AD 2025-25-01
Effective 01/16/2026 · Published 12/12/2025
Airworthiness Directives; Bell Textron Canada Limited Helicopters
Summary
The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (Bell) Model 427 helicopters. This AD was prompted by a report of a cracked transmission oil check valve (check valve). This AD requires inspecting and measuring certain check valves and, depending on the results, repetitively inspecting and removing the check valve from service if it has leaks or is cracked. This AD also…