AD 2012-25387
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. |
Unsafe Condition
A crack in the main rotor lower hub assembly (lower hub). This condition could result in failure of the lower hub and subsequent loss of control of the helicopter.
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Required Actions
Visually inspect the lower hub for a crack within 100 hours time-in-service (TIS) or during the next annual inspection, whichever occurs first. If a crack is found, replace the lower hub with an airworthy one before further flight. If no crack is found, perform an eddy current inspection by a certified technician. Replace the lower hub with an airworthy one within 3 years.
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Compliance Time
Within 100 hours time-in-service (TIS) or during the next annual inspection, whichever occurs first, for initial inspections. Recurring inspections must be done at intervals not to exceed 300 hours TIS or during the next annual inspection, whichever occurs first. Replacement of the lower hub must be completed within 3 years.
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Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters with main rotor lower hub assembly (lower hub) part number 900R2101008-107, with serial numbers beginning with 5009, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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