CS 26 303(a) and (c) Limit of validity

CAA ORS9 Decision No. 1

Compliance with points 26.303(a) and (c) of UK Part-26 is demonstrated by complying with CS 25.571 Amendment 19, or subsequent amendment, or with the following:

(a) The evaluation supporting the LOV required by point 26.303 of Part-26 includes a substantiation that WFD will not occur in the aeroplane structure. An ALS exists and includes the LOV of each aeroplane structural configuration required by point 26.303 of UK Part-26 and each LOV is supported by sufficient test evidence, analysis and, if available, service experience and teardown inspection results of high-time aeroplanes of similar structural design, accounting for differences in operating conditions and procedures. Where the certification basis of the aeroplane includes mixed requirements with respect to the CS/CFR Part 25/JAR 25.571 amendment status, the earliest amendment is used to define the compliance times.

(b) A list is established of all the maintenance actions upon which the LOV is dependent. The list identifies existing mandated actions, existing actions that have not been mandated at the date of entry into force of the rule and any new maintenance actions required. A schedule for the development and submission of the maintenance actions to CAA is agreed by CAA prior to the approval of the LOV. For compliance times, refer to points 26.303(b) or 26.303(d) and 26.303(e) of UK Part-26, as applicable. The new maintenance actions are established, and, together with the existing non-mandated actions, are submitted to CAA for approval according to the schedule agreed by CAA.