{
  "url": "https://openlegislation.uk/eu-regulation-2014-1321/annex-Vb/division-1/division-sectiona/division-subparte/division-ml.a.504",
  "json_url": "https://openlegislation.uk/eu-regulation-2014-1321/annex-Vb/division-1/division-sectiona/division-subparte/division-ml.a.504.json",
  "legislation": "eur/2014/1321",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2014-1321",
  "path": "annex/Vb/division/1/division/sectiona/division/subparte/division/ml.a.504",
  "kind": "division",
  "number": "ML.A.504",
  "heading": "Control of unserviceable components",
  "text": "(a) A component shall be considered unserviceable in any of the following circumstances:\n(1) expiry of the component's service life limit as defined in the AMP;\n(2) non-compliance with the applicable ADs and other continued-airworthiness requirement mandated by the CAA;\n(3) absence of the necessary information to determine the airworthiness status of the component or its eligibility for installation;\n(4) evidence of component defects or malfunctions;\n(5) component involvement in an incident or accident likely to affect its serviceability.\n(b) Unserviceable components shall be identified as one of the following:\n(1) unserviceable and stored in a secure location under the control of an approved maintenance organisation or independent certifying staff until a decision is made on the future status of such components;\n(2) unserviceable by the person or organisation that declared the component unserviceable, and its custody shall be transferred to the aircraft owner after documenting such transfer in aircraft maintenance record system referred to in point ML.A.305.\n(c) Components which have reached their certified life limit or contain a non-repairable defect or malfunction shall be classified as unsalvageable and shall not be permitted to re-enter the component supply system unless certified life limits have been extended or a repair solution has been approved in accordance with point ML.A.304.\n(d) Any person or organisation responsible pursuant to point ML.A.201 shall in the case of an unsalvageable component, as provided for in point (c), take one of the following actions:\n(1) retain such component in a location referred to in point (b)(1);\n(2) arrange for the component to be mutilated in a manner that ensures that it is beyond economic salvage or repair before relinquishing responsibility for such a component.\n(e) Notwithstanding point (d), a person or organisation responsible pursuant to point ML.A.201 may transfer responsibility of components classified as unsalvageable without mutilation to an organisation for training or research.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Inserted by Commission Implementing Regulation (EU) 2019/1383 of 8 July 2019 amending and correcting Regulation (EU) No 1321/2014 as regards safety management systems in continuing airworthiness management organisations and alleviations for general aviation aircraft concerning maintenance and continuing airworthiness management (Text with EEA relevance)."
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Word in Annex 5b point ML.A.504(a) substituted (31.12.2020) by The Aviation Safety (Amendment) (EU Exit) Regulations 2020 (S.I. 2020/1116), regs. 1(2), 76(7)(b)"
    },
    {
      "type": "X",
      "label": "X1",
      "text": "Inserted by Corrigendum to Commission Implementing Regulation (EU) 2019/1383 of 8 July 2019 amending and correcting Regulation (EU) No 1321/2014 as regards safety management systems in continuing airworthiness management organisations and alleviations for general aviation aircraft concerning maintenance and continuing airworthiness management (Official Journal of the European Union L 228 of 4 September 2019)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2014/1321/annex/Vb/division/1/division/sectiona/division/subparte/division/ml.a.504",
    "retrieved_at": "2026-11-01T14:47:03.190425+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}