Page 93 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

(b) In addition, changes to those variations of the instructions for continued airworthiness shall
be made available to all known operators of a product incorporating the minor change and
shall be made available, on request, to any person required to comply with any of those
instructions.
21.A.108 Availability of operational suitability data
In the case of a change affecting the operational suitability data, the holder of the minor change
approval shall make available:
(a) at least one set of changes to the operational suitability data prepared in accordance with
the applicable operational suitability certification basis, to all known United Kingdom
operators of the changed aircraft, before the operational suitability data must be used by a
training organisation or an United Kingdom operator; and
(b) any further change to the affected operational suitability data, to all known United Kingdom
operators of the changed aircraft; and
(c) on request, the relevant parts of the changes in points (a) and (b) above, to:
1. the CAA; and
2. any person required to comply with one or more elements of this set of operational
suitability data.
21.A.109 Obligations and UKPA marking
The holder of a minor change approval to a type-certificate shall:
(a) undertake the obligations laid down in points 21.A.4, 21.A.105, 21.A.107 and 21.A.108; and
(b) specify the marking, including UKPA (United Kingdom Part Approval) letters, in
accordance with point 21.A.804(a).
Section A Subpart E SUPPLEMENTAL TYPE-CERTIFICATES
Reference Description
21.A.111 Scope
This Subpart establishes the procedure for the approval of major changes to the type-certificate under
supplemental type-certificate procedures, and establishes the rights and obligations of the applicants
for, and holders of, those certificates. In this Subpart, the references to type-certificates include type-
certificates and restricted type-certificates.
21.A.112A Eligibility
Any natural or legal person that has demonstrated, or is in the process of demonstrating, its capability
in accordance with point 21.A.112B may apply for a supplemental type-certificate in accordance with
the conditions laid down in this Subpart.
21.A.112B Demonstration of capability
(a) An applicant for a supplemental type-certificate shall demonstrate its capability by holding
a design organisation approval, issued by the CAA in accordance with Subpart J.
(b) By way of derogation from point (a), as an alternative procedure to demonstrate its
capability, an applicant may seek CAA agreement for the use of procedures setting out the
specific design practices, resources and sequence of activities necessary to comply with
this Subpart.
(c) By way of derogation from point (a), in the case of products referred to in point 21.A.14(c),
an applicant may demonstrate its capability by obtaining the CAA's acceptance of its
certification programme established in accordance with point 21.A.93(b).
21.A.112B GM1 Demonstration of capability for supplemental type-certificate (STC) cases
See also AMC 21.A.14(b) for the details of the alternative procedures.
The following examples of major changes to type design (ref: 21.A.91) are classified in two groups.
Group 1 contains cases where a design organisation approved under Part 21 Subpart J (‘Subpart J
DOA’) should be required, and Group 2 cases where the alternative procedure may be accepted.
They are typical examples but each STC case should be addressed on its merits and there would be
exceptions in practice. This classification is valid for new STCs, not for evolution of STCs, and may
depend upon the nature of the STC (complete design or installation).

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