Airworthiness directives › 2026-14-10
AD 2026-14-10 Airworthiness Directives; Textron Aviation Inc. Airplanes
Makes named: textron aviation. Models named: 408. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Textron Aviation Inc. Model 408 airplanes, serial numbers -0012 through -0051, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 150 hours time-in-service or 12 months after the effective date of this AD, whichever occurs first: Revise the ALS of the existing AMM or instructions for continued airworthiness and the existing approved maintenance or inspection program, as applicable, by incorporating the information identified in table 1 to paragraph (g) of this AD. Table 1 to Paragraph ( g )—Revised Model 408 Airworthiness Limitation Tasks Task number Task title Interval Inspection document Zone Serial effectivity 55-10-00-221 Horizontal Stabilizer Spar Detailed Inspection 1600 flight hours 4-12-MB 351, 352 -0012 through -0040. 55-30-00-221 Vertical Stabilizer Spar Detailed Inspection 1600 flight hours 4-12-MB 341, 342, 343 -0012 through -0051. Note 1 to paragraph (g): Additional guidance for accomplishing the actions required by this AD can be found in Textron Aviation Inc. Service Letter SL408-04-01, dated December 8, 2025.
Unsafe condition
This AD was prompted by the manufacturer's revision of the aircraft maintenance manual (AMM) to introduce a detailed inspection for the horizontal stabilizer spar, and a change to the airplane serial effectivity for the vertical stabilizer spar detailed inspection. The FAA is issuing this AD to detect and address cracks in the horizontal and vertical stabilizers forward and aft spars. The unsafe condition, if not addressed, could result in reduced structural integrity of the airplane or reduced controllability of the airplane with possible loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1