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pressure altitude encoded in 7.62 m (25 ft) increments in the AC field of Mode S replies from 1 January 2005.
2.1.3.2.6 When a Mode S transponder reports altitude in 7.62 m (25 fl) 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 7.62 m
(25 ft) increments.
Note.- This requirement relates to the irtstallution ard use of the Mode S transponder: The purpose is to ensure that
altitude data obtained from a 30.48 m (100fr)in crement source are not reported using the formats intended for 7.62 m
(25ft) 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 Requiremenls 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 leastjive 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 .I .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, Chnpter 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
2.1.4.3 Appropriate provisions shall be made in ground decoding equipment lo ensure immediate recognition of
Mode A codes 7500, 7600 and 7700.
2.1.4.4 Recommendation.- Mode A code 0000 should be reserved for allocatiorz subject to regional ugreernent, as
a general purpose code.
2.1.4.5 Mode A code 2000 shall be reserved to provide iecognidon of an aircraft which has not received any
instructions from air traffic control units to operate the transponder.
Annex 10 - Aeronauiical Telecommunicaiions Volume IV
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 I transponders shall have the capabilities prescribed for:
a) Modc A identity and Mode C pressure-altitude reporting (3.1.1 );
b) intermode and Mode S all-call transactions (3.1.2.5);
c) addressed surveillance altitude and identity transaction (3.1.2.6.1, 3.1.2.6.3, 3.1.2.6.5 and 3.1.2.6.7);
d) lockout protocols (3.1.2.6.9);
e) basic data protocols except data link capability reporting (3.1.2.6.10); and
f ) air-air service and squitter transactions (3.1.2.8).
Nore.- Level I permits SSR surveillance based on pressure-altitude reporting and the Mode A identity code. In an SSR
Mode S environment, tcchnical perjorrance relative to u Mode A/C transponder is improved due to Mode S selective
aircrafc interrogation.
2.1.5.1.2 Level 2 - Level 2 transponders shall have the capabilities of 2.1.5.1.1 and also those prescribed for:
a) standard length communications (Comm-A and Comm-B) (3.1.2.6.2, 3.1.2.6.4, 3.1.2.6.6, 3.1.2.6.8 and
3.1.2.6.11);
b) data link capability reporting (3.1.2.6.10.2.2); and
c) aircraft identification reporting (3.1.2.9).
Note.- Level 2 permits aircraft identification reporting and other standard length data link communications from.
ground to air and air to ground. The aircraft identification reporting capability requires an intelface and appropriate input
device.
2.1.5.1.3 Level 3 - Level 3 transponders shall have the capabilities of 2.1.5.1.2 and also those prescribed for groundto-
air extended length message (ELM) communications (3.1.2.7.1 to 3.1.2.7.5).
Note.- Level 3 permits extended length data link communications from ground to air und thus may provide retrieval
from ground-based data banks and receipt of other air traflc services which are not available with Level 2 tran,sponders.
2.1.5.1.4 Level 4 - Level 4 transponders shall havc the capabilities of 2.1.5.1.3 and also those prescribed for air-toground
extended length messagc (ELM) communications (3.1.2.7.7 and 3.1.2.7.8).
Note.- Level 4 pennits extended length data link comnzunications from air to ground and thus may provide access from
the ground fo airborne data sources und the transmission of other dutu rcquired by air traflc services which are not
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