FAQ n.132523

The same policy is currently applicable to CS-25 aircraft types applies also to CS-29, CS-23 level 4, and CS-27 Cat A aircraft types. For CS-23 levels 1, 2, and 3 and for CS-27 non-CAT A, EASA will evaluate the need for using the same approach on a case-by-case basis, based on the risk that the installation could pose to aircraft safety.

When validation with foreign authorities would be envisaged, EASA recommends checking potential means of compliance discrepancies related to lithium batteries.