AD 81-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard Division | 24PF-303 | HAMILTON STANDARD Model 24PF Propellers |
| aircraft | Hamilton Standard Division | 24PF-304 | HAMILTON STANDARD Model 24PF Propellers |
| aircraft | Hamilton Standard Division | 24PF-305 | HAMILTON STANDARD Model 24PF Propellers |
| aircraft | Hamilton Standard Division | 24PF-306 | HAMILTON STANDARD Model 24PF Propellers |
| aircraft | Hamilton Standard Division | 24PF-309 | HAMILTON STANDARD Model 24PF Propellers |
| aircraft | Hamilton Standard Division | 24PF-310 | HAMILTON STANDARD Model 24PF Propellers |
Unsafe Condition
Spalling in the bearing raceway surfaces of the barrel and blade split races can lead to propeller failure.
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Required Actions
Visually inspect propellers in accordance with Hamilton Standard Service Bulletin HS Code 24PF No. 17, Revision 2 or equivalent. Replace spalled barrels or split races prior to further flight as per the service bulletin. Report inspection results to the FAA Great Lakes Region.
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Compliance Time
Within the next 100 hours time in service after the effective date (June 15, 1981) for propellers with 2,900 hours or more time in service since new, or prior to 3,000 hours time in service for those with less. Recurring inspections not to exceed 1,500 hours time in service from the last inspection. Adjustments may be requested through an FAA inspector.
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Affected Aircraft
Hamilton Standard Division Model 24PF propellers with air-melt barrels (Part Number 772531-1) installed on DeHavilland DHC-7 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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