OTAR 139 Certification of Aerodromes - Air Safety Support ...

Certification of Aerodromes Part 139 141(d)To achieve protection of the integrity level of routine aeronautical data asclassified in paragraph 139.I.03(b) above, a 16 bit CRC algorithm shall apply.(e) Geographical coordinates indicating latitude and longitude shall bedetermined and reported to the aeronautical information services authority interms of the World Geodetic System — 1984 (WGS-84) geodetic referencedatum, identifying those geographical coordinates which have beentransformed into WGS-84 coordinates by mathematical means and whoseaccuracy of original field work does not meet the requirements in ICAO Annex14, Volume II, Appendix 1, Table 1.(f)(g)The order of accuracy of the field work shall be such that the resultingoperational navigation data for the phases of flight will be within the maximumdeviations, with respect to an appropriate reference frame, as indicated intables contained in ICAO Annex 14, Volume II, Appendix 1.In addition to the elevation (referenced to mean sea level) of the specificsurveyed ground positions at heliports, geoid undulation (referenced to theWGS-84 ellipsoid) for those positions as indicated in ICAO Annex 14, VolumeII, Appendix 1, shall be determined and reported to the aeronauticalinformation services authority.139.I.05 Heliport reference point(a)(b)(c)(d)A heliport reference point shall be established for a heliport not co-locatedwith an aerodrome.When the heliport is co-located with an aerodrome, the establishedaerodrome reference point serves both aerodrome and heliport.The heliport reference point shall be located near the initial or plannedgeometric centre of the heliport and shall normally remain where firstestablished.The position of the heliport reference point shall be measured and reported tothe AIS authority in degrees, minutes and seconds.139.I.07 Heliport elevation(a)The heliport elevation and geoid undulation at the heliport elevation positionshall be measured and reported to the aeronautical information servicesauthority to the accuracy of one-half metre or foot.(b) For a heliport used by international civil aviation, the elevation of thetouchdown and lift-off area and/or the elevation and geoid undulation of eachthreshold of the final approach and take-off area (where appropriate) shall bemeasured and reported to the aeronautical information services authority tothe accuracy of:(1) one-half metre or foot for non-precision approaches; and(2) one-quarter metre or foot for precision approaches.Air Safety Support International (ASSI) Issue 5 Overseas Territories Aviation Requirements