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CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 23 CF34-8C SERVICE BULLETIN - 75-0020 R04 Revised:05/10/2019 SB 75-0020 R04 AIR - ECS LH AND RH DUCTING INSTALLATION (75-00-01) - REPETITIVE INSPECTION OF OBV FITTINGS AND OBV
SYSTEM LINKS Issued:
02/05/2018 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.
GEAE authorizes the Federal Aviation Administration to incorporate this document by reference in an Airworthiness Directive.
Copyright (2019) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION REVISION 4 TO SERVICE BULLETIN 75-0020 Revision 4 is issued to update paragraphs 1., andPLANNING INFORMATION
2., .MATERIAL INFORMATION Revision 3 was issued December 14, 2018. Revision 2 was issued July 20, 2018. Revision 1 was issued April 05, 2018. The original was issued February 05, 2018. 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 these CF34-8C engines:
*CF34-8C engines with more than 6,000 flight hours engine time since new (ETSN) and with an operability bleed start valve [operability bleed valve (OBV)] P/N , P/N , P/N , or P/N .4123T71P02 4123T71P03 4123T71P04 4123T71P05 The OBV and OBV system rod links are affected by this Service Bulletin.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 23 B. Description This Service Bulletin introduces a repetitive inspection threshold for engines with more than 6,000 flight hours ETSN to inspect the OBV for fuel leakage and loose rosan fittings, all the OBV system rod links for wear on the uniball, and fuel lines for proper routing every 880 flight hours.
C. Compliance Category 2 GE recommends that you do this Service Bulletin for engines with more than 6,000 flight hours ETSN and that had either initial inspection performed as specified in CF34-8C S/B or75-0019 repeat inspection performed as specified in this Service Bulletin.
GE recommends that you do this Service Bulletin as soon as possible without effect on revenue service but before 880 flight hours from the Revision 3 issue date of this Service Bulletin. Do again this inspection at intervals of every 880 flight hours or less.
Impact A This recommendation is to address a condition that may affect Flight Safety.
NOTE:This Service Bulletin can be done 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 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 None.
E. Reason
(1) Objective:
To reduce significant events and reduce the potential for fuel leaks and undercowl fire events.
(2) Condition:
There have been two undercowl fire events due to OBV separated fittings.
Refer to the All Operator's Wire (AOW) 17-CF34-006.
In addition, the fleet recently experienced a fitting detachment without a fire event.
(3) Cause:
Most likely root cause indicates that the progressive wear on the OBV manifold support links promotes resonance loads that exceed the normal forces on the port/fitting threads, leading to OBV housing fuel port thread wear.
(4) Inspection:
This repetitive inspection is for the CF34-8C engines with more than 6,000 flight hours ETSN OBV systems to identify possible loose or leaking OBV fittings, worn system rod links, or improper routing of the fuel lines.
NOTE:This repetitive inspection is a containment plan only. The final improvement will be provided by a future Service Bulletin.
(5) Substantiation:
Substantiation is by fleet experience.
F. Approval
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 23 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 0.75 man-hour to do the inspection portion of this Service Bulletin.
H. Weight and Balance Weight and balance are not changed.
I. References (Use the latest version of these documents) All Operator's Wire (AOW) 17-CF34-006 Bombardier CRJ700/900/1000 Aircraft Maintenance Manual (AMM) GEK 9250, Commercial Engine Standard Practices Manual (SPM) Deleted GEK 105091-1, CF34-8C Line Maintenance Manual (LMM) GEK 105092, CF34-8C Illustrated Parts Catalog (IPC) CF34-8C S/B , POWERPLANT - General (71-00-00) -71-0000 Consolidated On-Wing Inspection Recommendations and Servicing Tasks List CF34-8C S/B , AIR - Environmental Control System75-0014 (75-00-01) - Introduction of Redesigned Bleed Air Manifold and Associated Components for the Operability Bleed Start Valve CF34-8C S/B , AIR - ECS LH and RH Ducting Installation75-0019 (75-00-01) - Inspection of OBV Fittings and OBV System Links CF34-8C S/B , AIR - Operability Bleed Valve (75-30-03) -75-0023 Rework of Operability Bleed Start Valve VIN 5080046-101 (P/N 4123T71P04) to VIN 5080046-102 (P/N 4123T71P05) 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 4123T71P05* (1) Valve, Operability Bleed Start Quote (1) Quote AS1895-1-225 (AR) Coupling, Single Latch V-Retainer
475.00 (1) 5 AS1895-7-225 (AR) Seal, E 279.00 (1) 5 B0308015** (AR) Bearing, Rod End NP (-) -- B0202019-11** (AR) Washer, Locking NP (-) -- CN627-0082-201** (AR) Bush NP (-) -- CN627-0045-201 ** (AR) Bush NP (-) --
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 23 J1220G06 (AR) Clamp, Cushioned 8.50 (50) 5 TA027000H006WC (AR) Clip-P 35.75 (1) 5 NP = Not Provisioned NOTE:Prices are provided for planning purposes and are subject to change.
*Part not supplied by GE Engine Services Distribution L.L.C. To procure parts, contact the following:
Parker Aerospace Aircraft On Ground (AOG) U.S.A.
Phone: +1(949)809-8200 Commercial Purchase Order/Customer Service/Technical Inquiry USA Phone: +1(949)809-8200 E-mail: CRC@parker.com Fax: +1(949)272-3255 Commercial Spares Quotes (RFQ) USA Phone: +1(949) 809-8200 E-mail: aerospacerfq@parker.com **Part not supplied by GE Engine Services Distribution L.L.C. To procure parts, contact the following:
Bombardier E-mail: AOG@aero.bombardier.com 24/7 AOG phone: +1-844-272-2720
(3) Consumables:
None.
B. Industry Support Information None.
C. Configuration Chart None.
D. Parts Disposition Discard unserviceable or worn rod ends, bushings, or washers.
Send the unserviceable OBV for repair to the following address:
Parker Aerospace Aircraft On Ground (AOG) U.S.A. Phone: +1(949)809-8200 Commercial Purchase Order/Customer Service/Technical Inquiry USA phone: +1(949)809-8200 E-mail: CRC@parker.com Fax: +1(949)272-3255 Commercial Spares Quotes (RFQ) USA phone: +1(949) 809-8200 E-mail: aerospacerfq@parker.com 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.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 5 of 23
(2) Do a visual inspection of all the engine parts that you can see when you do maintenance. Examine all parts that are removed and that you will install again. Examine all engine parts that are not removed, but that you can see during maintenance. Refer to CF34-8C-AL 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.
B. Inspection
(1) Do not remove the OBV or the fuel lines around the OBV and do(Figure 1) a detailed visual inspection of all the OBV fittings.
(2) Refer to the Table 1 below for the inspection details, unserviceable criteria, and actions.
Table 1. OBV Inspection Inspection Unserviceable Criteria Action Fuel leakage from all the OBV fittings.
A clean trail through the normally stained/dirty rosan ring is an indicative of fuel leakage.
Fuel wetting observed in the rosan ring flange or port joint. Refer to Figure 1.
Replace the OBV immediately.
Refer to the Bombardier CRJ700/900/1000 AMM, 75-31-01, REMOVAL/INSTALLATION or GEK 105091-1, 75-00-00, SPECIAL PROCEDURES 007 for the removal instructions and route it for repair.
All OBV fittings wiggle check.
Relative movement observed between the rosan fitting and OBV housing when the B-nut is wiggled with forefinger and thumb pressure. Refer to Figure 2.
Replace the OBV immediately.
Refer to the Bombardier CRJ700/900/1000 AMM, 75-31-01, REMOVAL/INSTALLATION or GEK 105091-1, 75-00-00, SPECIAL PROCEDURES 007 for the removal instructions and route it for repair.
(3) Document the findings in the Inspection Chart Form and send(Figure 9) the results to GE. Refer to step 3.B.(8).
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links NOTE:
(*) THE ROSAN FITTING IS THE
THREADED INSERT ON EACH OF THE OBV FUEL PORTS.
DRAIN PORT
INSPECTION AREA
RETURN PORT
INSPECTION AREA OBV
SUPPLY PORT
INSPECTION AREA *ROSAN RING ROSAN
FITTING
ASSEMBLY (TYPICAL) 5049111-00 OBV Fuel Leakage Inspection Figure 1 GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG 6 of 23 authorization, is strictly prohibited.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links
OBV FITTING OBV
HOUSING-
SUPPLY FITTING INSPECTION
OBV - OBV FITTING
HOUSING
RETURN FITTING INSPECTION OBV
HOUSING
OBV FITTING 5049112-00 OBV Fittings Wiggle Check Figure 2
(4) If the OBV is unserviceable, remove and replace it with a serviceable OBV.
Refer to the Bombardier CRJ700/900/1000 AMM, 75-31-01, REMOVAL/INSTALLATION Or GEK 105091-1, 75-00-00, SPECIAL PROCEDURES 007.
(5) Do an inspection of the bleed air manifold (OBV plenum assembly) (01-430, 01-430A, 01-430B, or 01-430C, 75-00-01, Figure 3) link rod assemblies and their attaching hardware. Do not disassemble the link rod assemblies while you do the inspection and do as follows:
(a) Remove the single latch V-retainer coupling (01-410, 75-00-01, Figure 4, Sheet 5) from the OBV plenum assembly (01-430, 01-430A, 01-430B, or 01-430C) side only. Make sure that the E-seal (01-420) stays installed.
(b) Do a visual inspection of the link rod assemblies (01-310, 01-310A, 01-450, 01-560A, 01-560B, and 01-570B, 75-00-01, Figure 4, Sheet 1, GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; 7 of 23 transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links Date Printed:
2019/06/07 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 8 of 23 Sheet 2, and Sheet 3) for an unusual condition. Refer to Figure 5.
(c) Use finger force (thumb and index) to do an inspection of the two ends of the support links for loose or missing uniballs. Make sure that the link rod assemblies (01-310, 01-310A, 01-450, 01-560A, 01-560B, and 01-570B, 75-00-01, Sheet 1, Sheet 2, and Sheet 3) show noFigure 4, radial displacement. Refer to and for details.Figure 3 Figure 4
(d) If there is movement of the installed rod end, remove the rod end and do a check for serviceability criteria as follows:
1 Push the right side of the rod end and measure the left side rod end uniball proud dimension.
2 Push the left side of the rod end and measure the right side rod end uniball proud dimension.
NOTE:Unacceptable wear is present if the uniball can be displaced radially by finger force and the face of the rod end uniball is observed to protrude 0.020 inch (0.51 mm) or less from the adjacent parallel face of the rod end and (Figure 3 Figure 4, Sheet
4).
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links
RADIAL LINK ROD
DISPLACEMENT ASSEMBLY
OBV PLENUN ASSEMBLY (01-430) OR (01-430A) OR (01-430B) OR (01-430C) NOTE:
ALL IPC REFERENCES FROM TYPICAL 75-00-01 UNLESS SPECIFIED DIFFERENTLY. 5049113-00 Link Rod Assembly Figure 3 GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; 9 of 23 transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links
LINK ROD ASSEMBLY (01-310) OR (01-310A) NOTE:
ALL IPC REFERENCES FROM 75-00-01 UNLESS SPECIFIED DIFFERENTLY.
5049114-00 Link Rod Assembly Inspection Figure 4 (Sheet 1) GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; 10 of 23 transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links
LINK ROD ASSEMBLY (01-450)
LINK ROD ASSEMBLY (01-560A) LINK ROD ASSEMBLY (01-570B) NOTE:
ALL IPC REFERENCES FROM 75-00-01 UNLESS SPECIFIED DIFFERENTLY.
(PRE-CF34-8C S/B 75-0014) 5049115-01 Link Rod Assembly Inspection Figure 4 (Sheet 2) GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; 11 of 23 transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
CF34-8C Service Bulletins (SBs) SB 75-0020 R04 AIR - ECS LH and RH Ducting Installation (75-00-01) - Repetitive Inspection of OBV Fittings and OBV System Links
LINK ROD ASSEMBLY (01-450)
LINK ROD
ASSEMBLY (01-560B) © LINK ROD
ASSEMBLY (01-560B) (POST-CF34 8C S/B 75-0014) NOTE: (TYPICAL) ALL IPC REFERENCES FROM (3 LOCATIONS) 75-00-01 UNLESS SPECIFIED DIFFERENTLY. 5049120-01 Link Rod Assembly Inspection Figure 4 (Sheet 3) GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2019/06/07 GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG 12 of 23 authorization, is strictly prohibited.