Document ID: chunk:federal_register_of_legislation:F2018C00889:reg:22:p2
Version: federal_register_of_legislation:F2018C00889
Segment Type: reg
Provision Reference: reg 22 (pt 2/26)
Character Range: 171753–174552

the U.S. National Airspace System;
(d) EASA AMC 20-27 — Airworthiness Approval and Operational Criteria for RNP APPROACH (RNP APCH) Operations, including BARO-VNAV Operations;
(e) an approval issued in the aircraft's State of operation or registry, and which is assessed by CASA as meeting requirements that are the same as, or equivalent to, the standards of eligibility set out in this clause;
(f) a CASA assessment of the aircraft which results in a CASA determination that the aircraft meets the standards for eligibility set out in this clause.

3 Baro-VNAV system performance
       3.1 To meet the requirements of clause 2 of this Appendix, an eligible aircraft's Baro-VNAV system used in Baro-VNAV operations must meet the following performance standards:
(a) the performance requirements set out in FAA AC 20-129 — Airworthiness Approval of Vertical Navigation (VNAV) Systems for use in the United States National Airspace System (NAS) and Alaska; or
(b) the performance requirements set out in FAA AC 20-138B — Airworthiness Approval of Positioning and Navigation Systems;
(c) a demonstration to CASA that the VNAV TSE, including altimetry errors, is less than 75 m (246 ft) for a probability of 99.99%.
       3.2 For the purposes of the demonstration mentioned in paragraph 5.1 (c), the VNAV TSE analysis is to include all of the following:
(a) altimetry errors, including allowance for accuracy of reported barometric pressure (ATIS error);
(b) VNAV system error, including VPA resolution error;
(c) waypoint resolution error;
(d) FTE.
Note   Provision for RNAV along-track system error is not included.

4 Baro-VNAV system functionality
       4.1 To meet the requirements of clause 3 of this Appendix and subject to subclause 4.2, an eligible aircraft's Baro-VNAV system must have the following functionality in Baro-VNAV operations:
(a) the system must be able to load the entire procedure to be flown into the RNP system from the on-board navigation database, including the approach, the missed approach and the approach transitions for the selected aerodrome and runway;
(b) the system must make it impossible for the flight crew to modify instrument approach procedure data;
(c) the resolution of VPA entry (from the navigation database) and display must be no greater than 0.1;
(d) the vertical path must be defined by a waypoint and a vertical angle;
(e) vertical deviation from the defined VNAV path must be continuously displayed in the primary field of view of the pilot or each pilot, as the case requires;
(f) vertical deviation resolution must be not more than 10 ft;
(g) for aircraft with a flight crew of 2 pilots — a barometric altitude from 2 independent sources must be displayed, 1 in each pilot's primary field of view;
(h) there must be a means for the flight crew