AD 74-09-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T5309C | AVCO LYCOMING T5309C, T5311A and T5311B Engines. |
| engine | Honeywell International Inc. | T5311A | AVCO LYCOMING T5309C, T5311A and T5311B Engines. |
| engine | Honeywell International Inc. | T5311B | AVCO LYCOMING T5309C, T5311A and T5311B Engines. |
Unsafe Condition
Compressor disc or impeller assembly failures leading to partial or complete loss of engine power.
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Required Actions
Remove and replace the second, third, fourth, and fifth stage compressor rotor discs and centrifugal impeller assemblies with specified part numbers or later FAA approved P/Ns as per the table in the AD.
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Compliance Time
prior to the accumulation of 100 hours in service after the effective date of this AD
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Affected Aircraft
Avco Lycoming T5309C, T5311A, and T5311B turboshaft engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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