AD 2007-09-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc., Model 369, YOH-6A, 369A, OH-6A, 369H, 369HM, 369HS, 369HE, 369D, 369E, 369F, and 369FF Helicopters |
Unsafe Condition
Tail rotor blade root fitting failure due to a machining defect causing a sharp transition in the tapered end of the bore, which can lead to blade failure and subsequent loss of control of the helicopter.
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Required Actions
Remove each affected tail rotor blade assembly, inspect the bore of the tail rotor blade root fitting using a bright light, replace any blade assembly that does not have a smooth radius, and identify each airworthy tail rotor blade assembly with the applicable helicopter model.
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Compliance Time
Before further flight
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Affected Aircraft
MD Helicopters, Inc., Model 369, YOH-6A, 369A, OH-6A, 369H, 369HM, 369HS, 369HE, 369D, 369E, 369F, and 369FF helicopters, with tail rotor blade part numbers 369A1613, 369D21606, 369D21613, 369D21615, or 421-088 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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