AD 2025-13-01
Effective 07/08/2025 · Published 06/23/2025
Airworthiness Directives; Bell Textron Canada Limited Helicopters
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…