AD 77-09-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R175/4-30-4/ | DOWTY ROTOL Models (c)R175/4-30-4/13E and (c)R212/4-30-4/22 Propellers |
| aircraft | Dowty Propellers | (c) R212/4-30-4/ | DOWTY ROTOL Models (c)R175/4-30-4/13E and (c)R212/4-30-4/22 Propellers |
Unsafe Condition
Cracking and possible failure of the hub driving center due to improper machining.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the hub driving center to verify correct machining per Dowty Rotol Service Bulletin 61-857. If incorrectly machined, rework to salvage scheme No. 640144020. Equivalent methods require approval by the Chief, Aircraft Certification Staff, FAA.
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Compliance Time
At the next propeller overhaul or within the next 4700 hours propeller time in service after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Dowty Propellers models (c)R175/4-30-4/13E and (c)R212/4-30-4/22 propellers with hub and driving center P/N 601023166, 601023223, or 601023227 modified to Mod. No. (c)VP2381 standard.
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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