AD 88-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Sundstrand | 14SF- 5 | HAMILTON STANDARD Models 14SF-5 and 14SF-7 Propellers |
| aircraft | Hamilton Sundstrand | 14SF- 7 | HAMILTON STANDARD Models 14SF-5 and 14SF-7 Propellers |
Unsafe Condition
Loss of the plastic 'Rynite' blade retaining rings, P/N 785540, and severe damage to the blade retention system with resultant propeller unbalance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time in service after May 21, 1987, and thereafter every 200 hours time in service until paragraph (c) is done, inspect the retaining rings per ASB 14SF-61-A21 Rev 2. If cracks are found, remove and replace the retaining ring halves or do paragraph (c) before flight. By July 31, 1989, replace all plastic rings with aluminum P/N 794345 per SB 14SF-61-17 Rev 1.
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Compliance Time
Within the next 50 hours time in service after May 21, 1987, and thereafter at intervals not to exceed 200 hours time in service, until accomplishment of paragraph (c). Replace by July 31, 1989.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hamilton Standard Model 14SF-5 and 14SF-7 propellers with plastic 'Rynite' retaining rings P/N 785540, installed on Dehavilland Dash 8 and Aerospatiale/Aeritalia ATR-42 aircraft.
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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