AD 2012-18-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada | Airworthiness Directives; Bell Helicopter Textron Canada Helicopters |
| aircraft | Bell | Helicopter Textron Canada | Airworthiness Directives; Bell Helicopter Textron Canada Helicopters |
Unsafe Condition
An incorrect torque value of the tailboom attachment bolt specified in the BHTC Model 407 Maintenance Manual and applied during manufacturing, which exceeds the torque range recommended for the bolts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the tailboom-attachment hardware, including bolts, washers, and nuts, as specified in the BHTC Alert Service Bulletin No. 407-10-93, Revision A. Perform initial and recurring determinations of the torque on the nuts of the tailboom-attachment bolts at all four attachment locations.
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Compliance Time
Within 90 days or at the next scheduled 600-hour inspection, whichever comes first, for helicopters with 7000 hours or less time-in-service (TIS). For helicopters with more than 7000 hours TIS, within 150 hours TIS or 90 days, whichever comes first.
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Affected Aircraft
Bell Helicopter Textron Canada Limited (BHTC) Model 407 helicopters, serial numbers 53000 through 53990, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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