# 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, Division (a): The operator shall report recorded or communicated occurrences of height-keeping errors caused by malfunction of aircraft equipment or of operational nature, equal to or greater than:

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

(1)a total vertical error (TVE) of ± 90 m (± 300 ft);
(2)an altimetry system error (ASE) of ± 75 m (± 245 ft); and
(3)an assigned altitude deviation (AAD) of ± 90 m (± 300 ft).

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/V/division/subpart+d/division/sparvsm115/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-V/division-subpart+d/division-sparvsm115/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.