Airworthiness Approval Notes (AANs) represent an approval at a point in time. The approval holder going
out of business or changes to CAA policies or requirements do not necessarily cause updates to the AANs.
The designs covered by AANs may therefore no longer be available under the same conditions or even at
Whilst the AANs are publicly available, readers should not assume that technical reports, drawings or
documents referred to therein are also publicly available.
AANs do not, intentionally, contain sufficient information from which to "copy" a design, evidence of
identicality is the responsibility of applicants for design approvals where they are attempting to oblige
the CAA to make use of technical information it already holds for the purposes of easing the path of
subsequent approval for a similar design.
Most AANs issued after AAN Number 21700 and some earlier AANs that have been re-issued
after 29 July 2002 are available from this site. Documents prior to 1992 were not usually stored electronically and are
consequently only available as a paper copy.
There are currently no plans to provide these in an electronic format.
It is a function of the Safety Regulation Group to issue Certificates of Airworthiness or permits to fly to allow aircraft to fly in compliance with the UK Air Navigation Order 2009. Implicit in this activity is the task of agreeing the standards to be applied, and that compliance with those standards has been shown in the particular case by the Applicant for the certificate or permit. A similar activity is required to approve modifications so that a Certificate of Airworthiness or permit may be issued or reinstated for a modified aircraft.
The Airworthiness Approval Note is a document which records the approval that the particular certificate or permit may be issued (or reinstated following modification). In so doing the AAN provides a record of (either directly or by reference to controlled documents) the build definition of the aircraft or modification, the standards that have been applied, the justification of compliance with those requirements, any restrictions or limitations affecting the approval, and a statement of approval.
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