Page 130 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

Terms of approval document(s) will be issued by the CAA under 21.A.135 to identify the scope of
work, the products, and/or categories for which the holder is entitled to exercise the privileges defined
in 21.A.163.
The codes shown against each scope of work item are intended for use by the CAA for purposes
such as managing, administering and filing details of approvals. It may also assist in the production
and publication of a list of approval holders.
The scope of work, the Products, Parts, or Appliances for which the POA holder is entitled to exercise
the privileges defined in 21.A.163 will be described by the CAA as follows:
FOR PRODUCTS:
1. General area, similar to the titles of the corresponding certification codes.
2. Type of Product, in accordance with the type-certificate.
FOR PARTS AND APPLIANCES:
1. General area, showing the expertise, e.g., mechanical, metallic structure.
2. Generic type, e.g., wing, landing gear, tyres.

21.A.153 Changes to the terms of approval
Each change to the terms of approval shall be approved by the CAA. An application for a change to
the terms of approval shall be made in a form and manner established by the CAA. The applicant
shall comply with the applicable requirements of this Subpart.
21.A.153 AMC Changes to the terms of approval – Application for a change to the terms of approval
CAA Form 51 (see AMC No 1 to 21.B.240) must be obtained from the CAA and completed in
accordance with the procedures of the POE.
The information entered on the form is the minimum required by the CAA to assess the need for
change of the production organisation approval.
The completed form and an outline of the changed POE, and details of the proposed change to POA
terms of approval must be forwarded to the CAA.
21.A.153 AMC1-ELA Changes to the terms of approval – Application for a change to the terms of approval
CAA Form 51 (see AMC No 1 to 21.B.240) should be obtained from the CAA and completed in
accordance with the instructions provided by the CAA. The information entered on the form is needed
by the CAA in order to assess whether the production organisation approval is to be amended. The
completed form should be forwarded to the CAA. The applicant and the CAA can agree on whether
the assessment for a change in approval can be completed via a desktop audit or through a
surveillance audit.
21.A.157 Investigations
A production organisation shall make arrangements that allow the CAA to make any investigations,
including investigations of partners and subcontractors, necessary to determine compliance and
continued compliance with the applicable requirements of this Subpart.
21.A.157 GM Investigations – Arrangements
The arrangements made by the applicant for, or holder of an approval under Part 21 Section A
Subpart G should allow the CAA to make investigations that include the complete production
organisation including partners, sub-contractors and suppliers, whether they are in the State of the
applicant or not.
The investigation may include; audits, enquiries, questions, discussions and explanations, monitoring,
witnessing, inspections, checks, flight and ground tests and inspection of completed products, parts
or appliances produced under the POA.
In order to maintain its confidence in the standards achieved by a POA holder or applicant the CAA
may make an investigation of a sample product part or appliance and its associated records, reports
and certifications.
The arrangements should enable the organisation to give positive assistance to the CAA and co-
operate in performing the investigation during both initial assessment and for the subsequent
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