AD 2022-14-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | WALTER Engines a.s. | Various | Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines |
| aircraft | Aviat | Various | Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines |
Unsafe Condition
The life limit for the propeller shaft P/N M601-6081.6 is not published in the airworthiness limitations section (ALS) of the applicable GEAC M601 Engine Shop Manual. Additionally, some data, which can be used to determine the accumulated life of certain propeller shafts, may have not been provided to operators, so the propeller shaft life limit may not have been implemented correctly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Calculate the accumulated life of the propeller shaft and, depending on the number of accumulated flight hours, remove and replace the propeller shaft with a part eligible for installation. For M601F model turboprop engines, remove and replace the propeller shaft before the propeller shaft accumulates 12,000 flight hours since first installation on an engine, or before accumulating 350 flight hours after the effective date of this AD, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before the propeller shaft accumulates 12,000 flight hours since first installation on an engine, or before accumulating 350 flight hours after the effective date of this AD, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, and M601F model turboprop engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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