EASA SIB 2011-23R1
Koito Industries Seats — EASA Airworthiness Directive (AD) 2011-0098 — Compliance Information
Summary
EASA Safety Information Bulletin 2011-23R1 provides compliance guidance for EASA Airworthiness Directive 2011-0098 concerning seats manufactured by Koito Industries installed on Airbus, Boeing, Fokker, and McDonnell Douglas aircraft. It details acceptable methods for demonstrating compliance using similarity concepts and outlines procedures for obtaining approval of certification programs and test plans. The bulletin includes updated seat model clusters and critical part numbers relevant to static and dynamic strength testing.
What Changed
This revision of EASA SIB 2011-23 corrects typographical errors, adds new seat models and clusters, re-clusters some seats, and identifies alternative less critical seat part numbers for testing when critical parts fail or are no longer in service. It also clarifies the use of Alternative Methods of Compliance (AMOC) and incorporates test data from Koito Industries under JCAB oversight. The bulletin supersedes the original SIB 2011-23 dated 29 July 2011.
Why It Matters
The bulletin helps operators, maintenance organizations, and compliance teams efficiently meet the requirements of EASA Airworthiness Directive 2011-0098 by providing clear guidance on test article selection and similarity concepts. It reduces the need for redundant testing by grouping seats into clusters and identifying critical parts, thereby optimizing resource use and ensuring continued airworthiness of affected aircraft seating. Understanding the AMOC process and test documentation requirements is essential for regulatory approval and operational compliance.
What To Do
Operators should review the seat clusters and critical part numbers listed in the bulletin to plan compliance testing or use similarity to demonstrate conformity with the AD. Test plans and reports must be submitted to EASA via an AMOC application using EASA Form 42, including affected aircraft serial numbers and seat part numbers. Compliance actions should align with the effective date of AD 2011-0098, which is 2011-08-01, and operators should maintain communication with EASA for approval and further updates.