Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2545

c) either a miss distance estimate could not be calculated on the current cycle or the calculated miss distance is less than Hm; and for all other conditions the result of the range test is negative. Note.— The formula in item a) 2) above provides a practical text for the following condition: the range and range rate estimates indicate that the encounter could be such that the linear miss distance is less than or equal to Dm and the linear time to closest approach is less than T. 4.3.3.3.1 The values of the parameters T, Dm and Hm are as follows: S T s Dm (km) 0.37 0.65 1.0 1.5 2.0 (Dm (NM) 0.20 0.35 0.55 0.80 1.1) Hm (m) 1 019 1 483 2 083 (Hm (ft) 1 251 2 126 3 342 4 861 6 683) Attachment Annex 10 — Aeronautical Communications ATT-47 22/11/07 4.3.4 ALTITUDE TEST 4.3.4.1 ALTITUDE TEST TERMS’ DESCRIPTION Altitude divergence rate ( ) a . The rate of change of a. Current altitude separation (a). The modulus of the current tracked altitude separation between own aircraft and the intruder. Times to closest approach (τu, τm). The estimated time which will be taken to reach minimum range. τu is the maximum value (assuming rectilinear relative motion and zero miss distance) and τm is the minimum value (assuming rectilinear relative motion and the maximum miss distance of interest, Dm). Time to co-altitude (τv). The estimated time which will be taken to reach co-altitude. Vertical miss distance (vm). An estimated lower bound for the projected altitude separation at the estimated time of closest approach. 4.3.4.2 Current altitude separation. Current altitude separation is declared “small” if a < Zt where Zt is set equal to Zm (4.3.4.4.2) in the reference logic. 4.3.4.3 ALTITUDE CONVERGENCE 4.3.4.3.1 a is calculated as follows: for o i o i a z z z z = − − ≥    for i o o i a z z z z = − − <    4.3.4.3.2 The aircraft are declared converging in altitude if a < c Z − . 4.3.4.3.3 The value of c Z − is positive and not greater than 0.3 m/s (60 ft/min). 4.3.4.4 VERTICAL MISS DISTANCE 4.3.4.4.1 When the aircraft are converging in range ( r ≤ 0), time to closest approach and vertical miss distance are calculated as follows: r′ = minimum ( r , tR − ) τu = minimum ( / r r′ , T) τu = 2/ )/ m r D r r − ′ for r ≥ Dm = 0 for r < Dm Annex 10 — Aeronautical Communications Volume IV 22/11/07 ATT-48 vm1 = (zo – zi) + (żo – żi) τu vm2 = (zo – zi) + (żo – żi) τm vm = 0 for vm1vm2 ≤ 0, otherwise vm = minimum (vm1, vm2) for vm1 > 0 = maximum (vm1, vm2) for vm1 < 0 4.3.4.4.2 Vertical miss distance is declared “small” if |vm|< Zm. The maximum values for Zm are given by: zo FL below 200 200 to 420 above 420 Zm (m) (Zm (ft) 800) 4.3.4.5 TIME TO CO-ALTITUDE 4.3.4.5.1 The time to co-altitude for a less than c Z − is calculated as follows: / v a a τ = −  Note.— τv is not used if the aircraft are not converging in altitude and range. 4.3.4.5.2 τv is declared “small” if τv < Tv for encounters in which the magnitude of own aircraft’s vertical rate is not more than 600 ft/min or own aircraft’s vertical rate has the same sign as but smaller magnitude than that of the intruder. For all other encounters τv is declared “small” if τv < T. The values of the parameters Tv are as follows: S Tv s 4.3.4.6 Altitude test criteria. The altitude test of the reference logic gives a positive result when any of the three following conditions are satisfied:

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