NACELLES/PYLONS - ENGINE NACELLE FITTING REPLACEMENT

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Multi-engine SERVICE LETTER MANDATORY MEL-54-03 TITLE NACELLES/PYLONS - ENGINE NACELLE FITTING REPLACEMENT EFFECTIVITY This service document applies to the airplanes that follow and have SK402-47 installed. MODEL SERIAL NUMBERS 402C 402C0001 thru 402C1020 that have SK402-47 - Lower Front Wing Spar Cap Inspection/Modification (Original issue, Revision A or B) installed. 414A 414A0001 thru 414A1212 that have SK402-47 - Lower Front Wing Spar Cap Inspection/Modification (Original issue, Revision A or B) installed. REASON Replace nacelle fittings 5292029-9, 10, -11 -12, -21, -22, -23, and -24 Nacelle fittings with higher flight hours can fatigue and crack more easily. An undetected crack can cause the nacelle fitting to break which could result in flight instability. DESCRIPTION This service document provides instructions to calculate the flight hours for each 5292029 Nacelle Fitting, determine if the nacelle fitting must be replaced and reference to the maintenance manual for replacement instructions. COMPLIANCE MANDATORY. This service document must be accomplished on each nacelle fitting as listed in the table that follows. The Comply with Replacement time for the 5292029 Nacelle Fitting starts accumulating upon receipt of this service document. The inspections required by MEL-54-02 Rev 3 (or later revision) must continue for each 5292029 Nacelle Fitting until that 5292029 Nacelle Fitting is replaced and this service bulletin is complied with. NOTE: To find the 5292029 Nacelle Fitting Hours, look in the airplane logbook to find the airplane flight hours for the compliance with Airworthiness Directive (AD) 2005-12-13 with the installation of SK402-47 - Lower Front Wing Spar Cap Inspection/Modification. Then take the current airplane flight hours and subtract the flight hours when SK402-47 was installed; this is the current hours for the nacelle fittings. MEL-54-03 June 26, 2019 Page 1 of 4 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 © 2019 MEL-54-03 Page 2 June 26, 2019 Multi-engine SERVICE LETTER MANDATORY MEL-54-03 TABLE 2 NACELLE FITTING REPLACEMENT CRITERIA Part Number Total Flight Hours on 5292029 Nacelle Fitting Flight Hours to Comply with 5292029 Nacelle Fitting Replacement 5292029-9, 10, -11 and -12 All Flight Hours 1,000 Flight Hours or 12 Months 5292029-21, -22, 23, and 24 12,000 and more Flight Hours 1,000 Flight Hours or 12 Months 5292029-21, -22, 23, and 24 9,500 - 11,999 Flight Hours 1,400 Flight Hours or 18 Months 5292029-21, -22, 23, and 24 9,499 and less Flight Hours 1,800 Flight Hours or 24 Months 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. CONSUMABLE MATERIAL No specialized consumable materials are required to complete this service document. TOOLING No specialized tooling is required to complete this service document. REFERENCES Cessna Model 402C (1979-1985) Maintenance Manual Cessna Model 414/414A (1970-1985) Service Manual NOTE: To make sure all publications used are complete and current. Refer to www.txtavsupport.com. Multi-engine SERVICE LETTER MANDATORY MEL-54-03 PUBLICATIONS AFFECTED None ACCOMPLISHMENT INSTRUCTIONS 1. From the airplane logbook, determine the nacelle fitting part numbers and total flight hours. Table 1 Nacelle Fitting Hours Nacelle Fitting Part Number Current Flight Hours (A) Flight Hours at Time of Install (subtract from current flight hours) (B) Total Flight Hours on Fitting (A-B) Left Outboard: Left Inboard: Right Inboard: Right Outboard: 2. (Refer to Table 1.) Use Table 1 and Table 2 and compare the nacelle fitting Total Flight Hours on Fitting to the Nacelle Fitting Replacement Criteria Flight Hours. Table 2 Nacelle Fitting Replacement Criteria Part Number Total Flight Hours on 5292029 Nacelle Fitting Flight Hours to Comply with 5292029 Nacelle Fitting Replacement 5292029-9, 10, -11 and -12 All Flight Hours 1,000 Flight Hours or 12 Months 5292029-21, -22, 23, and 24 12,000 and more Flight Hours 1,000 Flight Hours or 12 Months 5292029-21, -22, 23, and 24 9,500 - 11,999 Flight Hours 1,400 Flight Hours or 18 Months 5292029-21, -22, 23, and 24 9,499 and less Flight Hours 1,800 Flight Hours or 24 Months 3. Replace the 5292029 Nacelle Fitting when the flight hours or calendar month is reached. (Refer to manuals as follows:) • Model 402C Maintenance Manual, Chapter 51, Engine Beam Replacement - Approved Repairs.