Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2403

d) the Mode S transponder shall transfer to its ACAS own aircraft’s Mode A identity data for transmission in an RA broadcast (4.3.8.4.2.3.4.5). 4.3.11.3 COMMUNICATION OF ACAS INFORMATION TO OTHER ACAS 4.3.11.3.1 Surveillance reply. The ACAS Mode S transponder shall use the short (DF = 0) or long (DF = 16) surveillance formats for replies to ACAS surveillance interrogations. The surveillance reply shall include the VS field as specified in Chapter 3, 3.1.2.8.2, the RI field as specified in Chapter 3, 3.1.2.8.2 and in 4.3.8.4.1.2, and the SL field as specified in 4.3.8.4.2.5. 4.3.11.3.2 Coordination reply. The ACAS Mode S transponder shall transmit a coordination reply upon receipt of a coordination interrogation from an equipped threat subject to the conditions of 4.3.11.3.2.1. The coordination reply shall use the long air-air surveillance reply format, DF = 16, with the VS field as specified in Chapter 3, 3.1.2.8.2, the RI field as specified in Chapter 3, 3.1.2.8.2 and in 4.3.8.4.1.2, the SL field as specified in 4.3.8.4.2.5 and the MV field as specified in 4.3.8.4.2.4. Coordination replies shall be transmitted even if the minimum reply rate limits of the transponder (Chapter 3, 3.1.2.10.3.7.2) are exceeded. 4.3.11.3.2.1 The ACAS Mode S transponder shall reply with a coordination reply to a coordination interrogation received from another ACAS if and only if the transponder is able to deliver the ACAS data content of the interrogation to its associated ACAS. 4.3.11.4 COMMUNICATION OF ACAS INFORMATION TO GROUND STATIONS 4.3.11.4.1 RA reports to Mode S ground stations. During the period of an RA and for 18±1 s following the end of the RA, the ACAS Mode S transponder shall indicate that it has an RA report by setting the appropriate DR field code in replies to a Mode S sensor as specified in 4.3.8.4.1.1. The RA report shall include the MB field as specified in 4.3.8.4.2.2.1. The RA report shall describe the most recent RA that existed during the preceding 18±1 s period. Note 1.— The last sentence of 4.3.11.4.1 means that for 18±1 s following the end of an RA, all MB subfields in the RA report with the exception of bit 59 (RA terminated indicator) will retain the information reported at the time the RA was last active. Note 2.— Upon receipt of a reply with DR = 2, 3, 6 or 7, a Mode S ground station may request downlink of the RA report by setting RR = 19 and either DI = 7, or DI = 7 and RRS = 0 in a surveillance or Comm-A interrogation to the ACAS aircraft. When this interrogation is received, the transponder replies with a Comm-B reply whose MB field contains the RA report. Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 4-30 4.3.11.4.2 Data link capability report. The presence of an ACAS shall be indicated by its Mode S transponder to a ground station in the Mode S data link capability report. Note.— This indication causes the transponder to set codes in a data link capability report as specified in 4.3.8.4.2.2.2. 4.3.12 Indications to the flight crew 4.3.12.1 CORRECTIVE AND PREVENTIVE RAS Recommendation.— Indications to the flight crew should distinguish between preventive and corrective RAs. 4.3.12.2 ALTITUDE CROSSING RAS Recommendation.— If ACAS generates an altitude crossing RA, a specific indication should be given to the flight crew that it is crossing. 4.4 PERFORMANCE OF THE ACAS II COLLISION AVOIDANCE LOGIC Note.— Caution is to be observed when considering potential improvements to the reference ACAS II system described in Section 4 of the guidance material in the Attachment since changes may affect more than one aspect of the system performance. It is essential that alternative designs would not degrade the performances of other designs and that such compatibility is demonstrated with a high degree of confidence. 4.4.1 Definitions relating to the performance of the collision avoidance logic Note.— The notation [t1, t2] is used to indicate the interval between t1 and t2. Altitude layer. Each encounter is attributed to one of six altitude layers as follows: Layer from 2 300 ft 5 000 ft 10 000 ft 20 000 ft 41 000 ft to 2 300 ft 5 000 ft 10 000 ft 20 000 ft 41 000 ft The altitude layer of an encounter is determined by the average altitude of the two aircraft at closest approach. Note.— For the purposes of defining the performance of the collision avoidance logic, there is no need to specify the physical basis of the altitude measurement or the relationship between altitude and ground level. Approach angle. The difference in the ground headings of the two aircraft at closest approach, with 180 degrees defined as head on and 0 degrees defined as parallel. Crossing encounter. An encounter in which the altitude separation of the two aircraft exceeds 100 ft at the beginning and at the end of the encounter window, and the relative vertical position of two aircraft at the end of the encounter window is reversed from that at the beginning of the encounter window. Chapter 4 Annex 10 — Aeronautical Telecommunications 4-31 22/11/07 Encounter. For the purposes of defining the performance of the collision avoidance logic, an encounter consists of two simulated aircraft trajectories. The horizontal coordinates of the aircraft represent the actual position of the aircraft but the vertical coordinate represents an altimeter measurement of altitude. Encounter class. Encounters are classified according to whether or not the aircraft are transitioning at the beginning and end of the encounter window, and whether or not the encounter is crossing. Encounter window. The time interval [tca – 40 s, tca + 10 s]. Horizontal miss distance (hmd). The minimum horizontal separation observed in an encounter. Level aircraft. An aircraft that is not transitioning. Original trajectory. The original trajectory of an ACAS-equipped aircraft is that followed by the aircraft in the same encounter when it was not ACAS equipped. Original rate. The original rate of an ACAS-equipped aircraft at any time is its altitude rate at the same time when it followed the original trajectory. Required rate. For the standard pilot model, the required rate is that closest to the original rate consistent with the RA. tca. Nominally, the time of closest approach. For encounters in the standard encounter model (4.4.2.6), a reference time for the construction of the encounter at which various parameters, including the vertical and horizontal separation (vmd and hmd), are specified. Note.— Encounters in the standard encounter model (4.4.2.6) are constructed by building the trajectories of the two aircraft outwards starting at tca. When the process is complete, tca may not be the precise time of closest approach and differences of a few seconds are acceptable. Transitioning aircraft. An aircraft having an average vertical rate with a magnitude exceeding 400 feet per minute (ft/min), measured over some period of interest. Turn extent. A heading difference defined as an aircraft’s ground heading at the end of a turn minus its ground heading at the beginning of the turn. Vertical miss distance (vmd). Notionally, the vertical separation at closest approach. For encounters in the standard encounter model (4.4.2.6), by construction the vertical separation at the time tca. 4.4.2 Conditions under which the requirements apply 4.4.2.1 The following assumed conditions shall apply to the performance requirements specified in 4.4.3 and 4.4.4:

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