Airworthiness Directive · Amendment 39-23255 · Vertical stabilizer structure
Textron Aviation, Inc. (Type Certificate Previously Held by Cessna Aircraft Company) Airplanes
This AD applies to all Textron Aviation, Inc. (Type Certificate previously held by Cessna Aircraft Company) Model 525B airplanes, certificated in any category.
The FAA is correcting an airworthiness directive (AD) that was published in the Federal Register. That AD applies to all Textron Aviation, Inc., Model 525B airplanes. As published, there was an error in Table 1 to paragraph (g) of the AD. This document corrects that error. In all other respects, the original document remains the same.
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.
| 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.
After the action required by paragraph (g) of this AD has been done, no alternative actions and associated thresholds and intervals are allowed unless they are approved as specified in the provisions of paragraph (i) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
