Rolling Takeoff (Wheel-Type Landing Gear)

Objective

Upon completion of this lesson, the student will demonstrate the ability to safely execute a rolling takeoff in a helicopter equipped with wheel-type landing gear. The student will identify when rolling takeoffs are appropriate, explain the effects of environmental factors on takeoff performance, and perform rolling takeoffs within the performance standards specified in FAA-S-ACS-15, Area V, Task I (PH.V.I).

Content

Elements of a Rolling Takeoff (PH.V.I.K1)

A rolling takeoff is a helicopter departure technique where the aircraft begins forward movement on the ground while gradually increasing collective pitch and cyclic input to achieve liftoff. Unlike a vertical takeoff, the rolling takeoff uses forward airspeed to enter translational lift earlier in the departure sequence.

The key elements include:

• Initial ground roll phase with gradual collective increase
• Cyclic input to maintain desired ground track and attitude
• Transition through translational lift during ground roll or just after liftoff
• Establishment of normal climb airspeed and power setting

Per 14 CFR 91.103, pilots must determine takeoff performance for each flight, considering aircraft weight, atmospheric conditions, and runway/surface characteristics.

Effects of Environmental Factors (PH.V.I.K2)

Wind Effects:

• Headwinds reduce ground roll distance and improve climb performance
• Tailwinds increase ground roll distance and degrade initial climb performance
• Crosswinds require drift correction techniques during ground roll and initial climb

Weight Effects:

• Increased gross weight requires higher power settings and longer ground roll
• Higher disk loading reduces climb performance and increases critical azimuth angles
• Weight affects Height/Velocity diagram limitations

Temperature and Density Altitude:

• Higher density altitude reduces engine power output and rotor efficiency
• Hot temperatures decrease air density, degrading performance
• Combined high temperature and altitude create compounding performance penalties

Reference FAA-H-8083-21B Chapter 9 for detailed performance calculations.

Appropriate Situations for Rolling Takeoffs (PH.V.I.K3)

Rolling takeoffs are recommended when:

• Operating at or near maximum gross weight
• High density altitude conditions exist
• Available power is limited
• Smooth, firm surface of adequate length is available
• Wind conditions favor the technique
• Obstacle clearance requirements can be met

Rolling takeoffs are NOT appropriate when:

• Confined area operations are required
• Soft, rough, or contaminated surfaces exist
• Crosswind component exceeds aircraft limitations (typically 17 knots per manufacturer specifications)
• Obstacles immediately ahead of takeoff path

Translational Lift (PH.V.I.K4)

Translational lift occurs when the helicopter transitions from hovering flight to forward flight, typically beginning around 16-24 knots groundspeed depending on atmospheric conditions. During rolling takeoffs, this phenomenon provides:

• Increased rotor efficiency due to undisturbed air
• Reduced power requirements
• Improved climb performance
• Better directional control

The pilot will feel the helicopter “lighten” as translational lift is achieved, requiring reduced collective input to maintain desired flight path.

Risk Management Considerations

Takeoff Path Selection (PH.V.I.R1): Evaluate available distance against performance requirements using manufacturer’s charts. Consider obstacles, terrain, and emergency landing sites. Select paths that provide maximum safety margins within aircraft limitations.

Wind Considerations (PH.V.I.R2):

• Wind Direction: Determine wind direction using windsocks, smoke, or other indicators. Plan drift correction for crosswind components.
• Windshear: Recognize conditions conducive to windshear (temperature inversions, frontal passages, terrain features). Avoid operations in known windshear conditions.
• Turbulence: Assess mechanical turbulence from buildings, terrain, or wake turbulence from other aircraft. Maintain increased safety margins in turbulent conditions.

Height/Velocity Considerations (PH.V.I.R3):

• H/V Diagram: Plan takeoff profile to minimize time in the avoid area of the Height/Velocity diagram
• Rejected Takeoff: Establish decision points for aborting takeoff based on performance parameters
• Engine Failure: Brief autorotation procedures and forced landing sites appropriate to takeoff phase

Collision Hazards (PH.V.I.R4): Maintain vigilant scanning for aircraft, vehicles, personnel, and obstacles. Use proper radio procedures and lighting as required by 14 CFR 91.209.

Surface Conditions (PH.V.I.R5): Evaluate surface for contamination, slope, and firmness. Wheel-type landing gear requires smooth, firm surfaces for safe rolling takeoffs.

Landing Gear Considerations (PH.V.I.R6): Verify proper landing gear configuration and limitations. Ensure gear is suitable for intended surface and weight.

Human Factors (PH.V.I.R7): Maintain situational awareness through proper scanning and communication. Prioritize tasks appropriately and avoid distractions during critical phases of flight.

Schedule

Equipment

Required References:

• FAA-S-ACS-15 (Private Pilot Helicopter ACS)
• FAA-H-8083-21B (Helicopter Flying Handbook)
• 14 CFR Part 91 (General Operating and Flight Rules)
• Aircraft Flight Manual/Pilot’s Operating Handbook
• Current aeronautical charts

Materials:

• Height/Velocity diagram for aircraft type
• Performance charts and worksheets
• Weight and balance forms
• Current weather information

Visual Aids:

• Whiteboard for wind triangle calculations
• Aircraft controls for ground demonstration
• Airport diagram showing takeoff surfaces

Instructor Actions

1. Review current weather conditions and calculate density altitude effects on helicopter performance
2. Demonstrate proper use of performance charts to determine takeoff distance and climb performance
3. Brief student on wind assessment techniques using available indicators
4. Explain Height/Velocity diagram considerations specific to rolling takeoffs
5. Demonstrate radio communication procedures per 14 CFR 91.126 for towered and non-towered airports
6. Show proper control inputs for initiating ground roll while maintaining rotor RPM limits
7. Demonstrate crosswind correction techniques during acceleration phase
8. Explain power management during transition through translational lift
9. Show proper climb-out procedures and airspeed control (±10 knots of target)
10. Demonstrate go-around procedures if takeoff parameters are not met
11. Provide real-time coaching on control inputs and aircraft performance
12. Point out visual and feel cues indicating successful translational lift
13. Guide student through multiple practice takeoffs with varying wind conditions
14. Debrief each attempt focusing on performance standards and safety considerations

Student Actions

The student will:

1. Complete appropriate preflight planning including performance calculations and risk assessment
2. Conduct thorough pre-takeoff checklist per manufacturer specifications
3. Assess wind conditions and determine appropriate takeoff heading
4. Make required radio calls per airport procedures and 14 CFR 91.126
5. Position helicopter on takeoff surface with proper alignment
6. Apply smooth, coordinated control inputs to initiate ground roll
7. Maintain rotor RPM within normal operating limits throughout takeoff sequence
8. Apply appropriate crosswind correction during acceleration phase
9. Recognize and utilize translational lift to improve climb performance
10. Transition to normal climb airspeed within ±10 knots of target speed
11. Maintain proper ground track after liftoff using crosswind correction
12. Complete multiple rolling takeoffs under varying wind conditions
13. Demonstrate decision-making regarding takeoff suitability based on conditions
14. Apply runway incursion avoidance procedures when operating at towered airports

Completion Standards

The student demonstrates satisfactory performance when able to:

Knowledge Standards (FAA-S-ACS-15 PH.V.I.K1-K4):

• Explain the four elements of a rolling takeoff procedure
• Describe how wind, weight, temperature, and density altitude affect takeoff performance
• Identify appropriate situations for rolling takeoff use and related performance factors
• Define translational lift and explain its benefits during rolling takeoffs

Risk Management Standards (FAA-S-ACS-15 PH.V.I.R1-R7):

• Select appropriate takeoff paths considering performance limitations and available distance
• Assess and mitigate wind-related risks including direction, windshear, and turbulence
• Apply Height/Velocity diagram considerations and brief emergency procedures
• Identify collision hazards and implement avoidance strategies
• Evaluate surface conditions for suitability
• Verify proper landing gear configuration
• Demonstrate effective task prioritization and situational awareness

Skill Standards (FAA-S-ACS-15 PH.V.I.S1-S10):

• Complete manufacturer’s checklist without omissions
• Make appropriate radio calls using standard phraseology
• Determine wind direction using available indicators
• Verify correct takeoff path alignment
• Maintain rotor RPM within manufacturer’s normal operating limits
• Execute smooth control inputs that initiate ground roll without abrupt movements
• Maintain ground track within ±10 feet of centerline during acceleration with crosswind correction
• Achieve normal climb airspeed within ±10 knots of manufacturer’s recommended speed
• Maintain proper ground track within ±10 degrees of desired heading after liftoff
• Apply runway incursion avoidance procedures at towered airports without prompting