AD 2026-15-05 Airworthiness Directives; Textron Aviation Inc. Airplanes

Makes named: textron aviation. Models named: B300, B300C. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Textron Aviation Inc. Model B300 and B300C airplanes, certificated in any category, identified in Textron Mandatory Service Letter MTL-57-04, Revision 1, dated March 27, 2025, including airplanes identified in paragraphs (c)(1) through (3) of this AD, except for any airplane that has had a wing evaluation performed by Textron Aviation Special Missions and been issued a serial number specific aircraft limitations manual and structural inspection and repair manual supplements. (1) Model B300 airplanes (heavy weight) having Kit 130-4402 installed (effective for serial numbers (S/Ns) FL-91, FL-381, FL-383, FL-387, FL-391 and on). (2) Model B300 (heavy weight) and B300C (non-extended range) airplanes having Kit 130-4030 installed (effective for S/Ns FL-381, FL-383 and on, and FM-12 and on). (3) Model B300 (increased gross weight with extended-range fuel tank) airplanes having Kit 130-4014 (effective for S/Ns FL-1 and on and FM-1 and on).

Comply with this AD within the compliance times specified, unless already done.

At the applicable compliance time specified in paragraphs (g)(1) through (3) of this AD, revise the Limitations Section of the existing aircraft maintenance manual or instructions for continued airworthiness and the existing maintenance or inspection program, as applicable, by incorporating the information identified in table 1 to paragraph (g) of this AD. (1) For airplanes that are certified to or operating at 16,500 lb. MTOW and with 3,800 hours total time-in-service (TTIS) or less: Before accumulating 3,800 hours TTIS or within 25 hours time-in-service (TIS) or 30 days after the effective date of this AD, whichever occurs later. (2) For airplanes that are certified to or operating at 16,500 lb. MTOW and with between 3,801 and 7,400 TTIS: Within 200 hours TIS or 6 months, whichever occurs first after the effective date of this AD. (3) For airplanes that are certified to or operating at 16,500 lb. MTOW and with more than 7,401 hours TTIS: Within 25 hours TIS or 30 days, whichever occurs first after the effective date of this AD. Table 1 to Paragraph ( g )—Revised Scheduled Component Replacement Time Limits Task No. Component Interval 57-00-00-9602 Wing to Fuselage Attach Angles (FL-1 through FL-175, FL-177; FM-1 through FM-9; unless Kit 101-1202-0001 is installed) 16,500 MTOW airplanes, replace every 2,500 hours. 57-00-00-9603 Wing to Fuselage Attach Angles (FL-176, FL-178 and after; FM-10 and after; and prior airplanes with Kit 101-1202-0001 installed) 16,500 MTOW airplanes, replace every 29,200 hours. 57-20-01-9600 Outboard Wing Structure (FL-1 through FL-125; FM-1 through FM-8; unless 101-110085-1 and -2 spar caps are installed) 16,500 MTOW airplanes, replace every 6,500 hours. There are no life limitation inspection tasks associated with the wing center section Wing Center Section (FL-126 and after; FM-9 and after; and prior airplanes with Kit 101-1200-0001 installed) The life is not limited provided the inspection programs defined in the listed maintenance manuals and the replacement schedule for the items listed below have been adhered to for continued airworthiness. King Air Series Structural Inspection and Repair Manual, P/N 98-39006, Revision D6. • Chapter 57-18-02 Super King Air Model B300/B300C Maintenance Manual, P/N 130-590031-11. • Chapter 5 • Chapter 57 Super King Air Model B300/B300C Fusion Maintenance Manual, P/N 434-590169-0009. • Chapter 5 • Chapter 57 There are no life limitation inspection tasks associated with the outboard wing structure. Outboard Wing Structure (FL-126 and after; FM-9 and after; and prior airplanes with 101-110085-1 and -2 spar caps installed) The life is not limited provided the inspection programs defined in the listed maintenance manuals and the replacement schedule for the items listed below have been adhered to for continued airworthiness. King Air Series Structural Inspection and Repair Manual, P/N 98-39006, Revision D6. • Chapter 57-18-02 Super King Air Model B300/B300C Maintenance Manual, P/N 130-590031-11. • Chapter 5 • Chapter 57 Super King Air Model B300/B300C Fusion Maintenance Manual, P/N 434-590169-0009. • Chapter 5 • Chapter 57 Note 1 to paragraph (g): Additional guidance for accomplishing the actions required by this AD can be found in Textron Super King Air B300/B300C Airworthiness Limitations Manual 130-590031-211G, Revision G0, dated April 29, 2026.

This AD was prompted by the manufacturer's revision of the structural inspection and repair manual to introduce more restrictive inspection intervals for airplanes that are certified to or operating at a 16,500 pound (lb.) maximum takeoff weight (MTOW). The FAA is issuing this AD to prevent undetected cracks in the wing or wing supporting structure. The unsafe condition, if not addressed, could result in reduced structural integrity and consequent wing separation from the fuselage in flight.

None.