# Commission Implementing Regulation (EU) No 923/2012 of 26 September 2012 laying down the common rules of the air and operational provisions regarding services and procedures in air navigation and amending Implementing Regulation (EU) No 1035/2011 and Regulations (EC) No 1265/2007, (EC) No 1794/2006, (EC) No 730/2006, (EC) No 1033/2006 and (EU) No 255/2010 (Text with EEA relevance), Appendix 4

Extent: E+W+S+N.I.

ATS airspace classes — services provided and flight requirements
(SERA.6001 and SERA.5025(b) refers)
When the level of the transition altitude is lower than 3 050 m (10 000 ft) AMSL, FL 100 should be used in lieu of 10 000 ft. Competent authority may also exempt aircraft types, which for technical or safety reasons, cannot maintain this speed.
Pilots shall maintain continuous air-ground voice communication watch and establish two-way communication, as necessary, on the appropriate communication channel in RMZ.
Air-ground voice communications mandatory for flights participating in the advisory service. Pilots shall maintain continuous air-ground voice communication watch and establish two-way communication, as necessary, on the appropriate communication channel in RMZ.
Class
Type of flight
Separation provided
Service provided
Speed limitation
Radio communication capability requirement
Continuous two-way air-ground voice communication required
Subject to an ATC clearance
A
IFR only
All aircraft
Air traffic control service
Not applicable
Yes
Yes
Yes
B
IFR
All aircraft
Air traffic control service
Not applicable
Yes
Yes
Yes
VFR
All aircraft
Air traffic control service
Not applicable
Yes
Yes
Yes
C
IFR
IFR from IFR
IFR from VFR
Air traffic control service
Not applicable
Yes
Yes
Yes
VFR
VFR from IFR
(1) Air traffic control service for separation from IFR;
(2) Air traffic control service, VFR/VFR traffic information (and traffic avoidance advice on request)
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
Yes
Yes
D
IFR
IFR from IFR
Air traffic control service, traffic information about VFR flights
(and traffic avoidance advice on request)
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
Yes
Yes
VFR
Nil
Air traffic control service, IFR/VFR and VFR/VFR traffic information (and traffic avoidance advice on request)
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
Yes
Yes
E
IFR
IFR from IFR
Air traffic control service and, as far as practical, traffic information about VFR flights
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
Yes
Yes
VFR
Nil
Traffic information as far as practical
250 kts IAS below
3 050 m
(10 000 ft) AMSL
No
No
No
F
IFR
IFR from IFR as far as practical
Air traffic advisory service; flight information service if requested
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
No
No
VFR
Nil
Flight information service if requested
250 kts IAS below
3 050 m
(10 000 ft) AMSL
No
No
No
G
IFR
Nil
Flight information service if requested
250 kts IAS below
3 050 m
(10 000 ft) AMSL
Yes
No
No
VFR
Nil
Flight information service if requested
250 kts IAS below
3 050 m
(10 000 ft) AMSL
No
No
No

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Source: https://www.legislation.gov.uk/eur/2012/923/annex/appendix/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/appendix-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.