Civil Aviation Order 100.23 (Airworthiness Authorities — General) Instrument 2007

Civil Aviation Order 100.23 (as amended)

Airworthiness authorities — general

made under regulation 33B of the Civil Aviation Regulations 1988.

This compilation was prepared on 26 March 2026 taking into account amendments up to Civil Aviation Orders 100.23 and 100.24 Amendment Instrument 2026.

Prepared by the Legal Services Branch, Legal Division, Civil Aviation Safety Authority, Canberra.

Compilation No. 3

Contents

Page

1A...Name of instrument

1B...Definitions

1....Authority classes and ratings

2....Requirements for issue

3....Examination

4....Period of validity

5....Withdrawal or cancellation of authority

Note to Civil Aviation Order 100.23

1A Name of instrument

 1A.1 This instrument is Civil Aviation Order 100.23 (Airworthiness Authorities — General) Instrument 2007.

 1A.2 This instrument may be cited as Civil Aviation Order 100.23.

 1A.3 A reference in a CASA instrument (being an instrument issued by CASA under a statutory power to issue the instrument) to Section 100.23 of the Civil Aviation Orders is a reference to this instrument.

1B Definitions

Note   In this instrument, certain terms and expressions have the same meaning as they have in the Civil Aviation Act 1988 and the regulations. These include CAR, CASA and Director.

  In this Order:

authority means airworthiness authority.

Note   airworthiness authority is defined in regulation 2 of CAR as meaning an authority under regulation 33B of CAR.

relevant Order, for an application for an airworthiness authority, means the Civil Aviation Order mentioned in subsection 1 for the class of airworthiness authority to be issued.

1 Authority classes and ratings

  Airworthiness authorities will be issued in the following classes and, where applicable, rated in accordance with the appropriate practices or Civil Aviation Orders:

Maintenance Authority Civil Aviation Order 100.24;

Non-Destructive Testing Authority Civil Aviation Order 100.27;

Aircraft Weight Control Authority Civil Aviation Order 100.28.

2 Requirements for issue

 2.1 An applicant for an airworthiness authority must make the application using one of the following application forms, as applicable for the class of the airworthiness authority, and submit the form to CASA:

(a) Application for Initial Issue or Amendment to Scope of a Maintenance Authority;

(b) Application for Initial Issue of, or Additional Method to, a Non-Destructive Testing Authority;

(c) Application for Initial Issue or Amendment of an Aircraft Weight Control Authority.

 2.1A If the relevant Order specifies particular experience or qualifications to be held by the applicant, the applicant must provide full details of such experience or qualifications with the application form.

 2.2 The issue of an authority to an applicant may be refused if the applicant has a disability likely to affect the applicant’s technical skill or judgment.

 2.3 Unless otherwise approved, an applicant for an authority must:

(a) be at least 21 years of age; and

(b) be able to read, write and speak the English language; and

(c) possess such experience as is required by the Director; and

(d) pass such examinations as are required by the Director.

 2.4 An applicant may be required to be interviewed to determine the applicant’s eligibility to complete any written, oral or practical examination relevant to the issue, extension or renewal of an authority.

3 Examination

 3.1 Subject to approval to the contrary, an applicant will be examined in accordance with the requirements detailed in the relevant Order. Where an applicant fails to obtain a pass in an examination, a further attempt may be made at the discretion of the examiner and subject to such conditions as the examiner may specify.

 3.2 Examinations for the issue or extension of authorities will be arranged individually for applicants. Regular periodic examinations for authorities are not provided.

 3.3 The holder of an authority may, at any time, be required to undergo an examination in respect of any rating endorsed on the authority.

4 Period of validity

 4.1 The period for which an authority is valid will depend upon the purpose for which it is issued, and will be specified in the authority. The period will generally not exceed 2 years.

 4.2 Upon application by the holder, an authority may be renewed subject to such of the conditions relating to an original issue as are appropriate.

 4.3 During the period of validity of the authority, the holder must notify CASA, in writing, of any change of address so that CASA may communicate with the holder in relation to the authority if required.

 4.4 The holder of an authority who has a disability, that is likely to affect the holder’s technical skill or judgment, must not exercise the privileges of the authority.

5 Withdrawal or cancellation of authority

  An authority may be withdrawn, or cancelled, in any of the following circumstances:

(a) where the reason for issue of the authority no longer exists; or

(b) where the Director is satisfied that the withdrawal, or cancellation, is in the public interest; or

(c) where the holder of the authority is no longer considered competent by the Director; or

(d) at the request of the holder.

Note to Civil Aviation Order 100.23

The Civil Aviation Order (in force under the Civil Aviation Regulations 1988) as shown in this document comprises Civil Aviation Order 100.23 made as indicated in the Table below.

Table of Orders