Page 158 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

not by an agreement between two DOAs, and provided that the availability of the person
ensures that response times will be adequate;
9. a CVE may also hold any of the other nominations, as long as there is an independent
check of compliance per AMC-ELA No 1 to 21.A.239(b).
Due to the typically small size of the design organisations and the low complexity and criticality of the
products within the scope of AMC-ELA, no specific provisions are required to ensure that there is full
and efficient coordination between departments and within departments in respect of airworthiness,
operational suitability and environmental protection matters, provided that evidence of this
coordination can be observed during the surveillance activities.
21.A.245 GM1 Requirements for approval
See 21.A.245
1. General. The data submitted in accordance with 2A.243 should show that sufficient skilled
personnel are available and suitable technical and organisational provisions have been
made for carrying out the Type Investigation defined by GM No 1 to 2A.239(a), paragraph
2.3.
2. Personnel. The applicant should show that the personnel available to comply with
21.A.245(a) are, due to their special qualifications and number, able to provide assurance
of the design or modification of a product, as well as the compilation and verification of all
data needed to meet the applicable CS and environmental protection requirements while
taking into account the present state of the art and new experience.
3. Technical. The applicant should have access to:
a) Workshops and production facilities which are suitable for manufacturing prototype
models and test specimens.
b) Accommodation and test facilities which are suitable for carrying out tests and
measurements needed to demonstrate compliance with the CS and environmental
protection requirements. The test facilities may be subjected to additional technical
conditions related to the nature of tests performed.
4. Organisation. The data submitted in accordance with 21.A.243 should show that:
4.1 The Head of the design organisation for which an application for approval has been
made, has the direct or functional responsibility for all departments of the
organisation which are responsible for the design of the product. If the departments
responsible for design are functionally linked, the Head of the design organisation
still carries the ultimate responsibility for compliance of the organisation with Part 21
Subpart J.
4.2 An Office of Airworthiness, or equivalent function, has been established and staffed
on a permanent basis to act as the focal point for co-ordinating airworthiness,
operational suitability and environmental protection matters (see GM No 1 to
21.A.239(a) paragraph 3.1.4); it reports directly to the Head of the design
organisation or is integrated into an independent quality assurance organisation
reporting to the Head of the design organisation.
4.3 [Reserved]
4.4 Responsibilities for all tasks related to Type Investigations are assigned in such a
way that gaps in authority are excluded.
4.5 The responsibility for a number of tasks as in paragraph 4.4 may be assigned to
one person especially in the case of simple projects.
4.6 Co-ordination between technical departments and the persons in charge of the
system monitoring required by 21.A.239(a)(3) has been established:
a. to ensure quick and efficient reporting and resolution of difficulties
encountered using the handbook and associated procedures
b. to maintain the design assurance system
c. to optimise auditing activities.
21.A.245 GM2 Requirements for approval – Organisations designing minor changes to type design or minor repairs to
products
The data submitted in accordance with 21.A.243 should show that:
1. The manager responsible for design has the direct or functional responsibility for all
departments of the organisation which are involved in the design of minor changes to type
design or minor repairs to products.
2. Person(s) have been nominated to liaise with the CAA and to co-ordinate airworthiness,
operational suitability and environmental protection matters. Their position in the
organisation should allow direct report to the manager responsible for design.
3. Responsibilities for all tasks related to the design and approval of minor changes to type
design or minor repairs to products are assigned to ensure that all areas are covered
4. The responsibility for a number of tasks as in paragraph 3 may be assigned to one person
especially in the case of simple projects.
21.A.247 Changes in design assurance system
After the issue of a design organisation approval, each change to the design assurance system that is
significant to the showing of compliance or to the airworthiness, operational suitability and
environmental protection of the product, shall be approved by the CAA. An application for approval
shall be submitted in writing to the CAA and the design organisation shall demonstrate to the CAA, on
the basis of submission of proposed changes to the handbook, and before implementation of the
change, that it will continue to comply with this Subpart after implementation.
21.A.247 GM Significant changes in the design assurance system
In addition to a change in ownership (see 21.A.249), the following changes to the design assurance
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