AD 97-21-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | T58-GE-100 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | T58-GE-10 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | T58-GE-8F | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | T58-GE-5 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | T58-GE-3 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | CT58-110-1 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | CT58-110-2 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | CT58-140-1 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
| engine | General Electric Company | CT58-140-2 | Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines |
Unsafe Condition
Cooling plates forged with contaminated alloy could reduce the lives of the parts, leading to cooling plate fracture, which could result in a contained engine failure and an inflight engine shutdown.
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Required Actions
Remove from service affected cooling plates listed by serial number in GE CT58 SB No. 72-188, Revision 1, and replace with serviceable parts at the next part exposure or next light overhaul, whichever occurs first, but not to exceed 1,000 hours time in service for engines in RHL operations or 2,000 hours TIS for engines not in RHL operations.
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Compliance Time
at the next part exposure or next light overhaul, whichever occurs first, but not to exceed 1,000 hours time in service (TIS) for engines in RHL operations or 2,000 hours TIS for engines not in RHL operations
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Affected Aircraft
General Electric Company Models CT58-110-1, -110-2, -140-1, -140-2, and T58-GE-3/-5/-8F/-10/-100 series turboshaft engines with specific cooling plates installed.
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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