AD 94-17-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT7-5A2 | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-5A3 | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-7A | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-7A1 | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9B | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9B1 | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9B2 | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9C | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
| engine | General Electric Company | CT7-9D | Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines |
Unsafe Condition
Failure of the propeller shaft due to a pipe inclusion defect positioned in a high stress location, which can initiate a crack leading to separation of the propeller from the propeller shaft and possible damage to the aircraft.
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Required Actions
Perform a one-time ultrasonic inspection of the propeller shaft flange outer diameter (OD) fillet radius and inner diameter (ID) bore for subsurface metallurgical defects, replace defective propeller shafts with serviceable parts, and conduct a borescope inspection to identify suspect propeller shafts. Actions must follow GEAE Service Bulletin A72-350, Revision 3.
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Compliance Time
at the next shop visit after the effective date of this AD, or prior to October 31, 1994, whichever occurs first
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Affected Aircraft
General Electric Aircraft Engines Models CT7-5A2, -5A3, -7A, -7A1, -9B, -9B1, -9B2, -9C, -9D turboprop engines with propeller gearboxes listed by serial number in GEAE Service Bulletin A72-350, Revision 3.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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