IL.VII.C.S3

From the FAA library

• Aeronautical Information Manualp. 4-3-23
  Chapter 4. Air Traffic Control › Section 3. Airport Operations › 4-3-17. VFR Helicopter Operations at Controlled Airports

  However, if a higher than normal airspeed or altitude is desired, the request should be made prior to lift-off. The pilot is solely responsible for selecting a safe airspeed for the altitude/operation being conducted. Use of air taxi enables…

• Pilot's Handbook of Aeronautical Knowledgep. 4-4
  Chapter 4: Principles of Flight › Pressure › Density Altitude

  Density Altitude SDP is a theoretical pressure altitude, but aircraft operate in a nonstandard atmosphere and the term density altitude is used for correlating aerodynamic performance in the nonstandard atmosphere. Density altitude is the vertical distance above sea level ... propeller is less efficient in thin air • Lift because the thin air exerts less force on the airfoils Density altitude is pressure altitude corrected for nonstandard temperature. As the density of the air increases (lower density altitude), aircraft performance increases…

• Pilot's Handbook of Aeronautical Knowledgep. 8-6
  Chapter 8: Flight Instruments › Types of Altitude

  Indicated altitude—read directly from the altimeter (uncorrected) when it is set to the current altimeter setting. 2. True altitude—the vertical distance of the aircraft above sea level—the actual altitude. It is often expressed as feet above mean ... level (MSL). Airport, terrain, and obstacle elevations on aeronautical charts are true altitudes. 3. Absolute altitude—the vertical distance of an aircraft above the terrain, or above ground level (AGL). 4. Pressure altitude—the altitude indicated when the altimeter setting…

• Pilot's Handbook of Aeronautical Knowledgep. 11-3
  Chapter 11: Aircraft Performance › Density Altitude

  Density Altitude The more appropriate term for correlating aerodynamic performance in the nonstandard atmosphere is density altitude—the altitude in the standard atmosphere corresponding to a particular value of air density. Density altitude is pressure altitude corrected for nonstandard temperature ... density of the air increases (lower density altitude), aircraft performance increases. Conversely, as air density decreases (higher density altitude), aircraft performance decreases. A decrease in air density means a high density altitude; an increase in air density means a lower…

• Pilot's Handbook of Aeronautical Knowledgep. 8-9
  Chapter 8: Flight Instruments › Instrument Check › Airspeed Indicator (ASI)

  This error is generally greatest at low airspeeds. In the cruising and higher airspeed ranges, IAS and CAS are approximately the same. Refer to the airspeed calibration chart to correct for possible airspeed errors. • True airspeed (TAS)—CAS corrected ... altitude and nonstandard temperature. Because air density decreases with an increase in altitude, an aircraft has to be flown faster at higher altitudes to cause the same pressure difference between pitot impact pressure and static pressure. Therefore, for a given…

• Airplane Flying Handbookp. 5-9
  Chapter 5: Maintaining Aircraft Control: Upset Prevention and Recovery Training › Slow Flight

  flight. While pilots typically perform these operations at low airspeeds and close to the ground, pilots learn to maneuver an airplane in slow flight at a safe altitude. During slow flight, any further increase in angle of attack, increase ... regime, where there is a degraded response to control inputs and where it is more difficult to maintain a selected altitude. It is essential that pilots: 1. understand the aerodynamics associated with slow flight in various aircraft configurations and attitudes…