Visual Scanning and Collision Avoidance

Objective

Upon completion of this lesson, the CFI candidate will be able to effectively teach visual scanning and collision avoidance techniques to helicopter students, demonstrating mastery of environmental factors affecting vision, illusions, scanning procedures, blind spot awareness, collision risk assessment, and attention division between cockpit and outside references. The candidate will meet the knowledge, risk management, and skill standards outlined in ACS task HI.II.B.

Content

Environmental Conditions That Degrade Vision

Environmental factors significantly impact a pilot’s ability to detect and avoid traffic. Teach students to recognize these degrading conditions:

Light Conditions:

• Bright sunlight creates glare and reduces contrast sensitivity
• Haze scatters light, making aircraft appear fuzzy or invisible
• Dawn/dusk presents challenging backlighting scenarios
• Night vision limitations require understanding of rod/cone function

Weather Factors:

• Precipitation reduces visibility and creates windscreen distortion
• Fog and low clouds eliminate visual references
• Turbulence causes head movement, disrupting systematic scanning
• Smoke from fires or industrial sources creates visibility barriers

Atmospheric Conditions:

• High altitude reduces oxygen to the eyes, degrading night vision
• Heat shimmer distorts distant objects
• Industrial pollution creates haze layers
• Dust and particulates scatter light

Vestibular and Visual Illusions

The vestibular system and visual processing can create dangerous illusions affecting collision avoidance:

Vestibular Illusions:

• Somatogravic illusion during acceleration/deceleration
• Somatogyral illusion during turning maneuvers
• These affect spatial orientation and scanning effectiveness

Visual Illusions:

• Empty field myopia: eyes relax to intermediate distance (10-30 feet) in clear conditions
• Relative motion illusion: stationary objects appear to move
• Size-distance relationships: familiar aircraft appear closer/farther based on type
• Ground speed illusions affecting closure rate assessment

”See and Avoid” Responsibilities

Legal and practical responsibilities for collision avoidance:

Regulatory Framework:

• 14 CFR 91.113: Right-of-way rules
• 14 CFR 91.111: Operating near other aircraft
• Pilot responsibility regardless of ATC services

Shared Responsibility Concept:

• ATC provides traffic advisories, not separation in VFR conditions
• Pilots maintain ultimate responsibility for collision avoidance
• Technology supplements but doesn’t replace visual scanning

Helicopter-Specific Considerations:

• Lower altitude operations increase ground obstacle conflicts
• Unique flight profiles (hovering, autorotation) create unexpected encounters
• Limited climb/descent performance affects avoidance options

Visual Scanning Procedure and Peripheral Vision

Effective scanning requires systematic technique:

Scanning Technique:

• Divide airspace into 10-degree sectors
• Focus 1-2 seconds per sector with slight eye movement
• Overlap sectors to avoid gaps
• Systematic pattern: left to right, then reverse

Peripheral Vision Utilization:

• Central vision: 2-degree cone for detail recognition
• Peripheral vision: 120-degree field for motion detection
• Moving targets detected easier in peripheral vision
• Use central vision to identify targets detected peripherally

Focus Distance Management:

• Avoid empty field myopia by focusing at infinity
• Use distant ground references to maintain proper focus
• Blink regularly to prevent eye strain and maintain moisture

Aircraft Blind Spots and Clearing Procedures

Helicopters have unique blind spot challenges:

Helicopter Blind Spots:

• Rotor disc obscures significant airspace above and below
• A-pillars and door frames create forward blind spots
• Fuel tanks may block lateral visibility
• High instrument panel affects downward visibility

Clearing Procedures:

• Clearing turns before maneuvers
• Lift collective and lower nose to clear airspace below
• Bank aircraft to see around blind spots
• Coordinate clearing turns with traffic pattern procedures

Ground Operations:

• Taxi with clearing turns at appropriate intervals
• Use ground personnel for blind spot clearing when available
• Maintain awareness of ground traffic patterns

Visual Cues of Impending Mid-Air Collision

Recognition of collision threat indicators:

Relative Motion Cues:

• Aircraft with no apparent relative motion pose highest risk
• Bearing that remains constant with decreasing distance
• Target appears to grow larger without lateral movement

Angular Growth Rate:

• Rapidly expanding target indicates collision course
• Target remaining same relative position on windscreen
• Lack of observable movement in peripheral vision

Distance Assessment:

• Difficulty determining distance to unfamiliar aircraft types
• Use known aircraft dimensions for size comparison
• Consider atmospheric conditions affecting apparent size

Situations Creating Greatest Collision Risk

High-risk scenarios requiring enhanced vigilance:

Airport Environments:

• Traffic pattern entry/exit points
• Multiple runway operations
• Helicopter practice areas near airports
• Student training operations

En Route Hazards:

• Military training routes
• Popular recreational flying areas
• Emergency medical helicopter operations
• Agricultural aviation operations

Helicopter-Specific Risks:

• Low-altitude cruise flight
• Approach/departure corridors at hospitals
• Confined area operations
• Autorotation practice areas

Division of Attention Inside and Outside Aircraft

Balancing cockpit duties with traffic scanning:

Attention Management:

• 80% outside, 20% inside during VFR flight
• Systematic instrument scans coordinated with outside scanning
• Avoid fixation on any single task
• Use autopilot when available to increase outside scanning time

Cockpit Task Prioritization:

• Critical flight instruments take priority
• Non-critical tasks during straight and level flight
• Student pilot instruction timing
• Use of electronic aids to reduce heads-down time

Risk Management Elements

Distractions to Visual Scanning: Teach recognition and mitigation of scanning distractors including passenger conversations, electronic device usage, complex navigation tasks, and physiological discomfort.

Relaxed Intermediate Focal Distance: Address empty field myopia through focus discipline, using distant reference points, and recognition of the 10-30 foot focus trap in clear conditions.

High Volume Operational Environments: Emphasize enhanced scanning procedures near airports, increased radio monitoring, coordination with ATC, and understanding traffic flow patterns.

Collision Reaction Time: Explain the 12.5-second rule for collision avoidance, factors affecting reaction time, and the importance of early detection for successful avoidance.

Use of Safety Pilot: Cover when safety pilot requirements apply, clear division of responsibilities, communication procedures, and legal logging requirements.

Schedule

Equipment

Required References:

• FAA-H-8083-4 Helicopter Instructor’s Handbook
• FAA-H-8083-21 Helicopter Flying Handbook
• 14 CFR Part 91
• AIM Chapter 4, Section 4
• FAA-S-ACS-29 CFI Helicopter Airman Certification Standards

Visual Aids:

• Helicopter cockpit diagram showing blind spots
• Visual scanning pattern diagrams
• Environmental condition photographs
• Collision geometry illustrations
• Traffic pattern diagrams

Materials:

• Whiteboard/markers for scanning pattern demonstration
• Model aircraft for relative motion demonstration
• Current sectional chart for traffic area identification

Instructor Actions

The CFI candidate will:

1. Demonstrate Environmental Assessment: Show how to evaluate current conditions for visibility limitations, explaining impact on scanning effectiveness and providing specific examples of degraded vision scenarios

2. Explain Illusion Recognition: Describe vestibular and visual illusions with personal examples, demonstrate empty field myopia effects, and teach recognition techniques

3. Present Legal Framework: Clearly explain see-and-avoid responsibilities, cite specific regulations, and discuss helicopter-specific applications

4. Demonstrate Scanning Technique: Show proper systematic scanning using 10-degree sectors, demonstrate eye movement patterns, and explain timing for each sector

5. Identify Blind Spots: Point out helicopter-specific blind areas using cockpit or diagram, demonstrate clearing procedures, and explain when to use each technique

6. Teach Collision Recognition: Describe relative motion cues with visual aids, explain target expansion recognition, and identify high-risk encounter scenarios

7. Show Attention Division: Demonstrate 80/20 rule application, coordinate instrument scanning with outside scanning, and explain priority management

8. Address Risk Management: Cover all five risk elements with specific mitigation strategies, provide scenario-based examples, and emphasize prevention techniques

Student Actions

The student will:

1. Identify Environmental Factors: Recognize conditions that degrade vision in provided scenarios and suggest appropriate countermeasures

2. Describe Illusions: Explain how vestibular and visual illusions affect collision avoidance and provide personal examples

3. Apply Legal Knowledge: State see-and-avoid responsibilities and explain right-of-way rules for helicopter operations

4. Practice Scanning: Demonstrate systematic scanning technique using proper sector division and timing

5. Locate Blind Spots: Identify helicopter blind spots and explain appropriate clearing procedures for each

6. Recognize Collision Threats: Identify visual cues indicating collision risk in various scenarios

7. Manage Attention: Demonstrate proper division of attention between inside and outside references

8. Assess Risk Factors: Identify risk management elements in presented scenarios and suggest mitigation strategies

Completion Standards

The CFI candidate successfully completes HI.II.B when able to:

Knowledge Standards:

• Accurately explain all environmental conditions that degrade vision (HI.II.B.K1)
• Describe vestibular and visual illusions with relevant examples (HI.II.B.K2)
• State see-and-avoid responsibilities per regulations (HI.II.B.K3)
• Demonstrate proper visual scanning procedures emphasizing peripheral vision use (HI.II.B.K4)
• Identify helicopter blind spots and explain clearing procedures (HI.II.B.K5)
• Recognize visual cues indicating impending collision (HI.II.B.K6)
• Identify situations creating greatest collision risk (HI.II.B.K7)
• Explain proper division of attention inside/outside aircraft (HI.II.B.K8)

Risk Management Standards:

• Address all risk management elements with appropriate mitigation strategies (HI.II.B.R1-R5)
• Provide specific examples relevant to helicopter operations
• Demonstrate understanding of prevention-focused approach

Skill Standards:

• Effectively demonstrate short, regularly spaced eye movements for scanning (HI.II.B.S1)
• Show techniques for scanning around physical obstructions (HI.II.B.S2)
• Use appropriate visual scanning techniques for various flight conditions (HI.II.B.S3)
• Explain electronic traffic alert system usage when available (HI.II.B.S4)

Teaching Standards:

• Present information in logical, organized manner
• Use appropriate teaching methods for adult learners
• Demonstrate ability to assess student understanding
• Provide clear, actionable guidance for skill improvement