EASA AD 2021-0137R1
SAFRAN SEATS - Pilot and Co-pilot Seats / Longitudinal Locking System Pins — Measurement / Adjustment
Summary
EASA Airworthiness Directive 2021-0137R1 is an updated safety directive addressing the longitudinal locking system pins on SAFRAN SEATS 191 series pilot and co-pilot seats, specifically part numbers 19101-00-00 and 19102-00-00, commonly installed on COMAC ARJ21-700 aircraft. The directive mandates measurement and adjustment of the seat locking pins to prevent unintended seat displacement during critical flight phases. This AD ensures continued airworthiness by requiring compliance with SAFRAN Seats Service Bulletin 191-25-006.
What Changed
This revision of EASA AD 2021-0137 corrects the applicability by excluding seats with amendment C embodied, which were previously included in error. It maintains the original requirements for measuring and adjusting the seat locking pins but clarifies which seats are affected. The revision updates the effective date to 3 March 2025.
Why It Matters
This AD is crucial for aviation professionals because improper engagement of the seat locking pins can lead to sudden seat movement, potentially compromising pilot control and safety during critical flight phases. Operators and maintenance teams must ensure compliance to prevent in-flight hazards and maintain regulatory conformity. Accurate identification of affected seats avoids unnecessary inspections and focuses resources on genuine risks.
What To Do
Operators must measure the length of the left-hand and right-hand longitudinal seat locking pins within 750 flight hours after 22 June 2021, following SAFRAN Seats Service Bulletin 191-25-006. If pin lengths are outside specified margins, adjustments must be made before the next flight. Seats with amendment C embodied are excluded from these requirements.