AD 2012-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Limited | Airworthiness Directives; Bell Helicopter Textron Canada Limited Helicopters |
| aircraft | Bell | Helicopter Textron Canada Limited | Airworthiness Directives; Bell Helicopter Textron Canada Limited Helicopters |
Unsafe Condition
An over-torque of the tailboom attachment bolt (bolt). This condition could result in bolt failure, loss of the tailboom, and subsequent loss of control of the helicopter.
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Required Actions
Replace the tailboom attachment hardware within 150 hours time-in-service (TIS) or 90 days, whichever occurs first. Remove the left upper bolt, washers, and nut, then install new hardware as specified. Measure the existing tare torque and ensure it meets the minimum value of 14 inch/lbs. Torque the nut and coat the bolt head, nut, and washers with corrosion preventive compound. Repeat these actions at the remaining bolt locations. After installation, determine the torque of each nut at intervals not exceeding 300 hours TIS.
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Compliance Time
Within 150 hours time-in-service (TIS) or 90 days, whichever occurs first.
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Affected Aircraft
Bell Helicopter Textron Canada Limited Model 427 helicopters, serial numbers 56001 through 56084, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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