AD 99-22-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 407 | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 Helicopters |
Unsafe Condition
Fin assemblies with reduced skin thickness, indicated by notches, scratches, or grooves on the skin, which could lead to failure of the vertical fin and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the fin assembly for reduced skin thickness per Bell Helicopter Textron Alert Service Bulletin 407-98-17, Rev A. Repair or replace the fin if notches, scratches, or grooves are found. Identify inspected or repaired fins per the service bulletin.
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Compliance Time
Within 100 hours time-in-service
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Affected Aircraft
Bell Helicopter Textron Canada Model 407 helicopters with vertical fin assembly part numbers 206-020-113-223A, -223B, or -223S, serial numbers prefixed 'BP' up to 2266 (excluding BP2260, BP2262, BP2265).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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