HKAR-21 Certification of Aircraft and Related Products, Parts and ...
HKAR-21 Certification of Aircraft and Related Products, Parts and ...
HKAR-21 Certification of Aircraft and Related Products, Parts and ...
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<strong>HKAR</strong>-<strong>21</strong> SECTION 1<br />
corresponding airworthiness code incorporated by reference in the type certificate.<br />
The applicant may show compliance with an earlier amendment <strong>of</strong> an airworthiness<br />
code for any <strong>of</strong> the following:<br />
1 A change that the Director-General finds not to be significant. In determining<br />
whether a specific change is significant, the Director-General considers the<br />
change in context with all previous relevant design changes <strong>and</strong> all related<br />
revisions to the applicable certification specifications incorporated in the type<br />
certificate for the product. Changes that meet one <strong>of</strong> the following criteria are<br />
automatically considered significant:<br />
(i) The general configuration or the principles <strong>of</strong> construction are not retained.<br />
(ii) The assumptions used for certification <strong>of</strong> the product to be changed do not<br />
remain valid.<br />
2 Each area, system, part or appliance that the Director-General finds is not affected<br />
by the change.<br />
3 Each area, system, part or appliance that is affected by the change, for which the<br />
Director-General finds that compliance with an airworthiness code described in<br />
paragraph (a) would not contribute materially to the level <strong>of</strong> safety <strong>of</strong> the changed<br />
product or would be impractical.<br />
(c)<br />
(d)<br />
(e)<br />
An applicant for a change to an aircraft (other than a rotorcraft) <strong>of</strong> 2,722 kg (6,000 lb)<br />
or less maximum weight or to a non-turbine rotorcraft <strong>of</strong> 1,361 kg (3,000 lb) or less<br />
maximum weight may show that the changed product complies with the type<br />
certification basis incorporated by reference in the type certificate. However, if the<br />
Director-General finds that the change is significant in an area, the Director-General<br />
may designate compliance with an amendment to the type certification basis<br />
incorporated by reference in the type certificate, in effect at the date <strong>of</strong> the application,<br />
<strong>and</strong> any certification specification that the Director-General finds is directly related,<br />
unless the Director-General also finds that compliance with that amendment or<br />
certification specification would not contribute materially to the level <strong>of</strong> safety <strong>of</strong> the<br />
changed product or would be impractical.<br />
If the Director-General finds that the airworthiness code in effect at the date <strong>of</strong> the<br />
application for the change does not provide adequate st<strong>and</strong>ards with respect to the<br />
proposed change, the applicant shall also comply with any special conditions, <strong>and</strong><br />
amendments to those special conditions, prescribed under the provisions <strong>of</strong> <strong>HKAR</strong><br />
<strong>21</strong>.16B, to provide a level <strong>of</strong> safety equivalent to that established in the airworthiness<br />
code in effect at the date <strong>of</strong> the application for the change.<br />
An application for a change to a type certificate for large aeroplanes <strong>and</strong> large<br />
rotorcraft is effective for five years, <strong>and</strong> an application for a change to any other type<br />
1 May 2012 1-16<br />
Issue 3
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