OIL - TRANSMITTAL OF CONTINENTAL AEROSPACE TECHNOLOGIES CSB07-1A CONNECTING ROD PISTON PIN BUSHING INSPECTION

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 Applicable Model Maintenance/Service Manual Continental Aerospace Technologies Critical Service Bulletin CSB07-01 Revision A dated September 02, 2020. PUBLICATIONS AFFECTED None ACCOMPLISHMENT INSTRUCTIONS 1. Prepare the airplane for maintenance. A. Make sure that the airplane is electrically grounded. B. Make sure that all switches are in the OFF/NORM position. Multi-engine SERVICE LETTER MANDATORY MEL-79-01 C. Disconnect electrical power from the airplane. (1) Disconnect the airplane battery. (2) Disconnect external electrical power. D. Attach maintenance warning tags to the battery and external power receptacle that have "DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS" written on them. 2. Remove the engine cowling. (Refer to the Appropriate Model Maintenance or Service Manual.) 3. Complete the Continental Aerospace Technologies Critical Service Bulletin CSB07-01 Revision A. 4. Install the engine cowling. (Refer to the Appropriate Model Maintenance or Service Manual.) 5. Remove the maintenance warning tags and connect the airplane battery. 6. Make an entry in the airplane logbook that states compliance and method of compliance with this service document. MEL-79-01 April 22, 2021 Page 5 Multi-engine OWNER ADVISORY MEL-79-01 TITLE OIL - TRANSMITTAL OF CONTINENTAL AEROSPACE TECHNOLOGIES CSB07-1A CONNECTING ROD PISTON PIN BUSHING INSPECTION TO: Aircraft Owner of the Cessna and Beechcraft Models as follows: CESSNA MODELS T303, 310, 310A, 310B, 310C, 310D, 310E, 310F, 310G, 310H, E310H, 310I, 310J, 310J-1, E310J, 310K, 310L, 310N, 310P. T310P, 310Q, T310Q, 310R, T310R, 320, 320-1, 320A, 320B, 320C, 320D, 320E, 320F, 335, 336, 337, 337A, 337B, T337B, M337B, 337C, T337C, 337D, T337D, 337E, T337E, F337E, FT337E, 337F, T337F, F337F, FT337F, 337G, F337G, T337G, 337H, T337H, T337H-SP, F337H, FTB337, FTB337G, FTB337H, P337H, 340, 340A, 401, 402, 401A, 401B, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C BEECHCRAFT MODELS 95-55, 95-A55, 95-B55, 95-C55, D55, E55, 58, 58P, 58TC, G58 REASON There have been reports from the field of piston pin bushing material being found in the oil sump and/or the oil filter. Continental Aerospace Technologies has released Revision A to Critical Service Bulletin CSB07-01 which has been extensively revised and provides inspection instructions for the connecting rod piston pin bushing and also includes additional instructions to strain the oil and inspect the oil filter media during routine oil changes. In addition to the expanded inspection, Revision A of CSB07-01 has Instructions for Continued Airworthiness (ICA) that must be placed into specified manuals as listed in Revision A of CSB07-01. COMPLIANCE MANDATORY. Refer to the Continental Aerospace Technologies Critical Service Bulletin CSB07-01 Revision A for compliance information. LABOR HOURS WORK PHASE LABOR-HOURS Inspection As Necessary MATERIAL AVAILABILITY No part are required to complete this service document. WARRANTY None NOTE: As a convenience, service documents are now available online to all our customers through a simple, free-of-charge registration process. If you would like to sign up, please visit the Customer Access link at www.txtavsupport.com to register. MEL-79-01 April 22, 2021 Page 1 of 1 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 © 2021 ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 1 of 6 ©2020 Continental Aerospace Technologies P . O . B o x 9 0 M o b i l e , A L 2 5 1 . 4 3 6 . 8 2 9 9 CATEGORY 2 CSB07-01A Su per se de s S B0 7 - 1 T E C H NI CA L P O RTION S FA A APPROVED CONTINENTAL AEROSPACE TECHNOLOGIES™ CRITICAL SERVICE BULLETIN COMPLIANCE NECESSARY TO MAINTAIN SAFETY SUBJECT: Connecting Rod Piston Pin Bushing Inspection PURPOSE: Provide inspection instructions for the connecting rod piston pin bushing COMPLIANCE: At each cylinder removal or anytime piston pin bushing material is identified during routine maintenance MODELS AFFECTED: Continental Aerospace Technologies new and rebuilt A Series, C Series, E Series, O-200, IO-240, IOF-240, GO-300, O-300, IO-346, IO-360, LTSIO- 360, TSIO-360, GIO-470, O-470, IO-470, TSIO-470, IO-520, GTSIO-520, LTSIO-520, TSIO-520, IO-550, IOF-550, TIARA, TSIO-550, TSIOF-550, and TSIOL-550 engine models. I. GENERAL INFORMATION Continental Aerospace Technologies, Inc. (Continental™) has received reports from the field of piston pin bushing material being found in the oil sump or the oil filter. Piston pin bushings are manufactured from steel-backed bronze and are curved on a radius of approximately 0.62” (see Figure 1). Figure 1. Typical New Piston Pin Bushings II. OIL CHANGE Straining engine oil and during the oil change and inspecting the oil filter media is the least invasive method to determine if connecting rod piston pin bushing material has separated from the connecting rods. ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 2 of 6 1. Perform the oil change at the next scheduled interval according to the instructions in M-0, Section 6-4.8. a. Rather than drain the oil into catch basin and try to strain the spent oil through a paper filter, Continental recommends the following enhanced instructions: 1) Place a pre-cleaned catch basin beneath the oil sump drain. 2) Position a 1000 micron or less (approximately 0.040” or less) mesh screen in the catch basin to strain the oil sump contents. The 1000 micron stainless steel oil strainer (part number 2000) shown in Figure 2 is designed to fit the opening of a standard 5 gallon bucket. It is available for purchased from Arborfab.com. Arbor Fabricating, 14030 Tuttle Hill, Milan, MI 48160. (734) 626-5864. b. Rinse the excess oil residue from the screen, retaining any fragments, particles, or sediment in the screen for analysis. Figure 2. 1000 Micron Stainless Steel Oil Strainer NOTE: The quick drain coupling orifice may trap debris and sediment material. To prevent entrapped material and allow collection of ferrous particles, Continental strongly recommends removing the non-magnetic oil plug (Part No. 532432) or quick drain coupling (Part Nos. 656122, 656995, or 658764) and installing a magnetic drain plug (Part No. 636376 or 656169) in the oil sump to attract and collect ferrous (iron) wear particulate and larger particles that could contaminate the lubrication system. The presence and collection of material on the magnetic drain plug can: 1) indicate an issue with certain engine components; 2) prevent damage to the oil pump and; 3) capture particles that could become lodged in the oil pressure relief-valve and result in a low oil pressure event. Not all engines are equipped with quick drain couplings or magnetic drain plugs - check engine illustrated parts catalog for applicability. c. Examine the strainer, drain plug and/or quick drain coupling for abnormal/excessive wear material, metal fragments, and debris to assess the engine condition. Metal fragments on the magnetic drain plug may indicate excessive wear or part damage.   If piston pin bushing material (see Figure 3) is recovered from an engine, remove the cylinders, pistons, and piston pins (no more than two cylinders at a time) to inspect the connecting rod piston pin bushings. In addition, the piston pin bushing must be inspected for condition each time a cylinder is removed for any reason. ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 3 of 6 Figure 3. Typical Indications of Bushing Fragments III. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA) This bulletin contains updates to the Instructions for Continued Airworthiness required under Title 14 CFR § 43.13(a). A copy of this bulletin must be inserted into the manuals listed in Table 1 of this bulletin until the data is incorporated into the manual by revision or the bulletin is superseded or canceled. WARNING Instructions for Continued Airworthiness in Section 10-9.4 of M-0, Standard Practice Maintenance Manual contain the instructions for the remaining Maintenance and Overhaul Manuals listed below. When performing Connecting Rod Inspection or Maintenance, use the instructions in M-0, Section 10-9.4. Table 1. Applicable Engine ICAs Document Number Applicable Engine Model(s) Section/ Subsection M-0 Continental Spark-Ignited AvGas Engines 10-9.4 M-2 O200D M-0, § 10-9.4 M-6 1 IO240A, B 15-7.9 M-7 IO360A, AB,AF, C, CB, D, DB, ES, G, GB, H, HB, J, JB, K & KB M-0, § 10-9.4 ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 4 of 6 M-8 LTSIO360E, EB, KB, & RB; TSI0360A, AB, B, BB, C, CB, D, DB, E, EB, F, FB, G, GB, H, HB, JB, KB, LB, MB, RB, SB M-0, § 10-9.4 M-11 1 IO520B, BA, BB, C, CB, M & MB 19 M-16 1 IO550A, B, C, G, N, P & R 15-7.2.1 M-18 TSIO550A, B, C, E, G, J, K & N M-0, § 10-9.4 M-22 1 IOF240B 15-6.2.1 OH-15 1 TSIOL550C 16 & 18 OMI-15 1 TSIOL550C 16 OH-24 1 IOF550B, C, N, P & R 9-7.2.3 M-26 1 TSIOF550D, J, K & P 15-7.2.1 X30008 1 A-65 9 X30010 1 C-75, C85, C90 & O200A, B XIII X30013 1 C-125, C-145 & O300 10 X30016 1 E-165, E-185, E-225 IX X30019 1 GO300A, C, D & E 9 X30027 1 IO346 IX X30144 1 TIARA 7 X30033 1 TSIO470 X X30039 1 IO520A, B, BA, BB, C,CB,D, E, F, J, K. L, M & MB 6 X30045 1 GTSIO520C, D, F, H, K, L, M & N IX X30574 1 TSI0520B, BB, BE, D, DB, E, EB, J, JB, K, KB, L, LB, N, NB, UB, VB, & WB 72-20-20 X30575 1 TSIO520AE, AF,C, CE, G, H, M, P, R & T 72-20-20 X30586 1 O470A, B, E, G, J, K, L, M, P, R, S & U 72-20 X30588 1 IO470-C, D, E, F, G, H, J, K, L, M, N, P, R, S, U, V & VO 72-40 X30600 1 TSIOL550A 72-40 X30607 1 IO550D, E, F, L 72-40 1. The contents of these documents will be modified to reference M-0, Section 10-9.4. Table 1. Applicable Engine ICAs Document Number Applicable Engine Model(s) Section/ Subsection ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 5 of 6 IV. INSPECTION CAUTION: Connecting rod piston pin bushing replacement requires specialized tools and procedures and must be accomplished by a shop properly rated to perform the repair. NOTE: Complete Connecting Rod Piston Pin Inspection Criteria may be found in Section 10-9.4. of M-0, Standard Practice Maintenance Manual. If piston pin bushing issues are suspected: 1. Remove the cylinders and pistons from the engine using the instructions contained in the appropriate maintenance or overhaul manual to gain access to the piston pin bushings. 2. Inspect the connecting rods according to the instructions in M-0, Section 10-9.4. 3. Visually inspect the piston pin bushing for any signs of cracks emanating from the piston pin bushing split line, missing bushing material, or signs of bushing movement. 4. Inspect the piston pin bushing for wear according to the instructions in M-0, Standard Practice Maintenance Manual, Section 10-9.4. a. Replace any piston pin bushing that does not meet the installation criteria in M-0, Section 10-9.4 or is found cracked per during the inspection in step 3. b. Replace any piston pin bushing that does not meet the inspection criteria in M-0, Standard Practice Maintenance Manual, Section 10-9.4. V. WARRANTY For engines currently within the warranty period, Continental will reimburse the customer for the parts and labor required to complete the inspection and repairs. ISSUED REVISED DOC NO REVISION PAGE 2007/03/19 2020/09/02 CSB07-01 A 6 of 6 Intentionally Left Blank