EASA AD US-2021-07-09
Apr 16, 2021Superseded by FAA AD 2023-03-15
FAA Airworthiness Directive 2021-07-09 is a final rule superseding AD 2007-07-03 and applies to certain Boeing 747 series airplanes including models 747-100, 747-200, 747-300, 747-400, 747SR, and 747SP. It addresses issues with hot air leaking from trim air diffuser ducts (TADDs), including failures of high temperature composite material TADDs, which can damage the center wing fuel tank and create a fire or explosion risk. The directive mandates repetitive inspections and corrective actions to ensure continued airworthiness.
- Boeing 747100200300400
- Boeing 747SR
- Boeing 747SP