AD 74-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R.209/4-40-4.5 | DOWTY ROTOL Models (c)R 209/4-40-4.5/2, (c)R 245/4-40-4.5/13, and (c)R 259/4-40- 4.5/17 Propellers |
| aircraft | Dowty Propellers | (c) R.245/4-40-4.5 | DOWTY ROTOL Models (c)R 209/4-40-4.5/2, (c)R 245/4-40-4.5/13, and (c)R 259/4-40- 4.5/17 Propellers |
| aircraft | Dowty Propellers | (c) R.259/4-40-4.5 | DOWTY ROTOL Models (c)R 209/4-40-4.5/2, (c)R 245/4-40-4.5/13, and (c)R 259/4-40- 4.5/17 Propellers |
Unsafe Condition
Cracking of full width case hardened rollers in the bottom (C.F.) race of the propeller blade bearings may result in propeller failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace sets of rollers specified in the AD in accordance with Dowty Rotol Service Bulletins 61-542-8/9, using new parts of the same part number or through hardened rollers with specified modifications. Inspect for broken rollers and preload at each replacement; if 10+ broken rollers or preload <0.0035 inches, remove associated components from service and replace with serviceable parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight after each report of significant propeller induced vibration, or within the next 600 hours' time in service after the AD's effective date or before 2,000 hours' time in service on the rollers, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dowty Propellers models (c)R 209/4-40-4.5/2, (c)R 245/4-40-4.5/13, and (c)R 259/4-40-4.5/17 installed on Nihon YS-11/YS-11A and Convair 600/640 series with Rolls-Royce Dart 542 engines.
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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