# 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), Division (eb): Clearance related to altimetry

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

(1) For flights in areas where a transition altitude is established, the vertical position of the aircraft shall, except as provided for in (5) below, be expressed in terms of altitudes at or below the transition altitude and in terms of flight levels at or above the transition level. While passing through the transition layer, the vertical position shall be expressed in terms of flight levels when climbing and in terms of altitudes when descending.
(2) The flight crew shall be provided with the transition level in due time prior to reaching it during descent.
(3) Except when it is known that the aircraft has already received the information in a directed transmission, a QNH altimeter setting shall be included in:
(i)the descent clearance, when first cleared to an altitude below the transition level;
(ii)the approach clearance or the clearance to enter the traffic circuit;
(iii)the taxi clearance for departing aircraft.
(4) A QFE altimeter setting shall be provided to aircraft on request or on a regular basis in accordance with local arrangements.
(5) When an aircraft which has been given clearance to land is completing its approach using atmospheric pressure at aerodrome elevation (QFE), the vertical position of the aircraft shall be expressed in terms of height above aerodrome elevation during that portion of its flight for which QFE may be used, except that it shall be expressed in terms of height above runway threshold elevation:
(i) for instrument runways if the threshold is 2 m (7 ft) or more below the aerodrome elevation; and
(ii) for precision approach runways.

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Source: https://www.legislation.gov.uk/eur/2012/923/annex/section/8/division/SERA.8015/division/eb (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/section-8/division-SERA.8015/division-eb
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.