AD 84-09-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Thrush Aircraft, Inc. | S2R-R1820 | Airworthiness Directives; Ayres Model S2R-R1820 Series Airplanes |
Unsafe Condition
Failure of the fuselage upper longerons due to cracks in specific areas including between the upper engine mount and first hopper attachment bracket, at vertical and diagonal tube intersections, and at hopper attachment brackets.
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Required Actions
Visually check the forward fuselage upper longerons for cracks before further flight and every 10 hours time-in-service. If cracks are found, install tubular split-sleeve modification (P/N CK-AG-19) on both upper longerons before further flight. Within 100 hours time-in-service after September 21, 1984, install the modification even if no cracks are found.
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Compliance Time
Before further flight and thereafter at intervals not to exceed ten (10) hours time-in-service; within one hundred (100) hours time-in-service after September 21, 1984.
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Affected Aircraft
Ayres Model S2R-R1820 (serial numbers R1820-001DC through R1820-031DC)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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