AD 78-16-02 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R.209/4-40-4.5 | DOWTY ROTOL LTD Model R.209/4-40-4.5/2 Propellers |
Unsafe Condition
Propeller hub failure due to cracks in the hub arm threads and subsequent loss of propeller blade retention.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the propeller hub blade bearing retaining threads for cracks in accordance with Service Bulletin 61-890. Replace the hub with a serviceable hub of the same part number if cracking is found. Handle defective hubs per paragraph 1.C(4) of the Service Bulletin. Inspect all affected propellers within 1,000 flight cycles if cracking is detected, and thereafter at intervals not exceeding 3,000 flight cycles.
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Compliance Time
Within the next 1,000 flight cycles after the effective date of this AD or at a time not to exceed 3,000 flight cycles since the previous inspection, whichever occurs first.
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Affected Aircraft
Dowty Rotol Model R.209/4-40-4.5/2 propellers installed on Nihon Model YS-11 and YS-11A airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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