits in a twin. You don’t just lose 50% of your power — you lose more than that because the operating engine now has to do ALL the anti-torque work plus provide ALL the lift. In some conditions, the remaining engine simply cannot maintain level flight. Your job is to recognize this immediately and plan accordingly. We’re not talking about hoping you’ll make it to your intended destination — we’re talking about professional decision-making to get the aircraft safely on the ground.”

3. Demonstrate power limit calculation using current conditions. Walk through: “Let’s look at our actual numbers today. Outside air temperature is [XX], pressure altitude is [XXXX]. Looking at the OEI performance chart, our maximum continuous OEI power is [XX]% torque at [XXX] degrees TOT. That’s our ceiling — we cannot exceed this for more than the briefed contingency time. Now, looking at the power-required chart at our current weight, maintaining level flight requires [XX]% torque. That means we have [XX]% margin. If we had no margin, we’d be in a continuous descent scenario. Always do this math before you brief OEI approaches.”

4. Present approach planning framework systematically. Explain each element: “Your OEI approach planning has six non-negotiable components. First, calculate whether level flight is even possible — we just did that. Second, select your landing area considering size, surface, obstacles, wind. Third, brief your pattern entry and specific altitudes. Fourth, identify your decision points — where you commit. Fifth, brief your expected power settings throughout the approach. Sixth, brief your abort plan if one exists. In high-density altitude or heavy-weight operations, you may not have an abort option below a certain altitude. That’s fine, as long as you KNOW that before you start down.”

5. Demonstrate stabilized approach criteria using visual aids. Draw or display approach profile: “A stabilized approach means you’re in landing configuration, on your intended flightpath, at your planned airspeed, with rate of descent controlled, by 300 feet AGL minimum. In OEI work, stabilization is even more critical because you don’t have power reserves to fix mistakes. If you arrive at 300 feet and you’re fast, slow, off-course, or sinking uncontrollably, you must immediately transition to your alternate plan. There’s no ‘I’ll salvage this’ in OEI approaches — you execute what you briefed or you go to Plan B immediately.”

6. Explain atmospheric effects with specific examples. “Temperature matters enormously in OEI work. Every degree above standard temperature costs you power. Hot days that are marginal for normal operations become no-go days for OEI training. Wind is your friend in OEI approaches — headwind gives you more time and better energy management. Tailwind steals both. I want you to develop a rule: if you have options, always plan OEI approaches into the wind. If you don’t have options, adjust your expectations for the wind you have. Crosswind costs you power because pedal deflection creates drag and requires tail rotor thrust. Know your crosswind limits and respect them.”

7. Conduct aircraft-specific systems review. Walk through actual aircraft: “In this aircraft, when we simulate OEI, we’ll [roll off throttle/move fuel condition lever/specific procedure]. The operating engine will show [specific instrument indications]. Your scan must include [list instruments]. The critical limitations are [list limits with specific numbers]. Here’s what I want you to memorize before we fly: continuous OEI torque limit is [XX]%, 2.5-minute OEI limit is [XX]%, 30-second limit is [XX]%. If you see [XX]% or above without my clearance, you’ve exceeded limits — that’s a failure on a checkride and could be an engine failure on the job.”

8. Brief risk management decision framework. “Let’s talk about the accident chain and how we break it. Most OEI accidents happen because pilots accept unstabilized approaches, try to salvage bad approaches, or select unsuitable landing areas. Here’s your commercial pilot mindset: brief two landing areas before you start the approach — primary and alternate. Brief the altitude where you commit to primary. If you’re not stabilized at your briefed decision altitude, you transition to alternate immediately. No analysis, no second-guessing — you execute what you briefed. This decision-making discipline is what separates professional pilots from pilots who become statistics.”

9. Demonstrate collision avoidance planning. “In OEI approaches, your maneuverability is compromised. You cannot make steep turns. You cannot climb rapidly if traffic appears. Therefore, collision avoidance is primarily about planning and communication. Before we begin any OEI approach, we’ll get traffic advisories, make position reports, and visually clear the approach path. If traffic conflicts arise, we’ll delay our approach until separation is assured. You don’t have the luxury of flexibility when you’re OEI — the other aircraft has to give way because you cannot.”

10. Explain task prioritization using concrete scenarios. “When you’re on final approach OEI, your scan priority is: attitude and rotor RPM first, flightpath second, power instruments third, communication fourth. If someone calls you on the radio during short final, ignore it. Aircraft control and landing execution override all other tasks. I’ll help manage communication during your first few approaches, but ultimately you need to develop the discipline to reject distractions during critical phases. This is single-pilot resource management — knowing what matters and when.”

11. Pre-flight: Conduct performance calculation demonstration. Work through actual numbers: “Current density altitude is [XXXX] feet, gross weight is [XXXX] pounds. According to our performance chart, OEI hover requires [XX]% torque. Maximum continuous OEI is [XX]%. We have [XX]% margin. For landing, we’ll need approximately [XX]% to arrest descent in the flare. This is acceptable. If our calculations showed we needed more power than continuous OEI provides, we’d need to plan a running landing or select a different landing area with more headwind component.”

12. Pre-flight: Brief practice area and scenarios. “We’ll fly to [practice area]. I’ve identified three landing areas: Area A is the grass strip, Area B is the dirt access road, Area C is the open field. Wind is [XXX] at [XX] knots, so our preferred approach is Area A from the [direction]. I’ll demonstrate first, then you’ll fly with me talking you through it, then you’ll fly with decreasing coaching. On each approach, we’ll brief the specific scenario — sometimes you’ll have go-around capability, sometimes you won’t. Decision-making changes based on capability.”

13. In flight: Demonstrate OEI approach setup. Verbalize while demonstrating: “I’m establishing the downwind at 700 feet AGL, cruise airspeed. Now I’m simulating the engine failure — rolling off the right throttle [or specific procedure]. Notice the immediate yaw — I’m correcting with pedal. Engine instruments on the operating engine show [call out values]. I’m immediately verifying I’m within continuous OEI limits — torque [XX]%, TOT [XXX], rotor RPM in the green. Now I’m setting up for the approach — I’m decelerating to 70 knots, beginning my descent to intercept final. My aim point is the first third of Area A.”

14. In flight: Demonstrate stabilized final approach segment. Continue verbal demonstration: “I’m now turning base to final. At 500 feet AGL, I want to be at 70 knots, aligned with my landing area, descent rate 400 feet per minute. Watch my aim point — it’s staying fixed in the windscreen, which tells me my flightpath is correct. At 300 feet AGL, I’m checking my stabilization criteria: airspeed 70 knots, check. Aligned with landing area, check. Descent rate controlled, check. Power at 65% torque, well within continuous OEI limits, check. I’m stabilized, so I continue the approach.”

15. In flight: Demonstrate approach termination and landing. Narrate clearly: “Now I’m in ground effect at 50 feet. I’m smoothly reducing my descent rate with collective, but watching my torque — I’m not exceeding 85% at any point. At 20 feet, I’m beginning a gentle flare to reduce forward speed to about 40 knots. As I slow, I need more collective to maintain rotor RPM, but I’m staying within limits. Pedal pressure is increasing as I add collective — that’s normal. Now I’m level at 5 feet, transitioning to descent, and cushioning the touchdown with collective. Skids are on the ground, I’m smoothly lowering collective to flight idle, and we’ve arrived.”

16. In flight: Debrief demonstration. “What did you observe? [Allow student response.] Right — I maintained specific airspeed and rate of descent targets. I called out my power limitations and stayed well below them. I planned the flare to require only [XX]% torque, which I knew I had available. Let me point out what didn’t happen: I didn’t try to stretch the glide. I didn’t accept an unstabilized approach. I didn’t use excessive power hoping I’d make a spot. Professional OEI approaches are about planning and discipline.”

17. In flight: Coach student’s first approach setup. “Okay, you’ve got the aircraft. Establish downwind at 700 feet AGL. Now I’m simulating your engine failure — right throttle rolling off. Immediate pedal correction — that’s it. Verify your operating engine parameters. Call them out to me. Good. Now set up your approach. Where’s your aim point? How’s your altitude? What’s your target speed for base turn?”

18. In flight: Coach approach corrections as needed. “You’re a bit high on base — what are you going to do? Right, shallow your descent slightly. Watch your airspeed — you’re slowing through 65, I want 70. Add a touch of collective, accept the slight climb, re-establish your descent rate. Better. Turning final now — how do your stabilization criteria look? Airspeed? Alignment? Descent rate? Power? You tell me if you’re stabilized or not. At 300 feet, you make the call.”

19. In flight: Monitor approach and provide feedback. Observe carefully: “Good decision to call stabilized — you met all the criteria. Now hold that flightpath. Aim point fixed in the windscreen. Don’t chase it — make small corrections. Watch your torque as you add collective in the flare — you went to 88% there. Not over limits, but that’s higher than we briefed. What would you do differently next time? Right — start the flare slightly earlier or plan a slightly faster touchdown speed. Either one would reduce power requirement.”

20. In flight: Debrief each approach immediately. After landing: “Let’s talk through that approach before we do another one. You were stabilized at 300 feet — that’s the most important success. Your altitude on final varied between 280 and 320 feet — that’s a 40-foot deviation, but ACS allows ±100, so you’re within standards. Airspeed was solid, 68-72 knots throughout. Heading control was excellent. The one area to improve was power management in the flare — let’s discuss technique for that next approach. Ready to try again with that adjustment?”

21. In flight: Progress to reduced coaching. “This time I’m going to let you fly with minimal input from me. Brief your approach, including your decision points. Tell me what you’re going to do and when. Then execute your plan. I’ll only intervene for safety.”

22. In flight: Introduce complexity progressively. “On this next approach, I want you to manage a simulated crosswind component. Wind is [direction and speed]. You’ll need additional pedal deflection during the flare. Brief how you’ll handle it. Also, I’m going to give you a slightly higher approach altitude — 800 feet instead of 700. You decide where to begin your descent. Show me professional decision-making.”

23. In flight: Evaluate ACS standards explicitly. During final approach: “I’m evaluating you against ACS standards right now. Altitude — you’re at 375, tolerance is ±100, you’re slightly below your target but within standards. Airspeed — 72 knots, tolerance is ±10, you’re within standards. Heading — you’re aligned within 3 degrees, tolerance is ±5, within standards. Power — operating engine at 67% torque, continuous OEI limit is 80%, well within limits. You’re meeting commercial standards on this approach.”

24. In flight: Address deficiencies immediately if they occur. If student errors appear: “That approach was not stabilized at 300 feet — your airspeed was 82 knots, which is 12 knots above target and outside the tolerance. What should you have done? Right — call the approach unstable and transition to your alternate landing area. Let’s do it again, and this time I want you to self-critique at 300 feet. If you’re not stabilized, you tell me and we’ll execute the alternate plan. Don’t wait for me to catch it.”

25. In flight: Emphasize risk management scenarios. “On this approach, I’m going to introduce a distraction. Partway down final, I’m going to ask you about your fuel state. Your job is to prioritize correctly — either defer the answer until after landing or give a brief response without disrupting your scan. Let’s see how you handle task saturation.”

26. In flight: Conduct go-around scenario if conditions permit. If power budget allows: “At 200 feet, I want you to execute a go-around. This simulates recognizing an unstabilized approach and having sufficient power to abort. Announce your decision, smoothly add power to maximum continuous OEI, establish a climb or level flight, and maneuver to set up another approach. Key point: verify you’re not exceeding torque limits during the go-around.”

27. Post-flight: Conduct comprehensive debrief. “Let’s review your performance against the ACS standards for Task CH.X.C. You completed four approaches today. On approaches one and two, you met all the skill standards with coaching. On approaches three and four, you met all standards independently. Specifically: you maintained the operating powerplant within OEI limits throughout — your maximum torque was [XX]% and you correctly identified and managed that. You maintained altitude ±75 feet, airspeed ±8 knots, heading ±4 degrees on your final approaches — all within commercial tolerances. You made appropriate radio calls, used your checklist, followed your briefed flightpath, and demonstrated good directional control throughout.”

28. Post-flight: Address risk management performance. “Your risk management showed commercial-level maturity. You correctly briefed decision points before each approach and adhered to them. When your third approach was slightly unstabilized at 300 feet, you recognized it and made the call to continue or adjust — that’s good situational awareness. You identified collision hazards by clearing the approach path visually and making position reports. You managed distractions appropriately by deferring non-critical communication during final approach. One area to develop further: earlier recognition of power trends so you can adjust before approaching limits rather than reacting when you’re near limits.”

29. Post-flight: Assign specific practice items. “Before your next lesson, I want you to chair-fly this entire procedure. Practice verbalizing the approach from downwind through touchdown. Study the OEI performance charts and calculate scenarios at different weights and temperatures. Review the stabilized approach criteria until you can recite them without thinking. When you return, we’ll do approaches in different wind conditions and work on crosswind landing technique refinement.”

30. Post-flight: Answer questions and preview next steps. “What questions do you have about OEI approaches? [Address questions thoroughly.] Next lesson, we’ll combine this with other commercial maneuvers and potentially introduce more complex scenarios like approach to a pinnacle OEI or approach with partial hydraulic failure simulated. Today you’ve demonstrated the foundational skill. Now we’ll build complexity and refine precision. Your performance today shows you’re progressing well toward commercial standards. Keep up the focused practice.”

Student Actions

1. Review assigned reading materials before the lesson. Student arrives having read FAA-H-8083-21B Chapter 11 (Helicopter Emergencies) and reviewed the aircraft’s POH/RFM OEI performance section and emergency procedures.

2. Participate actively in ground instruction. Student asks clarifying questions about OEI aerodynamics, power limits, approach planning, and risk management factors. Student takes notes on critical limitations and procedures specific to the training aircraft.

3. Demonstrate understanding of OEI power calculations. Student works through performance calculations with instructor, demonstrating ability to determine OEI power available versus power required at current density altitude and aircraft weight.

4. Brief approach scenarios thoroughly. Student develops and verbalizes a complete approach briefing including landing area selection, pattern entry, decision points, expected power settings, stabilization criteria, and abort procedures.

5. Complete pre-flight planning. Student calculates weight and balance, reviews current weather, identifies suitable landing areas in practice area, and determines approach profiles considering wind and terrain.

6. Observe instructor demonstration carefully. Student watches instructor’s first demonstration approach, noting power management technique, flightpath control, stabilization verification, and landing execution. Student asks questions after demonstration to clarify observed techniques.

7. Execute approach setup procedures. Student establishes downwind leg at briefed altitude and airspeed, responds immediately to simulated engine failure with appropriate pedal correction, verifies operating engine parameters, and initiates approach planning.

8. Maintain precise aircraft control during approach. Student controls altitude ±100 feet, airspeed ±10 knots, and heading ±5° throughout the approach segment, meeting commercial ACS performance tolerances for CH.X.C.

9. Monitor operating engine parameters continuously. Student scans engine instruments regularly, calls out torque percentage and temperature readings, and maintains operating engine within continuous OEI limits throughout the approach, never exceeding briefed power settings.

10. Verify stabilization criteria at decision point. At 300 feet AGL, student explicitly evaluates and verbalizes stabilization status: configuration verified, on flightpath, airspeed on target, descent rate controlled, power within limits. Student decides whether to continue approach or execute alternate plan based on objective assessment.

11. Follow briefed flightpath to landing area. Student plans and flies a flightpath that considers current wind, terrain, and obstructions, avoiding all obstacles with appropriate clearance and arriving at the selected landing area as planned.

12. Make appropriate radio calls. Student transmits position reports on downwind, base, and final, announces OEI status (or simulated OEI in training), and coordinates with traffic in the practice area. Student prioritizes aircraft control over communication during high-workload phases.

13. Complete aircraft checklists. Student uses the OEI emergency checklist (actual or simulated) to secure the failed engine, verify operating engine parameters, configure the aircraft for landing, and brief passengers if applicable.

14. Maintain directional control throughout approach and landing. Student uses coordinated pedal inputs to control yaw, maintains alignment with landing area centerline or intended path, and applies appropriate crosswind correction technique if wind exists.

15. Execute flare and touchdown with proper technique. Student initiates flare at appropriate altitude to reduce forward speed while maintaining rotor RPM, applies collective smoothly to arrest descent without exceeding OEI power limits, maintains directional control during deceleration, and cushions touchdown with minimal vertical speed.

16. Apply crosswind landing corrections as required. If crosswind exists, student maintains ground track with cyclic, aligns fuselage with landing direction using pedals, and accepts minor drift if necessary to avoid exceeding pedal authority limits, demonstrating appropriate crosswind technique.

17. Demonstrate single-pilot resource management. Student manages workload by completing checklists during low-task phases, maintains situational awareness through systematic scanning, prioritizes tasks appropriately (aircraft control first, communication last), and recognizes and mitigates distractions during critical phases.

18. Self-critique performance after each approach. Student identifies deviations from planned flightpath, airspeed, or power parameters. Student analyzes causal factors for deviations and proposes specific corrections for subsequent approaches.

19. Respond to instructor’s coaching appropriately. Student acknowledges corrections, implements suggested technique changes immediately, and demonstrates learning progression from one approach to the next.

20. Handle introduced distractions professionally. When instructor introduces simulated distractions (questions, equipment issues, etc.), student maintains focus on primary task of aircraft control, defers or briefly addresses distractions, and does not allow situational awareness to degrade.

21. Execute go-around if required. If approach becomes unstabilized or instructor calls for go-around, student immediately adds power (within OEI limits), arrests descent, establishes climb or level flight as power permits, and maneuvers to reposition for another approach or land in alternate area.

22. Demonstrate increasing independence. Student progresses from coached approaches to self-directed approaches, demonstrating ability to plan and execute OEI approaches with minimal instructor input by the end of the lesson.

23. Ask informed questions during debrief. Student seeks clarification on technique points, asks for specific feedback on ACS standard performance, and requests guidance on areas requiring additional practice.

24. Demonstrate commercial pilot judgment. Student makes professional decisions about approach continuation or abortion based on stabilization criteria, recognizes personal limitations, and operates conservatively within established parameters rather than attempting to push limits.

25. Commit to post-flight study and practice. Student acknowledges areas requiring improvement, accepts assigned chair-flying and study tasks, and demonstrates commitment to achieving commercial proficiency standards.

Completion Standards

The lesson is complete when the student demonstrates understanding of all knowledge elements and consistently performs OEI approaches and landings meeting the commercial pilot ACS standards specified in CH.X.C. Specifically, the student must:

Knowledge Standards — Student can explain:

1. All elements of approach and landing with one engine inoperative, including immediate aircraft response to engine failure, aerodynamic changes, power management requirements, OEI power limit categories (30-second, 2.5-minute, continuous), and configuration considerations for OEI flight.

2. Effects of atmospheric conditions on OEI emergency approach and landing, including density altitude impact on power available versus power required, wind effects on approach planning and landing distance, temperature and pressure altitude effects on OEI performance, and performance calculation methods for current conditions.

3. Stabilized approach criteria for OEI operations, including configuration requirements, flightpath stability, airspeed control, rate of descent management, power parameter verification, decision altitude for stabilization check, and unstabilized approach recognition with appropriate responses.

4. Approach and landing profiles for OEI operations, including high-performance approach technique, pattern altitudes and entry procedures, approach angle selection, airspeed management throughout approach phases, flare technique with limited power, and touchdown execution maintaining directional control.

Risk Management Standards — Student demonstrates:

5. Comprehensive consideration of altitude, wind, terrain, obstructions, and available landing area before beginning OEI approach, including briefing minimum of two landing areas (primary and alternate), identifying all known obstacles with specific heights and locations, evaluating wind conditions at altitude and surface, and selecting landing area of adequate size and surface for OEI landing.

6. Systematic planning and adherence to briefed flightpath to the selected landing area, including specific pattern entry point and altitude, decision points identified with actions at each point, expected power settings throughout approach, abort procedures if go-around power is available, and commitment to execute briefed plan without deviation.

7. Effective collision hazard management through requesting traffic advisories from ATC or on CTAF, making clear position reports at downwind, base, and final, visually clearing approach path before beginning final approach, and communicating OEI status to ensure priority handling by other aircraft.

8. Professional management of distractions with appropriate task prioritization maintaining aircraft control as first priority at all times, demonstrating ability to defer or briefly handle non-critical tasks during high-workload phases, recognizing and recovering from loss of situational awareness if it begins to occur, and maintaining orientation to landing area and aircraft state throughout approach.

Skill Standards — Student consistently performs:

9. Maintains operating powerplant within OEI limits throughout the approach and landing, never exceeding continuous OEI torque limit (aircraft-specific value) during steady-state approach, limiting any power excursions above continuous OEI to less than 2.5-minute limit and less than 30 seconds duration, monitoring and calling out engine parameters (torque, temperature, RPM) throughout approach, and demonstrating awareness of remaining power margin at all times.

10. Maintains prior to beginning final approach segment the recommended flight profile within commercial tolerances: altitude ±100 feet of briefed pattern altitude, airspeed ±10 knots of briefed approach speed (typically 60-80 KIAS depending on aircraft), heading ±5° of intended course, and maintains ground track correcting for wind drift.

11. Makes radio calls as appropriate for the operation, transmitting initial OEI advisory with position and intentions, making standard position reports at downwind, base, and final, coordinating with other traffic in practice area, and prioritizing aircraft control over communication during high-workload final approach phase.

12. Plans and follows flightpath to selected landing area demonstrating comprehensive consideration of altitude available for approach planning, wind conditions and their effect on approach profile and landing distance, terrain features requiring flightpath adjustments, obstructions avoided with appropriate clearance (minimum 50 feet), and execution of approach resulting in arrival at selected landing area as briefed.

13. Completes appropriate checklist(s) using aircraft-specific OEI emergency checklist or simulator-approved procedures, securing simulated failed engine per approved training procedures, verifying operating engine parameters throughout approach, completing before-landing checklist items as workload permits, and demonstrating ability to manage checklist without fixation that degrades aircraft control.

14. Maintains directional control and appropriate crosswind correction throughout approach and landing by immediately correcting yaw tendency following simulated engine failure, maintaining coordinated flight with pedal inputs, aligning aircraft with landing direction during final approach, applying appropriate crosswind correction technique (drift or slip as appropriate for phase), landing with fuselage aligned with direction of travel or accepting minor drift if pedal limits approached, and maintaining positive control throughout landing rollout until full stop.

15. Uses single-pilot resource management (SRM) appropriately through systematic scanning between outside references and instruments, managing workload by completing tasks during appropriate flight phases, prioritizing tasks with aircraft control always first priority, recognizing and managing distractions without loss of aircraft control, maintaining situational awareness of position, altitude, airspeed, and aircraft state, and making professional decisions about approach continuation or diversion based on objective criteria.

Overall Performance Standard:

The student consistently demonstrates commercial pilot proficiency in OEI approaches and landings by completing a minimum of three consecutive approaches meeting all ACS tolerances without instructor intervention, demonstrating appropriate risk management through adherence to briefed procedures and decision points, showing professional judgment in approach planning and execution, and maintaining operating engine within limits throughout all approach phases. Performance meets all requirements of ACS CH.X.C for the commercial helicopter practical test.

The student is prepared to progress to more complex OEI scenarios including approaches in varied wind conditions, crosswind landings, approaches to confined areas, and integration of OEI procedures with other commercial maneuvers when all elements of this lesson are completed to commercial ACS standards with consistency and confidence.