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appropriate for the routes/tracks to be flown
COM — Voice communications through a third party
SUR — Procedural-pilot position reports.
b) RNP 12.6
Spacing: 110 km (60 NM);
Basis: Collision risk model performed for NAT
Organized Track Structure (Report of the Limited/North
Atlantic Regional Air Navigation Meeting (1976)
(Doc 9182)); and
Minimum ATS requirements:
NAV — All aircraft need RNP type 12.6 approval
appropriate for the routes/tracks to be flown
COM — Voice communications through a third party
SUR — Procedural-pilot position reports
Other — System safety must be evaluated periodically.
Note.— Direct controller/pilot communications may
be desirable in certain areas, such as areas of known
convective weather.
Attachment B Annex 11 — Air Traffic Services
ATT B-3 12/81/111/0/012
No. 41
c) RNP 10
Spacing: 93 km (50 NM);
Basis: Collision risk model performed by the United
States Federal Aviation Administration for the Pacific
Region based on North Pacific traffic characteristics;
and
Minimum ATS requirements:
NAV — All aircraft need RNP type 10 approval
appropriate for the routes/tracks to be flown
COM — Voice communications through a third party
SUR — Procedural-pilot position reports
Other — System safety must be evaluated periodically.
Note.— Direct controller/pilot communications may
be desirable in certain areas, such as areas of known
convective weather.
d) RNP 5 (or RNP 4 or better)
Spacing: 30.6 km (16.5 NM) in a unidirectional system
33.3 km (18 NM) in a bi-directional system;
Basis: Comparison to a high-density continental
reference system (VOR spacing) as described in
Attachment A; and
Minimum ATS requirements:
NAV — All aircraft need RNP type 5 approval
appropriate for the routes/tracks to be flown, and the
NAVAID infrastructure must be provided sufficient to
support RNP 5 operations
COM — Direct VHF controller/pilot voice communications
SUR — Procedural-pilot position reports.
Note 1.— Guidance material relating to the use of
RNP 5 is contained in the Manual on Required
Navigation Performance (RNP) (Doc 9613).
Note 2.— This spacing was not developed for
applicability in remote and/or oceanic airspace where
an appropriate VOR infrastructure is not available.
e) RNP 4
Spacing: 55.5 km (30 NM);
Basis 1: Safety assessment performed by the United
States Federal Aviation Administration based on analysis
of acceptable rate of gross lateral errors in a parallel route
system using 55.5 km (30 NM) track spacing while
meeting a target level of safety of 5 × 10–9 fatal accidents
per flight hour.
Basis 2: Minimum requirements for communications
and surveillance listed below are operationally necessary
to manage contingency and emergency events in a
55.5 km (30 NM) route system.
Note.— Further information on the safety assessment
performed is contained in the Manual on Airspace Planning
Methodology for the Determination of Separation
Minima (Doc 9689).
Minimum ATS requirements:
NAV — RNP 4 shall be prescribed for the designated
area, tracks or ATS routes
COM — Direct controller-pilot voice communications
or controller-pilot data link communications (CPDLC)
SUR — An ADS system in which an event contract
must be set that includes a lateral deviation event report
whenever a deviation from track centre line greater than
9.3 km (5 NM) occurs.
Other — Prior to implementation, a system verification
of sufficient duration and integrity shall be performed to
demonstrate that the maximum acceptable rate of lateral
deviations greater than or equal to 27.8 km (15 NM) will
not exceed those listed in Table B-1 and that the system
meets operational and technical requirements. The verification
should be conducted after the minimum navigation,
communications and surveillance requirements
listed above have been met. Following implementation, a
monitoring programme must be established to periodically
verify that the system’s actual rate of lateral
deviations greater than or equal to 27.8 km (15 NM) does
not exceed the maximum prescribed in Table B-1
(information pertaining to monitoring can be found in the
Manual on Airspace Planning Methodology for the
Determination of Separation Minima (Doc 9689),
Chapter 8.
Note 1.— The airspace planner should first decide which of
the four system descriptions applies in the airspace under
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