+-------------------------------+--------------------------------------+
| **THE TWENTY-NINETH MEETING   |                                      |
| OF THE**                      |                                      |
|                               |                                      |
| **INFORMAL PACIFIC atc        |                                      |
| CO-ORDINATING GROUP**         |                                      |
|                               |                                      |
| **(ipacg/29)**                |                                      |
+-------------------------------+--------------------------------------+
| (Fukuoka, Japan, 29 -- 31     |                                      |
| October 2008)                 |                                      |
+-------------------------------+--------------------------------------+
| Agenda Item 2:                | Report on Relevant Outcomes from     |
|                               | Other Meetings                       |
+-------------------------------+--------------------------------------+
| **REport on the second        |                                      |
| meeting of icao tran-regional |                                      |
| airspace and supporting atm   |                                      |
| system steering group         |                                      |
| (trasas/2)**                  |                                      |
+-------------------------------+--------------------------------------+
| (Presented by the             |                                      |
| International Civil Aviation  |                                      |
| Organization)                 |                                      |
+-------------------------------+--------------------------------------+
| **SUMMARY**                   |                                      |
+-------------------------------+--------------------------------------+
| ICAO Trans-Regional Airspace  |                                      |
| and Supporting ATM Systems    |                                      |
| Steering Group (TRASAS) was   |                                      |
| established to continue work  |                                      |
| concerning the traffic flows  |                                      |
| between Asia, Europe and      |                                      |
| North America, and to respond |                                      |
| to the new requirements for   |                                      |
| increased efficiency and      |                                      |
| further developments. This    |                                      |
| paper reports the outcomes    |                                      |
| the second meeting of the     |                                      |
| TRASAS (TRASAS/2, March       |                                      |
| 2008), and the review of the  |                                      |
| outcomes by the 18^th^        |                                      |
| meeting of ICAO ATM/AIS/SAR   |                                      |
| Sub-group (ATM/AIS/SAR/SG/18, |                                      |
| June 2008) and the 19^th^     |                                      |
| meeting of ICAO Asia/Pacific  |                                      |
| Air Navigation Planning and   |                                      |
| Implementation Regional Group |                                      |
| (APANPIRG/19, September       |                                      |
| 2007).                        |                                      |
+-------------------------------+--------------------------------------+

# INTRODUCTION

1.  ICAO Trans-Regional Airspace and Supporting ATM Systems Steering
    Group (TRASAS), supported by the North Atlantic System Planning
    Group (NAT SPG) and Europe Air Navigation Planning Group (EANPG),
    was established to continue work concerning the traffic flows
    between Asia, Europe and North America, and to respond to the new
    requirements for increasing efficiency and further developments.
    TRASAS will co-ordinate the requirements of international civil
    aviation for a coherent and economically viable and operationally
    optimal structure of ATS routes, linking city-pairs in Europe and
    Asia, Europe and North America, and Asia and North America.

# discussion

1.  The second meeting of the TRASAS (TRASAS/2) was held at ICAO Asia
    and Pacific Office, Bangkok, Thailand, on 18 and 19 March 2008.

[Report on Significant International Aviation Development]{.underline}

2.  TRASAS/2 noted the activities of the following forums: Planning and
    Implementation Regional Groups (PIRGs) including NAT SPG Special
    2007 and GREPECAS/14; the first meeting of Asia/Pacific Performance
    Based Navigation Task Force (PBN/TF); the 32^nd^ meeting of the RVSM
    Implementation Task Force regarding the implementation of RVSM in
    Chinese airspace; the fifth Special ATS Coordination Meeting --
    China, Mongolia, Russian Federation and IATA (CMRI/5); and the
    fourth meeting of the Cross-Polar Trans-east Air Traffic Management
    Working Group (CPWG/4).

[Short, Medium and Long Term Goals of TRASAS]{.underline}

3.  TRASAS/2 noted the progress on Data Link Harmonization activities in
    Europe and the North Atlantic (EUR/NAT) Regions, and agreed to
    invite the 19^th^ meeting of APANPIRG (September 2008, Bangkok) to
    consider a draft Conclusion as follows:

> ***Draft Conclusion TRASAS/2 - 1** **-- Data Link Harmonization
> Strategy***
>
> *That the APANPIRG be invited to consider amending the Strategy for
> Implementation of the Air-Ground Data Link in the Asia/Pacific Region
> to include the Data Link Harmonization Strategy endorsed by EANPG and
> NATSPG.*

4.  APANPIRG/19 considered the Draft Conclusion TRASAS/2 - 1. However,
    in light of subsequent developments advised to the 18^th^ meeting of
    the ATM/AIS/SAR Sub-group (ATM/AIS/SAR/SG/18, June 2008),
    APANPIRG/19 considered that it was premature to endorse the draft
    Conclusion above but agreed that APANPIRG promulgate clear
    'in-principle' support for global data link harmonization in terms
    of the following text:

> *That, noting the developmental work being coordinated by the ICAO
> Secretariat in terms of a global harmonization strategy for ADS-C and
> CPDLC data link operations, APANPIRG fully supports the principle of
> global converge of data link evolutions to properly support seamless
> ATS provision across global FIR boundaries. In this context, APANPIRG
> gives in-principle support to the draft Data Link Harmonization
> Strategy shown at Appendix G* (**Attachment** to this paper) *to the
> APANPIRG/19 Report on Agenda Item 3.2, recognizing that amendment to
> the draft strategy is likely under the guidance of the OPLINK Panel.*

5.  TRASAS/2 considered RNP Implementation Plans for Cross-Polar and
    Trans-East Operations, and agreed on the following Conclusion:

> ***TRASAS Conclusion 2/2** -- **RNP for Cross-Polar and Trans-East
> Operations***
>
> *That all PIRGs concerned be invited to consider actions that will
> harmonize the application of separation standards and a means to
> achieve:*
>
> *a) implementation of the RNP 10 provisions in the airspaces covering
> the Cross-Polar and Trans-East routes/operations as a
> short-term/medium-term action;*
>
> *b) implementation of the RNP 4 provisions in the same airspaces as
> described above, as a medium-term/long-term improvement; and*
>
> *c) amend, as appropriate, the provisions of Regional Supplementary
> Procedures and the Regional Air Navigation Plans.*

6.  ATM/AIS/SAR/SG/18 considered that these initiatives fitted well with
    the Performance Based Navigation (PBN) Implementation Plans that
    were being prepared by the PBN/TF and requested that the Secretariat
    make the PBN/TF aware of this recommendation from TRASAS in order
    that it could be properly considered as part of the Regional PBN
    Implementation Plan.

7.  TRASAS/2 reviewed and agreed on changes to the TRASAS Action List.
    In respect of TRASAS Action 1/6 - *Ensure improved surveillance and
    communications in the Northern Airspace*, TRASAS agreed on **TRASAS
    Conclusion 2/3 -- Improved Surveillance and Communications in the
    Northern Airspace**.

8.  Under Any Other Business, IATA brought the attention of the Group to
    a portion of airspace of unassigned responsibility, extending from
    the North Pole over the high seas between the Bodo Oceanic,
    Sondrestrom and Murmansk Oceanic flight information regions (FIRs).
    Considering the increased interest of establishing new ATS routes
    through that airspace, TRASAS/2 agreed on **TRASAS Conclusion 2/4 --
    Airspace of Unassigned Responsibility over the Arctic Ocean**.

9.  The next meeting of TRASAS is tentatively scheduled at the ICAO
    Regional Office in Mexico City, from 17 -- 18 March, 2009.

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1.  **ACTION BY THE MEETING**

3.1 The meeting is invited to:

a)  note the information in this paper;

b)  note that APANPIRG agreed to promulgate clear 'in-principle' support
    for global data link harmonization; and

c)  consider RNP Implementation Plans for Cross-Polar and Trans-East
    Operations.

      

**FINAL DRAFT**

**Data Link Harmonization Strategy --- ADS-C and CPDLC**

-   Any additional aircraft implementation of automatic dependent
    surveillance --- contract (ADS-C) should either;

i)  utilise without change the existing DO-258A/ED-100A[^1] (FANS-1/A)
    ADS-C, or

ii) move to the full implementation of the internationally agreed common
    technical definition that will be defined based on relevant
    provisions and guidance material (*Manual of Air Traffic Services
    Data Link Applications* (Doc 9694)) developed by ICAO and its
    technical bodies

    Partial or divergent aircraft data link evolutions should not be
    pursued, as they will continue to promote divergent paths to the
    detriment to the broader community. Interim steps or phases toward
    full implementation of the common technical definition in ground
    systems should only be pursued on a regional basis, after
    coordination between all States concerned.

-   Any additional aircraft implementation of controller-pilot data link
    communications (CPDLC) should either;

i)  utilise without change the existing DO-258A/ED-100A (FANS-1/A) or
    DO-280B/ED-110B[^2] (ATN) CPDLC for ACM/ACL/AMC[^3] data link
    services, or

ii) move to the full implementation of the internationally agreed common
    technical definition, based on *Procedures for Air Navigation
    Services --- Air Traffic Management* (PANS-ATM, Doc 4444), and other
    operational material as appropriate

    Partial or divergent aircraft data link evolutions that result in
    excluding messages from aircraft systems should not be pursued, as
    they will continue to promote divergent paths to the detriment to
    the broader community. Interim steps or phases toward full
    implementation of the common technical definition in ground systems
    should only be pursued on a regional basis, after coordination
    between all States concerned.

-   Harmonization of operational procedures for implementation of the
    above packages is considered essential. States, planning and
    implementation regional groups (PIRGs), ANS providers and other ATS
    coordinating groups should adopt common procedures to support
    seamless ATS provision across flight information region (FIR)
    boundaries, rather than each State or Region developing and
    promulgating unique procedures for common functions.

    

[^1]: *RTCA/EUROCAE Interoperability Requirements for ATS Applications
    Using ARINC 622 Data Communications*

    *(FANS 1/A INTEROP Standard)*

[^2]: *RTCA/EUROCAE Interoperability Requirements Standard For ATN
    Baseline 1 (ATN B1 INTEROP Standard)*

[^3]: *Air traffic control communications management/Air traffic control
    clearances and information/Air traffic control microphone check*