AMC1 ACNS.C.PBN.1005 Parallel offset
capabilities
ED Decision 2019/011/R
The installation of equipment with an ETSO authorisation against ETSO-C115d, Class A, satisfies the requirement.
For RNP systems that have not been granted an ETSO authorisation against ETSO-C115d, Class A, the requirements of ED-75D (RTCA DO-236C Change 1) Section 3.7.2.2.4 ‘Parallel Offsets’ apply, with the following additions:
(a) The RNP system should have the capability to define the offset path from the parent track using an increment of at least 1 NM, left or right and with a total offset of at least 20 NM. Where the RNP system supports the definition of a single, pre-planned parallel offset using specific start and end fixes, the RNP system should:
(1) provide automatic initiation and cessation of the offset at the start and end waypoint;
(2) begin transition to the offset path at the start waypoint on the original path to join the intercept path;
(3) begin the return to the original path so that the return transition ends at the end waypoint on the original path.
With reference to CS ACNS.C.PBN.1005(a) (3)(iii), cases which are not compatible with an offset are considered to be:
(i) arrival at a fix where a course change exceeds 120 degrees;
(ii) a route segment that ends at a hold fix.
(b) When executing a parallel offset, the RNP system computes the offset reference points using the same resolution that the parent route reference points have. Where FRTs are applied, the offset track should be flown with the same turn radius as the parent track.
[Issue: CS-ACNS/2]
EASA compliant aircraft RNP systems must support parallel offset capabilities. Equipment with ETSO-C115d Class A authorization meets requirements. Otherwise, follow ED-75D standards with additions for offset path definition (at least 1 NM increments, up to 20 NM). Automatic offset initiation/cessation and specific turn radius are needed, excluding incompatible course changes or holding fixes.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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