# General Electric Service Bulletin 75-0025: No revision named - Rights: © General Electric Company. Filed by the FAA in regulations.gov docket FAA-2021-1167, the docket of AD 2022-09-14. Not covered by OpenAirDocs’ CC0 dedication. - Document: [General Electric Service Bulletin 75-0025](https://openairdocs.org/service-documents/ge/sb-75-0025.md) - Title as filed: GE CF34-8C SB 75-0025 R01 - Pages: 7 - PDF: https://openairdocs.org/files/sha256/3b/c1/3bc1fbf59327a81a220540a2c2ef5634f0b1172956a9cfc9527750e0452d7c4e - Page: https://openairdocs.org/service-documents/ge/sb-75-0025/file/3bc1fbf59327 ## 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 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 1 of 7 CF34-8C SERVICE BULLETIN - 75-0025 R01 Revised:08/01/2019 SB 75-0025 R01 AIR - OPERABILITY BLEED VALVE (75-30-03) - REPLACEMENT AND UPGRADE OF SUSPECT POPULATION OF OBVS VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), AND VIN 5080046-101 (P/N 4123T71P04) Issued: 03/07/2019 GE Designated: -CONFIDENTIAL- The information contained in this document is GE proprietary information and is disclosed in confidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the creation, manufacture, development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or part. This technical data is considered subject to the Export Administration Regulations (EAR) pursuant to 15 CFR Parts 730-774. Transfer of this data by any means to a Non-U.S. Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited. Copyright (2019) General Electric Company, U.S.A. TRANSMITTAL INFORMATION REVISION 1 TO SERVICE BULLETIN 75-0025 Revision 1 is issued to update paragraph 4., .APPENDIX A The original was issued March 07, 2019. Revision bars in the left margin identify changes. 1. PLANNING INFORMATION A. Effectivity * * * CF34-8C1/-8C5/-8C5A1/-8C5A2/-8C5A3/-8C5B1 This Service Bulletin is applicable to all CF34-8C engines. The operability bleed start valves [operability bleed valves (OBVs)] VIN (P/N ), VIN (P/N ), and VIN 5000728-104 4123T71P02 5000728-106 4123T71P03 (P/N ) with the serial numbers listed in Table 1 of5080046-101 4123T71P04 paragraph 4., are affected by this Service Bulletin.APPENDIX A B. Description This Service Bulletin provides instructions to replace the suspect OBVs with serviceable units of that same part number that do not meet the criteria for this Service Bulletin suspect population. Refer to CF34-8C S/B for the75-0023 reworked OBV VIN (P/N ).5080046-102 4123T71P05 C. Compliance Category 2 GE recommends that you do this Service Bulletin as soon as possible without effect on revenue service but not later than six months from the original issue date of this Service Bulletin. Impact A This recommendation is to address a condition that may affect Flight Safety. NOTE:This Service Bulletin can be accomplished on wing or in shop. This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate ### Page 2 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 2 of 7 in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operator's fleet. D. Concurrent Requirements The removed OBVs by this Service Bulletin must be upgraded according to CF34-8C S/B , before returning to service.75-0023 E. Reason (1) Objective: To improve reliability, remove parts from service, and reduce significant events. (2) Condition: The OBVs listed in Table 1 of paragraph 4., have been selected with theAPPENDIX A following criteria: * OBVs that have had a fitting change during shop visit. OR * OBVs that have operated on CF34-8E engines and then were installed on CF34-8C engines. OR * OBVs mounted on engines found with a history of worn OBV system links by CF34-8C S/B or CF34-8C S/B , and CF34-8E S/B findings.75-0019 75-0020 75-0016 (3) Cause: The hardware evaluation and engineering analysis have determined that OBV Rosan fittings meeting the described criteria are more prone to have a fitting pulled out than others. (4) Inspection: This Service Bulletin provides an inspection to identify if the OBVs belong to the suspect population specified in Table 1 of paragraph 4., .APPENDIX A (5) Substantiation: Substantiation is by fleet experience. F. Approval The data contained in this Service Bulletin has been reviewed by the FAA or authorized entity representing the FAA and the repair(s) and modification(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation in the model(s) listed in this Service Bulletin. G. Manpower After you get access to the OBV, you will need approximately 1 man-hour to do the inspection and replacement portion of this Service Bulletin. H. Weight and Balance Weight and balance are not changed. I. References (Use the latest version of these documents) Bombardier CRJ700/900/1000 Aircraft Maintenance Manual (AMM) GEK 9250, Commercial Engine Standard Practices Manual (SPM) GEK 105091-1, CF34-8C Line Maintenance Manual (LMM) GEK 105092, CF34-8C Illustrated Parts Catalog (IPC) CF34-8C S/B , POWER PLANT - General (71-00-00) - Consolidated On-Wing71-0000 Inspection Recommendations and Servicing Tasks List CF34-8C S/B , AIR - ECS LH and RH Ducting Installation (75-00-01) -75-0020 Repetitive Inspection of OBV Fittings and OBV System Links CF34-8C S/B , AIR - Operability Bleed Valve (75-30-03) - Rework of75-0023 Operability Bleed Start Valve VIN 5080046-101 (P/N 4123T71P04) to VIN 5080046-102 (P/N 4123T71P05) CF34-8E S/B , AIR - Air System (75-00-00) - Inspection of OBV Fittings75-0016 and OBV System Links J. Publications Affected None. K. Interchangeability Not applicable. L. Software Accomplishment Summary Not applicable. 2. MATERIAL INFORMATION A. Material - Price and Availability (1) Parts necessary to do this Service Bulletin: None. (2) Other Spare Parts: Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days VIN 5000728-104 (1) Valve, Operability Quote (-) Quote ### Page 3 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 3 of 7 ( )4123T71P02 Bleed Start OR VIN 5000728-106 ( )4123T71P03 (1) Valve, Operability Bleed Start Quote (-) Quote OR VIN 5080046-101 ( )4123T71P04 (1) Valve, Operability Bleed Start Quote (-) Quote OR VIN 5080046-102 ( )4123T71P05 (1) Valve, Operability Bleed Start Quote (-) Quote NOTE:An OBV VIN (P/N ), VIN (P/N ), or VIN 5000728-104 4123T71P02 5000728-106 4123T71P03 (P/N ) can be installed only if it is not listed in Table 1 of5080046-101 4123T71P04 paragraph 4., or if it does not meet the criteria for this Service BulletinAPPENDIX A specified in paragraph 1.E.(2), Condition. NOTE:Prices are provided for planning purposes and are subject to change. (3) Consumables: None. B. Industry Support Information Contact Parker Hannifin Customer Support for Industry Support information. For the OBVs listed in paragraph 4., , the customer must send suspectAPPENDIX A OBVs to be upgraded to VIN (P/N ) as specified in CF34-8C5080046-102 4123T71P05 S/B .75-0023 The purchase order (PO) must be submitted with reference to this Service Bulletin and must include the serial number of the suspect OBV to the address below: Parker Hannifin Customer Support Administrator at: Parker Hannifin Corporation Customer Support Operations 16666 Von Karman Ave. Irvine, California: 92606-4917 U.S.A. Phone: (949) 833-3000 Fax: (949) 809-8646 Repair Station 5PHR421B C. Configuration Chart None. D. Parts Disposition Send removed OBVs to: Parker Hannifin Customer Support Administrator at: Parker Hannifin Corporation Customer Support Operations 16666 Von Karman Ave. Irvine, California: 92606-4917 U.S.A. Phone: (949) 833-3000 Fax: (949) 809-8646 Repair Station 5PHR421B E. Tooling - Price and Availability None. 3. ACCOMPLISHMENT INSTRUCTIONS A. General (1) Before you start this procedure, read the assembly and disassembly techniques section. Refer to GEK 9250, 70-10-00, ASSEMBLY AND DISASSEMBLY TECHNIQUES. (2) Do a visual inspection of all the engine parts that you can see when you do maintenance as follows: (a) Examine all parts that are removed and that you will install again. (b) Examine all engine parts that are not removed, but that you can see during maintenance. Refer to CF34-8C S/B .71-0000 (3) If the engine is on-wing, do the job setup. Refer to the Bombardier CRJ700/900/1000 AMM, 75-31-01, TASK 75-31-01-000-801. (4) Get access to the OBV ( Refer to GEK 105091-1, 75-00-00, SPECIAL PROCEDURESFigure 1). 007. B. Inspection (1) Do a visual inspection of the serial number of the suspect OBV ( located at theFigure 1) 11:00 o'clock position aft looking forward (ALF) of the combustion chamber assembly and do ### Page 4 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 4 of 7 as follows: (a) If the serial number agrees with one of the serial numbers listed in Table 1 of paragraph 4., , do as follows:APPENDIX A 1 Remove the affected OBV ( Refer to GEK 105091-1, 75-00-00, SPECIALFigure 1). PROCEDURES 007. 2 Install a new OBV ( Refer to paragraph 2.A.(2), Other Spare Parts andFigure 1). GEK 105091-1, 75-00-00, SPECIAL PROCEDURES 007. NOTE:An OBV VIN (P/N ), VIN (P/N ), or 5000728-104 4123T71P02 5000728-106 4123T71P03 VIN (P/N ) can be installed only if it is not listed in Table 15080046-101 4123T71P04 of paragraph 4., or if it does not agree with the criteria of thisAPPENDIX A Service Bulletin specified in paragraph 1.E.(2), Condition. 3 Send the removed suspect OBV ( to Parker Hannifin Corporation. Refer toFigure 1) paragraph 2.D., .Parts Disposition NOTE:The removed suspect OBV will be sent and reworked to VIN (P/N 5080046-102 ) as specified in the instructions referenced on CF34-8C S/B at4123T71P05 75-0023 Parker Hannifin Corporation. When the OBVs are reworked and repaired as necessary, they will be returned in serviceable condition. (b) If the OBV serial number is not listed in Table 1 of paragraph 4., , theAPPENDIX A OBV is serviceable and the engine can be returned to service. C. Close-out (1) If the engine is on wing, put the aircraft back to its usual condition. Refer to the Bombardier CRJ700/900/1000 AMM, 75-31-01, TASK 75-31-01-400-801, Step 5 (Close-Out). ### Page 5 (OCR) CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVS VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71PO4) OBV NAME PLATE LOCATION 92003-50002 9920750CN4123171P 03 MFR 3H889 5/N OBV -Parker MADE IN U.S.A IRVINE, CA SERIAL NUMBER THE OBV DOES NOT NEED TO BE REMOVED FROM THE ENGINE TO DO THE INSPECTION OF THE SERIAL NUMBER. THIS FIGURE ONLY PROVIDES ADDITIONAL REFERENCE FOR NAME PLATE LOCATION 5001151-00 Location of the OBV Name Plate Figure 1 4. APPENDIX A - SUSPECT POPULATION OF OBVS Table 1. Affected Population of OBV OBV Serial Number OBV Serial Number OBV Serial OBV Serial OBV Serial Number Number APJ09 APM57 APS81 APV23 ARB25 ARC81 ARC82 ARN42 ASN67 ASY48 AVE07 AVK52 AVM57 AVM58 AVT98 AVU83 AVY28 AWA87 AWC08 AWC09 AWD18 AWD36 AWD84 AWE 31 AWG46 AWJ20 AWMO 6 AWMOS AWP28 AWP30 AWP48 AWP58 AWP 68 AWR50 AWR64 AWS80 AWS82 Deleted AWU93 AWV04 AWV49 AWW73 AYA56 AYB20 AYC31 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or Date Printed: reproduced without the express written consent of GE. Technical data is Page 2021/08/04 considered ITAR and/or EAR controlled; transfer of this data to a Non-US 5 of 7 Person, without USG authorization, is strictly prohibited. ### Page 6 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 6 of 7 AYC37 AYC42 AYE18 AYF42 AYF45 AYF69 AYF88 AYF89 AYG15 AYG19 AYG30 AYJ13 AYJ14 AYJ22 AYK00 AYK60 AYP18 AYR44 AYR64 AYR76 AYR85 AYR86 AYS26 AYV74 Deleted PFBAMS29 PFBAMS67 PFBAMS88 PFBAMT92 PFBAMT95 PFBAMU85 PFBAMU86 PFBAMV57 PFBAMV69 Deleted PFBAMW12 PFBAMW39 PFBAMY17 PFBAMY45 PFBANA70 PFBANA86 PFBANB08 PFBANB10 PFBANB79 PFBANB99 PFBANC57 PFBAND36 PFBAND58 PFBAND63 PFBAND81 PFBAND85 PFBAND86 PFBAND94 PFBANE79 PFBANF29 PFBANF32 PFBANF66 PFBANF67 PFBANF68 PFBANF90 PFBANG28 PFBANG75 PFBANH46 PFBANH52 PFBANJ47 PFBANJ79 PFBANJ80 PFBANJ93 PFBANK28 PFBANK43 PFBANK80 PFBANK95 PFBANL07 PFBANL74 PFBANL77 PFBANN55 PFBANN58 PFBANN60 PFBANN92 PFBANP53 PFBANR30 PFBANR32 PFBANR87 PFBANR90 PFBANS14 PFBANS46 PFBANS53 PFBANS67 PFBANU49 PFBANU76 PFBANV04 PFBANW03 PFBANW13 PFBANW96 PFBANW97 PFBANY23 PFBANY82 PFBAPA33 PFBAPA39 PFBAPA61 PFBAPB13 PFBAPB66 PFBAPD62 PFBAPE62 PFBAPE65 PFBAPF58 PFBAPF96 PFBAPF98 PFBAPG34 PFBAPG72 PFBAPH08 PFBAPJ11 PFBAPJ12 PFBAPK70 PFBAPL99 PFBAPM06 PFBAPM07 PFBAPM58 PFBAPN02 PFBAPN35 PFBAPN36 PFBAPN38 PFBAPN75 PFBAPP31 PFBAPP76 PFBAPR31 PFBAPR87 PFBAPT81 PFBAPV20 PFBAPW20 PFBAPY19 PFBARC07 PFBARC49 PFBARC50 PFBARC52 PFBARC69 PFBARC70 PFBARD30 PFBARD32 PFBARE10 Deleted PFBARE83 PFBARF35 PFBARF75 PFBARF76 PFBARG36 PFBARG83 PFBARG86 PFBARH17 PFBARJ12 PFBARJ94 PFBARK67 PFBARL33 PFBARM54 PFBARM76 PFBARN21 PFBARN23 PFBARP66 PFBARP70 PFBARS04 PFBARS05 PFBARS07 PFBARS47 PFBARS50 PFBARS99 PFBART62 PFBARV02 PFBARV42 PFBARV92 PFBARV93 PFBARW22 PFBARW24 PFBARW94 PFBARY79 PFBARY82 PFBASA43 PFBASA44 PFBASB02 PFBASB13 PFBASB15 PFBASB98 PFBASC44 PFBASC46 PFBASC84 PFBASD68 PFBASE11 PFBASE58 PFBASF45 PFBASF46 PFBASF63 PFBASG66 PFBASH01 PFBASH03 PFBASH11 PFBASH30 PFBASH32 PFBASH82 PFBASJ19 PFBASJ20 PFBASJ98 PFBASK57 PFBASK59 PFBASK85 PFBASK87 PFBASL63 PFBASL90 PFBASM76 PFBASN73 PFBASP61 PFBASR16 PFBASR30 Deleted PFBATA60 Deleted PFBATC33 Deleted PFBATF74 PFBATF97 PFBATG00 PFBATH05 PFBATH75 PFBATH91 PFBATJ31 PFBATJ72 PFBATK03 PFBATK43 PFBATK44 PFBATL13 PFBATL55 PFBATL56 Deleted PFBATM06 PFBATN81 PFBATN82 PFBATR10 PFBATS30 PFBATS31 PFBATT22 PFBATT89 PFBATW21 PFBATY05 PFBAUF90 PFBAUG69 PFBAUH68 PFBAUJ44 PFBAUL79 PFBAUM12 PFBAUM66 Deleted PFBAUP28 PFBAUR02 PFBAUR08 PFBAUR10 PFBAUT57 PFBAUY30 PFBAVB09 PFBAVD04 PFBAVE52 PFBAVH11 PFBAVK81 PFBAVM95 Deleted Deleted PFBAWA94 PFBAWW72 Deleted PFBAYB23 PFBAYB86 Deleted PFBAYF75 PFBAYW60 PFBBAA59 PFBBAB80 PFBBAC30 PFBBAD27 PFBBAD53 PFBBAD90 Deleted Deleted PFBBAF42 ### Page 7 CF34-8C Service Bulletins (SBs) SB 75-0025 R01 AIR - Operability Bleed Valve (75-30-03) - Replacement and Upgrade of Suspect Population of OBVs VIN 5000728-104 (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03), and VIN 5080046-101 (P/N 4123T71P04) Date Printed: 2021/08/04 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 7 of 7 PFBBAF93 Deleted Deleted Deleted Deleted Deleted PFBBAH53 PFBBAH70 PFBBAM70 PFBBAP75 PFBBBF30 Deleted PFBBCM58 PTA-2481 -- NOTE:It is operator's responsibility to inspect for suspect OBVs installed or in stock to be returned to Parker Hannifin Corporation as indicated in this Service Bulletin. NOTE:The OBV has typically eight digits as serial number, starting with the letters PFB, however, it is also highly recommended to check OBVs serial number without the PFB prefix, using the remaining five digits only. GE Designated: - CONFIDENTIAL Subject to the restrictions on the media --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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