Commission Regulation (EU) No 1332/2011 of 16 December 2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance)
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Address https://gelex.eu/eli/EU/regulation/2011/1332@2011-12-16/en
THE EUROPEAN COMMISSION,
Having regard to the Treaty on the Functioning of the European Union,
Having regard to Regulation (EC) No 216/2008 of the European Parliament and of the Council of 20 February 2008 on common rules in the field of civil aviation and establishing a European Aviation Safety Agency, and repealing Council Directive 91/670/EEC, Regulation (EC) No 1592/2002 and Directive 2004/36/EC, and in particular Articles 8(1), 8(5), and 9(4) thereof,
Whereas:
(1) Safety requirements should be imposed on operators of aircraft registered in a Member State or registered in a third country and operated by a Union operator, and on operators of aircraft used by a third country operator within the Union.
(2) Following a series of mid-air encounters in which safety margins have been lost, including accidents in Yaizu (Japan) in 2001 and in Überlingen (Germany) in 2002, the current airborne collision avoidance system software should be upgraded. The studies concluded that with the current airborne collision avoidance system software there is a probability of a mid-air collision risk of 2,7 × 10–8 per flight hour. Therefore the current ACAS II version 7.0 is considered to be of an unacceptable safety risk.
(3) It is necessary to introduce a new software version of the airborne collision avoidance system (ACAS II) to avoid mid-air collision of all aircraft flying in the airspace covered by Regulation (EC) No 216/2008.
(4) To ensure the highest possible safety standards, aircraft which do not fall within the scope of the mandatory carriage requirement but were equipped with ACAS II prior to entry into force of this Regulation should install ACAS II containing the latest version of collision avoidance software.
(5) In order to ensure that the safety benefits associated with the new software version are achieved, all aircraft need to be equipped as soon as practically possible. However, it is necessary to provide a realistic time for the aeronautical industry to adapt to this new Regulation taking into account the availability of new equipment.
(6) The Agency prepared draft implementing rules and submitted them as an opinion to the Commission in accordance with Article 19(1) of Regulation (EC) No 216/2008.
(7) The measures provided for in this Regulation are in accordance with the opinion of the European Aviation Safety Agency Committee established by Article 65 of Regulation (EC) No 216/2008,
HAS ADOPTED THIS REGULATION:
Article 1 Subject matter and scope
This Regulation lays down common airspace usage requirements and operating procedures for airborne collision avoidance to be fulfilled by:
(a) operators of aircraft referred to under Article 4(1)(b) and (c) of Regulation (EC) No 216/2008 undertaking flights into, within or out of the Union; and
(b) operators of aircraft referred to under Article 4(1)(d) of Regulation (EC) No 216/2008 undertaking flights within the airspace above the territory to which the Treaty applies as well as in any other airspace where Member States apply Regulation (EC) No 551/2004 of the European Parliament and of the Council.
Article 2 Definitions
For the purposes of this Regulation the following definitions shall apply:
(1) airborne collision avoidance system (ACAS) means an aircraft system based on secondary surveillance radar (SSR) transponder signals which operates independently of ground-based equipment to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders;
(2) airborne collision avoidance system II (ACAS II) means an airborne collision avoidance system which provides vertical resolution advisories in addition to traffic advisories;
(3) resolution advisory (RA) indication means an indication given to the flight crew recommending a manoeuvre intended to provide separation from all threats or a manoeuvre restriction intended to maintain existing separation;
(4) traffic advisory (TA) indication means an indication given to the flight crew that the proximity of another aircraft is a potential threat.
Article 3 Airborne collision avoidance system (ACAS)
1. The aeroplanes referred to in Section I of the Annex to this Regulation shall be equipped with and operated in accordance with the rules and procedures as specified in the Annex.
2. Member States shall ensure that operation of aeroplanes referred to in Article 1(2)(a) of Regulation (EC) No 216/2008 comply with the rules and procedures specified in the Annex in accordance with the conditions set out in that Article.
Article 4 Special provisions applying to operators subject to Council Regulation (EEC) No 3922/91
1. By derogation from provisions OPS 1.668 and OPS 1.398 of Annex III to Regulation (EEC) No 3922/91, Article 3 and the Annex to this Regulation shall apply for operators of aeroplanes referred to in Article 1(a).
2. Any other obligation imposed on air operators by Regulation (EEC) No 3922/91 as regards the approval, installation or operation of equipment shall continue to apply to ACAS II.
Article 5 Entry into force and application
1. This Regulation shall enter into force on the 20th day following its publication in the Official Journal of the European Union.
2. Articles 3 and 4 shall apply as of 1 March 2012.
3. By way of derogation from paragraph 2, in the case of aircraft with an individual certificate of airworthiness issued before 1 March 2012, the provisions of Article 3 and 4 shall apply as of 1 December 2015.
This Regulation shall be binding in its entirety and directly applicable in all Member States. Done at Brussels, 16 December 2011. For the Commission The President José Manuel Barroso
ANNEX
ANNEX Airborne collision avoidance systems (ACAS) II (Part-ACAS)
Section I
ACAS II equipment
AUR.ACAS.1005(1)(2)(3) Performance requirement The following turbine-powered aeroplanes shall be equipped with collision avoidance logic version 7.1 of ACAS II: Aircraft not referred to in point (1) but which will be equipped on a voluntary basis with ACAS II, shall have collision avoidance logic version 7.1. Point (1) shall not apply to unmanned aircraft systems.
(a) aeroplanes with a maximum certificated take-off mass exceeding 5700 kg; or
(b) aeroplanes authorised to carry more than 19 passengers.
Section II
Operations
AUR.ACAS.2005(1)(2) Use of ACAS II ACAS II shall be used during flight, except as provided in the minimum equipment list as specified in Annex III to Regulation (EEC) No 3922/91, in a mode that enables RA indications to be produced for the flight crew when undue proximity to another aircraft is detected, unless inhibition of RA indication mode (using TA indication only or equivalent) is called for by an abnormal procedure or due to performance limiting conditions. When an RA indication is produced by ACAS II:
(a) the pilot flying shall immediately conform to the indications of the RA indication, even if this conflicts with an air traffic control (ATC) instruction, unless doing so would jeopardise the safety of the aircraft;
(b) the flight crew, as soon as permitted by workload, shall notify the appropriate ATC unit of any RA which requires a deviation from the current ATC instruction or clearance;
(c) when the conflict is resolved, the aircraft shall:
(i) be promptly returned to the terms of the acknowledged ATC instruction or clearance and ATC notified of the manoeuvre; or
(ii) comply with any amended ATC clearance or instruction issued.
AUR.ACAS.2010 ACAS II training Operators shall establish ACAS II operational procedures and training programmes so that the flight crew is appropriately trained in the avoidance of collisions and competent in the use of ACAS II equipment.
Versions
Cited by
- Corrigendum to Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Official Journal of the European Union L, 2025/343, 18 February 2025) Corrigendum · Grade B
On page 2, in Article 1, in the amendment to point AUR.ACAS.1005 of the Annex to Regulation (EU) No 1332/2011 for: AUR.ACAS.1005 Performance requirement The following turbine-powered aeroplanes shall be equipped with ACAS II with a collision avoidance logic version 7.1 or with ACAS Xa: Aircraft not referred to in point 1 but which are equipped on a voluntary basis with ACAS II, shall have collision avoidance logic version 7.1 or ACAS Xa. Point 1 shall not apply to unmanned aircraft systems. read: AUR.ACAS.1005 Performance requirement
- Council Decision (EU) 2025/2624 of 15 December 2025 amending Decision (EU) 2023/746 as regards the extension of the period of its application and as regards its Annex Decision · Grade B
At Union level, the requirements contained in SARPs for air navigation and air traffic management are mainly reflected and referred to in Regulations (EC) No 549/2004, (EC) No 550/2004 and (EU) 2024/2803 of the European Parliament and of the Council and in the implementing and delegated acts adopted on the basis thereof, in particular Commission Regulation (EU) No 1332/2011, Commission Implementing Regulation (EU) No 923/2012, Commission Regulation (EU) 2015/340 and Commission Implementing Regulation (EU) 2018/1048.
- Commission Regulation (EU) No 379/2014 of 7 April 2014 amending Commission Regulation (EU) No 965/2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council Regulation · Grade B
Airborne collision avoidance system (ACAS) The operator shall establish operational procedures and training programmes when ACAS is installed and serviceable. When ACAS II is used, such procedures and training shall be in accordance with Regulation (EU) No 1332/2011. The ACAS II may be disabled during those specialised tasks, which by their nature require the aircraft to be operated within a distance from each other below that which would trigger the ACAS.
- Commission Regulation (EU) No 379/2014 of 7 April 2014 amending Commission Regulation (EU) No 965/2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council Regulation · Grade B
Airborne collision avoidance system (ACAS II) Unless otherwise provided for by Regulation (EU) No 1332/2011, turbine-powered aeroplanes with an MCTOM of more than 5700 kg shall be equipped with ACAS II.
- Commission Regulation (EU) No 800/2013 of 14 August 2013 amending Regulation (EU) No 965/2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council (Text with EEA relevance) Regulation · Grade B
Airborne collision avoidance system (ACAS) The operator shall establish operational procedures and training programs when ACAS is installed and serviceable. When ACAS II is used, such procedures and training shall be in accordance with Regulation (EU) No 1332/2011.
- Commission Regulation (EU) No 800/2013 of 14 August 2013 amending Regulation (EU) No 965/2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council (Text with EEA relevance) Regulation · Grade B
Airborne collision avoidance system (ACAS) Unless otherwise provided for by Regulation (EU) No 1332/2011, turbine-powered aeroplanes with an MCTOM of more than 5700 kg or an MOPSC of more than 19 shall be equipped with ACAS II.
- Commission Regulation (EU) No 800/2013 of 14 August 2013 amending Regulation (EU) No 965/2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council (Text with EEA relevance) Regulation · Grade B
Airborne collision avoidance system (ACAS II) When ACAS II is used, operational procedures and training shall be in accordance with Regulation (EU) No 1332/2011.
- Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council Regulation · Grade B
Use of airborne collision avoidance system (ACAS) The operator shall establish operational procedures and training programmes when ACAS is installed and serviceable. When ACAS II is used, such procedures and training shall be in accordance with Commission Regulation (EU) No 1332/2011.
- Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council Regulation · Grade B
Airborne collision avoidance system (ACAS) Unless otherwise provided for by Regulation (EU) No 1332/2011, turbine-powered aeroplanes with an MCTOM of more than 5700 kg or an MOPSC of more than 19 shall be equipped with ACAS II.
- Council Decision (EU) 2023/746 of 28 March 2023 establishing the criteria and the procedure for establishing the position to be taken on the European Union’s behalf within the International Civil Aviation Organization as regards the adoption of, or amendments to, international standards and recommended practices, and the notification of differences with respect to adopted international standards Decision · Grade B
At Union level, the requirements contained in SARPs for air navigation and air traffic management are mainly reflected and referred to in Regulations (EC) No 549/2004, (EC) No 550/2004, (EC) No 551/2004 of the European Parliament and of the Council and in the implementing and delegated acts adopted on the basis thereof in particular Commission Implementing Regulation (EU) No 923/2012, Commission Regulation (EU) No 1332/2011, Commission Implementing Regulation (EU) 2018/1048, and Commission Regulation (EU) 2015/340.
- Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Text with EEA relevance) Regulation · Grade B
Commission Regulation (EU) No 1332/2011 lays down common airspace usage requirements and operating procedures for airborne collision avoidance.
- Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Text with EEA relevance) Regulation · Grade B
Regulation (EU) No 1332/2011 requires turbine-powered aeroplanes, with a maximum certificated take-off mass of more than 5700 kg or authorised to carry more than 19 passengers to be equipped with a collision avoidance logic version 7.1 of the airborne collision avoidance system (ACAS II) to avoid mid-air collision. That requirement also applies to operators of certain aeroplanes registered in a third country but does not apply to unmanned aircraft systems.
- Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Text with EEA relevance) Regulation · Grade B
In accordance with Regulation (EU) No 1332/2011, aircraft that are not legally required to be equipped with ACAS II but are equipped with that system on a voluntary basis, are to have the collision avoidance logic version 7.1.
- Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Text with EEA relevance) Regulation · Grade B
Pursuant to Article 4(1), point (a), of Regulation (EU) 2018/1139, the new requirements laid down under that Regulation are to reflect the state of the art and the best practices in the field of aviation, taking into account worldwide aviation experience and scientific and technical progress in the respective fields. Therefore, Regulation (EU) No 1332/2011 should be amended to allow access of the aircraft equipped with ACAS Xa to the SES airspace.
- Commission Implementing Regulation (EU) 2025/343 of 17 February 2025 amending Regulation (EU) No 1332/2011 and Implementing Regulation (EU) 2017/373 as regards airborne collision avoidance systems (Text with EEA relevance) Regulation · Grade B
In the Annex to Regulation (EU) No 1332/2011, point AUR.ACAS.1005 is replaced by the following: Performance requirement The following turbine-powered aeroplanes shall be equipped with ACAS II with a collision avoidance logic version 7.1 or with ACAS Xa: Aircraft not referred to in point 1 but which are equipped on a voluntary basis with ACAS II, shall have collision avoidance logic version 7.1 or ACAS Xa. Point 1 shall not apply to unmanned aircraft systems..
- Commission Regulation (EU) 2016/583 of 15 April 2016 amending Regulation (EU) No 1332/2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance) Regulation · Grade B
Commission Regulation (EU) No 1332/2011 requires turbine-powered aeroplanes, with a maximum certificated take-off mass (MCTOM) of more than 5700 kg or authorised to carry more than 19 passengers to be equipped with a new software version 7.1 of the airborne collision avoidance system (ACAS II) to avoid mid-air collision. This requirement also applies to operators of certain aeroplanes registered in a third country.
- Commission Regulation (EU) 2016/583 of 15 April 2016 amending Regulation (EU) No 1332/2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance) Regulation · Grade B
Regulation (EU) No 1332/2011 also requires Union air operators who are subject to Council Regulation (EEC) No 3922/91 to install the new software version 7.1 of ACAS II on their aeroplanes. However, this provision is obsolete as Regulation (EEC) No 3922/91 no longer applies to those operators since its Annex III has been deleted. Commission Regulation (EU) No 965/2012 now applies to those operators instead and contains the necessary rules in this regard. The obsolete provision of Regulation (EU) No 1332/2011 should therefore be deleted.
- Commission Regulation (EU) 2016/583 of 15 April 2016 amending Regulation (EU) No 1332/2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance) Regulation · Grade B
Regulation (EU) No 1332/2011 contains rules on operational procedures applicable in situations where ACAS II gives indication to the flight crew recommending a manoeuvre to ensure separation of the aeroplane from all threats or to maintain existing separation (resolution advisory). As those rules are safety-critical both for pilots and controllers, especially as regards the interface between them, they are better addressed in Commission Implementing Regulation (EU) No 923/2012 instead. Therefore, the rules related to such operational procedures set out in Regulation (EU) No 1332/2011 should be
- Commission Regulation (EU) 2016/583 of 15 April 2016 amending Regulation (EU) No 1332/2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance) Regulation · Grade B
Regulation (EU) No 1332/2011 should therefore be amended accordingly.
- Commission Regulation (EU) 2016/583 of 15 April 2016 amending Regulation (EU) No 1332/2011 laying down common airspace usage requirements and operating procedures for airborne collision avoidance (Text with EEA relevance) Regulation · Grade B
Regulation (EU) No 1332/2011 is amended as follows: