AD 97-21-01 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MT-Propeller Entwicklung GmbH | MTV-3 | MT-PROPELLER ENTWICKLUNG GMBH Model MTV-3-B-C/L250-21 Propellers |
Unsafe Condition
Propeller hub cracks could result in propeller blade separation and possible loss of control of the airplane.
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Required Actions
Perform an initial dye penetrant or eddy current inspection of the propeller hub within 50 hours time-in-service after the effective date. If cracks are found, replace the hub before further flight. Subsequent inspections must be done at intervals not exceeding 50 hours or 6 months for P/N B-050 hubs, and 200 hours or 12 months for P/N A-909-A hubs. Rework B-050 hubs by chamfering the bore and marking with SB12C stamp.
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Compliance Time
Within 50 hours time-in-service after the effective date
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Affected Aircraft
MT-Propeller Entwicklung GmbH Model MTV-3-B-C/L250-21 propellers installed on Sukhoi 29 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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