getting to grips with aircraft performance 如何掌握飞机性能 2(7)

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However, when flap deflection increases, drag increases thus penalizing the aircraft’s climb performance.
Landing Distance . 
Wing Flap Deflection . . 
Air Climb gradient γ % . 

When landing at a high altitude airport with a long runway, it might be better to decrease the flap setting to increase the go-around air climb gradient.

4. DISPATCH REQUIREMENTS
4.1. Required Landing Distance (RLD)

It is assumed “that the aeroplane will land on the most favorable runway, in still air”. Furthermore, “the aeroplane will land on the runway most likely to be assigned considering the probable wind speed and direction and the ground handling characteristics of the aeroplane, and considering other conditions such as landing aids and terrain”.
Before departure, operators must check that the Landing Distance Available (LDA) at destination is at least equal to the Required Landing Distance (RLD) for the forecasted landing weight and conditions.
The RLD, based on certified landing performance (ALD), has been introduced to assist operators in defining the minimum distance required at destination, and allow flight dispatch.
In all cases, the requirement is : RLD ≤
 LDA
Operators must take into account the runway slope, when its value is greater than ± 2%. Otherwise, it is considered to be null.
In the event of an aircraft system failure, known prior to dispatch and affecting the landing distance, the available runway length must at least be equal to the required landing distance with failure. This distance is equal to the required landing distance without failure multiplied by the coefficient given in the MMEL, or to the performance with failure given by the Flight Manual.
4.1.1. RLD Dry Runways

The aircraft’s landing weight must permit landing within 60% of the Landing Distance Available at both the destination and any alternate airport. That gives:
RLD dry = ALD / 0.6 ≤
 LDA
4.1.2. RLD Wet Runways

If the surface is wet, the required landing distance must be at least 115% of that of a dry surface.

RLD wet = 1.15 RLD dry ≤
 LDA
A landing distance on a wet runway, shorter than that above but no less than that required on a dry runway, may be used if the Airplane Flight Manual includes specific additional information about landing distances on wet runways. This is not generally the case for Airbus aircraft.
4.1.3. RLD Contaminated Runways

For JAR operators, if the surface is contaminated, the required landing distance must be at least the greater of the required landing distance on a wet runway and 115% of the landing distance determined in accordance with approved contaminated landing distance data.
ALD contaminated x 1.15 
RLD contaminated = the greatest of  or 
RLD wet 

For contaminated runways, the manufacturer must provide landing performance for speed V at 50 feet above the airport, such that:
　
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