Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2230

c) Selective: for surveillance of, and communication with, individual Mode S transponders. For each interrogation, a reply is elicited only from the transponder uniquely addressed by the interrogation. Note 1.— Mode A/C transponders are suppressed by Mode S interrogations and do not reply. Note 2.— There are 25 possible interrogation (uplink) formats and 25 possible Mode S reply (downlink) formats. For format assignment see 3.1.2.3.2, Figures 3-7 and 3-8. 2.1.2.1.1 Recommendation.— Administrations should coordinate with appropriate national and international authorities those implementation aspects of the SSR system which will permit its optimum use. Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 2-2 Note.— In order to permit the efficient operation of ground equipment designed to eliminate interference from unwanted aircraft transponder replies to adjacent interrogators (defruiting equipment), States may need to develop coordinated plans for the assignment of pulse recurrence frequencies (PRF) to SSR interrogators. 2.1.2.1.2 The assignment of interrogator identifier (II) codes, where necessary in areas of overlapping coverage, across international boundaries of flight information regions, shall be the subject of regional air navigation agreements. 2.1.2.1.3 The assignment of surveillance identifier (SI) codes, where necessary in areas of overlapping coverage, shall be the subject of regional air navigation agreements. Note.— The SI lockout facility cannot be used unless all Mode S transponders within coverage range are equipped for this purpose. 2.1.2.2 Mode A and Mode C interrogations shall be provided. Note.— This requirement may be satisfied by intermode interrogations which elicit Mode A and Mode C replies from Mode A/C transponders. 2.1.2.3 Recommendation.— In areas where improved aircraft identification is necessary to enhance the effectiveness of the ATC system, SSR ground facilities having Mode S features should include aircraft identification capability. Note.— Aircraft identification reporting through the Mode S data link provides unambiguous identification of aircraft suitably equipped. 2.1.2.4 SIDE-LOBE SUPPRESSION CONTROL INTERROGATION 2.1.2.4.1 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.1.4 and 3.1.1.5 on all Mode A, Mode C and intermode interrogations. 2.1.2.4.2 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.2.1.5.2.1 on all Mode S-only all-call interrogations. 2.1.3 Transponder reply modes (air-to-ground) 2.1.3.1 Transponders shall respond to Mode A interrogations in accordance with the provisions of 3.1.1.7.12.1 and to Mode C interrogations in accordance with the provisions of 3.1.1.7.12.2. Note.— If pressure-altitude information is not available, transponders reply to Mode C interrogations with framing pulses only. 2.1.3.1.1 The pressure-altitude reports contained in Mode S replies shall be derived as specified in 3.1.1.7.12.2. Note.— 3.1.1.7.12.2 is intended to relate to Mode C replies and specifies, inter alia, that Mode C pressure-altitude reports be referenced to a standard pressure setting of 1 013.25 hectopascals. The intention of 2.1.3.1.1 is to ensure that all transponders, not just Mode C transponders, report uncorrected pressure-altitude. 2.1.3.2 Where the need for Mode C automatic pressure-altitude transmission capability within a specified airspace has been determined, transponders, when used within the airspace concerned, shall respond to Mode C interrogations with pressure-altitude encoding in the information pulses. Chapter 2 Annex 10 — Aeronautical Telecommunications 2-3 22/11/07 2.1.3.2.1 From 1 January 1999, all transponders, regardless of the airspace in which they will be used, shall respond to Mode C interrogations with pressure-altitude information. Note.— Operation of the airborne collision avoidance system (ACAS) depends upon intruder aircraft reporting pressure-altitude in Mode C replies. 2.1.3.2.2 For aircraft equipped with 7.62 m (25 ft) or better pressure-altitude sources, the pressure-altitude information provided by Mode S transponders in response to selective interrogations (i.e. in the AC field, 3.1.2.6.5.4) shall be reported in 7.62 m (25 ft) increments. Note.— Performance of the ACAS is significantly enhanced when an intruder aircraft is reporting pressure-altitude in 7.62 m (25 ft) increments. 2.1.3.2.3 All Mode A/C transponders shall report pressure-altitude encoded in the information pulses in Mode C replies. 2.1.3.2.4 All Mode S transponders shall report pressure-altitude encoded in the information pulses in Mode C replies and in the AC field of Mode S replies. 2.1.3.2.5 When a Mode S transponder is not receiving more pressure-altitude information from a source with a quantization of 7.62 m (25 ft) or better increments, the reported value of the altitude shall be the value obtained by expressing the measured value of the uncorrected pressure-altitude of the aircraft in 30.48 m (100 ft) increments and the Q bit (see 3.1.2.6.5.4 b)) shall be set to 0. Note.— This requirement relates to the installation and use of the Mode S transponder. The purpose is to ensure that altitude data obtained from a 30.48 m (100 ft) increment source are not reported using the formats intended for 7.62 m (25 ft) data. 2.1.3.3 Transponders used within airspace where the need for Mode S airborne capability has been determined shall also respond to intermode and Mode S interrogations in accordance with the applicable provisions of 3.1.2. 2.1.3.3.1 Requirements for mandatory carriage of SSR Mode S transponders shall be on the basis of regional air navigation agreements which shall specify the airspace and the airborne implementation timescales. 2.1.3.3.2 Recommendation.— The agreements indicated in 2.1.3.3.1 should provide at least five years’ notice. 2.1.4 Mode A reply codes (information pulses) 2.1.4.1 All transponders shall be capable of generating 4 096 reply codes conforming to the characteristics given in 3.1.1.6.2. 2.1.4.1.1 Recommendation.— ATS authorities should establish the procedures for the allotment of SSR codes in conformity with Regional Air Navigation agreements, taking into account other users of the system. Note.— Principles for the allocation of SSR codes are given in Doc 4444, Chapter 8. 2.1.4.2 The following Mode A codes shall be reserved for special purposes: 2.1.4.2.1 Code 7700 to provide recognition of an aircraft in an emergency. 2.1.4.2.2 Code 7600 to provide recognition of an aircraft with radiocommunication failure. 2.1.4.2.3 Code 7500 to provide recognition of an aircraft which is being subjected to unlawful interference. Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 2-4 2.1.4.3 Appropriate provisions shall be made in ground decoding equipment to ensure immediate recognition of Mode A codes 7500, 7600 and 7700. 2.1.4.4 Recommendation.— Mode A code 0000 should be reserved for allocation subject to regional agreement, as a general purpose code. 2.1.4.5 Mode A code 2000 shall be reserved to provide recognition of an aircraft which has not received any instructions from air traffic control units to operate the transponder. 2.1.5 Mode S airborne equipment capability 2.1.5.1 All Mode S transponders shall conform to one of the following five levels: 2.1.5.1.1 Level 1 — Level 1 transponders shall have the capabilities prescribed for:

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