Appendix B — INS/IRU
standard performance and functionality
ED Decision 2019/011/R
(1) Introduction
Appendix B provides the performance and functionality criteria that an airborne INS/IRU position source should meet to support PBN operations.
(2) INS/IRU position source standard performance and functionality
(a) The equipment should support an unambiguous indication when its outputs are invalid.
(b) The navigation function of the equipment should be designed commensurate with a ‘major’ failure condition.
(c) The alignment, updating, and navigation computer functions of the system must not be invalidated by normal aircraft power transients.
(d) The equipment should provide or support the following functions and displays:
(i) valid ground alignment capability at all latitudes appropriate for the intended use of the installation;
(ii) a display of alignment status; and
(iii) the present position of the aeroplane in suitable coordinates.
(e) The
circular error of the equipment should be lower than or equal to 2 nautical
miles per
flight hour on a 95-per-cent basis.
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