FAQ

  • Cancel-DPI

    What is the trigger for Cancel DPI?

    A C-DPI will be sent after TOBT deletion plus 2 min. This is intended to give you the chance to enter a new TOBT without Eurocontrol issuing a flight suspension in the meantime.

  • CDM Alerts

    Can I define the CDM alerts I want to receive (e.g. only the CDM alerts that can cause a C-DPI message)?

    This depends on the local implementation. Please contact the local ACDM representative.

    Is it possible to receive CDM Alerts via e-mail or SITA?

    CDM alerts can be received via e-mail, via SITA they are not available. Aside from that, they are also displayed within the local ACDM CSA tools.

    Please contact the local ACDM homepages or representative for further information.

  • CDM-Portal

    Is it possible to access your local CDM Portal via internet? Do we need a password?

    This depends on the local implementation. Please contact the local ACDM representative.

  • Contact

    Do you have a phone number to the local ATC CDM position in the tower?

    Please refer to the local information, e.g. AIP chapter AD2.20 or the airport’s Brief Description.

    In case of urgent CDM related problems on day of operation, who can we contact (besides our handling agent)?

    Please refer to the local information, e.g. AIP chapter AD2.20 or the airport’s Brief Description.

    In case we need to investigate a CDM issue (post operationally), who do we contact?

    All requests for investigation will be answered. Please refer to the local information, e.g. AIP chapter AD2.20 or the airport’s Brief Description.

    In addition, all requests should be copied to the responsible persons for the German ACDM Harmonization Initiative (A-CDM@GER).

  • EOBT and TOBT

    Are there limits for EOBT/TOBT discrepancy? E.g. do we have to update the EOBT according to TOBT when discrepancy is 10 minutes or more, or 15 minutes or more?

    Generally, EOBT and TOBT should be aligned as closely as possible. Alert CDM08 (EOBT Compliance Alert) is generated when EOBT differs by more than 15 minutes from the TOBT.

    In individual cases it might be desired to put the TOBT ahead of the EOBT. In these cases we accept only a 10-minute difference. ICAO states that any EOBT change greater 15 min must be announced. In case of TOBT before EOBT, ACDM in Germany also considers TSAT. If TSAT and TOBT are equal, this would allow the pilot to request start-up at five minutes prior TSAT, which in that case equals 15 min prior EOBT.

    How often can a TOBT be updated?

    TOBT can be updated as often as you wish until TSAT issue. After TSAT issue a TOBT may be updated a maximum of three times. If a fourth update of TOBT is required, please delete the previous TOBT first. This will reset the internal counter, giving you three more TOBT inputs.

    Please keep in mind that TOBT is used for planning purposes by many partners, among them the flow controllers at Eurocontrol. Therefore, please try to provide a reliable and stable TOBT. We do understand, however, that in individual cases it might become necessary to update the TOBT several times or late in the process.

    Is it possible to update TOBT by updating EOBT in the FPL (sending a DLA message to the FPL)?

    Generally, EOBT and TOBT are separate values. Based on our experience, the quality of locally available information and, therefore, TOBT is higher than that of EOBT. TOBT may only be updated by the local person responsible for TOBT to ensure integrity of the information.

    Remark: Upon request, NMOC now provides the possibility to generate automatic DLA messages if updated TOBTs are received via DPI messages. Please contact the local ACDM representative.

    Will you refuse a flight to depart if initially filed FPL does not match airport slot?

    In case EOBT and SOBT differ, an alert CDM02 (SOBT vs. EOBT discrepancy) will be sent. Departure of that flight will not be refused automatically.

  • Flight Crew – Request

    When is the flight crew expected to request Start-Up? 

    Start-Up via R/T shall be requested according to TSAT (tolerance window TSAT -/+ 5 minutes). Datalink requests may be sent earlier. Within the response message, the flight crew will find the following information: “Start-Up approved at TSAT HH:MM”