AD 2007-08-04
Unsafe Condition
Stress conditions affecting the fatigue life and damage tolerance of McCauley Propeller Systems models 3A32C406/82NDB-X and D3A32C409/82NDB-X propellers, when installed on Teledyne Continental Motors (TCM) IO-520, TSIO-520, or IO-550 reciprocating engines, could result in blade or hub failure and separation of a propeller blade, leading to loss of control of the airplane.
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Required Actions
Add an operational RPM restriction on the C406 and C409 propellers, install an RPM restriction placard in the cockpit, add a 10,000-hour total time-in-service (TIS) life limit, remove from service any propeller with 10,000 hours or more TIS or with unknown TIS, and perform initial and repetitive propeller blade inspections for damage, repairing if necessary.
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Compliance Time
Within 12 months of the effective date (May 17, 2007)
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Affected Aircraft
McCauley Propeller Systems models 3A32C406/82NDB-X and D3A32C409/82NDB-X propellers installed on Teledyne Continental Motors (TCM) IO-520, TSIO-520, or IO-550 reciprocating engines, including Beech 35-A33 and 35-B33 aircraft models.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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