AMC1 ACNS.C.PBN.805 RF functional
requirements
ED Decision 2019/011/R
The applicant should perform an evaluation of the navigation system on a representative set of procedure designs under all foreseen operating conditions. The evaluation should address maximum assumed crosswind and maximum altitude with the aircraft operating in the range of expected airspeeds for the manoeuvre and operating gross weights and CG conditions (i.e. forward/aft). Procedure design constraints should include sequencing multiple, consecutive RF leg segments of varying turn radii, including consecutive RF leg segments reversing the direction of turn (i.e. reversing from a left-hand RF turn to a right-hand RF turn).
When evaluating flight technical error on RF legs, the effect of rolling into and out of the turn should be considered.
Within the demonstration, the applicant should be seeking to confirm that the FTE is commensurate with the RNP navigation accuracy.
Where applicable, the ability of the aircraft to maintain an appropriate FTE after a full or partial failure of the autopilot and/or flight director should also be demonstrated.
Any limitations identified during the compliance demonstration should be documented. Flight crew procedures should be assessed, including identification of any limitations which surround the use of pilot selectable or automatic bank angle limiting functions and confirmation of those related to go-around or missed approach from an RF leg segment.
Test procedures for aircraft capability to perform RF legs in approach and departure should make use of the RF leg demonstration templates described in Appendix D to Subpart C.
[Issue: CS-ACNS/2]
Aircraft navigation system evaluation for Required Navigation Performance (RNP) authorization must assess performance under diverse conditions, including challenging RF leg procedures with consecutive turns and airspeed variations. Flight technical error (FTE) must align with RNP accuracy, even after autopilot failures. Limitations and crew procedures, especially during go-arounds, require documentation. Standardized RF leg demonstration templates should be used.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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