Term
| Principal 3 Factors afecting V-Speeds |
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Definition
1.-Aerodrome conditions: temperature, pressure, elevation, winds, runway length (TODA or ASDA) slope, runway conditions...etc
2.-Aircraft coditions: Gross weight, Center of gravity, maintenance...etc.
3.-Aircraft configuration: Flaps/Slats, bleed, air conditioning, Anti-ice, Anti-skid..etc. |
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Definition
| Minimun control on ground speed: Minimun directional control on ground if the critical engine fails. If the speed is higher, if the critical engine fails, we will have enough control with the rudder to compensate the yaw moment. |
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Definition
| Engine failure recognition or decision speed. Maximun speed in the take off when the pilot must take the firs action (apply brakes, reduce thrust, deploy speed brakes...) to stop the airplane within the ASDA. Higher than this, the take off must be completed and the requiered height above the take off surface can be achieved. This means that the airplane must be controllable so V1 must be grater than Vmcg. |
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Term
| Lower part of the white arc of the ASI |
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Definition
| Vso: Stall speed with flaps fully extended. |
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Term
| Highest part of the white arc of the ASI |
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Definition
| Vfe: Maximun speed with flaps extended. |
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Term
| Lower part of the green arc of the ASI |
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Definition
| Vs1: Stalling speed wit flaps retracted. |
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Term
| Highest part of the green arc of the ASI |
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Definition
| Vno. Normal operation. If higher do not use full stick manouvres or on severe turbulences. |
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Definition
| Vne: Never exceed speed. Do not exeed this speed because the integrity of the aircraft is compomised. |
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Definition
| Vyse:Single engine best climb airspeed. |
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Term
| Red line in the lower part of the ASI |
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Definition
| Vmca: minimun control on the air. Below this speed, with an engine failure, the aircraft is not controlable in yaw because of the moment of the remaining engine. |
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Term
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Definition
Take off safety speed. It is the minimun speedthat needs to be mantained up to acceleration altitude, in the event of an engine failure after V1. Flight at V2 ensures that the minimun requiered climb gradient is achieved and the aircraft is controllable.
V2 is alway greater than Vmca.
In all-engines operative take off, V2+10 provides a better climb performance than V2. |
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| Steady initial climb speed. The all engines operating take off climb speed where acceleration to flap retraction speed is initiated. Should be attained at a gross height of 400ft. |
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| Manouvering speed. Do not use full application of any single flight control because of structural limits. |
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Definition
| Indicated Airspeed at treshold wich is equial to stall speed (Vs0)x1.3 or Vs1gx1.23 in the landing configuration at the maximun certified landing mass. If both Vso and Vs1g are available, we use the higher one. It's also called approach speed. |
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Definition
| Design speed for maximun gust intensity. |
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Definition
| Design cruise speed, used to show compliance with gust intensity loading. |
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Definition
| V1 in military aircrafts. |
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| Demonstarrated flight diving speed. |
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Definition
| Speed at which the critical engine is assumed to failduring take off. |
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| Designed speed for stability characteristics. |
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| Maximun speed with flaps extended. |
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Definition
| maximun speed in level flight at maximun continuous power. |
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