# Commission Implementing Regulation (EU) 2015/1998 of 5 November 2015 laying down detailed measures for the implementation of the ... basic standards on aviation security (Text with EEA relevance), Division 11.4.1

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

Persons operating x-ray or EDS equipment shall be subject to recurrent training consisting of image recognition training and testing. This shall take the form of:
(a)classroom and/or computer based training; or
(b)on-the-job TIP training, on condition that a TIP library of at least 6 000 images, as specified below, is employed on the x-ray or EDS equipment used and the person works with this equipment during at least one third of his working hours.
...
For classroom and/or computer based training, persons shall be subject to image recognition training and testing for at least 6 hours in every 6 month period, using either:
an image library containing at least 1 000 images of at least 250 different threat articles, including images of component parts of threat articles, with each article captured in a variety of different orientations, and arranged to provide an unpredictable selection of images from the library during the training and testing; or
the most frequently missed TIP images from the TIP library in use combined with images of recently captured threat articles relevant for the type of screening operation and covering all types of relevant threat articles if only used once for the training of a given screener over a three-year period.
For on-the-job TIP training, the TIP library shall consist of at least 6 000 images of at least 1 500 different threat articles, including images of component parts of threat articles, with each article captured in a variety of different orientations.

---
Source: https://www.legislation.gov.uk/eur/2015/1998/annex/n4/division/11/division/11.4/division/11.4.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2015-1998/annex-n4/division-11/division-11.4/division-11.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.