AD 81-07-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | CR 289/3-110-F/1 | DOWTY ROTOL Models (c)R.289/3-110- F/1 and (c)R.289/3-110-F/11 Propellers |
| aircraft | Dowty Propellers | CR 289/3-110-F/11 | DOWTY ROTOL Models (c)R.289/3-110- F/1 and (c)R.289/3-110-F/11 Propellers |
Unsafe Condition
Blade tip failures due to cyclic bending stresses from improper indexing of the propeller shaft to the engine crankshaft.
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Required Actions
Reindex propeller shaft to engine crankshaft per Dowty Rotol Service Bulletin No. 61-941 and PZL-Rzeszow Service Instruction No. 28/PZL-3S/81. Replace blades P/N 660705335 operated prior to reindexing with new blades of the same part number. Establish a 600-hour safe life limit on new blades installed.
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Compliance Time
Within the next 50 hours time in service after the effective date of this AD or by April 30, 1981, whichever occurs first
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Affected Aircraft
Dowty Propellers models (c)R.289/3-110-F/1 and (c)R.289/3-110-F/11 propellers installed on WSK-Pezetel Model PZL-3S engine used on Gulfstream American G-164A, B, C airplanes modified by STC SA2731SW, and Ayres S2R-R3S and S2R airplanes modified by STC SA3897WE.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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