Home' RTCA Documents for Review : DO-201B User Requirements for Navigation Data Contents ED-77A/DO-201BforOpenConsultation/FRAC
© EUROCAE, 2018
For example, the VOLKR ONE BRAVO ARRIVAL begins at the fix VOLKR. ONE is the
current edition and BRAVO is the routing indicator. ICAO also specifies that a coded
designator for the arrival be provided. The coded designator can consist of up to seven
characters. For example, the coded designator for the VOLKR ONE BRAVO ARRIVAL
would be (VOLKR1B). For names longer than 5 characters, see the ARINC 424
specification for rules to truncate the name.
Arrival and Approach Continuity
All existing and future arrivals should [NAV-D051] end at a point that is common to the
arrival and an expected approach procedure or procedures for the landing aerodrome.
The common point will permit an orderly transfer from the arrival to the approach.
All existing and future arrivals that begin at different fixes or navaids in the enroute
structure and cannot be tied to a common point or route segment by enroute transitions
should [NAV-D052] be designed as separate arrivals. These types of arrivals do not
provide a unique name or identifier for all possible tracks that can be used by navigation
database systems. Separate arrivals should [NAV-D053] be designed from VORs or a
common fix established in the area where enroute transitions can be used.
Requirements Unique to Departure Procedures
RNAV Departure Procedures
Note: When developing RNAV departure procedures, it may be necessary to establish
and publish, as a latitude and longitude co-ordinate, IRS ground update positions near
the take-off runway for some aircraft navigation systems. At least one of these identified
ground positions would be used by the flight crew to update the IRS to ensure a correct
navigation solution for the RNAV departure.
Departure Name and Coded Designator Standards
International standards for assigning departure names and coded designators are
included in ICAO Annex 11, Appendix 3. ICAO specifies that a departure name consist
of a basic indicator, a validity identifier, and when required, a route indicator. The basic
indicator is the name of the significant point where the departure ends such as navaid
or a fix. The validity identifier is a numeral from one to nine specifying the current edition
of the departure procedure. The route indicator is an alpha character added as a suffix
as necessary. For example, the MARIE ONE ALPHA DEPARTURE ends at the fix
MARIE. ONE is the current edition and ALPHA is the routing indicator. ICAO also
specifies that a coded designator for the departure be provided. The coded designator
can consist of up to seven characters. For example, the responsible authority coded
designator for the MARIE ONE ALPHA DEPARTURE would be (MARIE1A). For names
longer than 6 characters, see the ARINC 424 specification for rules to truncate the
Where enroute transitions are used to connect the departure to the enroute structure,
the transitions should [NAV-D054] begin at the common fix or navaid bearing the
departure name. Enroute transition naming is discussed in Section 126.96.36.199.
Commentary: Computer navigation systems require unique names for navigation
routes. When a departure is not named for the fix or navaid where the departure ends,
an artificial name will be created for the end-user causing potential confusion for the
All existing and future departures that end at different fixes or navaids in the enroute
structure should [NAV-D055] be designed as separate departures. Or, they could be
designed to a common fix in the terminal area, then tied to the enroute structure by
enroute transitions. Departures that do not provide a unique name or identifier for all
possible tracks cannot be used by a navigation database.
Links Archive Navigation Previous Page Next Page