FH.VII.A.R3
Risk managementGround resonance, as applicable.
From the FAA library
- 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 ... 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 effect causes an increase in the local pressure at the static source…
- 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…
- Appendix C: Certificates, Ratings, and Endorsements › Flight Instructor Endorsements › Sport Pilot
basic requirements. Forms 8710-1, 8610-2, and 8710-11 are versions of the Airman Certificate and/or Rating Application. The instructor should ensure the applicant is prepared for the test and has met all the regulatory requirements, including knowledge, proficiency ... required endorsements, and experience requirements before the application process. The applicant then either completes the 8710 or 8610 paper form by hand or uses the Integrated Airman Certification and Rating Application (IACRA) electronic application system available at iacra.faa.gov/IACRA/Default.aspx. Whenever…
- Chapter 9: Techniques of Flight Instruction › Integrating Instruction Techniques › Ground Instruction
Integrating Instruction Techniques A flight instructor uses many instructional techniques during ground instruction, when using simulation, and during hands-on aircraft training. Since flight training costs are high and new aircraft are more complex than in the past, the total ... time without sacrificing the quality of the end product. This section looks at teaching techniques in greater detail. Ground Instruction Ground instruction can be highly effective if it follows an overall plan designed to prepare the learner for flight…
- Chapter 9: Techniques of Flight Instruction › Assessment of Piloting Ability › Practical Test Recommendations
Practical Test Recommendations Provision is made on the airman certificate or rating application form for the written recommendation of the flight instructor who has prepared the applicant for the practical test involved. Signing this recommendation imposes a serious responsibility ... flight instructor. A flight instructor who makes a practical test recommendation for an applicant seeking a certificate or rating should require the applicant to thoroughly demonstrate the knowledge and skill level required for that certificate or rating. This demonstration should…
- Chapter 11: Communication & Navigation › Antennas › Transmission Lines
performance, the impedance of the transmission line should be equal to the impedance of the antenna. In aviation antenna applications, this is often approximately 50 ohms. [Figure 11-94] Special connectors are used for coaxial cable. A variety ... metal-skinned aircraft, a ¼ wavelength Marconi antenna is used. The skin is the ground plane that creates the 2nd quarter of the antenna required for resonance (left). On a non metallic-skinned aircraft, wires, conductive plates or strips equal…