Summary
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.
Directive Details
AD Number
FAA-2025-1111
Document Number
2025-11449
Type
Rule
Publication Date
June 23, 2025
Effective Date
July 8, 2025
Affected Manufacturer
Bell Textron Canada Limited
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2025-1111
Topics
Official Documents
Automated AD compliance tracking
AeroCopilot matches ADs to your aircraft and tracks compliance status. Included in every plan from $7.99 monthly.
Unlock AD-to-aircraft matching, compliance tracking, recurrence schedule with a free AeroCopilot account.
Sign up free to unlock AD-to-aircraft matching, compliance tracking, recurrence scheduleFree forever · No credit card · Sourced directly from FAA & NOAA pipelines