Airworthiness Directives; Textron Aviation Inc. Airplanes
Published Date: 7/14/2026
Rule
Summary
If you own or fly certain Textron Aviation Model 408 airplanes, heads up! The FAA now requires updated inspections for the horizontal and vertical stabilizer spars to catch cracks early. These changes kick in August 18, 2026, and mean updating your maintenance manuals and inspection plans—keeping your plane safe without breaking the bank.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 1 costs, 0 mixed.
Required Manual Update and Deadline
If you operate a Textron Model 408 airplane (serial numbers -0012 through -0051), the FAA requires you to revise the Airworthiness Limitations Section (ALS) of your aircraft maintenance manual (AMM) or instructions for continued airworthiness and your approved maintenance/inspection program. You must make this revision within 150 hours time-in-service or within 12 months after the AD’s effective date (August 18, 2026), whichever occurs first.
New Required Spar Inspection Interval
The AD requires detailed inspections of the horizontal and vertical stabilizer forward and aft spars at an interval of 1,600 flight hours for affected Model 408 airplanes (serial numbers -0012 through -0051). Guidance for accomplishing these inspections is in Textron Aviation Service Letter SL408-04-01, dated December 8, 2025.
Compliance Cost Estimate to Operators
The FAA estimates this AD affects 28 U.S.-registered Model 408 airplanes and that revising the ALS will take 1 work-hour at $85 per airplane (parts cost $0), costing $85 per product and $2,380 total for U.S. operators.
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