2026-15-06
FR doc 2026-15365AD 2026-15-06Published 2026-07-30Effective 2026-09-03
Supersedes 2024-02-55
Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.
Requires the inspection requirements of AD 2024-02- 55 and would limit the applicability to exclude certain serial numbered BTCL Model 505 helicopters with an improved design vertical stabilizer top end cap installed at production.
Full official abstract
The FAA is superseding Airworthiness Directive (AD) 2024-02- 55, which applies to certain Bell Textron Canada Limited (BTCL) Model 505 helicopters. AD 2024-02-55 required initial and recurring inspections of the vertical stabilizer top end cap assembly and corrective action if a crack is found. Since the FAA issued AD 2024-02- 55, the manufacturer introduced a new one- piece vertical stabilizer machined top end cap assembly, which is implemented during production, and designed a new replacement for the vertical stabilizer machined top end cap assembly currently in service. This AD continues to require the inspection requirements of AD 2024-02- 55 and would limit the applicability to exclude certain serial numbered BTCL Model 505 helicopters with an improved design vertical stabilizer top end cap installed at production. This AD also requires replacing the vertical stabilizer top end cap assembly with an improved design top end cap assembly, which constitutes a terminating action for the recurring detailed visual inspections. The FAA is issuing this AD to address the unsafe condition on these products.