AD 79-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; Hughes Model 369D Helicopters |
Unsafe Condition
Failure of the tail rotor pitch control assembly, which could result in loss of tail rotor control.
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Required Actions
Check the locknut and tang washer of the tail rotor pitch control assembly before further flight. If loose, replace the assembly with a serviceable one having a white dot on the locknut. Repeat checks before each engine start-up until termination action per DN-37. Operators complying with DN-37 must replace assemblies within 150 hours time in service or accomplish DN-37 within 100 hours depending on prior repair status.
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Compliance Time
Before further flight after the effective date of this AD
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Affected Aircraft
Hughes Model 369D Helicopters except Serial Numbers 0409 and subsequent
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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