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Airworthiness Directive

AD 2025-13-01 90 FR 26424 Active

Federal Aviation Administration · 14 CFR part 39

Requires removing the expandable blade bolts from service and replacing them with a part eligible for installation.

Federal Register (opens in a new tab)FAA DRS (opens in a new tab)

FR document
2025-11449
Amendment
39-23067
Published
2025-06-23
Effective
2025-07-08
Models covered
2

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/2025-13-01 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

2025-13-01

FR doc 2025-11449 · 90 FR 26424

AD 2025-13-01Published 2025-06-23Effective 2025-07-08

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires removing the expandable blade bolts from service and replacing them with a part eligible for installation.

Full official abstract

The FAA is adopting a new airworthiness directive (AD) for all Bell Textron Canada Limited (BTCL) Model 407 and 427 helicopters. This AD was prompted by a report that certain expandable blade bolts installed on the main rotor blade may not have received the correct heat treatment, which could result in stress corrosion cracking of the expandable blade bolts. This AD requires removing the expandable blade bolts from service and replacing them with a part eligible for installation. This AD also prohibits the installation of an affected expandable blade bolt on any helicopter. The FAA is issuing this AD to address the unsafe condition on these products.

More directives for Bell 407

  1. AD 2026-14-07 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2026-08-21
  2. AD 2026-10-04 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2026-06-25
  3. AD 2024-10-12 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2024-08-22
  4. AD 2023-17-51 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2023-09-21
  5. AD 2022-27-08 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2023-01-12

All Bell 407 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 2 models in our index