Normal and Crosswind Approach

Objective

The CFI candidate will demonstrate the ability to teach normal and crosswind approach techniques to helicopter students by explaining aerodynamic principles, environmental factors, risk management considerations, and proper technique execution. Upon completion, the candidate will be able to effectively instruct students in establishing and maintaining stabilized approach profiles with appropriate wind corrections while identifying and correcting common errors. This lesson addresses ACS task HI.IX.B.

Content

Normal Approach Fundamentals

A normal approach is a controlled descent from pattern altitude or cruise flight to a landing or hovering position. The approach profile should be stable, predictable, and within the aircraft’s performance envelope. Think of it like descending a gentle staircase rather than sliding down a steep slide - smooth, controlled, and with constant situational awareness.

Effects of Environmental Factors on Performance (HI.IX.B.K1)

Wind Effects:

• Headwind: Steepens approach angle, reduces ground speed, increases power requirement to maintain airspeed
• Tailwind: Flattens approach angle, increases ground speed, may require power reduction
• Crosswind: Creates drift, requires crab angle or slip correction

Weight Effects:

• Heavier aircraft require more power throughout approach
• Higher disc loading affects rate of descent and flare characteristics
• Changes optimal approach airspeed and angle

Altitude Effects:

• Density altitude reduces engine and rotor performance
• Higher density altitude requires earlier power application
• Affects autorotation capability and go-around performance

Temperature Effects:

• Hot conditions reduce air density and performance
• Cold conditions may improve performance but affect engine response
• Temperature gradients create turbulence and wind shear

Wind Correction Techniques (HI.IX.B.K2)

Crab Method:

• Establish heading correction to maintain ground track
• Align with landing surface just before touchdown
• Most efficient method for maintaining ground track

Wing-Low (Slip) Method:

• Lower upwind skid with lateral cyclic
• Maintain centerline with opposite pedal input
• Continuous throughout approach to touchdown

Combination Method:

• Use crab during approach
• Transition to wing-low method in final stages
• Provides benefits of both techniques

Landing Area Selection and Assessment (HI.IX.B.K3)

Surface Evaluation:

• Firmness and slope considerations
• Obstacle clearance requirements
• Wind direction and velocity assessment
• Size adequate for helicopter dimensions plus safety margin

Touchdown Point Selection:

• Beyond obstacles but with adequate stopping distance
• Consider wind conditions and escape routes
• Account for ground effect and recirculation patterns

Height/Velocity Diagram Factors (HI.IX.B.K4)

The H/V diagram represents combinations of height and airspeed to be avoided during single-engine flight. Factors affecting the profile include:

• Aircraft gross weight (heavier = larger avoid area)
• Density altitude (higher = larger avoid area)
• Center of gravity position
• Aircraft configuration
• Pilot technique and reaction time

During approach, maintain airspeeds and altitudes outside the shaded area whenever possible.

Common Errors (HI.IX.B.K5)

• Inconsistent approach airspeed and angle
• Inadequate wind drift correction
• Poor power management and Nr control
• Failure to maintain ground track
• Improper use of controls during wind corrections
• Inadequate traffic scanning
• Poor communication procedures

Risk Management Considerations

Approach Path Selection (HI.IX.B.R1): Evaluate aircraft performance limitations against current conditions. Consider weight, balance, density altitude, and fuel state when determining approach profile. Select approach angle that maintains safe energy state throughout descent.

Crosswind Effects (HI.IX.B.R2): Crosswinds create several hazards: drift from intended ground track, increased control inputs near surface, potential for dynamic rollover during touchdown, and reduced directional control effectiveness. Maximum demonstrated crosswind component provides operational guidance.

Wind Shear Recognition (HI.IX.B.R3): Sudden changes in wind speed or direction affect aircraft energy state. Indicators include rapid airspeed fluctuations, unexpected altitude deviations, and unusual control pressures. Prepare for immediate go-around if encountered.

Tailwind Hazards (HI.IX.B.R4): Tailwinds flatten approach angle and increase ground speed. Risk of hard landing increases due to higher kinetic energy. Consider runway length and obstacle clearance requirements.

Turbulence Management (HI.IX.B.R5): Mechanical and thermal turbulence affect control precision. Wake turbulence from other aircraft poses significant hazard. Maintain extra airspeed margin and be prepared for aggressive control inputs.

Vortex Ring State Avoidance (HI.IX.B.R6): VRS develops when helicopter descends into its own downwash with insufficient forward airspeed. Most likely during steep approaches with high power settings. Maintain forward airspeed throughout approach profile.

Surface Condition Assessment (HI.IX.B.R7): Evaluate landing surface for contamination, slope, and firmness. Consider dynamic rollover potential and ground resonance possibilities. Wet or icy surfaces significantly affect control during surface operations.

Go-Around Procedures (HI.IX.B.R8): Maintain go-around mindset throughout approach. Execute immediately if approach becomes unstabilized. Add power, adjust attitude, communicate intentions, and ensure obstacle clearance.

Collision Hazard Awareness (HI.IX.B.R9): Maintain continuous scanning for conflicting traffic. Use radio communications and transponder as appropriate. Be especially vigilant in airport traffic patterns and uncontrolled airspace.

Situational Awareness (HI.IX.B.R10): Prioritize tasks effectively: fly aircraft first, navigate second, communicate third. Avoid fixation on single instruments or external references. Maintain awareness of aircraft energy state and position relative to obstacles.

LTE Considerations (HI.IX.B.R11): Loss of tail rotor effectiveness most likely during slow airspeeds with quartering tailwinds from right. Maintain awareness of critical azimuth and wind conditions. Ensure adequate airspeed margin during approach.

Schedule

Equipment

Required References:

• FAA-H-8083-4 Helicopter Instructor’s Handbook
• FAA-H-8083-21 Helicopter Flying Handbook
• Aircraft Flight Manual/Pilot’s Operating Handbook
• FAA-S-ACS-29 Helicopter Instructor ACS

Visual Aids:

• Height/Velocity diagram chart
• Wind correction technique illustrations
• Airport diagram and sectional chart
• Approach angle demonstration model
• Whiteboard for wind triangle calculations

Aircraft:

• Properly certificated helicopter with dual controls
• Current inspections and airworthiness documents
• Operating handbook readily available

Instructor Actions

The CFI candidate will demonstrate teaching effectiveness by:

1. Explaining environmental factors while showing H/V diagram and calculating density altitude effects on performance
2. Demonstrating wind assessment techniques using windsock, smoke, or surface indicators while explaining wind triangle principles
3. Showing proper radio procedures by making appropriate position reports and coordination calls throughout approach sequence
4. Executing stabilized approach profile while maintaining continuous narration of control inputs, power adjustments, and visual references
5. Demonstrating crosswind correction techniques using both crab and wing-low methods while explaining when each is most appropriate
6. Maintaining aircraft control with Nr in normal operating range throughout approach profile while explaining power management principles
7. Scanning traffic pattern systematically while explaining collision avoidance responsibilities and communication procedures
8. Arriving at intended touchdown point within ACS tolerances while explaining sight picture and control technique
9. Identifying and correcting common student errors such as inconsistent airspeed, inadequate drift correction, and poor power management
10. Explaining go-around decision criteria and demonstrating immediate execution when approach parameters exceed safe limits
11. Teaching runway incursion avoidance procedures including proper communication and surface movement protocols

Student Actions

The student (evaluator playing student role) will:

1. Ask questions about wind correction angles and their calculation methods
2. Request clarification on H/V diagram interpretation and operational significance
3. Practice approach techniques under instructor guidance while receiving feedback on performance
4. Identify wind direction using available indicators and environmental clues
5. Demonstrate understanding of risk factors through scenario-based questioning
6. Perform approach procedures following instructor demonstration and guidance
7. Recognize approach errors when prompted and suggest appropriate corrections
8. Execute missed approach when instructed while explaining decision criteria
9. Complete approach checklists as directed while maintaining aircraft control
10. Respond to emergency scenarios such as wind shear encounter or traffic conflicts

Completion Standards

The CFI candidate demonstrates instructional competency when they can:

Knowledge Requirements (HI.IX.B.K1-K5):

• Accurately explain how weight, altitude, temperature, and wind affect approach performance parameters
• Demonstrate at least two wind correction techniques and explain appropriate application
• Identify suitable landing areas considering surface conditions, obstacles, and operational factors
• Explain H/V diagram factors and their effect on approach planning
• Identify and explain correction techniques for common approach errors

Risk Management (HI.IX.B.R1-R11):

• Assess and explain approach path selection based on current aircraft performance and environmental conditions
• Identify and explain mitigation strategies for crosswind, wind shear, tailwind, and turbulence hazards
• Demonstrate understanding of VRS conditions and avoidance techniques
• Explain surface condition assessment and dynamic rollover considerations
• Teach go-around decision criteria and execution procedures
• Demonstrate collision avoidance scanning and communication techniques
• Explain LTE recognition and avoidance during approach operations

Skill Demonstration (HI.IX.B.S1-S11):

• Complete appropriate checklists while maintaining instructional dialogue
• Make radio calls using proper phraseology and timing
• Accurately determine wind direction using available indicators
• Maintain proper ground track within 1/2 aircraft width of centerline
• Establish approach angle between 8-12 degrees with stable rate of closure
• Maintain Nr within normal operating limits (±50 rpm)
• Arrive at touchdown point within ±2 feet of intended position
• Demonstrate runway incursion avoidance procedures when applicable
• Effectively analyze and teach correction of common student errors

The lesson meets ACS standards when the CFI candidate can simultaneously demonstrate proper technique while providing clear, accurate instruction that addresses all knowledge, risk management, and skill elements specified in task HI.IX.B.