PH.V.A.R2c

From the FAA library

• Pilot's Handbook of Aeronautical Knowledgep. 11-15
  Chapter 11: Aircraft Performance › Takeoff and Landing Performance › Takeoff Performance

  allow the aircraft to reach the lift-off speed at a lower groundspeed, while the effect of a tailwind is to require the aircraft to achieve a greater groundspeed to attain the lift-off speed. A headwind that ... percent of the takeoff airspeed reduces the takeoff distance approximately 19 percent. However, a tailwind that is 10 percent of the takeoff airspeed increases the takeoff distance approximately 21 percent. In the case where the headwind speed is 50 percent…

• Aeronautical Information Manualp. 7-4-4
  Chapter 7. Safety of Flight › Section 4. Wake Turbulence › 7-4-4. Vortex Behavior

  time and hasten the drift of the downwind vortex toward another runway. (See FIG 7-4-6.) Similarly, a tailwind condition can move the vortices of the preceding aircraft forward into the touchdown zone. THE LIGHT QUARTERING TAILWIND REQUIRES MAXIMUM ... aircraft upwind from their approach and takeoff flight paths. (See FIG 7-4-7.) Vortex Movement in Ground Effect - Tailwind…

• Helicopter Flying Handbookp. 7-2
  Chapter 7: Helicopter Performance › Factors Affecting Performance › Winds

  important consideration. Headwinds are the most desirable as they contribute to the greatest increase in performance. Strong crosswinds and tailwinds may require the use of more tail rotor thrust to maintain directional control. This increased tail rotor thrust absorbs power ... translational lift is achieved earlier, resulting in more lift and a steeper climb angle. When taking off with a tailwind, more distance is required to accelerate through translation lift…

• Pilot's Handbook of Aeronautical Knowledgep. 12-10
  Chapter 12: Weather Theory › Wind and Currents › Low-Level Wind Shear

  aircraft. It can rapidly change the performance of the aircraft and disrupt the normal flight attitude. For example, a tailwind quickly changing to a headwind causes an increase in airspeed and performance. Conversely, a headwind changing to a tailwind causes…

• Helicopter Flying Handbookp. 13-7
  Chapter 13: Effective Aeronautical Decision-Making › Single-Pilot Resource Management

  direction of wind information received from an earlier weather brief? Making an approach into a confined area with a tailwind is a bad decision and can be avoided. Prior to landing, the pilot should use outside resources such a smoke…

• Aeronautical Information Manualp. 7-6-7
  Chapter 7. Safety of Flight › Section 6. Potential Flight Hazards › 7-6-8. Use of Runway Half-way Signs at Unimproved Airports

  runway. In addition, this technique does not take into account the effects of upslope or tailwinds on takeoff performance. These factors will also require greater acceleration than normal and, under some circumstances, prevent takeoff entirely. d. Use of this “rule…