AD 2020-23-01
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
Several occurrences of engine power fluctuations have been reported during ground tests on engines equipped with an affected part. The investigation results determined that one or more rubber cuff sealings of the cage reinforcement inside the main metering valve of the FCU was wrongly installed, which reduced the cuff ability to properly seal the FCU working pressure. This condition, if not corrected, may lead to engine surge, fluctuations, or loss of engine power, possibly resulting in loss of control of control of the aeroplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace the fuel control unit (FCU).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 flight hours (FHs) after the effective date of this AD for Group 1 engines, within 50 FHs or 60 days after the effective date of this AD for Group 2 engines, and within 100 FHs or 180 days after the effective date of this AD for Group 3 engines.
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Affected Aircraft
GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, M601F, H75-200, H80-100, H80-200, and H85-200 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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