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.