Stall Recognition
A pilot must recognize the flight conditions that are conducive to stalls and know how to apply the necessary corrective action.
This level of proficiency requires learning to recognize an impending stall by sight, sound, and feel.
Stalls are usually accompanied by a continuous stall warning for airplanes equipped with stall warning devices.
These devices may include an aural alert, lights, or a stick shaker all which alert the pilot when approaching the critical AOA.
Certification standards permit manufacturers to provide the required stall warning either through the inherent aerodynamic qualities of the airplane or through a stall warning device that gives a clear indication of the impending stall.
However, most vintage airplanes, and many types of light sport and experimental airplanes, do not have stall warning devices installed.
Other sensory cues for the pilot include:
• Feel—the pilot will feel control pressures change as speed is reduced.
With progressively less resistance on the control surfaces, the pilot must use larger ontrol movements to get the desired airplane response.
The pilot will notice the airplane’s reaction time to control movement increases.
Just before the stall occurs, buffeting, uncommanded rolling, or vibrations may begin to occur.
• Vision—since the airplane can be stalled in any attitude, vision is not a foolproof indicator of an impending stall.
However, maintaining pitch awareness is important.
• Hearing—as speed decreases, the pilot should notice a change in sound made by the air flowing along the airplane structure.
• Kinesthesia—the physical sensation (sometimes referred to as “seat of the pants” sensations) of changes in direction or speed is an important indicator to the trained and experienced pilot in visual flight.
If this sensitivity is properly developed, it can warn the pilot of an impending stall.
Pilots in training must remember that a level-flight 1G stalling speed is valid only:
• In unaccelerated 1G flight
• In coordinated flight (slip-skid indicator centered)
• At one weight (typically maximum gross weight)
• At a particular center of gravity (CG) (typically maximum forward CG)
'Airplane Flying Handbook_old' 카테고리의 다른 글
| AFH Chapter 4-12 Stall Characteristics (0) | 2021.07.31 |
|---|---|
| AFH Chapter 4-11 Angle of Attack Indicators (0) | 2021.07.30 |
| AFH Chapter 4-9 Stalls (0) | 2021.07.28 |
| AFH Chapter 4-8 Maneuvering in Slow Flight (0) | 2021.07.27 |
| AFH Chapter 4-7 Performing the Slow Flight Maneuver (0) | 2021.07.26 |
댓글