AD 2004-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. (MDHI) Model 500N and 600N Helicopters |
Unsafe Condition
Failure of the forward thruster cable assembly due to stress corrosion, specifically corrosion pitting or cracking in the connector of the forward and center thruster control cable assembly.
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Required Actions
Inspect each forward and center thruster control cable assembly connector using a bright light and a 10x or higher magnifying glass for corrosion pitting or cracking. If corrosion pitting or cracking is found, replace the cable assembly with an airworthy cable assembly before further flight.
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Compliance Time
Within the next 10 hours time-in-service or 30 days, whichever comes first.
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Affected Aircraft
MD Helicopters, Inc. Model 500N helicopters with serial numbers prefixed 'LN' and ranging from 001 to 099, and Model 600N helicopters with serial numbers prefixed 'RN' and ranging from 003 to 068, equipped with forward thruster cable assembly part number 500N7201-55 and center cable assembly part numbers 500N7201-57 or 500N7201-59.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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