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~zctivities should be kept as sniall as possible;
c) direct con~rnrrnication between the appropriate ATS
authorit?. or air tr@ic senices unit and the organi,-ation
or rrnit conductir~~thye activities should be provided for
rfse irl the event that civil aircrafr emergencies or other
~inforesecnc ircumstances require discorrtinuation. oj'ttle
activities.
2.17.3 The appropriate ATS authorities shall bc responsible
for initiating the promulgation ol' incormation regarding h e
activities.
2.17.4 Recommendation.- If acfivities potentially
hazardorrs to civil aircraff take place on a regular or continuing
basis, special com)nittees should be established as reqrdired lo
ensirre that the requirements of all parties concerned are
adeqrrately coordinated.
Nor<.- Speci,fificutio~g~os veuti?zg l!?e y;rulih: syste.n? arc
given in A111res 15. Chapter 3.
2.18.2 Contracting States shall ensure that integrity of
aeron;ii~~ioadla ta is maintained throughout the data process
from surveylorigin to the next intended user. Aeronautical data
integrity requirements shall be based upon the potential risk
resulting from the conuption of data and upon the usc to
which the data item is put. Consequently, the Collo\ving
classification and data integrity levcl shall apply:
a) critical data, integrity level 1 x lhcrc is a high
probability when using cormpted critical data that the
continued safe flight and landing oC an aircraft would be
severely at risk with the potential lor catastrophe:
b) essential data, Integrity leircl 1 x lW5: there is a low
probability when using cormpled essentia\ data lhal the
continued safe flight and landing of an aircraft would bc
severely at risk with thc potential for catastrophe; aid
c) routine data, integrity level 1 x lo3: there is a very low
probability when using cormpted routine data that the
continued safe flight and landing of an aircraft would be
severely at risk with thc polential for catastrophe.
2.17.5 Adequate steps shall be taken to prevent: emission 2.18.3 Protection of electronic aeronautical data while
of laser beams from adversely affecting flight operations. stored or in transit shall he totally monitored by the cyclic
redundancy chcck (CRC). To achicve protection of (he
Note I.- Guidance material regarding die hazardolis eflec.ts integrity level of critical and essential aeronautical data as
of laser emitters onflight operations is corzt~linedin rile Manual classilied in 2.18.2, a 32- or 24-bit CRC algorithm shall apply
on Laser Emittcrs and Flight SaCcly (Doc 9815). respectively.
Note 2.- See also Annex 14 - Aerodromes, Volrimc I -
Aerodrornc Design and Opcralions, Chapter 5.
2.17.6 Recommendation.- In order to provide added
airsj~ace capacie and to i m p m eflcienq and flexibiliiy of
aircrafr operations, States slrould establish procedures providing
for a j7exible lise qf airspace resc,n;ed for rnilitcrrx or
ot1rt.r special activiries. Ttte procedures sholrlcl pennit all
airspace users to Izave safe access to such reser~:edu irspace.
2.18 Aeronautical data
2.18.1 Detem~ination and reporting of air trafCic servicesrelated
aeronaulical data shall be in accordance with the
accuracy and integrity requirements set forth in Tables 1 to 5
contained in Appendix 5 while taking into account the
established quality system procedures. Accuracy requirements
for aeronautical data are based upon a 95 pcr cent confidence
level, and in that respect three types of positional data shall be
identified: surveyed points (e.g. nwigation aids positions).
calculated points (mathematical calculations from the known
surveyed points or points in space. fixes) and declared points
(e.g. flight infonnatjon region boundary points).
2.18.4 Recommendatinn.- To nchieve protection of the
integrity level of routine aeronautical data LIS clu~~ifieidn
218.2, LI 16-bit CKC algorirhnz should apply
Note.- Guidance mater-icrl on the aer-onauficul data qua1ir.v
requirements (accrrrac?; resollition, integrity, protection and
traceability) is corztait~ed in the World Geodetic System -
1984 (WGS-84) Manual (Lloc 9674). Srtpporring ninterial in
respect of the provisions of Appendix 5 related to accurac?.
and bllegrit). nj~nerorinl~ricdual ta is contained irr RTCA Docrrmcnr
110-2UlA and Europearz Organization jor Civil Aviation
Equipment (EUROCAE) nocrrmcnt ED-77 - Industry
Kcquire~nentsf or Aeronautical TnComation.
2.18.5 Geographical coordinates indicating laritude and
longitude shall be determined and reported lo the aeronautical
information services authority in terms of thc World Geodciic
System - 1984 (WGS-84) geodetic reference datum, idcntifying
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