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time the VOR station is calibrated.
Surface level heliport. A heliport located on the ground or on
the water.
Touchdown and lift-off area (TLOF). A load bearing area on
which a helicopter may touch down or lift off.
1.2 Applicability
1.2.1 The interpretation of some of the specifications in
the Annex expressly requires the exercising of discretion, the
taking of a decision or the performance of a function by the
appropriate authority. In other specifications, the expression
appropriate authority does not actually appear although its
inclusion is implied. In both cases, the responsibility for
whatever determination or action is necessary shall rest with
the State having jurisdiction over the heliport.
1.2.2 The specifications in Annex 14, Volume TI shall,
apply to all heliports intended to be used by helicopters in
international civil, aviation. The specifications of Annex 14,
Volume I shall apply, where appropriate, to these heliports as
well.
1.2.3 Wherever a colour is referred to in this volume,
the specifications for that colour given in Appendix 1 to
Annex 14, Volume I shall apply.
611 1/97
No. 2
CHAPTER 2. HELIPORT DATA
2.1 Aeronautical data
2.1.1 Determination and reporting of heliport related
aeronautical data shall be in accordance with the accuracy and
integrity requirements set forth in Tables 1 to 5 contained in
Appendix I while taking into account the established quality
system procedures. Accuracy requirements for aeronautical
data are based upon a 95 per cent confidence level and in that
respect, three rypes of positional data shall be identified:
surveyed points (e.g. FAT0 threshold), calculated points
(mathematical calculations from the known surveyed points of
points in space, fixes) and declared points (e.g. flight
information region boundary points).
Note. - Specijicalions governing the quality system are
given in Annex IS, Chapter 3.
2.1.2 Contracting States shall ensure that integrity of
aeronautical data is maintained throughout the data process
from surveylorigin to the next inrended user. Aeronautical data
integrity requirements shall be based upon the potential risk
resulting from the corruption of data and upon the use to
which the data item is put. Consequently, the following
classification and data integrity level shall apply:
a) critical data, integrity level I x 10.': there is a high
probability when using corrupted critical data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for catastrophe;
b) essential data, integrity level I x there is a low
probability when using corrupted essential data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for catastrophe; and
c) routine data, integriv level I x 10.;': there is a very low
probability when using corrupted routine data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for catastrophe.
2.1.3 Protection of electronic aeronautical data while
stored or in transit shall be totally monitored by the cyclic
redundancy check (CRC). To achieve protection of the
integrity level of critical and essential aeronautical data as
classified in 2.1.2 above, a 32 or 24 bit CRC algorithm shall
apply respectively.
2.1.4 Recommendation. - To achieve protection of the
integrity level of routine aeronautical data as classified in 2.1.2
above, a 16 bit CRC algorithm should apply.
Note.- Guidance material on the aeronautical data quality
requirements (accuracy, resolution, integrio, protection and
traceability) is contained in the World Geodetic System -
1984 (WGS-84) Manual (Doc 9674). Supporting material zn
respect of the provisions of Appendix I related to accuracy
and integrity of aeronautical datrr, is contained in RTCA
Document DO-201A and European Organizalion for Civil
Aviation Equipment (EUROCAE) Document ED-77, entitled
''Industry Requirements for Aeronautical Information".
2.1.5 Geographical coordinates indicating latitude and
longitude shall be determined and reported to the aeronautical
information services authority in terms of the World Geodetic
System - 1984 (WGS-84) geodetic reference datum,
identifying those geographical coordinates which have been
transformed illto WGS-84 coordinates by mathematical means
and whose accuracy of original field work does not meet the
requirements in Appendix 1, Table 1.
2.1.6 The order of accuracy of the field work shall be
such that the resulting operational navigation data for the
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