Document ID: chunk:federal_register_of_legislation:F2005L04061:body:0:p12
Version: federal_register_of_legislation:F2005L04061
Segment Type: other
Provision Reference: 
Character Range: 30395–33157

3.5.5.1The baseline RNP 10 time limit of 6.2 hours for INS and IRU systems after the system is placed in the navigation mode may be extended by 1 of the following methods:

(a) integration of the RNP into the aircraft navigation system through a formal certification process (as described in subsection 3.5.2);

(b) if INS or IRU has been approved using an existing approval standard (as detailed in 3.5.3.3, 3.5.3.4 and 3.5.3.5) — presentation of justifying data by an applicant;

      Note 1   Data collected by 1 or more operators may be used as the basis for a group approval.

      Note 2   An approved means of analysing the certification of IRU performance and amending the existing approval in aircraft documentation is described in AC 91.U-2(0) Appendix 2.

(c) showing that the carriage of multiple navigation sensors, that mix or average navigation position error, justifies the extension (eg triple mixed INSs);

Note 1   If a time limit based on mixing is used, the mixing capability must be operational at take-off for RNP 10 operations.

Note 2   If the mixing or averaging function is not available at take-off, a time limit that does not depend on mixing must be used.

(d) if INS or IRU has been approved using an existing approval standard — conducting a data collection program in accordance with AC 91.U-2(0) Appendices 1 or 6.

3.5.6 Effect of en-route updates

       3.5.6.1An operator may extend RNP 10 navigation capability time by using updating.

       3.5.6.2The updating procedures are based upon the baseline for which they have been approved minus the following times:

(a) automatic updating DME/DME — 0.3 hours (eg an aircraft that has been approved for 6.2 hours can gain 5.9 hours following an automatic DME/DME update);

(b) automatic updating using DME/VOR — 0.5 hours;

(c) manual updating using the approved methods described in AC 91.U-2(0) Appendix 7 or another method approved by CASA — 1 hour.

3.5.7 Conditions under which automatic radio position updating is acceptable for flight in airspace where RNP 10 is applied

       3.5.7.1Automatic updating (i.e. that does not require flight crew to manually insert coordinates) is acceptable if:

(a) the procedures for automatic updating are included in an operator's training program; and

(b) the flight crews have knowledge of the updating procedures and of the effect of the update on the navigation solution; and

(c) if it is to be used as the basis for an extended time limit — the data presented must give a clear indication of the accuracy of the update and the effect of the update on the navigation capabilities for the remainder of the flight.

3.5.8 Conditions under which manual radio position updating may be acceptable for flight in airspace where RNP