AD 99-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Short Brothers PLC | SD3-30 | Airworthiness Directives; Short Brothers Model SD3-30, SD3-60, SD3-SHERPA, and SD3-60 SHERPA Series Airplanes |
| aircraft | Short Brothers PLC | SD3-60 | Airworthiness Directives; Short Brothers Model SD3-30, SD3-60, SD3-SHERPA, and SD3-60 SHERPA Series Airplanes |
| aircraft | Short Brothers PLC | SD3-60 SHERPA | Airworthiness Directives; Short Brothers Model SD3-30, SD3-60, SD3-SHERPA, and SD3-60 SHERPA Series Airplanes |
| aircraft | Short Brothers PLC | SD3-SHERPA | Airworthiness Directives; Short Brothers Model SD3-30, SD3-60, SD3-SHERPA, and SD3-60 SHERPA Series Airplanes |
Unsafe Condition
Failure of the engine mounting tube assembly, which could result in loss of the engine in flight due to corrosion of the taper pins and internal surfaces of the engine mounting tubes and fittings.
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Required Actions
Perform a detailed visual inspection of the taper pins for corrosion within 9 months after the effective date. Perform a borescopic inspection of the internal surfaces of the engine mounting tubes and fittings for corrosion within 9 months. Replace corroded parts with new or serviceable parts prior to further flight if corrosion is found beyond specified limits.
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Compliance Time
Within 9 months after the effective date of this AD
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Affected Aircraft
Short Brothers Model SD3-30, SD3-60, SD3-SHERPA, and SD3-60 SHERPA series airplanes, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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