AD 2022-18-02
Unsafe Condition
The improper surface finish on a propeller blade lag screw results in reduced fatigue strength of the propeller blade lag screw, which could lead to in-flight blade detachment, damage to the airplane, and reduced control of the airplane.
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Required Actions
Replace the propeller blade lag screw with part number (P/N) A-983-C-85 with a part eligible for installation. For turboprop engines, replace the propeller blade lag screw within 120 days from the effective date of this AD or before exceeding 50 flight hours (FHs) from the effective date of this AD, whichever occurs first. For piston engines, replace the propeller blade lag screw within 60 days from the effective date of this AD or before exceeding 25 FHs from the effective date of this AD, whichever occurs first.
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Compliance Time
Within 120 days from the effective date of this AD or before exceeding 50 flight hours (FHs) from the effective date of this AD, whichever occurs first, for turboprop engines. Within 60 days from the effective date of this AD or before exceeding 25 FHs from the effective date of this AD, whichever occurs first, for piston engines.
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Affected Aircraft
MT-Propeller Entwicklung GmbH MTV-5-1-( ), MTV-9-( ), MTV-11-( ), MTV-12-( ), MTV-14-B, MTV-14-D, MTV-15-( ), MTV-16-( ), MTV-17-( ), MTV-18-( ), MTV-20-( ), and MTV-27-( ) variable pitch propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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