The European Organisation for the Safety of Air Navigation

ARINC 424A specification and SESAR WP9.31

AIXM Procedure Modelling/Encoding seminarBrussels – 01/02 Sept 2010

Hubert LEPORIEurocontrol AIM Unit

ARINC 424A specification and SESAR WP9.31 2

Arinc424 specification

• 70’s: development of the first Flight Management Systems (FMS)

• Need for more an more complex embedded navigation databases to support evolving navigation techniques…

Navigation data

Arinc424

AIP

AIP

ARINC 424A specification and SESAR WP9.31 3

Arinc424 specification

• Arinc424: “Navigation System Data Base”

• sets forth the air transport industry’s recommended standards for the preparation of airborne navigation system reference data files.

• Version 1 published in May 1975

• Version 19 published in December 2008 – applicable today

• Arinc424 committee

• 1 regular meeting per year to discuss on A424 change proposals

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Arinc424 specification

• The Arinc424 specifies a format of navigation (and communication) data.• Plain text - lines of 132 alphanumeric characters• Navigation data: Airports, Runways, Navaids, Procedures• Communication data: Com Services (ATIS…)

• The Arinc424 scope is not restricted to FMS data – it also includes data for Flight Planning systems, Simulation tools…

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Arinc424 specification

SEURP EBBREB BRU[………….]BRUSSELS ZAVENTEM 000000310

A424-A Section 4 A424-A Section 5

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Arinc424 specification

• A424 P/T are referenced in ICAO Performance-Based Navigation Manual

ARINC 424A specification and SESAR WP9.31 7

ANSPs

AIP

…

Data providers

…

The current A424 data chain

FMS suppliers

AIP

A42

4

$$

$$

ARINC 424A specification and SESAR WP9.31 8

NDBX concept / Arinc424-A

• Since 2006, a technical group formed inside AEEC has been studying the feasibility to define and standardize an open source format for embedded navigation databases => NDBX• based on the content of Arinc424 v.19 but restricted to FMS

perimeter• relying on a new UML model and on XML & Binary XML

representation of the data

• In 2008, the decision was taken by the AEEC to merge the existing Arinc424 specification and the NDBX standard => Arinc424-A

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Arinc424-A : the big picture

ARINC424-19NDBX

(Embedded format Requirements)

Input for the definition of ARINC424-A content

ARINC424-A formats Script 1Visual Basic

“Bijection” between original A414-19 and Arinc424-A ASCII

ARINC 424AASCII

(Legacy Format)

ARINC424ABXML

(embedded XML)

Full ARINC424AXML

Script 2TBD

ARINC424-A Model UML

Adapted ARINC424

XML ?

ARINC 424A

ARINC 424A specification and SESAR WP9.31 10

ANSPs

AIP

…

Data providers

…

The future A424A-NDBX data chain (?)

New generation of Avionic Systems

AIP

A42

4A B

-XM

L

$$

ARINC 424A specification and SESAR WP9.31 11

Eurocontrol’s involvement in Arinc424A

• 2006-2007: Eurocontrol participated in the initial NDBX committee and shared AIXM experience with the group

• 2007-2009: A Business Rules Working Group was formed inside the NDBX Committee, led by Eurocontrol and tasked with the development of an initial set of validation rules.

• 2010-2012: Eurocontrol continues to support the development of the A424A specification through its contribution to SESAR project 9.31.

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SESAR WP9.31 “Aeronautical Databases”

• Scope of WP 9.31 • Structure and content of Navigation, Airport, Terrain &

Obstacle DB• Evolutions of the database production chain (focus on data

integrity, performance…)

• WP9.31 includes some interaction with the ARINC424A standardisation group for the integration of new navigation database requirements

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SESAR WP9.31 “Aeronautical Databases”

• 2010: Produce business rules for Arinc424-A, following the methodology used for the AIXM 5.1 business rules

• 2010-2012:

ARINC 424A UML/XML/BXML

FMSSimulation

Define a set of mapping rules for conversion of ground sources (AIXM 5.1) into Arinc424A data (2011)

- Regulatory framework- Identify the most effective means to ensure data integrity- Recommendations for DB packing, verification, certification

Definition of Global Database Management Process

Practically – validation of NavDB chain

End User validation

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Questions ?