EASA this week issued guidance
on complying with its June 2 airworthiness directive
ordering testing of Koito seats.
The guidance outlines how operators can apply the "similarity" concept, which allows use of static and dynamic test results from some in-service seats to others, similar seats. EASA has developed "seat clusters" for each airframe OEM. Each cluster identifies a key part number that can be tested on behalf of a set of seat models.
Read the full EASA Safety Information Bulletin (SIB) here (.pdf)