Article 67(1).

Operators, aircraft operators and regulated entities shall retain at least the following:

1. COMMON ELEMENTS FOR INSTALLATIONS, AIRCRAFT OPERATORS AND REGULATED ENTITIES

(1) The monitoring plan approved by the competent authority;

(2) Documents justifying the selection of the monitoring methodology and the documents justifying temporal or non-temporal changes of monitoring methodologies and, where applicable, tiers approved by the competent authority;

(3) All relevant updates of monitoring plans notified to the competent authority in accordance with Article 15, and the competent authority's replies;

(4) All written procedures referred to in the monitoring plan, including the sampling plan where relevant, the procedures for data flow activities and the procedures for control activities;

(5) A list of all versions used of the monitoring plan and all related procedures;

(6) Documentation of the responsibilities in connection to the monitoring and reporting;

(7) The risk assessment performed by the operator, aircraft operator or regulated entity, where applicable;

(8) The improvement reports in accordance with Article 69;