21.A.90C Stand-alone changes to the Instructions for Continued Airworthiness

Changes to the ICA are considered to be stand-alone changes when they are not directly prepared together with a change to the type design. Stand-alone changes to the ICA are usually prepared and issued, for example, for the purpose of making corrections, improvements, to include feedback from users, or to provide alternatives. Also, when the ICA are completed after the product (or change to the product) was approved, this is considered to be a stand-alone change to the ICA. When a non-ALS ICA change is triggered by a change to the type design, this does not affect the overall classification of the type certificate change as per point 21.A.91. Stand-alone changes are usually straightforward changes, and are not considered to require additional work in order to show compliance. However, they must be managed in accordance with a process accepted by EASA under point 21.A.239 or point 21.A.14(b), for discharging the obligation to keep the ICA up to date. Examples of changes that may require additional activities in order to show compliance are changes to the CDCCL, and EWIS ICA.