Subpart C - Design Changes

21.71 Purpose

(a) The Order requires that design changes are completed in a manner approved by the Governor. This Subpart details the requirements for the approval of design changes and repairs.

(b) The approval of the installation of a design change by the Governor is a single process based on the acceptance of the certification process by an NAA specified in paragraph 21.25(a)(1). The design change approval process is therefore similar, irrespective of whether the actual design change is classified as MINOR or MAJOR by the applicable NAA in 21.25(a).

(c) The applicant for a design change shall provide all the necessary substantiation data of the design change to the Governor.

21.73 Design change approval process

(a) The applicant for approval of a design change to an aircraft shall demonstrate to the satisfaction of the Governor that the design change:

(1) has been certified, approved or accepted by an NAA specified in paragraph 21.25(a) that issued the type certificate identified on the Type Acceptance Certificate, against which the C of A for the aircraft has been issued; or

(2) has been certified, approved or accepted by an NAA specified in paragraph 21.25(a) that is not the issuing state of the Type Certificate identified on the Type Acceptance Certificate against which the C of A for the aircraft was issued and has been declared to comply with the applicable Type Certification standards identified on the Type Acceptance Certificate for the aircraft by a suitably approved design organisation or individual; or

(3) through bilateral agreement has been certified, approved or accepted by the NAA specified in paragraph 21.25(a) that issued the type certificate identified on the Type Acceptance Certificate against which the C of A for the aircraft has been issued; or

(4) for design changes that have been certified, approved or accepted using the processes of and classified as Minor by an NAA specified in paragraph 21.25(a) that is not the issuing state of the Type Certificate identified on the Type Acceptance Certificate against which the C of A for the aircraft was issued.

(b) The applicant for approval of the design change shall provide the following information in a manner acceptable to the Governor:

(1) sufficient technical evidence to demonstrate that the design change certification standard complies with the Type Acceptance Certificate against which the Certificate of Airworthiness was granted or sufficient technical evidence to establish compliance with the Type Certification basis of the aircraft; and

(2) appropriate documentation and substantiating data for the design change; and

(3) sufficient technical evidence of the applicability of the design change to the aircraft; and

(4) a declaration of interoperability and compatibility with the existing type design and repair status of the aircraft by an organisation or individual acceptable to the Governor; and

(5) if applicable, a statement of compliance with the requirements of the Air Navigation (Overseas Territories)(Environmental Standards) Order in respect of the design change; and

(6) continued airworthiness information for the design change or repair and its integration into the appropriate maintenance programme; and

(7) when reference is made to a bilateral agreement with an NAA not specified in paragraph 21.25(a)(1), sufficient information and specific reference to identify the clause of the agreement that permits the approval or acceptance of the design change.

21.77 Continued airworthiness responsibilities

(a) The organisation under which the statement of compliance for a design change was issued shall undertake the continued airworthiness responsibilities required in respect of the change.

(b) ‚ÄčAny issues of continued airworthiness including those initiated by a design change shall be reported to the Governor and the organisation responsible for the design.

21.79 Acceptance of design changes by the issue of a Certificate of Airworthiness

(a) When an aircraft is first transferred to a Territory register individual approval of each design change embodied on that aircraft is not required. All such design changes may therefore be accepted by the issue of a Certificate of Airworthiness for that aircraft provided that:

(1) the design change is recorded in the maintenance records for the aircraft at the time of initial issue of the Certificate of Airworthiness; and

(2) there is evidence that the design change meets the applicable airworthiness requirements; and

(3) the transfer document or Certificate of Airworthiness for Export encompasses all such design changes incorporated on the aircraft.

(b) Acceptance of a design change under paragraph 21.79(a) applies only to the change embodied on the individual aircraft for which the Certificate of Airworthiness has been issued.

21.81 Service Bulletins

A design change covered by the issue of a Service Bulletin or equivalent document issued by the Type Certificate Holder is deemed to be approved by the Governor provided that:

(a) the design change is approved by an NAA specified in paragraph 21.25(a) to the applicable Type Certification standards identified on the Type Acceptance Certificate for the aircraft; and

(b) there is sufficient technical evidence of interoperability and compatibility with the existing type design and repair status of the aircraft; and

(c) continued airworthiness information for design changes and repairs is available and integrated into the appropriate maintenance programme.


Change Information

  1. First Issue - published for information June 2004
  2. Second issue - published for information April 2005
  3. Third issue – released for gazetting July 2005
  4. Fourth issue – April 2011
  5. Fifth issue – October 2013
  6. Sixth issue – January 2015
  7. Seventh issue - August 2017
  8. Eighth issue - January 2019

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