AP.IV.E.S4

From the FAA library

• Pilot's Handbook of Aeronautical Knowledgep. 5-25
  Chapter 5: Aerodynamics of Flight › Stalls

  stated above, it does not completely stop producing lift. In most straight-wing aircraft, the wing is designed to stall the wing root first. The wing root reaches its critical AOA first making the stall progress outward toward the wingtip ... having the wing root stall first, aileron effectiveness is maintained at the wingtips, maintaining controllability of the aircraft. Various design methods are used to achieve the stalling of the wing root first. In one design, the wing is “twisted…

• Pilot's Handbook of Aeronautical Knowledgep. 7-23
  Chapter 7: Aircraft Systems › Turbine Engines › Compressor Stalls

  Compressor Stalls Compressor blades are small airfoils and are subject to the same aerodynamic principles that apply to any airfoil. A compressor blade has an AOA that is a result of inlet air velocity and the compressor’s rotational velocity ... combine to form a vector, which defines the airfoil’s actual AOA to the approaching inlet air. A compressor stall is an imbalance between the two vector quantities, inlet velocity, and compressor rotational speed. Compressor stalls occur when the compressor…

• Pilot's Handbook of Aeronautical Knowledgep. 5-49
  Chapter 5: Aerodynamics of Flight › Boundary Layer Separation › Sweepback

  Figure 5-70. T-tail stall. AOA. In this situation, without reliable AOA information, a nose-down pitch attitude with an increasing airspeed is no guarantee that recovery has been affected, and up-elevator movement at this stage may merely ... keep the aircraft stalled. It is a characteristic of T-tail aircraft to pitch up viciously when stalled in extreme nose-high attitudes, making recovery difficult or violent. The stick pusher inhibits this type of stall. At approximately one knot…

• Pilot's Handbook of Aeronautical Knowledgep. 5-34
  Chapter 5: Aerodynamics of Flight › Load Factors › Load Factors and Stalling Speeds

  Load Factors and Stalling Speeds Any aircraft, within the limits of its structure, may be stalled at any airspeed. When a sufficiently high AOA is imposed, the smooth flow of air over an airfoil breaks up and separates, producing ... abrupt change of flight characteristics and a sudden loss of lift, which results in a stall. A study of this effect has revealed that an aircraft’s stalling speed increases in proportion to the square root of the load factor…

• Pilot's Handbook of Aeronautical Knowledgep. 5-26
  Chapter 5: Aerodynamics of Flight › Angle of Attack Indicators

  those accidents, half involve stall/spin scenarios. Technology such as AOA indicators can have a tremendous impact on reversing this trend and are increasingly affordable for general aviation airplanes. [Figure 5-41] The purpose of an AOA indicator is to give ... pilot better situation awareness pertaining to the aerodynamic health of the airfoil. This can also be referred to as stall margin awareness. More simply explained, it is the margin that exists between the current AOA that the airfoil is operating…

• Airplane Flying Handbookp. 5-12
  Chapter 5: Maintaining Aircraft Control: Upset Prevention and Recovery Training › Stalls › Stall Recognition

  Indications of a full stall are typically that an uncommanded nose down pitch cannot be readily arrested, and may be accompanied by an uncommanded rolling motion. For airplanes equipped with stick pushers, their activation is also an indicator ... full stall. Although it depends on the degree to which a stall has progressed, some loss of altitude is expected during recovery. The longer it takes for the pilot to recognize an impending stall, the more likely it is that…