# Commission Regulation (EU) No 1321/2014 of 26 November 2014 on the continuing airworthiness of aircraft and aeronautical products, parts and appliances, and on the approval of organisations and personnel involved in these tasks (Recast) (Text with EEA relevance), Division CAO.A.055: Maintenance data and work orders

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

(a) The CAO shall hold and use applicable current maintenance data specified in point M.A.401 of Annex I (Part-M) or in point ML.A.401 of Annex Vb (Part-ML), as applicable, in the performance of maintenance, including modifications and repairs. However, in the case of customer-provided maintenance data, it shall only be required to hold such data when the work is in progress.
(b) Before the commencement of maintenance, a written work order shall be agreed between the CAO and the person or organisation requesting maintenance, in a manner that clearly establishes the maintenance to be carried out.

---
Source: https://www.legislation.gov.uk/eur/2014/1321/annex/Vd/section/A/division/cao.a.055 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-1321/annex-Vd/section-A/division-cao.a.055
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.