Airworthiness directives › 2026-03-06
AD 2026-03-06 Airworthiness Directives; Textron Aviation, Inc. (Type Certificate Previously Held by Cessna Aircraft Company) Airplanes
Makes named: textron aviation, cessna. Models named: 525B. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Textron Aviation, Inc. (Type Certificate previously held by Cessna Aircraft Company) Model 525B airplanes, 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 (TIS) 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 (ICA) 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 525B Airworthiness Limitation Tasks Task No. Task title Existing task interval Revised task interval Inspection document Zone 54-50-00-250 Forward Engine Mount Channel Flange (Eddy Current) Special Detailed Inspection 6,000 hours TIS 6,100 hours TIS, then 4,100 hours TIS thereafter 4-12-NA 411, 412 54-50-00-252 Aft Engine Beam Aft Upper Angle Common to Aft Web, BL 24.50 (Eddy Current) Special Detailed Inspection 11,500 hours TIS 14,100 hours TIS, then every 2,700 hours TIS thereafter 4-12-MR 311, 312 54-50-00-254 Forward Engine Mount Aft Channel Web (Eddy Current) Special Detailed Inspection 12,000 hours TIS 16,300 hours TIS, then every 11,600 hours TIS thereafter 4-12-MS 410, 420 54-50-00-255 Forward Engine Mount Forward Channel Web (Eddy Current) Special Detailed Inspection 12,000 hours TIS 15,600 hours TIS, then every 11,100 hours TIS thereafter 4-12-NB 410, 420 55-40-00-250 Vertical Fin Left and Right Front Spar Cap at Attachment Hole #2 (Eddy Current) Special Detailed Inspection 9,000 hours TIS, then every 7,500 hours TIS thereafter 9,000 hours TIS, then every 7,000 hours TIS thereafter 4-12-ML 340 55-40-00-251 Vertical Fin Left and Right Front Spar Cap at Attachment Hole #1 (Eddy Current) Special Detailed Inspection 15,000 hours TIS 17,700 hours TIS, then every 14,900 hours TIS thereafter 4-12-MO 340 55-40-00-252 Vertical Fin Left and Right Rear Spar Cap at Attachment Hole #1 (Eddy Current) Special Detailed Inspection 15,000 hours TIS, then every 14,500 hours TIS thereafter 23,600 hours TIS, then every 12,100 hours TIS thereafter 4-12-MQ 340 Note 1 to paragraph (g): Additional guidance for accomplishing the actions required by this AD can be found in Textron Aviation Service Letter SL525B-05-04, Revision 1, dated January 7, 2025.
Unsafe condition
This AD was prompted by the manufacturer's revision of the aircraft maintenance manual (AMM) to introduce more restrictive inspection intervals. The FAA is issuing this AD to prevent undetected cracks in the engine mount and vertical stabilizer front and rear spar caps. The unsafe condition, if not addressed, could result in reduced structural integrity and consequent reduced controllability 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