Page 240 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

involvement pursuant to point 21.B.100(b), has not found any non-compliance with the
type-certification basis and environmental protection requirements.
Section B Subpart N NOT APPLICABLE
Reference Description

Section B Subpart O UNITED KINGDOM TECHNICAL STANDARD ORDER AUTHORISATIONS
Reference Description
21.B.480 Issuance of an UKTSO authorisation
The CAA shall issue an UKTSO authorisation, provided that:
(a) the applicant has complied with point 21.A.606;
(b) the CAA, through its verifications of the demonstration of compliance in accordance with
the level of involvement pursuant to point 21.B.100(b), has not found any non-compliance
with the technical conditions of the applicable UKTSO or with deviations therefrom
approved in accordance with point 21.A.610, if any; and
(c) no feature or characteristic has been identified that may make the article unsafe for the
uses for which certification is requested.

Section B Subpart P PERMIT TO FLY
Reference Description
21.B.520 Investigation
(a) The CAA shall perform sufficient investigation activities to justify the issuance, or
revocation of the permit to fly.
(b) The CAA shall prepare evaluation procedures covering at least the following elements:
1. evaluation of the eligibility of the applicant;
2. evaluation of the eligibility of the application;
3. evaluation of the documentation received with the application;
4. inspection of the aircraft;
5. approval of the flight conditions in accordance with point 21.A.710(b).
21.B.520(b) AMC Application for a permit to fly
The CAA must receive an application for permit to fly in a form and manner established by that
authority, e.g. on the CAA Form 21 (see below) completed by the applicant.

21.B.525 Issue of permits to fly
The CAA shall issue a permit to fly (CAA Form 20a, see Appendix III) without undue delay:
(a) upon presentation of the data required by point 21.A.707; and
(b) when the flight conditions referred to in point 21.A.708 have been approved in accordance
with point 21.A.710; and
(c) when the CAA, through its own investigations, which may include inspections, or through
procedures agreed with the applicant, is satisfied that the aircraft conforms to the design
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