Final Certification Memorandum CM-21.A-A-003 on "Analysis of occurrence reports and determination of possible unsafe conditions originated by human performance issues on large aeroplanes"

Starting date of initial consultation

This final Certification Memorandum provides guidance to large aeroplanes design approval holders (DAHs) for analysing collected reports of and information related to in-service occurrences involving human interventions, which has resulted or may result in unsafe conditions.

It complements the limited guidance currently existing in GM1 21.A.3B(b) for establishing if a condition originated by human interventions on a large aeroplane is unsafe.

In addition, EASA has published Safety Information Bulletin (SIB) No 2023-08R1 to remind commercial air transport operators of large aeroplanes of the obligation, under Commission Regulation (EU) No 965/2012, to also report to DAHs in-service occurrences involving human interventions.