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26.50 Seats, berths, safety belts, and harnesses - Regulation (EU) 2015/640
Operators of large aeroplanes used in commercial air transport, type certified on or after 1 January 1958, shall ensure that each flight or cabin crew member seat and its restraint system are configured in order to provide an optimum level of protection in an emergency landing whilst allowing the occupant’s necessary functions and facilitating rapid egress.

Sofema Aviation Services (SAS) www.sassofia.com considers the need and regulatory drivers and understand why are required for existing repairs and changes.

Introduction

What is the rationale for DTE and DTI of repairs and changes?

Essentially it is related to the possibility of Early Fatigue or Fails safe requirements (pre 25 571 Amdt 45) which did not necessarily provide for timely inspection of critical structure so that damaged or failed components could be dependably identified and repaired or replaced before a hazardous condition developed.