Page 46 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

assessment of the effects of the minor type design change on the OSD is needed in this
case.
(b) TC changes that only include a major type design change do not need to be assessed for
their effect on the OSD in case the experience of the applicant has demonstrated that
similar changes do not have an effect on the OSD. Examples of major type design
changes and their expected effect on OSD constituents are identified in Table 1 below.
Table 1: Examples of major type design changes and their expected impact on OSD
constituents
(c) Design changes to aircraft for which OSD is not required in accordance with Article 7(a)
(2) of Regulation (EU) No 748/2012, as amended by Regulation (EU) No 69/2014, cannot
trigger the need to establish OSD.
(d) The OSD constituents SIMD and MCSD were not required to be included in the ‘catch-up’
OSD in accordance with Article 7(a)(2) of Regulation (EU) No 748/2012, as amended by
Regulation (EU) No 69/2014. No design change can trigger the need to add that
constituent.
(e) When the design change makes an OSD constituent applicable (see GM No 1 to
21.A.15(d) - Clarification of the applicability of operational suitability data (OSD)
constituents) where it was not applicable before, that OSD constituent should be added to
the application for the approval of the change to the TC.

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