# Continental Critical Service Bulletin 673: Revision C - Rights: © Continental Aerospace Technologies, Inc. Filed by the FAA in regulations.gov docket FAA-2022-0983; AD 2022-16-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Continental Critical Service Bulletin 673](https://openairdocs.org/service-documents/continental/sb-673.md) - Title as filed: Continental Aerospace Technologies Critical Service Bulletin CSB673 Rev C - Pages: 6 - PDF: https://openairdocs.org/files/sha256/c1/85/c18548cd87455bb521d21306feaf028429cd331104a355bf9ed53b8d4d8c3b12 - Page: https://openairdocs.org/service-documents/continental/sb-673/file/c18548cd8745 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 1 of 6 ©2022 Continental Aerospace Technologies P.O. Box 90 Mobile, AL 251.436.8299 CATEGORY 2 CSB673C Supersedes CSB673B TECHNICAL PORTIONS FAA APPROVED CONTINENTAL AEROSPACE TECHNOLOGIES™ CRITICAL SERVICE BULLETIN COMPLIANCE NECESSARY TO MAINTAIN SAFETY SUBJECT: Potential Improperly Lubricated Roller Bearing in  S-1200 Series Magnetos PURPOSE: Notify customers of inspecti on requirement for affected S-1200 Series Magnetos. COMPLIANCE: Within 25 hours after the affected magne to(s) are placed in service. If either magneto has accumulated more than 25 operating hours, inspect prior to next flight. MODELS AFFECTED: Continental I0-346A, 0-470-B, E, G, J, K, L, M, R, S, U; I0-470-C, D, E, F, G, H, J, K, L, M, N, P, R, S, U, V , VO; GTSI0-520-C, D, F, H, K, L, M, N; I0- 520-A, B, BA, BB, C, CB, D, E, F, J, K, L, P; LTSI0-520-AE; TSI0-520-A, AE, AF, B, BB, C, CE, DB, G, H, KB, LB, M, NB, P, R, T, UB, VB, WB; I0- 550-B, C, D, E, F, L; TSI0 L-550-A, B, C equipped with S-1200 Series Magnetos, engines equipped with Contin ental S-1200 Series Magnetos authorized by PMA Supplements 1-54 and new and rebuilt service spare S-1200 Magnetos . I. GENERAL INFORMATION The supplier of Continental Part No. 10-400561, Bearing, Roller, ha s identified one lot of the roller bearings was delivered to Continental with a light corrosion preventive lubricant rather than the specified translucent white grease. Affect ed magnetos assemble d without the properly lubricated roller bearing have a potential to overheat, causing accelerated wear in the contact and cam follower. Affected magneto assemblies must be disassembled to insp ect the roller bearing condition. Roller bearings, Part No. 10-400561 sold as service spares may also be affected. II. AFFECTED MAGNETO SERIAL NUMBERS Continental Magneto mode l and serial numbers are comprised of the component identification, year, month (letters A through L), and a sequential four digit number beginning with the letter A and number one (A001) and increm enting for each unit prod uced during the month. S-1200 Magneto serial numbers use “F” in the component ID position. Magnetos with serial numbers between F21EA057 and F21KA009R , manufactured and sold between May and November 2021, may have be en assembled using th e improperly lubricated roller bearing. Affected units must be disassembled and insp ected to determine if the non- conforming roller bearing was used in assemb ly. S-1200 magneto serial numbers outside the specified range are unaffected - no further action is required. Affected magnetos that have been reworked and inspect ed are being identified with a five-point star stamped on the data plate (see Figure 3) after corrective action is accomplished. If the S- Table 1. Serial Number Format COMPONENT ID YEAR MONTH SERIAL F2 1 E A 0 0 1 ### Page 2 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 2 of 6 1200 Magneto is within the affe cted serial number range and th e magneto data plate is marked with a five-point star, corrective action is complied with - no further action is required. III. CORRECTIVE ACTION Return uninstalled (service spare) magnetos affected by this bulletin in their original packaging to Continental for warranty replacement. Contac t a Continental Customer Service representative for return authorization. Return affected Part No. 10-4 00561, Roller Bearings purchased for inventory to Continental for warranty replacement. If th e roller bearings are in the or iginal packaging, refer to the package labels in Figure 1. Parts identified with Lube Code: 140 are treated with the proper lubricant. If th e label indicates Lube Code:125 , return the bearing(s) to Continental for replacement. If the bearings we re removed from the original packaging, inspect the bearings using the criteria in Section III. B. 8 for disposition. Figure 1. Bearing Package Markings Continental has established a pool of assembled S-1200 ma gnetos and dedicated team to comply with the inspection an d corrective action. Customers may remove an d return the magnetos for warranty replacement or have the repairs accomplished by a local repair station. For affected magneto(s) installed on engine s, inspect affected magneto(s) within 25 hours after installation. If affected magneto has been in service mo re than 25 hours, perform the inspection prior to next flight. A. Remove affected Magneto(s) from the engine (as applicable) and install Serviceable Magneto(s) not affected by this Critical Service Bulletin according to the applicable Instructions for Continued Airworthiness. OR B. Disassemble and Inspect affected Magneto(s) (according to X42001 instructions). NOTE: The following parts must be replaced 100% with new parts upon removal from the magneto, regardless of whether disassembly is for the purpose of inspection, parts replacement, or overhaul: Wedges (35), screws (54), retaining rings (18, 50), washers (55), bearings (59, 63), felt strip (23), capacitor (10), carbon brush (26), and pin (37). If installed, spring (47), gaskets (7, 58), washer (2) and packing (5) shall be replaced at each disassembly with new parts.  The following parts may be reused except as detailed below or unless ### Page 3 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 3 of 6 other conditions warrant replacement : main and retard contact assemblies (30), felt washer (20), gear kit (25). 1. Remove cover retention scre w and lockwasher (1) and plai n washer (2) (if installed) from cover (6). Remove capacitor lead and retard/capacitor (as necessary) lead from contacts to separate cover from magneto. 2. Using an inspection light a nd 4-5X magnifying lens, inspec t shaft in the area between the cam (33) and the bearing (63). a. Translucent white grease resi due (Figure 2) in this area is an indicator of a properly lubricated bearing. If gr ease is detected here, go to “Assembly” procedures in Section C. b. If no white grease is detected in this ar ea, or if greater acce ss in desired, continue disassembly with step 3. 3. Using a pair of padded jaw pliers, grip the drive member on the drive end of the rotating magnet (61). While holding the rotating magnet, loosen the cam securing screw (31) and turn out half way. 4. Remove contacts (30) only as necessary to access cam by loosening screws (27). CAUTION: If the self-locking screw (31) is loosened or removed for any reason, replace it with a new self-locking screw. Torque to 21-25 in-lbs. 5. Use a wedge, removal pry bar, or broad-blad ed screwdriver to loosen the cam from the shaft. If using a stout screwdriver, plac e the end between the bottom of the cam (33) and housing (72). Apply downwa rd pressure to the screwdri ver handle to loosen the cam from the taper of the shaft. Remove the screw (31), washer (32) and cam (33). 6. Using an inspection light and 4-5X magnify ing lens, inspect shaft in the area where it protrudes from the bearing (63). a. Translucent white grease (Fi gure 2) residue in this area is an indicator of a properly lubricated bearing. If gr ease is detected here, go to “Assembly” procedures in Section C. b. If no white grease is detected in this area, continue disassembly with step 7. 7. Disassemble the drive components a nd shaft/flange assembly according to “Disassembly” instructions in the latest revision of S-1200 Se rvice Support Manual, Document Number X42001, paragraphs 4-2.3, 4-2.4, and 4-2.5. 8. Using an inspection light and 4-5X magnify ing lens, inspect rotating magnet shaft (61) at the bearing area and inspect the roller bearing (63) inner diameter. a. Translucent white grease (Figure 2) residue in this area is an indicator of a properly lubricated bearing. If grea se is detected here, go to “Assembly”procedures in Section C. b. If no white grease is de tected in these areas: 1) Inspect rotating magnet shaft (61) at th e bearing area for signs of bearing dis- tress, including but not limited to overheating (bluing, discoloration) and/or dis- placed metal. If rotating magnet shaft (61) shows signs of bearing distress, it must be replaced along with bearing (63), cam (33) and all contact assemblies (30). Remove rotating magnet shaft (61) according to the “Disassembly” ### Page 4 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 4 of 6 instructions in the latest revision of S-1200 Service Support Manual, Document Number X42001, paragraphs 4-2.6, and 4-2.7. 2) Place the magneto housing (72) on the base plate of an arbor press with the drive end down. Using the “R” (for “Remove”) end of the 11-9815 drift, press out the roller bearing (63) and discard. (See X42001, figure 4-4). Figure 2. Bearing Condition Inspection C. Assembly 1. Reassemble magneto according to “Assembly” instructions in the latest revision of S- 1200 Service Support Manual, Document Number X42001, using paragraphs 9-2.1, 9- 2.2, 9-2.3, 9-2.4, 9-2.5, 9-2.6, 9-2.7, 9-2.8, 9-2.9, 9-2.13, 9-2.16, 9-2.17, 9-2.18, 9-2.19, 9-2.20 as necessary. 2. Install magneto on engine according to “A ssembly” instructions in S-1200 Service Support Manual, Document Number X42001, paragr aph 9-3 and the engine manufacturer’s instructions. 3. When corrective action is complete, mark the dataplate in the lower right corner with a commercially available ImpressArt (or equiva lent) 2.50mm five-point star stamp and ball-peen hammer to indicate compliance with this bulletin. Figure 3. Magneto Dataplate After Compliance Bearing - No Grease Greased Bearing Before Installation ### Page 5 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 5 of 6 IV . WARRANTY The actions required to comply with this Service Do cument are covered, up to the Eligible Allowance provided for reimbursement, as shown below. Standard warranty practices apply. Visit the Continental web site at www.continental.aero to obtain copies of Continental Warranty Policies. Complete and email a copy of the linked Compliance Form, along with a copy of the work invoice (and a copy of the repair agency’s W-9 if the repairs are accomplished by a repair facility in the Continental United States) upon completion for reimbursement. Continental reserves the right to request copies of invoices and maintenance records to verify warranty applicability. Allowances/Reimbursements Contact Continental Technical Services at the phone numbers or email address listed below if you have any questions concerning the technical content of this Service Document. 1.888.826.5465 Toll Free in the United States +1.251.436.8299 International Callers email: CMTechnical@continental.aero Eligible Allowances for Reimbursement Labor Hours1 2 1. at published shop rate 2. Labor allowance is per affected magneto. 1 Remove affected magneto(s) from engine for inspection. 0.75 2 Inspect S-1200 Magneto(s) to determine if non-conforming Part No. 10-400561 roller bearing was used in assembly. 0.25 3 Remove and replace Part No. 10-400561 roller bearing, re-assemble magneto. 0.50 4 Install magneto(s) on engine. 0.75 5 Perform engine functional check 0.25 ### Page 6 ISSUED REVISED DOC NO REVISION PAGE 2022/01/31 2022/05/24 CSB673 C 6 of 6 Intentionally Left Blank --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.