AD 99-25-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 500N | Airworthiness Directives; MD Helicopters Inc. Model 500N and 600N Helicopters |
| aircraft | MD Helicopters, Inc. | 600N | Airworthiness Directives; MD Helicopters Inc. Model 500N and 600N Helicopters |
Unsafe Condition
Stress corrosion cracks in the thruster control cable conduit cap at the telescopic swivel end and relieved area could cause failure of the cap, leading to a fixed thruster condition and subsequent loss of normal anti-torque directional control.
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Required Actions
Inspect the thruster control cable conduit cap at the telescopic swivel end within 5 hours time-in-service or before further flight after December 31, 1999. Inspect the cap at the relieved area within 100 hours time-in-service or before further flight after February 19, 2000. Replace unairworthy thruster cables if unacceptable cracks are found.
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Compliance Time
Within 5 hours time-in-service or before further flight after December 31, 1999 (first inspection); within 100 hours time-in-service or before further flight after February 19, 2000 (second inspection)
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Affected Aircraft
MD Helicopters Inc. Model 500N (serial numbers LN001-LN099) and Model 600N (serial numbers RN003-RN074) helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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