AD 66-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R179/4-20-4/ | DOWTY ROTOL Models (c) R.193/4-30-4/50, (c) R.184/4- 30-4/50, and (c) R.179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R184/4-30-4/ | DOWTY ROTOL Models (c) R.193/4-30-4/50, (c) R.184/4- 30-4/50, and (c) R.179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL Models (c) R.193/4-30-4/50, (c) R.184/4- 30-4/50, and (c) R.179/4-20-4/33 Propellers |
Unsafe Condition
Improper operation of the propeller pitch lock under high oil temperature conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework the existing Lock Support Sleeve, Dowty Rotol P/N RA.61236, in accordance with Dowty Rotol Service Bulletin No. 61-185 or later ARB-approved revision.
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Compliance Time
within the next 200 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Dowty Rotol Propellers models (c) R.193/4-30-4/50 installed on Fairchild F-27; (c) R.184/4-30-4/50 installed on Grumman G-159; and (c) R.179/4-20-4/33 installed on Viscount 810.
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
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