Structural Repair

Boeing 747-400SF Cargo Door Compliance Repair

A compliance engineering solution for an Eastern European operator's Boeing 747-400SF, resolving an unapproved insulation material found during a major cargo door repair validation.

EASA — European Aviation Safety Agency
EASA Approved Design Organisation Approval No. EASA.21J.783
Top MRO in Europe 2022 award
Top MRO in Europe 2022 Awarded by Aerospace & Defense Review
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Reference
24098
Category
Structural Repair
Aircraft
Boeing 747-400SF
Status
Compliance Achieved
Year
2025

During a major repair validation of a Boeing 747-400SF main cargo door, Pt21 Solutions identified an unapproved insulation material. Our team designed a concurrent minor modification restoring the door to its original, OEM-approved specification.

The solution is fully compliant with EASA CS-25, restoring airworthiness without materially affecting aircraft weight, structural integrity or the operational schedule.

Scope of Work

  • Major repair validation of the main cargo door
  • Identification of non-conforming insulation material
  • Concurrent minor modification to restore OEM specification
  • EASA CS-25 compliance substantiation

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