ENR 1.9  Air traffic flow management and airspace management

1   General

1.1   Introduction
Air Traffic Flow Management (ATFM) is based on the ICAO concept for an integrated European Air Traffic Flow Management Service.In accordance with SES Regulations on ATM Network Functions. Performance scheme and the ATFM Implementing Rule, a Network Manager – NM, is assuming executive responsibilities of ATFM in Europe.
The Network Manager Operations Centre (NMOC) in Eurocontrol provides this service in conjunction with Flow Management Position (FMP) established at each ACC.
The overall authority for the provision of ATFM service in LJUBLJANA FIR is provided by the EUROCONTROL NM.
1.2   ATFM documentation
The general ATFM procedures, which apply throughout the ICAO European Region, are published in ICAO Doc. 7030/5 - Regional Supplementary Procedures (Europe) and EU Regulation 255/2010.
Detailed ATFM Procedures and information can be found in the Network Operations Handbook published by the NM and obtainable from:
Post:Eurocontrol Library
Rue de la Fusee 96
B-1130 Brussels
Phone:+ 32 2 7293 639
Fax:+ 32 2 7299 109

2   Responsibilities

2.1   Responsibilities of the NMOC
The NMOC is responsible for:
  • ensuring that traffic flows correspond to the stated capacity of the sectors through which they pass,
  • ensuring that, when necessary, ATFM measures are applied in an equitable manner and in such a way as to reduce as far as possible the penalties to Aircraft Operators.
In order to do this, the NMOC applies procedures which:
  • are agreed internationally,
  • are published in the corresponding NM documentation,
  • have, within LJUBLJANA FIR, the same status as procedures explicitly published in the AIP Slovenia.
2.2   Responsibilities of the Air Traffic Services (ATS)
ATS shall provide a Flow Management Position (FMP) in each ACC. A Flow Management Position within Ljubljana Air Traffic Control Centre is established to liaise between the air traffic control service, local AOs and the NMOC.
ATS Reporting Office ARO SLOVENIA is also responsible for information exchange with the NMOC for those AOs, who cannot communicate directly with the NMOC.
2.2.1   In LJUBLJANA FIR the following procedures shall be applied:
  • At international aerodromes the ATC unit (TWR) is responsible for departure slots monitoring;
  • Flights, which do not adhere to their slots shall be denied start up clearance by the controller. However, ATC shall make all efforts to enable departing flights to comply with the slot and flights shall not be prevented from departing due to small taxiing delays.
2.3   Responsibilities of Aircraft Operators (AOs)
Aircraft Operators shall inform themselves of and adhere to:
  • general ATFM procedures including flight plan (FPL) filing and message exchange requirements,
  • strategic ATFM measures (e.g. Route Availability Document – RAD),
  • current ATFM measures (e.g. specific measures applicable on the day in question).
Specifically they shall adhere to departure slots issued by the ATFM service.

3   Air traffic flow and capacity management procedures

In case of ATC capacity constraints in specific areas and/or at specific aerodromes Air Traffic Flow and Capacity Management is exercised.
Following measures, either individual or combined, may be applied:
NMOC, in cooperation with LJUBLJANA FMP, is responsible for the execution of ATFM measures within the LJUBLJANA FIR.
3.1   Slot allocation Procedure
The detailed procedures are laid down in the Network Operations Handbook.
The slot Allocation procedure will be applied in order to:
  • Prevent overload of Air Traffic Control
  • Make full use of available Air Traffic Control Capacity; facilitate the planning and operation of aircraft and staff of airspace users by early allocation CTOT/SLOTS.
  • Provide an economic flow of air traffic by reducing take-off delays and avoiding en-route holdings to the extent possible.
In order to achieve the objectives and operational advantages of the Slot Allocation Procedure listed above, the following regulations must be observed.
This applies particularly to timely filing/transmission of flight plans, changes thereto or cancellation, and adherence to the assigned Calculated Take Off Time (CTOT).
  • For all operators, which do not receive ATFM Messages directly from NMOC information on existing ATFM measures may be obtained from ARO SLOVENIA.
  • Where repetitive flight plans do not exist, for flights subject to ATFM measures flight plans shall be submitted at least 3 hours before the Estimated Off Block Time (EOBT). Aircraft Operators submitting the flight plan less than 3 hours prior EOBT may risk excessive delay.
3.2   Allocation of CTOTs
For flights subject to ATFM measures a departure slot containing the Calculated Take Off Time (CTOT), will be automatically allocated by NMOC based on the EOBT and transmitted 2 hours before EOBT to the aircraft operator. If practicable or required, a departure Slot will also be relayed to ATS, provided the RPL or FPL concerned has been acknowledged by IFPS.
At a fixed time before the Estimated Off-Block Time (EOBT) of each pre-allocated flight (subjected to ATFM measures), called Slot Issue Time 1 (SIT1 = EOBT- 2 Hours); the slot is allocated to the flight and a Slot Allocation Message (SAM) is sent to the AOs and ATC.
A slot is issued as a Calculated Take-Off Time (CTOT). The CTOT is defined as a time when the aircraft must take-off.
The slot tolerance (-5’ to + 10’) is available only to ATC and only to organise the departure sequence. The average taxi time is included in the CTOT.
The CTOT is included in a slot allocation message (SAM), which is sent by the NMOC to:
  1. The address notified in advance to the NMOC by the aircraft operator, or
  2. When the address is not known to NMOC:
    • The flight plan originator
3.3   Slot monitoring and Slot Adherence
The allocation of ATFM departure slots shall give priority to flights according to the order of their planned entry into the location at which the ATFM measure will apply, unless specific circumstances require application of a different priority rule which is formally agreed and is of benefit to the EATMN.
ATC TWRs will, as far as practicable, depart aircraft within their assigned departure slot. To allow the ATC TWR to carry out this task aircraft operators shall request start-up and push-back in time to possibly be at holding point of the RWY in use at CTOT allocated to the flight.
Non-compliance with this rule might lead to considerable delay.
To flights for which a Flight Suspension Message (FLS) has been received, no start-up clearance will be issued until a Slot Allocation Message (SAM), or a De-suspension Message (DES) has been received for the flight concerned. Aircraft operators which have received a FLS message are strongly advised in their own interest to react with a Flight Confirmation Message (FCM) to NMOC, if required.
3.4   Route Availability Document (RAD)
The RAD is available on the internet at: https://www.nm.eurocontrol.int/RAD/index.html
Flight planning procedures and restrictions are published in ENR 1.10

4   ATFM exemption procedures

The objective of this procedure is to describe the process to be followed in order to grant an Air Traffic Flow Management (ATFM) departure slot exemption. It shall be applied to all flights in accordance with instrument flight rules (IFR) in whole or in part departing from territory of the Republic of Slovenia by all Aircraft Operators.
The general procedures are in accordance with EU Regulation 255/2010 and applicable national regulation.
4.1   Special status flights
Within the framework of air traffic management, flights for which an IFR flight plan is filed may be subject to ATFM measures and imposed departure slot. Due to their specific nature and when duly filled-out in field 18 of the ICAO flight plan, those flights are granted automatic exemption from any AFTM measures.
The following flights treated with “special handling” concerning ATFM Measures:
  1. STS/HEAD Head of State or equivalent status
  2. STS/SAR Search and Rescue operation
  3. STS/MEDEVAC Medical emergency evacuation (life critical
  4. STS/FFR Fire-fighting operation
  5. STS/ATFMX State business, Humanitarian or Medical
  6. STS/ATFMX RMK/VACCINE Critical flights carrying C-19 Vaccines
These principles are based on the relevant chapter on ATFCM slot allocation in ATFCM User’s Manual as established by ICAO in the Doc. 7030.
4.2   Monitoring of ATFM Exemption
Other specific flights than those mentioned in previous paragraph may also justify an ATFM departure slot exemption. In field 18 of the ICAO flight plan the STS/ATFMX indicator has been created for this purpose. Therefore its use is subject to specific rules and conditions as described in Article 4.3 - Eligible Flights for the ATFM Exemption and shall be authorized by ANSP Unit - ATS Reporting Office ARO SLOVENIA.
4.3   Eligible Flights for the ATFM Exemption
Aircraft operator shall request an ATFM exemption in the following cases:
  1. All flights mentioned on in Article (4.1) Special status flights of this procedure.
  2. Criteria for determining of STS/ATFMX
    The indicators STS/HOSP or STS/HUM: A human life may be lost or the physical integrity of a person seriously compromised in permanent manner in the event of a delay due to an ATFM control measures. Such situations may include patients with threat of loss of limbs, urgent transport of organs or medical teams and humanitarian flights. These flights may provide specific medical/UNCHR authorization to support their request. Pre-positioning flights may also be granted exemption if the situation so requires.
    The indicator STS/STATE: The flight is for state mission of such importance that any delay of flight is not acceptable. RMK/VACCINE: A critical flight due to COVID-19 vaccine transport.
An ATFM exemption shall be granted to flights referred to in Paragraph (B) of this Article, when combined with the designator STS/ATFMX and when duly filled-out in the field 18 of ICAO flight plan.
4.4   Procedures for requesting an ATFM Exemption for the use of STS/ATFMX
Aircraft operators, who request an ATFM exemption to insert the indicator STS/ATFMX, shall obtain authorisation before the flight by transmitting the information required to: exemptions@sloveniacontrol.si.
Required information:
  • Call-sign/aircraft registration and Operator of the flight
  • Contact phone number and e-mail
  • Date of Flight and Estimated time of departure (ETD)
  • Departure and Arrival airport
  • Reason for application
  • Type of exemption:

The request shall be made at least 24 hours before flight. ARO will respond to source e-mail of applicant’s request. The absence of response within 20 hours grants authorisation. Applicants (Operators or their agents/representatives) shall keep any documents (i.e. medical/UNCHR authorisations or similar) that support justification for granting the exemptions for at least two years.
4.5   Compliance Monitoring
The Network Manager (NM) provides the ANSP Slovenia Control with a monthly list of all flights departed from territory of Slovenia that have used an ATFM exemption.ARO SLOVENIA maintains a database of all flights that have received an ATFM exemption approval. Applications with approvals shall be kept in archive for at least two years. The CAA undertakes to verify that all such flights operated with an appropriate approval for ATFM exemption.
4.6   Inappropriate use of the ATFM designation
The decision to use a particular status indicator is the responsibility of the aircraft operator. Unauthorised use of any of these indicators with the intention of avoiding ATFM measures is considered as a serious breach of procedure and shall be dealt with accordingly.
It should be noted that any flight that would have normally been delayed and that obtains an ATFM departure slot exemption transfers the delay to other flights. It is essential that the ATFM exemption shall only be used if the situation justifies it. Any abusive use by an Operator or its agent/representative may be subject to an infringement procedure or heavy fine.

5   Operational data

5.1   Addresses
Directorate NM
Rue de la Fusee 96
B-1130 Brussels
Phone:+32 2 729 9011
Fax:+32 2 729 9043
IFPU1 – Brussels
Phone:+32 2 745 1950
Fax:+32 2 729 9041
IFPU2 – Bretigny
Phone:+33 1 6988 1750
Fax:+33 1 6988 3822
Help Desk
Phone:+32 2 729 1901
Fax:+32 2 729 9027
FMP LjubljanaPost:Slovenia Control, Ltd.
Zgornji Brnik 130n
SI-4210 Brnik-aerodrom
Phone:+386 4 2040 110 (H24)
Fax:+386 4 2040 098 (H24)

Hours of Operation is H24
ARO SLOVENIAPhone:+386 4 2040 420 (H24)
Fax:+386 4 2023 851 (H24)