AD 99-13-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; MD Helicopters, Inc (MDHI) Model 369D and E Helicopters |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives; MD Helicopters, Inc (MDHI) Model 369D and E Helicopters |
Unsafe Condition
Failure of the four-bladed tail rotor fork assembly (P/N 369D21701-21) due to incorrectly machined ridges on the arms after shot-peening, which could cause loss of a tail rotor blade and subsequent loss of control.
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Required Actions
Inspect fork assemblies for ridges on the arms before further flight. If no ridges are present, conduct dye-penetrant and visual inspections for cracks. Replace cracked assemblies with airworthy forks. Perform repetitive inspections every 50 hours time-in-service for unridged forks, removing and replacing unairworthy assemblies before flight.
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Compliance Time
Before further flight
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Affected Aircraft
MD Helicopters, Inc. Model 369D and E helicopters with fork assembly P/N 369D21701-21 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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