AD 2017-19-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric | Company | Airworthiness Directives; General Electric Company Turboshaft Engines |
Unsafe Condition
The high-pressure compressor (HPC) impeller installed on these engines may have suffered from material degradation during the manufacturing process.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the affected HPC impeller from service at the next engine shop visit after the effective date of this AD, or prior to accumulating 12,000 cycles since new for CT7-9B engines, or prior to accumulating 1,500 engine hours after the effective date for CT7-8A engines, whichever is earlier.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the compliance times specified in the AD (next engine shop visit or cycle/hour limits).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
General Electric Company CT7-8A and CT7-9B model turboshaft engines with HPC impeller part number 5123T51P02 and serial numbers GLHTPH9G, GLHTPP7P, or GLHTPJHN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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