SH.VIII.I.R1

From the FAA library

• Pilot's Handbook of Aeronautical Knowledgep. 5-11
  Chapter 5: Aerodynamics of Flight › Ground Effect

  Figure 5-16. Ground effect changes airflow. Ground effect also alters the thrust required versus velocity. Since induced drag predominates at low speeds, the reduction of induced drag due to ground effect will cause a significant reduction of thrust required ... parasite plus induced drag) at low speeds. Due to the change in upwash, downwash, and wingtip vortices, there may be a change in position (installation) error of the airspeed system associated with ground effect. In the majority of cases, ground…

• Helicopter Flying Handbookp. 11-11
  Chapter 11: Helicopter Emergencies and Hazards › Ground Resonance

  Ground Resonance Helicopters with articulating rotors (usually designs with three or more main rotor blades) are subject to ground resonance, a destructive vibration phenomenon that occurs at certain rotor speeds when the helicopter is on the ground. Ground resonance ... balance rotor. The unbalanced rotor disk vibrates at the same frequency (or multiple thereof) of the airframe’s resonant frequency, and the harmonic oscillation increases because the engine is adding power to the system, increasing the magnitude (amplitude…

• Pilot's Handbook of Aeronautical Knowledgep. 17-8
  Chapter 17: Aeromedical Factors › Health and Physiological Factors Affecting Pilot Performance › Visual Illusions

  stimulate the otolith organs enough to create the illusion of tumbling backwards, known as “inversion illusion.” The disoriented pilot may push the aircraft abruptly into a nose-low attitude, which may intensify this illusion. Elevator Illusion An abrupt upward vertical ... organs to create the illusion of being in a climb. This is known as “elevator illusion.” The disoriented pilot may push the aircraft into a nose-low attitude. An abrupt downward vertical acceleration, usually in a downdraft, has the opposite…

• Pilot's Handbook of Aeronautical Knowledgep. 17-7
  Chapter 17: Aeromedical Factors › Health and Physiological Factors Affecting Pilot Performance › Vestibular Illusions

  coriolis illusion. Graveyard Spiral As in other illusions, a pilot in a prolonged coordinated, constant-rate turn may experience the illusion of not turning. During the recovery to level flight, the pilot will then experience the sensation of turning ... aircraft tends to lose altitude in turns unless the pilot compensates for the loss in lift, the pilot may notice a loss of altitude. The absence of any sensation of turning creates the illusion of being in a level descent…

• 14 CFR Part 141 — Pilot SchoolsOpen
  14 CFR Part 141, Appendix H to Part 141—Ground Instructor Certification Course

  Part 141, Appendix H to Part 141—Ground Instructor Certification Course 1. Applicability. This appendix prescribes the minimum curriculum for a ground instructor certification course and an additional ground instructor rating course, required under this part, for the following ratings ... Ground Instructor—Basic. (b) Ground Instructor—Advanced. (c) Ground Instructor—Instrument. 2. Aeronautical knowledge training. (a) Each approved course must include at least the following ground training on the knowledge areas listed in paragraphs…

• Airplane Flying Handbookp. 7-4
  Chapter 7: Ground Reference Maneuvers › Drift and Ground Track Control › Constant Radius During Turning Flight

  With some experience, pilots may notice how wind direction affects the time needed for various segments of ground-referenced turns. To demonstrate the effect that wind has on turns, the pilot should select a straight-line ground reference, such ... road or railroad track. [Figure 7-3] Choosing a straight-line ground reference that is parallel to the wind, the airplane would be flown into the wind and directly over the selected straight-line ground reference. Once a straight-line…