AD 2011-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Limited Model 427 | Airworthiness Directives; Bell Helicopter Textron Canada Limited Model 427 Helicopters |
| aircraft | Bell | Helicopter Textron Canada Limited Model 427 | Airworthiness Directives; Bell Helicopter Textron Canada Limited Model 427 Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Bell Helicopter Textron Canada Limited Model 427 Helicopters |
Unsafe Condition
Tail rotor driveshaft hanger bearing bracket part number (P/N) 427-044-223-101 has been found cracked due to fatigue. Fatigue cracking was initiated by a tooling mark left during manufacture. The existence of tooling marks on the bracket could lead to bracket failure, loss of tail rotor drive, and consequently, loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect both sides of the hanger bracket, P/N 427-044-223-101, for cracks. If no cracks are found, rework both sides of the bracket. If cracks are found, replace the hanger bracket with a new one that has been reworked. Ensure replacement brackets are inspected and reworked before installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after April 14, 2011, for specific serial numbers; before further flight for all affected helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Model 427 helicopters, all serial numbers, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.