# Mooney Service Bulletin M20-340C: No revision named - Rights: © Mooney. Filed by the FAA in regulations.gov docket FAA-2021-0223; AD 2021-10-17 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Mooney Service Bulletin M20-340C](https://openairdocs.org/service-documents/mooney/m20-340c.md) - Title as filed: Mooney International Service Bulletin M20-340C_Feb2020 - Pages: 5 - PDF: https://openairdocs.org/files/sha256/fe/02/fe021b2ab39777448259d68d96a972d4037b8b9aa94527cf80e8be23e7ac1542 - Page: https://openairdocs.org/service-documents/mooney/m20-340c/file/fe021b2ab397 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 SERVICE BULLETIN SERVICE BULLETIN M20-340C Date: February 14, 2020 THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL 165 Al Mooney Road North Kerrville, Texas 78028 CORPORATION MOONEY INTERNATIONAL CORPORATION 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830‐896‐6000 www.mooney.com SBM20−340C Page 1 of 5 SUBJECT: M20V ALTERNATOR WIRING, MOUNTING AND SECURITY [Chapter 24 - ELECTRICAL POWER] MODELS/ SN Mooney M20V - 33-0001 THRU 33-0018 AFFECTED: TIME OF Before Next Flight COMPLIANCE: INTRODUCTION: There was a report in the field, of an M20V Acclaim Ultra with an alternator cable damaged on the RH exhaust crossover tube. Mooney Engineering has determined the cable was incor­ rectly positioned. This allowed the wire to contact the RH exhaust crossover tube causing a short circuit to the alternator. This resulted in damage to the cable and crossover tube. This requires mandatory compliance by owners. The attached compliance card needs to be filled out and returned to Mooney International Corporation upon completion of this Service Bulletin M20−340C. INSTRUCTIONS: Read entire procedures before beginning work. 1.1. Turn master switch - OFF. 1.2. Remove top and bottom cowling, refer to Mooney Service and Maintenance Manual. 1.3. Locate alternator cable (refer to Figure SBM20-340-1). Inspect cable for any signs of damage; chafing, cracks in shielding, burnt spots, etc., if cable is damaged, contact MOONEY TECHNICAL SUPPORT support@mooney.com for a replacement cable. 1.4. Locate RH exhaust crossover tube. Inspect for damage; holes, cracks, etc., if damaged contact MOONEY TECHNICAL SUPPORT support@mooney.com for a replacement crossover tube, refer to Figure SBM20-340-1. 1.5. Assure the existing alternator cable clamp is located on the RH engine mount to as indicated in Figure SBM20-340-2 (center). The clamp should be located at the indicated location, approximately 11” ( 11” ±0.5”) from the RH engine mount mounting boss. 1.6. From RH engine mount mounting boss, measure along engine mount tube approx 16” ( 16” ±0.5”) to locate cushion clamps mounting alternator field sensor and cylinder thermocouple wires to engine mount, refer to Figure SBM20‐340‐2. 1.7. Remove (1 qty) mounting bolt AN3-5A, (1 qty) NAS1149F0363P Washer, (1 qty) MS21045L3 Nut, connecting the large and small cushion clamps together, refer to Figure SBM20‐340‐3. 1.8. Insert alternator cable into new MS21919WCJ6 Clamp, mount to existing cushion clamps with new hardware; (1 qty) AN3-6A Bolt, (1 qty) NAS1149F0363P Washer, (1 qty) MS21045L3 Nut, stack clamps as shown in Figure SBM20‐340‐3. 1.9. Tighten stacked clamp assembly together and torque to 20-25 In. Lbs. Make sure slack in alternator cable stays taut along engine mount between the two cushion clamps and assure clearance of at least 2” between the alternator cable and the crossover pipe as shown in Figure SBM20‐340‐3. 1.10. Install top and bottom cowling, refer to Mooney Service and Maintenance Manual. ### Page 2 SERVICE BULLETIN SERVICE BULLETIN M20-340C Date: February 14, 2020 THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL 165 Al Mooney Road North Kerrville, Texas 78028 CORPORATION MOONEY INTERNATIONAL CORPORATION 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830‐896‐6000 www.mooney.com SBM20−340C Page 2 of 5 NOTE: Fill out compliance card and send by MAIL or FAX to Mooney International Corporation as indicated on the attached Compliance Card. 1.11. Return aircraft to service. 1.12. Procedure complete. WARRANTY: Mooney International Corporation, will warrant labor 1 hour when corrective action is done in accordance with procedures of this Service Bulletin for aircraft currently covered under the Mooney International Corporation factory warranty program. REFERENCE 1. Mooney M20V Service and Maintenance Manual DATA: PARTS LIST: Mooney International Corporation, Service Bulletin Parts Kit(s): Not Ordered As Kit Order parts as required below (Standard Shop Supplies): Item P/N Description Qty 1. MS21919WCJ6 CLAMP 1 2. AN3-6A BOLT 1 3. NAS1149F0363P WASHER 1 4. MS21045L3 NUT 1 ### Page 3 SERVICE BULLETIN SERVICE BULLETIN M20-340C Date: February 14, 2020 THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL 165 Al Mooney Road North Kerrville, Texas 78028 CORPORATION MOONEY INTERNATIONAL CORPORATION 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830‐896‐6000 www.mooney.com SBM20−340C Page 3 of 5 DAMAGED CROSSOVER TUBE AND ALTERNATOR WIRE SLACK IN ALTERNATOR WIRE CAUSED INADEQUATE CLEARANCE TO EXHAUST CROSSOVER TUBE Figure SB M20‐340‐1 - EXISTING ALTERNATOR CABLE ROUTING 16”, ±0.5” FROM ENGINE MOUNTING BOSS TO ALTERNATOR CABLE CUSHION CLAMP EXISTING ALTERNATOR CABLE CLAMP 11”, ±0.5” FROM ENGINE MOUNTING BOSS Figure SB M20‐340‐2 - ALTERNATOR CABLE ROUTING LOCATION (RH ENGINE MOUNT) ### Page 4 SERVICE BULLETIN SERVICE BULLETIN M20-340C Date: February 14, 2020 THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL 165 Al Mooney Road North Kerrville, Texas 78028 CORPORATION MOONEY INTERNATIONAL CORPORATION 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830‐896‐6000 www.mooney.com SBM20−340C Page 4 of 5 AN3-6A BOLT (1 QTY) NAS1149F0363P WASHER (1 QTY) MS21919WCJ6 CLAMP (1 QTY) MS21045L3 NUT (1 QTY) (TORQUE TO 20-25 In. Lbs) CAUTION: ALLOW MINIMUM 2” SPACE BETWEEN EXHAUST TUBE AND MS21912WCJ6 CLAMP NOTE: KEEP ALTERNATOR CABLE TAUT WHILE CLAMP IS TORQUED. REF: ALTERNATOR FIELD SENSOR AND CYLINDER THERMOCOU­ PLE WIRES REF: STACK CLAMPS AS SHOWN Figure SB M20‐340‐3 - NEW ALTERNATOR CABLE MOUNTING ### Page 5 SERVICE BULLETIN SERVICE BULLETIN M20-340C Date: February 14, 2020 THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL 165 Al Mooney Road North Kerrville, Texas 78028 CORPORATION MOONEY INTERNATIONAL CORPORATION 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830‐896‐6000 www.mooney.com SBM20−340C Page 5 of 5 MOONEY INTERNATIONAL CORPORATION KERRVILLE, TEXAS 78028 − FAX 830−257−4635 SERVICE (BULLETIN) (INSTRUCTION) NO.________________HAS BEEN COMPLIED WITH ON AIRCRAFT MODEL _______________ SERIAL NUMBER ________________ Tach. Time: Owner: N-Number (Reg. No.) Date of Compliance: Complied By: Form 07-0001 Inspection Report: MOONEY INTERNATIONAL CORPORATION ATT’N: TECHNICAL SUPPORT 165 Al Mooney Road North Kerrville, Texas 78028 PLACE STAMP HERE SEND ALL COMPLIANCE CARDS TO: Mooney International Corporation ATTN:Tech Pubs Dept. 165 Al Mooney Road North Kerrville, TX 78028 FAX: (830) 257‐4635 or EMAIL TO: techpubs@mooney.com To submit Technical Publication changes, visit our website: https://www .mooney.com/service or email a request to: techpubs@mooney.com --- 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.