AD 97-25-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT7-5A2 | Airworthiness Directives; GE Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-7A | Airworthiness Directives; GE Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9B | Airworthiness Directives; GE Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9C | Airworthiness Directives; GE Aircraft Engines CT7 Series Turboprop Engines |
Unsafe Condition
Stage 1 or 2 gas generator turbine (GGT) disk failure caused by cracks in disk cooling holes due to machining damage during manufacturing, which could result in an uncontained engine failure and damage to the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time eddy current inspection (ECI) for cracks in disk holes of stage 1 and 2 GGT disks, and replace with serviceable parts if necessary. The inspection must be done at the next GGT module removal or within 3 months after the AD's effective date, whichever comes first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next GGT module removal or not to exceed 3 months after the effective date of this AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
GE Aircraft Engines Models CT7-5A2, -7A, -9B, -9C turboprop engines installed on CASA CN-235 series and SAAB-SCANIA SF340 series aircraft.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.