Page 74 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

H.1.2 In order to efficiently determine and agree upon a certification basis with the CAA,
the following information is useful to understand the applicant’s position:
H.1.2.1 The scope of the change. This includes a high-level description of the
physical and functional changes and performance/functional characteristics,
which are changed as a result of the physical or functional change, and the
certification specifications for which compliance demonstration is required as
a result of the change.
H.1.2.2 The amendment level of all the applicable certification specifications at the
date of application.
H.1.2.3 The proposed certification basis, including amendment levels.
H.1.2.4 Applicants who propose a certification basis that includes amendment levels
earlier than what was in effect at the date of application should include the
exception as outlined in point 21.A.101 and their justification if needed.
H.1.3 Exceptions.
H.1.3.1 Unrelated changes that are not significant (point 21.A.101(b)(1)).
H.1.3.2 Not affected by the change (point 21.A.101(b)(2)).
H.1.3.3 Compliance with the certification specification would not contribute materially
to the level of safety (point 21.A.101(b)(3)).
H.1.3.4 Compliance with the certification specification would be impractical (point
21.A.101(b)(3)).
H.1.4 One easy way to document the proposed certification basis is using a tabular form
as shown in Table below.
Table H1. Tabular Form for Documenting a Proposed Certification Basis
H.1.5 Best Practices.
H.1.5.1 Account for all certification specifications, even if they are not applicable.
H.1.5.2 Mark certification specifications that are not applicable as ‘N/A’.
H.1.5.3 If more than one amendment level is used depending on the area of the
product, list all areas and amendment levels at each area with proper
justification.
H.1.5.4 If the justification is long, provide the justification below the table and only
place the certification specification reference and note in the comment field.
H.1.5.5 Include airworthiness and OSD standards required by other EU regulations
(e.g. Part-26) of affected areas.
H.2 Example 2.
Pages 129 through 135 of this Appendix contain another example for documenting a
proposed certification basis.

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