AD 70-16-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R175/4-30-4/ | DOWTY ROTOL, LIMITED Models (c) R.175/4-30-4/13E, (c) R.193/4-30-4/50, and (c) R.209/4-40-4.5/2 Propellers |
| aircraft | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL, LIMITED Models (c) R.175/4-30-4/13E, (c) R.193/4-30-4/50, and (c) R.209/4-40-4.5/2 Propellers |
Unsafe Condition
Cracks in the fillet radius of the propeller operating pins at the junction between the pin diameter and flange.
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Required Actions
Inspect propeller operating pins for cracks in accordance with Dowty Rotol Service Bulletin No. 61-711, Revision 2 or equivalent. Replace cracked pins with new or inspected serviceable pins prior to returning the propeller to service. Re-inspect other fleet propellers of the same type within specified time intervals based on their time in service since new or last overhaul.
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Compliance Time
At the next propeller overhaul or upon the accumulation of a total time in service of 5,000 hours (for R.175/4-30-4/13E and R.193/4-30-4/50) or 4,000 hours (for R.209/4-40-4.5/2) since new or last overhaul, whichever occurs first. Repeat inspections at intervals not exceeding the same time thresholds since last inspection or overhaul.
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Affected Aircraft
Dowty Rotol, Limited propellers models (c) R.175/4-30-4/13E, (c) R.193/4-30-4/50, and (c) R.209/4-40-4.5/2 with specific operating pin part numbers installed on various aircraft including Fairchild Hiller F-27 series, Fokker F.27 Mark 400/600, and Nihon YS.11/YS.11A.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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