# Erickson Service Bulletin 64B20-6: Revision A - Rights: © Erickson. Filed by the FAA in regulations.gov docket FAA-2008-1243; AD 2012-23-11 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Erickson Service Bulletin 64B20-6](https://openairdocs.org/service-documents/erickson/64b20-6.md) - Title as filed: U.S. DOT/FAA - Erickson Air-Crane Service Bulletin - Pages: 11 - PDF: https://openairdocs.org/files/sha256/a3/af/a3af3d0ed19c55aa3d94f2118478e567f9202e7031f103860e5a475c9184a0f9 - Page: https://openairdocs.org/service-documents/erickson/64b20-6/file/a3af3d0ed19c ## Text This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) ERICKSON AIR - CRANE INCORPORATED FAA TYPE CERTIFICATE NO. H6EA TC TYPE CERTIFICATE NO. H-91 SERVICE BULLETIN 64B20-6 TRANSMITTAL SHEET SERVICE BULLETIN NO. 64B20-6 - LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of This page transmits Revision A, dated December 12/2007, to Service Bulletin No. 64B20-6, dated January 5/2005. Please insert the attached pages which are a complete reissue of Service Bulletin 64B20-6. Destroy the superseded pages so that the contents will be as follows: Page No. Revision Date 1 through 9 December 12/2007 The text changed by this revision is indicated by a vertical line in the left-hand margin of this page. REVISION FEATURES: Section 1. PLANNING INFORMATION - Added part numbers 6420-66341-103, 6420-66341-104. Section 2. ACCOMPLISHMENT INSTRUCTIONS - Added part numbers 6420-66341-103, and -104 to Figure 1. 3100 WILLOW SPRINGS ROAD • P.O. BOX 3247 • CENTRAL POINT, OR 97502 • (541) 664-5544 • FAX (541) 664-2312 • www.ericksonaircrane.com ### Page 2 (OCR) TRANSMITTAL SHEET (Continued) RECORD OF REVISIONS Revision Date IR January 5/2005 Erickson Air-Crane Barbara F. Stiger Technical Publications Manager ### Page 3 (OCR) ERICKSON AIR - CRANE INCORPORATED FAA TYPE CERTIFICATE NO. HEA TC TYPE CERTIFICATE NO. H-91 Service Bulletin NO. 64B20-6 (E) SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 1. PLANNING INFORMATION A. Effectivity Model: S-64F Component: 6420-66341-101, 6420-66341-102, 6420-66341-103, 6420-66341-104, 6420-66340-043, 6420-66340-044, and 6420-66301-127 B. Reason To inspect for cracks on the left and right splice fitting (transition fitting) pylon bulkhead assembly (canted), and pylon steel strap and surrounding area. C. Description Requirements for the recurring visual and fluorescent penetrant inspections of the left and right splice fitting (transition fitting), the critical areas of the pylon bulkhead assembly (canted) installation and upper end of pylon steel strap and surrounding area. D. Compliance Work outlined herein is to be accomplished within 20 hours upon receipt of this Service Bulletin. Inspections outlined in Section 2 of this Service Bulletin specifies mandatory maintenance required under sections 43.16 and 91.403 of the Federal Aviation Regulations unless an alternative program has been FAA approved. January 05/2005 Revision A - December 12/2007 Page 1 of 9 3100 WILLOW SPRINGS ROAD • P.O. BOX 3247 • CENTRAL POINT, OR 97502 • (541) 664-5544 • FAX (541) 664-2312 www.ericksonaircrane.com ### Page 4 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: _ LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 1. PLANNING INFORMATION (Continued) E. Approval FAA Approved F. Manpower (Estimated) No. of Men No. of Hours Man-Hours Inspection 1 0.5 0.5 G. Special Tools 10X Magnifying Glass Flashlight H. Weight and Balance No change I. References S-64F Maintenance Manual EAC006 J. Publications Affected S-64F Manufacturer's Progressive Inspection Checklist, EAC4002-1 S-64F All Zone Progressive Checklist, EAC4002-3 K. Electrical Load Data No change L. Personnel Requirements Persons performing the fluorescent penetrant inspection shall be certified as an ASNT Level II, or equivalent, or completed an Erickson Air-Crane training course on the methods and practices of fluorescent penetrant inspection, which would be a Level I area specific. January 05/2005 Page 2 Revision A - December 12/2007 ### Page 5 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS Conduct the following inspections: A. INSPECTIONS NOT TO EXCEED 20 HOURS FROM PREVIOUS INSPECTION. (1) LEFT AND RIGHT HAND SPLICE FITTING. (a) Visually inspect left and right splice fitting (transition fitting) in areas noted in Figure 1, Detail A and B. (b) If crack is suspected, use 10X magnifying glass for closer inspection. (c) If crack is suspected during 10X magnifying glass inspection, perform fluorescent penetrant inspection per ASTM E 1417, Type I, Method A or C. (d) If crack is verified, replace damaged parts). (2) PYLON BULKHEAD ASSEMBLY (Canted). (a) Visually inspect pylon bulkhead assembly (canted) in areas indicated in Figure 2. (b) If crack is suspected, use 10X magnifying glass for closer inspection. (c) If crack is suspected during 10X magnifying glass inspection, perform fluorescent penetrant inspection per ASTM E 1417, Type I, Method A or C. (d) If crack is verified, replace damaged parts). NOTE: Some areas may be repaired in accordance with data specifically approved by the FAA for the particular damage. Contact Erickson Air-Crane Customer Support for repair instructions. (3) EXTERIOR PYLON STEEL STRAP AREA. (Figure 3.) (a) Visually inspect area at top of strap. (b) Inspect upper 12.0 inches of strap for indications of cracks or working rivets as shown in Figure 3. January 05/2005 Revision A - December 12/2007 Page 3 ### Page 6 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS (c) Inspect pylon skin 6.0 inches above and adjacent to the strap for indications of cracks or working rivets as shown in Figure 3. (d) If crack is suspected on outside of pylon, use 10X magnifying glass for closer inspection. (e) If crack is suspected during 10X magnifying glass inspection, perform fluorescent penetrant inspection per ASTM E 1417, Type I, Method A or C. (t) If crack is verified, replace damaged parts). NOTE: Some areas may be repaired in accordance with data specifically approved by the FAA for the particular damage. Contact Erickson Air-Crane Customer Support for repair instructions. B. INSPECTIONS NOT TO EXCEED 155 HOURS. (1) INTERIOR PYLON STEEL STRAP AREA. (a) Remove inspection panel on forward and aft sides of pylon as shown in Figure 3. Visually inspect longeron and bulkhead interior area 12.0 inches below to 6.0 inches above end of strap for indications of cracks or working rivets. (b) If crack is suspected in longeron use 10X magnifying glass for closer inspection. (c) If crack is suspected during 10X magnifying glass inspection, perform fluorescent penetrant inspection per ASTM E 1417, Type I, Method A or C. (d) If crack is verified, replace damaged parts). NOTE: Some areas may be repaired in accordance with data specifically approved by the FAA for the particular damage. Contact Erickson Air-Crane Customer Support for repair instructions. January 05/2005 Page 4 Revision A - December 12/2007 ### Page 7 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS C. AT SPLICE FITTING REPLACEMENT. (1) Perform a visual inspection of pylon skin panels to check for indications of cracking, particularly around fastener holes (Figure 1, Detail A). (2) Perform a fluorescent liquid penetrant inspection of the area around the fastener holes attaching the splice fitting to the tail boom and pylon bulkhead assembly (Figure 1, Detail B) in accordance with ASTM E 1417, Type I, Method A or C. (3) If crack is verified, replace damaged parts). NOTE: Some areas may be repaired in accordance with data specifically approved by the FAA for the particular damage. Contact Erickson Air-Crane Customer Support for repair instructions. D. Record of Compliance (1) Make an appropriate aircraft record entry to show compliance with this Service Bulletin. January 05/2005 Revision A - December 12/2007 Page 5 ### Page 8 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS (Continued) TRANSITION FITTING INSPECTION AREA RIGHT AND LEFT SIDES TYPICAL SEE DETAIL A & B 6420-66341-101, -102, -103, and -104 SPLICE FITTING (TRANSITION FITTING) INSPECTION AREA LEFT AND RIGHT TYPICAL INSPECT 100% PAYING PARTICULAR ATTENTION TO THE ATTACHMENT HOLES DETAIL A (INBOARD LOOKING OUT) RIGHT SIDE SPLICE FITTING LEFT SIDE SPLICE FITTING PYLON SKIN ATTACHMENT PYLON SKIN ATTACHMENT INSPECTION AREA INSPECTION AREA (RIGHT SIDE TYPICAL) (LEFT SIDE TYPICAL) DETAIL B (OUTBOARD LOOKING IN) C3101.64B20-6.Rev A Figure 1. January 05/2005 Page 6 Revision A - December 12/2007 ### Page 9 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS (Continued) VISUALLY INSPECT 100% OF PYLON BULKHEAD ASSEMBLY (CANTED); PAY PARTICULAF ATTENTION TO AREAS INDICATED INSPECTION AREA ... ne e VIEW LOOKING AFT (CANTED) BULKHEAD ASSEMBLY C3121.64B20-6 Figure 2. January 05/2005 Revision A - December 12/2007 Page 7 ### Page 10 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 2. ACCOMPLISHMENT INSTRUCTIONS (Continued) VISUALLY INSPECT THE LAST 12 INCHES OF THE STRAP AND ANOTHER 6420-66301-127 6 INCHES BEYOND THE UPPER END. STRAP INCLUDE THE AREAS AROUND THE INSPECTION AREA STRAP AS INDICATED. STEP (REF) INSPECTION ACCESS COVER REMOVED (REF) ECTION VISUALLY INSPECT THE AREA OF THE STRAP INSIDE OF PYLON IN - 6420-66301-127 STRAP INSPECT AREA AS DESCRIBED PYLON (REF) IN PARAGRAPH A. (3) NOTE: REMOVE AFT INSPECTION COVER - (NOT SHOWN) AND VISUALLY INSPECT THE UPPER LEFT LONGERON IN THE AREAADJACENT TO THE STRAP INSPECTION AREA. (I.E. THE LAST 12 INCHES AND ANOTHER 6 INCHES BEYOND THE UPPER END). C3267.64B20-6 Figure 3. January 05/2005 Page 8 Revision A - December 12/2007 ### Page 11 (OCR) ERICKSON AIR-CRANE SERVICE BULLETIN NO. 64B20-6 SUBJECT: LEFT AND RIGHT SPLICE FITTING (Transition Fitting), PYLON BULKHEAD ASSEMBLY (Canted), Rotary Rudder Boom, and PYLON STEEL STRAP, Inspection of 3. MATERIAL INFORMATION A. Basis for Material Data None B. Bill of Material None C. Consumable Material As required Fluorescent Penetrant System SAE AMS 2644D January 05/2005 • Revision A - December 12/2007 Page 9 --- 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.