Simulated Powerplant Failure Considerations (Single and Multiengine Helicopters)

Objective

The CFI candidate will demonstrate the ability to teach safety considerations for simulated powerplant failures in both single and multi-engine helicopters. Upon completion, the candidate will effectively explain pre-flight briefing requirements, landing site evaluation criteria, environmental factors, and proper procedures according to POH/RFM guidelines, meeting the standards outlined in ACS task HI.17.F.

Content

Introduction to Simulated Powerplant Failure Safety

Teaching simulated powerplant failures requires exceptional judgment and systematic safety planning. As instructors, we must balance realistic training with absolute safety margins. Think of it like teaching someone to swim in deep water - you need the lifeguard, the safety equipment, and the exit strategy all planned before anyone gets wet.

Pre-Flight Briefing Requirements (HI.XVII.F.K1, HI.XVII.F.S1)

Every simulated powerplant failure must begin with a comprehensive briefing covering three critical elements:

Who Will Initiate the Failure:

• Clearly establish whether instructor or student will call for the simulation
• Use standardized phraseology: “Simulated engine failure” or agreed-upon terminology
• Ensure both parties understand the initiation signal

Method of Simulation:

• Reduce collective to simulate power loss (most common method)
• Some helicopters may use throttle reduction (check POH/RFM)
• Never actually shut down the engine or secure fuel
• Maintain ability for immediate power recovery

Who Performs Power Recovery:

• Designate who will restore power and when
• Establish recovery altitude (typically 500 feet AGL minimum)
• Use clear recovery commands: “My controls, power recovery”

POH/RFM Compliance (HI.XVII.F.K2, HI.XVII.F.R3)

Each helicopter manufacturer provides specific procedures for simulated failures. Key considerations include:

• Minimum altitudes for autorotation practice
• Specific power reduction techniques
• Recovery procedures and power application rates
• Weight and balance limitations during practice
• Environmental restrictions (temperature, density altitude)

Robinson helicopters, for example, prohibit autorotation practice below 500 feet AGL due to low inertia rotor systems. Turbine helicopters may have different considerations regarding power recovery techniques.

Forced Landing Potential (HI.XVII.F.K3)

Every simulated failure carries real risk. Murphy’s Law applies - if something can go wrong during practice, it might. Consider scenarios where power recovery fails:

• Actual engine problems developing during simulation
• Hydraulic failures in helicopters with powered controls
• Tail rotor malfunctions during low-G maneuvers
• Student panic or control confusion

Always maintain the mindset that this practice autorotation could become the real thing.

Landing Site Evaluation (HI.XVII.F.K4, HI.XVII.F.R1, HI.XVII.F.S2)

Before any simulated failure, systematically evaluate potential landing sites:

Suitable Surface Types:

• Hard surface runways (ideal - clear approaches, emergency services)
• Taxiways with adequate width and length
• Designated hard surface landing areas
• Large parking lots (check for obstacles, power lines)
• Well-maintained grass fields
• Grass runways in good condition

Surface Evaluation Criteria:

• Minimum size: 2 times rotor diameter plus safety margin
• Firm, level surface without holes or debris
• Clear approaches from multiple directions
• Absence of people, vehicles, or structures
• Emergency access for rescue vehicles

Unsuitable Areas to Avoid:

• Congested areas with people or property
• Rough, uneven, or soft surfaces
• Areas with obstacles in approach/departure paths
• Near power lines, towers, or antennas
• Areas without emergency vehicle access

Environmental Factors (HI.XVII.F.K5, HI.XVII.F.R2)

Multiple environmental factors affect autorotation performance and safety:

Wind Considerations:

• Autorotations require more altitude in strong winds
• Crosswinds affect approach path planning
• Gusty conditions increase difficulty and risk
• Tailwinds reduce autorotation glide distance

Density Altitude Effects:

• High density altitude reduces rotor efficiency
• Requires higher approach speeds and longer landing rolls
• May exceed helicopter performance capabilities
• Affects power available for recovery

Temperature Impacts:

• Extreme cold affects engine response time
• High temperatures reduce power available
• Affects hydraulic and control system performance

Aircraft Loading:

• Heavy aircraft have higher descent rates
• Forward CG affects cyclic authority
• Aft CG affects longitudinal stability during autorotation
• Fuel distribution affects handling characteristics

Helicopter Type Considerations:

• Low inertia rotor systems (Robinson) require immediate action
• High inertia systems (large turbines) provide more reaction time
• Single vs. twin engine procedures differ significantly
• Hydraulically assisted vs. manual controls affect technique

Risk Management Strategies

Implement multiple safety layers:

1. Pre-flight Planning: Weather, weight/balance, route selection
2. Area Familiarization: Know all suitable landing areas
3. Progressive Training: Start high, work down gradually
4. Clear Communication: Standardized procedures and phraseology
5. Conservative Margins: Higher altitudes, better conditions than minimum
6. Escape Routes: Always have multiple options available

Teaching Techniques

When instructing simulated failures:

• Demonstrate proper briefing techniques
• Show landing site evaluation process
• Practice threat assessment skills
• Emphasize conservative decision-making
• Build student confidence through progression
• Debrief thoroughly after each practice session

Schedule

Equipment

Required References:

• FAA-H-8083-4 Helicopter Instructor’s Handbook Chapter 12
• FAA-H-8083-21 Helicopter Flying Handbook Chapter 11
• Applicable helicopter POH/RFM
• FAA-S-ACS-29 Helicopter Flight Instructor ACS

Materials:

• Sectional chart of local practice area
• Landing site evaluation checklist
• Density altitude computation chart or calculator
• Weight and balance forms for helicopter type

Visual Aids:

• Overhead view diagram of suitable landing areas
• Autorotation energy management chart
• Environmental factors comparison table
• Pre-flight briefing checklist template

Instructor Actions

The CFI candidate will:

1. Demonstrate Pre-Flight Briefing Technique: Conduct complete briefing covering initiation signals, simulation methods, and recovery procedures using standardized format and clear communication

2. Show Landing Site Evaluation Process: Systematically assess potential landing areas using sectional charts and visual references, explaining suitable vs. unsuitable characteristics with specific examples

3. Explain Environmental Factor Assessment: Calculate density altitude effects, demonstrate wind analysis techniques, and show how aircraft loading affects autorotation performance

4. Present Risk Management Integration: Combine all safety factors into comprehensive threat assessment, demonstrating conservative decision-making and escape route planning

5. Model Professional Teaching Standards: Use clear explanations, relevant analogies, and systematic progression while maintaining safety-focused mindset throughout instruction

Student Actions

The student (evaluator) will:

1. Participate in Briefing Practice: Role-play both instructor and student roles in pre-flight briefings, demonstrating understanding of communication requirements

2. Practice Site Evaluation: Identify suitable and unsuitable landing areas on sectional charts and explain reasoning for each assessment decision

3. Calculate Environmental Factors: Compute density altitude effects and analyze wind conditions for their impact on autorotation planning

4. Demonstrate Threat Assessment: Combine multiple risk factors into overall safety evaluation and propose appropriate mitigation strategies

5. Ask Relevant Questions: Engage with content through questions that demonstrate understanding of safety principles and practical application scenarios

Completion Standards

The CFI candidate’s performance must meet ACS task HI.17.F standards, demonstrating the ability to teach students to:

1. Conduct Comprehensive Pre-Flight Briefings: Student explains who initiates failures, simulation methods, and recovery procedures with 100% accuracy and clear communication standards

2. Evaluate Landing Sites Systematically: Student identifies suitable hard surface runways, taxiways, designated areas, parking lots, and grass fields while explaining specific safety criteria for each type

3. Assess Environmental Factors Accurately: Student correctly evaluates wind effects, density altitude impacts, temperature considerations, aircraft loading effects, and helicopter type limitations

4. Apply Risk Management Principles: Student demonstrates systematic threat assessment combining all safety factors with conservative decision-making and appropriate safety margins

5. Integrate POH/RFM Compliance: Student references manufacturer procedures and limitations accurately while explaining their application to specific operational scenarios

The candidate must demonstrate teaching effectiveness through clear explanations, appropriate use of visual aids, systematic presentation of safety factors, and the ability to answer questions accurately while maintaining focus on safety-first principles throughout the lesson.