Safety separation for paired approach

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... approach refers to the procedure where two aircrafts simultaneously conduct approach operations on closely spaced parallel runways with a centerline spacing ranging from 700 to 2500 feet as shown in Fig. 1. During the paired approach process, the trailing aircraft needs to maintain a position between the Collision Safety Limit (CSL) and the Wake Safety Limit (WSL) to avoid collision with the lead aircraft and encountering wake turbulence. CSL takes into account unexpected situations where the lead aircraft deviates before pairing. If it ...

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... on the research on the Collision Risk Model (CRM) by the ICAO, the horizontal and the vertical position errors of the aircraft follow a Gaussian distribution. In this study, the heading deviation angle and its probability distribution for the lead aircraft are set as shown in Table 2 and Fig. 4 ...

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... aircraft. It can be observed from Fig. 9 that when the releasing position of the lead aircraft is approximately 2 NM from the runway threshold, the safety separation for both approach modes nearly coincides. The data mentioned above was further transformed into a line graph to visually represent the correlations between the variables as shown in Fig. 10. Red, yellow, and blue lines represent the trends of safety separation with respect to the lead aircraft's distance to the runway threshold at 20 NM, 14 NM, and 8 NM, respectively. There is a certain degree of correlation observed between lines of the same color. The solid lines represent the results of the straightin approach by the ...

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... varying the RCLS to 250 m and 550 m, while keeping other parameters constant, and using the straight-in approach for aircraft pairing, several simulations were conducted. The scatter plot of the simulation results is shown in Fig. 11, where it can be observed that the overall trend of the scatter plot aligns with the conclusion that the safety separation decreases as the aircraft speed compression and the proximity of the lead aircraft to the runway threshold increase. In fact, the distance between the runway centerlines directly determines the lateral separation ...

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... fact, the distance between the runway centerlines directly determines the lateral separation between the paired aircraft during a paired approach, thereby indirectly affecting the lateral collision risk in the paired approach. Figure 12 provides a visual analysis of the variation trend in safety separation for paired approach. Red, blue, and brown lines represent simulation results for speed intervals of [1,5), [5,10), and [10,15), respectively. ...

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... simulation results are shown in Fig. 13. From the above figure, it can be observed that the results of the three combinations of aircraft wake turbulence category matching are similar, and there are no significant differences among them. Therefore, the pairing of aircraft wake turbulence categories does not have a significant impact on the collision safety limit during ...