AD 66-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R130/4-20-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R148/4-20-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R175/4-30-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R179/4-20-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R184/4-30-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R186/4-30-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
| aircraft | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers |
Unsafe Condition
Failures of the bond between the deicing boots and the propeller blade's surface
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Apply preprimer Cellon SL4853/4854 or FAA-approved equivalent to the propeller blade surfaces before other primers, in accordance with Dowty Rotol Service Bulletin No. 61-157 (Modification No. (c) VP.1941) Revision 2 or later ARB-approved revision.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at the next replacement of deicer boots after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dowty Propellers models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and (c) R179/4-20-4/33 with blade serial numbers below A.105040 installed on specified aircraft models
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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