AD 71-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Models 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Models 206A and 206B Helicopters |
Unsafe Condition
Corrosion and fatigue cracks in the main rotor blade spar lower surface adjacent to the tip inertia weight attachment screws.
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Required Actions
Inspect the lower surface of the main rotor blade from station 170 to 180 for paint blisters, raised areas, paint cracks, and exposed metal. If corrosion or cracks are found, remove and replace the blade or follow repair instructions. Perform repetitive inspections at intervals not exceeding 100 or 25 hours time in service depending on initial compliance.
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Compliance Time
Within 25 hours time in service from May 5, 1971 for blades with 600+ hours, or before reaching 625 hours for those with less than 600 hours. Repetitive inspections at intervals not more than 100 or 25 hours time in service.
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Affected Aircraft
Bell Helicopter Textron Canada Limited Models 206A and 206B equipped with main rotor blades P/N 206-010-200-29.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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