Citation SERVICE LETTER MANDATORY SL525B-05-04

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Citation SERVICE LETTER MANDATORY SL525B-05-04 REVISION TRANSMITTAL This sheet transmits Revision 1 to SL525B-05-04, which: A. Changes the Inspection Document from 4-12-MI to 4-12-NA in Table 3. NOTE: This revision replaces the original issue of SL525B-05-04. REVISION COMPLIANCE NO EFFECT. Airplanes previously modified by this service letter are not affected. LOG OF REVISIONS Original Issue December 10, 2024 Revision 1 January 7, 2025 Original Issue - December 10, 2024 SL525B-05-04 Revision 1 - January 7, 2025 Page 1 of 1 Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800 COPYRIGHT © 2024 Citation SERVICE LETTER MANDATORY SL525B-05-04 TITLE TIME LIMITS/MAINTENANCE CHECKS - SCHEDULED MAINTENANCE PROGRAM CHANGE EFFECTIVITY MODEL SERIAL NUMBERS 525B (CJ3) -0001 thru -0056, -0058 thru -0415 525B (CJ3+) -0057, -0451 thru -0729 REASON The Model 525B Maintenance Manual Revision 27, Chapter 4, Revision 8 Airworthiness Limitation changes the inspection intervals for the Chapter 54 - Nacelle/Pylons and Chapter 55 - Stabilizer locations. To assure the continued airworthiness of fielded aircraft, the operators must follow these revised inspection requirements. DESCRIPTION This service letter informs operators of the mandatory changes to the Model 525B Maintenance Manual Revision 27, Chapter 4, Revision 8 and provides a one time grace period for implementation for those that may have exceeded the new Chapter 4 inspection intervals. COMPLIANCE MANDATORY. This service document must be accomplished within 150 flight hours or one year from the date of receipt, whichever occurs first. A service document published by Textron Aviation may be recorded as completed in an aircraft log only when the following requirements are satisfied: 1) The mechanic must complete all of the instructions in the service document, including the intent therein. 2) The mechanic must correctly use and install all applicable parts supplied with the service document kit. Only with written authorization from Textron Aviation can substitute parts or rebuilt parts be used to replace new parts. 3) The mechanic or airplane owner must use the technical data in the service document only as approved and published. 4) The mechanic or airplane owner must apply the information in the service document only to aircraft serial numbers identified in the Effectivity section of the document. 5) The mechanic or airplane owner must use maintenance practices that are identified as acceptable standard practices in the aviation industry and governmental regulations. No individual or corporate organization other than Textron Aviation is authorized to make or apply any changes to a Textron Aviation-issued service document or flight manual supplement without prior written consent from Textron Aviation. Textron Aviation is not responsible for the quality of maintenance performed to comply with this document, unless the maintenance is accomplished at a Textron Aviation-owned Service Center. REFERENCES Cessna Model 525B Maintenance Manual Original Issue - December 10, 2024 SL525B-05-04 Revision 1 - January 7, 2025 Page 1 of 5 Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800 This document contains technical data and is subject to U.S. export regulations. This information has been exported from the United States in accordance with export administration regulations. Diversion contrary to U.S. law is prohibited. ECCN: 9E991 COPYRIGHT © 2024 SL525B-05-04 Page 2 Revision 1 - January 7, 2025 Citation SERVICE LETTER MANDATORY SL525B-05-04 PUBLICATIONS AFFECTED Cessna Model 525B Maintenance Manual ACCOMPLISHMENT INSTRUCTIONS 1. Make an entry in the airplane logbook stating that this service letter was used as a guide to change from the maintenance and inspection program in the following documents. EXISTING 525B MAINTENANCE MANUAL CHAPTER REVISION NEW 525B MAINTENANCE MANUAL CHAPTER REVISION Chapter 4 Airworthiness Limitations, Revision 7 Chapter 4 Airworthiness Limitation, Revision 8 2. Remove the following task from the inspection program. Chapter 54 - Nacelles/Pylons Maintenance Manual Task# Task Title Old Interval Interval/ Note(s) Inspection Document Zone Effectivity 54-50-00-256 Forward Engine Beam at Attachment to Fuselage (Eddy Current) Special Detailed Inspection 12,000 Hours Removed 4-12-MS 411, 412 -0001 & On 54-50-00-257 Aft Engine Beam at Attachment to Fuselage (Eddy Current) Special Detailed Inspection 12,000 Hours Removed 4-12-MS 411, 412 -0001 & On 54-50-00-258 Aft Engine Mount (Eddy Current) Special Detailed Inspection 12,000 Hours Removed 4-12-MS 411, 412 -0001 & On No grace period is required as the inspection requirement is removed from Chapter 4. Citation SERVICE LETTER MANDATORY SL525B-05-04 3. Revise the inspection intervals for the following inspections. Grace periods are shown for aircraft that are beyond or within 150 hours of needing to comply with revised inspections. Chapter 54 - Nacelles/Pylons Maintenance Manual Task# Task Title Old Interval Interval/ Note(s) Inspection Document Zone Effectivity 54-50-00-250 Forward Engine Mount Channel Flange (Eddy Current) Special Detailed Inspection 6000 Hours 6100 hours, then every 4100 hours thereafter 4-12-NA 411, 412 -0001 & On Grace Period For aircraft above 10,050 hours but less than 11,999 hours – Complete Task 54-50-00-250 within 150 hours. NOTE: For aircraft currently at 12,000 hours or more that have completed Task 54-50-00-250, the recurring inspection is due every 4100 hours since last completed. 54-50-00-251 Forward Engine Beam Upper Cap, BL 27.25 (Eddy Current) Special Detailed Inspection 6000 Hours, then every 2400 hours thereafter 6600 hours, then every 2600 hours thereafter 4-12-MX 311, 312 -0001 & On Grace Period No grace period is required as the inspection has increased for both the initial and recurring inspection. 54-50-00-252 Aft Engine Beam Aft Upper Angle Common to Aft Web, BL 24.50 (Eddy