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CF-2025-21 : Main Rotor – Expandable Blade Bolt incorrect heat treatment

Number CF-2025-21
Issued by Canada  Canada
Issue date 2025-05-05
Effective date 2025-05-06
EASA approval number
ATA Chapter 62
Approval Holder
/ Type Designation
  • BELL TEXTRON CANADA LTD (BTCL)
    • 407
    • 427
Revision Not applicable
Correction Not applicable
Supersedure None
Publication(s) and related information BTCL Alert Service Bulletin (ASB) 407-24-137 initial release, dated 17 July 2024, or later revisions approved by Chief, Continuing Airworthiness, Transport Canada. BTCL Alert Service Bulletin (ASB) 427-24-47 initial release, dated 7 August 2024, or later revisions approved by Chief, Continuing Airworthiness, Transport Canada.
Remarks Comments regarding this AD should be referred to the Safety Information Section, Certification Directorate, EASA;
E-mail: ADs [at] easa.europa [dot] eu