AD 73-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
Unsafe Condition
Fatigue cracks in the vertical fin support forgings in the area of the fin attachment nut plates could result in structural failure of the vertical fin support system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the vertical fin, remove paint in the area of the fin attachment nut plates, inspect for cracks using dye penetrant or equivalent method, replace cracked forgings prior to further flight, remove thread marks in holes per Service Bulletin 206-01-73-5, and reinstall the fin. If support forgings were replaced per Service Bulletin 206-01-73-5 Part II, this AD is not applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours' time in service after the effective date of this A.D.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Model 206A and 206B helicopters, serial numbers 4 through 1097, equipped with vertical fin support forgings P/N 206-031-417 and -418.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.