# Centerpointe Aerospace Service Bulletin 58B75: No revision named - Rights: © Centerpointe Aerospace. Filed by the FAA in regulations.gov docket FAA-2023-1891; AD 2024-12-10 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Centerpointe Aerospace Service Bulletin 58B75](https://openairdocs.org/service-documents/centerpointe/58b75.md) - Title as filed: Centerpointe Aerospace Service Bulletin 58B75 - Pages: 10 - PDF: https://openairdocs.org/files/sha256/91/fd/91fd718c2f2176ecbcf23486765876f1e63935f3976e8c604af6f1dab0fd1b97 - Page: https://openairdocs.org/service-documents/centerpointe/58b75/file/91fd718c2f21 ## Text Some pages are 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 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 1 of 10 Subject: ROTORCRAFT STRUCTURE, Angle Gearbox Mount (AGBM) angle support Non- Destructive Testing (NDT) 1. PLANNING INFORMATION NOTE: This Service Bulletin supplements the information contained in the S - 58T Equalized Inspection and Maintenance Program (EIMP), Document Number SA-4047-20. A. Effectively Model: S-58T Series Rotorcraft per TCDS 1H11 Component: Angle Gearbox Mount (AGBM) PN S58200-02002-544 B. Reason Prior guidance provided under the EIMP required Phase II visual inspection of the Zone 2 AGBM compartment every 250-flight hours. This Bulletin provides additional guidance to enhance the 250- flight hour inspection with Non -Destructive Testing (NDT) using F luorescent Penetrant Inspection (FPI) in accordance with AST M-E-1417, Type 1, Method A, sensitivity level 3. Field experience has indicated that cracking may be evident in the angle supports and cross -members forming the edges of the AG BM. The addition of this inspection will alleviate concerns of functional failure of this component. C. Description Non-Destructive Testing (NDT) is a n industry established process for determination of the integrity of visible damage in aviation components. Since the failure of the angle supports has been established to be a potential cause for AGBM failure, th is Ser vice Bulletin will be a vehicle for det ermining the continued airworthiness of the AGBM in the rotorcraft. D. Compliance The Manufacture r believes compliance to be essential and recommends accomplishment of the work outlined herein in 2 parts as follows: ### Page 2 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 2 of 10 (1) Within 120 days after receipt of this Bulletin, perform Non-Destructive Testing (NDT) using Fluorescent Penetrant Inspection (FPI) in accordance with ASTM-E-1417, Type 1, Method A, sensitivity level 3, of the AGBM angle supports. If cracking is noted the AGBM MUST be replaced. If no cracking is noted but there are indeterminant indications, then the affected area(s) must be evaluated by a qualified structures engineer to determi ne any impact to flightworthiness. Refer to Figure 1 for inspection locations. NOTE: After the requirements of Part 1 of the Accomplishment Instructions have been accomplished, the requirements of that section will no longer be required. (2) At the next and each succeeding 250-hour flight hour EIMP Phase II Zone 2 inspection, perform Non-Destructive Testing (NDT) using Fluorescent Penetrant Inspection (FPI) in accordance with AST M-E-1417, Type 1, Method A, sensitivity level 3. Any indications noted must be evaluated by a qualified structures engineer to determi ne impact to flightworth iness. Refer to Figure 1 for inspection locations. E. Approval NOTE: This Service Bulletin has been submitted to the Fort W orth (FW) Aircraft Certification Office (ACO) for approval/acceptance. F. Manpower (Estimated) Part 1 – Procedure Personnel No. of Hours Total Hours Fluorescent Penetrant Inspection (FPI) of the AGBM angle supports in accordance with ASTM-E-1417, Type 1, Method A, sensitivity level 3 2 1.5 3.0 Part 2 – Procedure Personnel No. of Hours Total Hours Fluorescent Penetrant Inspection (FPI) of the AGBM angle supports in accordance with ASTM-E-1417, Type 1, Method A, sensitivity level 3 2 1.5 3.0 ### Page 3 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 3 of 10 G. Material Nomenclature Qty Source/Specification Isopropyl Alcohol A/R Commercially Available Fluorescent Dye Solution A/R Commercially Available Lint-Free Cloth A/R Commercially Available NOTE: Equivalent Materials may be used H. Tooling Nomenclature Qty Source/Specification Hand-Held Blacklight 1 Commercially Available Blackout Curtain A/R Commercially Available NOTE: Equivalent Tooling may be used I. Electrical Load Data Not Applicable J. Weight and Balance Not Applicable K. Reference(s) SA-4047-20 Equalized Inspection and Maintenance Program (EIMP) SA-4047-18 Maintenance Manual S-58T Rev 20 JUL 87 SA-4047-24 Parts Catalogue S-58T L. Publication(s) Affected. SA-4047-20 Equalized Inspection and Maintenance Program (EIMP) ### Page 4 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 4 of 10 SAFETY ADVISORY WARNINGS are pr ovided in this document to alert operating and maintenance personnel to potential hazards that could result in personal injury from the pe rformance of this repair/alteration if proper precautions are not taken. These warn ings do not r eplace the manufacturer’s recommendations and are provided for guidance only. WARNING: BEFORE USING ANY OF MATERIALS SPECIFIED IN THIS DOCUMENT, BE A WARE OF ALL THE HANDLING, STORAGE, AND DISPOSAL PRECAUTIONS RECOMMENDED BY SUP PLIER O R MF G. F AILURE TO COMPLY WITH THESE RECOMMENDATION MAY RESULT IN PERSON INJURY OR DISEASE. WARNING: ACETONE IS TOXIC AND FLAMMABLE. DO NOT BREATH VAPORS. USE IN WELL VEN TILATED AREA FREE FROM SPARKS, FLAMES OR HOT SURFACE S. WEAR SPLASH GOGGLES , SO LVENT-RESISTANT GLOVES, AND OTHER PROTECTIVE GEAR. IN CASE OF EYE CONTACT, FLUSH WITH WATER FOR 15 MINUTES AND SEEK MEDICAL ATTENTION. IN CASE OF SKIN CONTACT, WASH WITH SOAP AND WATER. WARNING: WEAR THERMAL INSULATED GLOVES, AND OTHER SUITABLE PROTECTION WHEN HANDLING HEATED OR CHILLED PARTS. WARNING: WHEN USING COMPRESSED AIR FOR CLEANING AND DRYING, REGULATE PRESSURE TO 60 POUNDS P ER SQUARE I NCH (PSI) OR LESS. WEAR GOGGLES OR FACE SHIELD TO PROTECT EYES. WARNING: SOLVENT IS TOXIC AND FLAMMABLE. DO NOT BREATH V APORS. USE IN WELL VENTILATED AREA FREE FROM SPARKS, FLAMES OR HOT SURFACE S. WEAR SPLASH GOGGLES, SOLVENT -RESISTANT GLOVES, AND OTHER PROTECTIVE GEAR. IN CASE OF EYE CONTACT, FLUSH WITH WATER FOR 15 MINUTES AND SEEK ME DICAL ATTENTION. IN C ASE OF SKIN CONTACT, WASH WITH SOAP AND WATER. WARNING: ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. DO NOT BREATH VAPORS. USE IN WELL VENTI LATED AREA FREE FROM SPARKS, FLAMES OR HOT SURFACE S. WEAR SPLASH GOGGLES, SO LVENT- RESISTANT GLOVES, AND OTHE R PROTECTIV E GEAR. IN CA SE OF EYE CONTACT, FLUSH WITH WATER FOR 15 MINUTES AND SEEK MEDICAL ATTENTION. IN CASE OF SKIN CONTACT, WASH WITH SOAP AND WATER. ### Page 5 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 5 of 10 2. ACCOMPLISHMENT INSTRUCTIONS Part 1 – Initial Non-Destructive Testing using Fluorescent Penetrant Inspection NOTE: The work described herein MUST be accomplished by a Level II or Level II certified inspector. Refer to Figure 1 for inspection locations. A. Detailed Instructions (1) Open any doors and r emove any access panels to obtain acc ess to the Angel Gear Box Mount. (2) Clean each angle support thoroughly using isopropyl alcohol and a lint-free cloth. (3) Using the blackout curtains set up a darkened area for inspec tion performance iaw ASTM-E-1417. (4) Perform Fluorescent Penetrant Inspection (FPI) of the angle support in accordance with AST M-E-1417, Type 1, Method A, sensitivity level 3. i. If cracking is noted the AGBM assembly MUST be replaced. (5) Repeat for each AGBM angle support and cross-members; 8 total locations. (6) Clean each angle support thoroughly using isopropyl alcohol and a lint-free cloth. Ensure all dye has been removed by checking for residual dye using the hand-held blacklight. B. Record of Compliance (1) Make an appropriate maintenance log card entry to denote; a) Compliance with this Service Bulletin, and b) Incorporation of this Service Bulletin into a maintenance program. (2) Report any findings via email or direct mail to: Centerpointe Aerospace operations@avnresources.com 279 Blackland Road Fate, Texas 75189 ### Page 6 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 6 of 10 2. ACCOMPLISHMENT INSTRUCTIONS -- CONTINUED Part 2 – EIMP Non-Destructive Testing using Fluorescent Penetrant Inspection NOTE: The work described her ein MUST be accomplished by a Level II or Level II certified inspector. Refer to Figure 1 for inspection locations. A. Detailed Instructions (1) Open any doors and r emove any access panels to obtain acc ess to the Angel Gear Box Mount. (2) Clean each angle support thoroughly using isopropyl alcohol and a lint-free cloth. (3) Using the blackout curtains set up a darkened area for inspection performance iaw ASTM-E-1417. (4) Perform Fluorescent Penetrant Inspection (FPI) of the angle support in accordance with AST M-E-1417, Type 1, Method A, sensitivity level 3. i. If crackin g is noted the AGBM assembly MUST be replaced. (5) Repeat for each AGBM an gle support and cross-members; 8 total locations. (6) Clean each angle support thoroughly using isopropyl alcohol and a lint-free cloth. Ensure all dye has been removed by checking for residual dye using the hand-held blacklight. B. Record of Compliance (1) Make an appropriate maintenance log card entry to denote; a) Compliance with this Service Bulletin, and b) Incorporation of this Service Bulletin into a maintenance program. (2) Report any findings via email or direct mail to: Centerpointe Aerospace operations@avnresources.com 279 Blackland Road Fate, Texas 75189 ### Page 7 Centerpointe Aerospace 279 Blackland Road Fate, Texas 75189 SERVICE BULLETIN Service Bulletin No. 58B75 26 April 2023 Page 7 of 10 FIGURE 1A – Installed View FIGURE 1B– Removed View of AGBM; Inspect 8 Locations ### Page 8 (OCR) CENTERPOINTE Centerpointe Aerospace 279 Blackland Road Intelligent Maintenance AEROSPACE Fate, Texas 75189 SERVICE BULLETIN PUBLICATION NO SA4047-24 SIKORSKY AIRCRAFT TECHNICAL SUPPORT SERVICES LIBRARY CONTROLLED COPY #- JUN 1 7 1992 PARTS CATALOG FOR SIKORSKY HELICOPTER COMMERCIAL MODEL S-58T THIS PUBLICATION SUPERSEDES AND REPLACES 5-588 PARTS CATALOG AND S-58T SUPPLEMENTAL PARTS CATALOG PUBLICATION NO. SA4045-14 FOR $-58T MODEL HELICOPTER ONLY NOTICE OF PROPRIETARY RIGHTS This document discloses subject matter in which United Technologies Corporation has proprietary rights. Neither receipt nor possession thereof confers or transfers any right to reproduce or disclose the document, any part thereaf, any information con- tained therein, or any physical article or device, or to practice any method or process, except by written permission from or written agreement with United Technologies Cor- poration. UNITED TECHNOLOGIES SIKORSKY AIRCRAFT 15 SEPTEMBER 1975 COPYRIGHT, 1956 UNITED AIRCRAFT CORP. REVISED 29 FEBRUARY 1988 Service Bulletin No. 58B75 26 April 2023 Page 8 of 10 ### Page 9 (OCR) CENTERPOINTE Centerpointe Aerospace AEROSPACE 279 Blackland Road Intelligent Maintenance Fate, Texas 75189 SERVICE BULLETIN SIMORSKY AIRCRAFT 5-5BT ILLUSTRATLD PARTS CATALDO SECTION IL 584047-24 GROUP ASSEMBLY PARTS LIST FIGURE AND PART DESCRIPTION UNITS USABLE PER ON INDER NUMBER ASSY CODE NUMBER 123456 13 - 51620-66950 STRUCTURE INSTALLATION, BOTTER SEE FIGURE 1°T0 REF 051620-66950-4 S1620-66950-1 • STRUCTURE ASSEMBLY, BUTION 051620-66950-5 STRUCTURE ASSEMBLY, BOTTOM 51620-66958 • - STEP INSTALLATION. PRH CALY/ 051620-66958-26 • STEP IMSTALLATION. PRH DALY/ S1620-66958-3 • • STEP ASSIMULY, /KH CALY 851620-66958-27 * STEP ASSEMBLY. /RH CHLY/ AN3-5A * * • BOLT, /RH ONLY /ATTACHING PARTS/ AN96CPJ10L • WASHER, FRH ONLY/ - 2 AN3-104 • BOLT, /RA ONLY/ AN96 0POJOL WASHER+ FRH UNLYS = * H524694552 • SCREM /RH ONLY/ AN3-54 EGLT SHH UNLY AN960PD1OL • WASHER, /RH OMLY/ - 5 AN3-10Л . BOLT, /AH ONLY/ AN960PD10L • MASHER. ARH ONLYS 51420-66958-5 * • STRAP ASSEMSLY, FORMARD 51620-669584 STRAP ASSEMBLY, AFT N524694C49 • : SCREW+ FUSE WITH 51620-66958-1 FATTACHING PARTE MS24694649 SCREW: /USE WITH S1+20-66958-4 - 10 051620-66711-5 • • • FITTING ASSEMBLY JATTACHING PARTS - 11 DAN26-19 * • BOLT HAN96CP3616L WASHER DAN320-6 UMS24669-283 • COTTER PIN * NUT - 12 ANA577-6-18 BUSHING 51620-61020-2 • SUPPORT INSTALLATION, ALH ONLY/ /STATION I1Z. 51650-62151-1 SUPPORT INSTALLATION, ALH OMLY/ /STATION L67/ - G 51620-61020-6 * SUPPORT ASSEMBLY, /LH ONLY/ /STATION LL2/ 51650-62151-5 • SUPPORT WELD ASSEMBLY, /LH ONLY/ STATION 167/ /ATTACHING PARTS/ - 15 AN3-5A • BOLT. /LH CHLY/ /USE WITH S1620-61020-6J AN960-10L WASHER, /LH ONLY/ /USE WITH 51620-6L020-6/ - 15 AN3-SA ALH ONLY/ FUSE WITH 51650-62151-57 AN960 LOL - 17 AN3-IDA • BULT+ ALH ONLYS AN960-1OL * WASHER, /LH ONLY/ - 18 BULT, FLH ONLY/ FUSE WITH 51050-02151-57 AN96O-1OL . • WASHER. /CH ONLY/ /USE WITH 51650-62151-51 58200-02002-011 • SUPPORT INSTALLATION, ANGLE GEAR BOX - 19 50200-02002-133 • COVER • 58200-02002-451 • * COVER, /FOR EJECTOR TYPE FUEL $YSTEM, ATTACHING PARTS/ - 20 AN3-SA 22 AN960-10L WASHER 22 - 21 58200-02002-044 • BEAM ASSEMBLY FATTACHING PARTS/ - 22 N45464P3A7 * BOLT ANS6OPD 10L - WASHER MSZ1042-3 NUT + - 13 NAS464P 3A7 • BOLT AN960PD10L •A SHER - 24 NAS464P3A5 BOLT AN960P010L MASHER - 25 HAS464FJAT . AOLT AN960PO10L • WASHER - 26 NAS+64P344 . BOLT ANS6OPO LOL WASHER - 27 NAS464P3A5 • JULY AN960P0 1CL • • MASHER # FOR NELIEOPTERS WITH EAGENCY FLOTATION GEAR. FOR HELICOPTERS WITH 15 SEPTEMBER 1979 2-84 Service Bulletin No. 58B75 26 April 2023 Page 9 of 10 ### Page 10 (OCR) CENTERPOINTE AEROSPACE Centerpointe Aerospace 279 Blackland Road Intelligent Maintenance Fate, Texas 75189 SERVICE BULLETIN SECTION DI S-SHT ILLUSTRATED PARTS CATALOG SIRCASMY AIRCRAFT GROUP ASSEMBLY PARTS LIST 544047-24 115 O ш - 109 128 136 106 35 1911.0) FIGURE 33, BOTTOM STAUCTURE INSTALLATION 2-40 15 SEPTEMDER 1975 Service Bulletin No. 58B75 26 April 2023 Page 10 of 10 --- 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.