AD 76-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; BOEING VERTOL Model 107-11 Helicopters |
Unsafe Condition
Corrosion on main rotor blade spars (P/N's 107R1202 and SK24790 series) could lead to cracking.
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Required Actions
Inspect for corrosion and alter main rotor blades per Boeing Vertol Service Bulletins 107-333(R-1) or 107-334, or equivalent procedure. Replace blades if corrosion exceeds specified limits.
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Compliance Time
within the next 60 days unless already accomplished within the past 34 months and every 36 months thereafter
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Affected Aircraft
Boeing Vertol Model 107-11 Helicopters, all serial numbers certified in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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