AD 2011-19-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Dowty Propellers Type R212/4-30-4/22 and R251/4-30-4/49 Propeller Assemblies |
Unsafe Condition
Reports of cracks in the propeller hub port buttress threads of R212 and R251 propellers, affecting hubs with over 6,000 flight hours. This could lead to propeller blade separation, potentially causing damage to the airplane and/or injury to persons on the ground.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the buttress threads in the propeller hub and driving center assembly for cracks within 500 flight hours after the effective date, and repeat inspections at intervals not exceeding 500 flight hours. Use Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, and NDT Technique NDT 175U for the inspection. Remove the propeller assembly from service if a crack is found. Do not install the propeller unless the hub and driving center have passed the required inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 500 flight hours after the effective date
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dowty Propellers Type R212/4-30-4/22 propeller assemblies with hub and driving center assembly part numbers 601022105, 601022211, 601022294, 601021426, 601021858, or 601021859, and Type R251/4-30-4/49 propeller assemblies with hub and driving center assembly part numbers 660207202 or 660207203.
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.