HI.II.G.K2a
KnowledgeFactors affecting performance, including:
Atmospheric conditions
From the FAA library
- Chapter 11: Aircraft Performance
Chapter 11: Aircraft Performance This chapter discusses the factors that affect aircraft performance, which include the aircraft weight, atmospheric conditions, runway environment, and the fundamental physical laws governing the forces acting on an aircraft. The performance or operational information section ... tabular form, while others use graphs. In addition, the performance data may be presented on the basis of standard atmospheric conditions, pressure altitude, or density altitude. The performance information in the AFM/POH has little or no value unless the user…
- Chapter 11: Aircraft Performance › Density Altitude
increase in air density means a lower density altitude. Density altitude is used in calculating aircraft performance. Under standard atmospheric condition, air at each level in the atmosphere has a specific density; under standard conditions, pressure altitude and density altitude ... identify the same level. Density altitude, then, is the vertical distance above sea level in the standard atmosphere at which a given density is to be found. Figure 11-3. Field elevation versus pressure. The aircraft is located…
- Chapter 7: Helicopter Performance › Performance Charts › Sample Cruise or Level Flight Problem
show the change in torque, above or below torque, required for level flight under the same gross weight and atmospheric conditions to obtain a given rate of climb or descent. Sample Cruise or Level Flight Problem Determine torque setting…
- Chapter 4: Principles of Flight › Pressure › Density Altitude
density means a lower density altitude. Density altitude is used in calculating aircraft performance because under standard atmospheric conditions, air at each level in the atmosphere not only has a specific density, its pressure altitude and density altitude identify ... pressure altitude) and temperature. Since aircraft performance data at any level is based upon air density under standard day conditions, such performance data apply to air density levels that may not be identical with altimeter indications. Under conditions higher…
- Chapter 11: Aircraft Performance › Chapter Summary
systems. These systems may be on board or used during the planning phase of the flight. Moreover, aircraft weight, atmospheric conditions, and external environmental factors can significantly affect aircraft performance. It is essential that a pilot become intimately familiar with…
- Chapter 5: Aerodynamics of Flight › High Speed Flight › Subsonic Versus Supersonic Flow
speeds above this point. [Figure 5-64] Speed Ranges The speed of sound varies with temperature. Under standard temperature conditions of 15 °C, the speed of sound at sea level is 661 knots. At 40,000 feet, where the temperature ... Mach number”—the ratio of the true airspeed of the aircraft to the speed of sound in the same atmospheric conditions. An aircraft traveling at the speed of sound is traveling at Mach 1.0. Aircraft speed regimes are defined approximately…