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SB 601R−28−068 Page 1 of 1 Dec 21/2020
SERVICE BULLETIN
REVISION TRANSMITTAL SHEET SERVICE BULLETIN 601R−28−068 SUBJECT: Fuel − Distribution System − Replacement of the Couplings of the Fuel Lines This page transmits:
Revision A of Service Bulletin 601R−28−068, dated Dec 21/2020 The changes in this revision have no effect on aircraft that have had this service bulletin incorporated.
Reason:
Revised Accomplishment Instructions, paragraph 2., to:
Change a /quoteblleftRefer to NO TAG’’ to /quoteblleftRefer to Figure 1’’.
Specified that the coupling assembly includes a sleeve and a clamshell coupling.
This revision also includes small editorial changes that do not have an effect on the technical content.
Instructions:
Discard the copy of Service Bulletin 601R−28−068, dated Dec 03/2020. Replace with the copy attached.
Service Bulletin History:
Initial issue, dated Dec 03/2020 1
SB 601R−28−068 Page 1 of 31 Dec 03/2020 Revision A, Dec 21/2020
SERVICE BULLETIN Technical Publications THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT ,
TRANSFERRED SPARES IN THE LAST SIX MONTHS, SEND THIS SERVICE BULLETIN TO THE NEW
OWNER, UNLESS CONFIRMATION WAS RECEIVED THAT MHIRJ HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST .
SEND THIS SERVICE BULLETIN TO THE LESSEE. IF THE OPERATOR HAS SOLD AIRCRAFT OR ATA SYSTEM: 28−20 NUMBER: 601R−28−068 SUBJECT: Fuel − Distribution System − Replacement of the Couplings of the Fuel Lines
1. PLANNING INFORMATION A. Effectivity
(1) Aircraft Affected:
Service Bulletin: CL−600−2B19 CRJ Series aircraft with serial numbers 7002 thru 7990, and 8000 thru 8112.
Production: There is no production effectivity.
NOTE: The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery of the aircraft or as changed by MHIRJ service bulletins. Before you do this service bulletin, examine all Supplemental Type Certificates (STCs), and Supplemental Type Approvals (STAs) or equivalent action changes to make sure you can complete this service bulletin.
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 2 of 31 Dec 03/2020 Revision A, Dec 21/2020 B. Reason
(1) Condition Corrosion were found on clamshell couplings 14C26−( )A, LC457−( )A and LC459−( )A.
(2) Evidence Condition was found on the aircraft in service at the opportunity of inspections.
(3) Objective/Benefit This service bulletin gives the procedure to replace coupling 14J26−( )A and clamshell couplings P/N 14C26−( )A, LC459−( )A and LC457−( )A by new coupling and clamshell couplings.
C. Description The aircraft is defueled and the electrical power is removed. The main and APU batteries are disconnected. Circuit breakers are opened, access panels are removed, and the fuel tank is prepared for access.
The fuel couplings are removed and replaced by new couplings. A bonding check of the couplings is done A pressure and blockage check of the engine fuel−feed line and of the APU fuel−feed line are done. The panels are installed and the main and APU batteries are connected. The aircraft is fueled and a leak check is done. The main and APU batteries are connected, and the circuit breakers are closed.
D. Compliance Recommended service bulletin.
MHIRJ recommends that this service bulletin be done at no more than 6,600 flight hours or no later than 36 months, from the release date on this service bulletin, whichever comes first, unless otherwise directed by the airworthiness authority of the operator.
NOTE: If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of MHIRJ in the CRC at 1−844−272−2720 (1−844−CRC−CRC0) or e-mail at thd.crj@MHIRJ.com for analysis and to get an approved disposition to complete this service bulletin.
This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs).
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 3 of 31 Dec 03/2020 Revision A, Dec 21/2020 E. Approval The technical content of this service bulletin has been approved under the authority of the TCCA Design Approval Organization No: DAO #20−Q−01.
F . Manpower The man-hours given below are estimates for direct labor done by an experienced crew on an aircraft prepared for maintenance.
These estimates do not include the time necessary for:
−Administrative functions such as planning, liaising, familiarization, and report writing.
−Non-productive elapsed time such as rest time, having meals, and crew shift changes.
−Elapsed time such as for paint to dry, sealant to cure, and fuel tank venting.
−Preparation for modification (unless specified in the Accomplishment Instructions) such as cleaning and getting parts, tools, consumables, and ground equipment.
−Quality assurance inspections, troubleshooting and/or correction of discrepancies found when a task is done.
−All other activities that are not considered by MHIRJ as directly related to the accomplishment of this procedure.
NOTE: For on-site labor assistance, please speak with a Fleet Services representative for an estimate. Call the Fleet Services Team through the CRC at 1−844−272−2720 (1−844−CRC−CRC0) or e-mail at thd.crj@MHIRJ.com.
It will take an estimated 21.0 man-hours to complete this service bulletin. The man-hours are divided in the table that follows (elapsed cure time is not included in the man-hour summary given above):
TASK MAN-HOURS
(1) Job Set-Up 4.0
(2) Procedure 8.0
(3) Test 5.0
(4) Job Close-Out 4.0
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 4 of 31 Dec 03/2020 Revision A, Dec 21/2020 G. Material − Price and Availability
(1) The kits in the tables that follow are available from MHIRJ.
NOTE: For a list of kit contents, refer to paragraph 3.A.
For All Aircraft
KIT NUMBER NAME 601R28−068K1 Fuel Couplings For Aircraft Post SB 601R−28−024 and on Aircraft 7110 thru 7990, 8000 thru 8112
KIT NUMBER NAME 601R28−068K2 Fuel Couplings For All Aircraft
(2) Please send a purchase order to the address below to schedule kit delivery:
MHIRJ ULC Service Bulletin Kit Support Team 12655, boul. Henri−Fabre Mirabel, Québec Canada J7N 1E1 Phone: 1−844−272−2720 (1−844−CRC−CRC0) e-mail: kits@MHIRJ.com Please contact the Service Bulletin Kit Support Team at the address above for terms and conditions.
(3) Refer to paragraph 3.B. for a list of consumables for this service bulletin.
For Business/Corporate Operators All Business/Corporate operators (i.e. operators who do not have a commercial airline operation) refer to SB 800-00-004 for commercial policy coverage and logistics/planning arrangements (refer to www.cic.bombardier.com/technical library/service bulletins/challenger/850/SB 800-00-004).
To place an order for parts or kits, please call Bombardier Parts Logistics at 514−855−2999 or 1−866−538−1247.
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 5 of 31 Dec 03/2020 Revision A, Dec 21/2020 H. Tooling − Price and Availability There are no tool kits for this service bulletin. Refer to paragraph 3.C. for a list of special tools and equipment for this service bulletin.
I. Weight and Balance Not changed.
J. Electrical Load Data Not changed.
K. References Refer to the SB Introduction document for definition or explanation of service bulletin content.
Modification Summary TC601R18631, Rev A For MHIRJ reference only: Restriction and/or Special Instruction (RSI) C−A309, Issue NC For MHIRJ reference only: PCA 77223 L. Other Publications Affected Aircraft Maintenance Manual (AMM) Aircraft Illustrated Parts Catalogue (AIPC) Maintenance Requirement Manual (MRM) M. Relationship Chart PRE-SB
PART NUMBER NAME POST -SBPART NUMBER 14C02−20A ClamshellCoupling 14C18−20A 14C26−12A ClamshellCoupling 14C18−12A 14C26−16A ClamshellCoupling 14C26−16A 14C26−16A ClamshellCoupling 14C18−16A 14C26−20A ClamshellCoupling 14C18−20A
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 6 of 31 Dec 03/2020 Revision A, Dec 21/2020 PRE-SB
PART NUMBER
POST -SB
PART NUMBERNAME 14C26−24A ClamshellCoupling 14C18−24A 14C26−32A ClamshellCoupling 14C18−32A 14J26−20A Coupling LC697−20A LC459−08A ClamshellCoupling 14C18−08A LC457−24A ClamshellCoupling LC656−24A
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 7 of 31 Dec 03/2020 Revision A, Dec 21/2020
2. ACCOMPLISHMENT INSTRUCTIONS Reference Information
REFERENCE DESIGNATION AMM 12−11−28−650−801 Automatic Pressure Refueling AMM 12−11−28−650−804 Suction Defueling AMM 12−11−28−650−805 Gravity Defueling AMM 20−30−00−910−802 Wiggins Couplings − Maintenance Practices AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions AMM 24−32−00−040−803 Deactivation of the Main Battery AMM 24−32−00−040−804 Deactivation of the APU Battery AMM 24−32−00−440−801 Reactivation of the APU Battery AMM 24−32−00−440−802 Reactivation of the Main Battery AMM 28−00−00−910−801 Fuel Safety Precautions AMM 28−11−00−790−802 Leak Rate Check of the Fuel Tank AMM 28−11−00−840−801 Prepare Fuel Tank for Access AMM 28−11−00−840−802 Removal of Fuel Fumes AMM 28−11−01−000−801 Removal of the Honeycomb Access Panel AMM 28−11−01−000−802 Removal of the Aluminum Access Panel AMM 28−11−01−400−801 Installation of the Honeycomb Access Panel AMM 28−11−01−400−802 Installation of the Aluminum Access Panel AMM 28−21−00−790−801 Leak Test of The Engine Fuel−Feed Tubes AMM 51−80−00−760−803 Electrical Bonding test
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 8 of 31 Dec 03/2020 Revision A, Dec 21/2020 A. Job Set-Up NOTE: The steps in the Job Set-Up section of this service bulletin are recommended steps. The steps give a recommendation to get access to the work area. This recommendation is to give a safe work area and to minimize possible damage to surrounding aircraft parts. Alternative steps can be used at the operator discretion.
WARNING: OBEY ALL THE FUEL SAFETY PRECAUTIONS WHEN YOU DO WORK ON THE FUEL SYSTEM AND/OR A FUEL SYSTEM COMPONENT . IF YOU
DO NOT DO THIS, YOU CAN CAUSE INJURIES TO PERSONS AND/OR DAMAGE TO EQUIPMENT .
(1) Obey all the fuel safety precautions (refer to AMM 28−00−00−910−801).
(2) Defuel the aircraft (refer to AMM 12−11−28−650−804 or 12−11−28−650−805).
WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO
MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. IF YOU DO NOT OBEY THE SAFETY PRECAUTIONS,
INJURIES TO PERSONS AND/OR DAMAGE TO THE EQUIPMENT CAN OCCUR.
(3) Obey all the electrical/electronic safety precautions (refer to AMM 24−00−00−910−801).
(4) Disconnect all AC and DC electrical power to the aircraft.
(5) Put a DO NOT CONNECT − FUEL TANK MAINTENANCE placard on the ground power receptacle.
(6) Deactivate the main battery (refer to AMM 24−32−00−040−803).
(7) Deactivate the APU battery (refer to AMM 24−32−00−040−804).
(8) Put a DO NOT CONNECT − FUEL TANK MAINTENANCE placard on each battery.
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 9 of 31 Dec 03/2020 Revision A, Dec 21/2020
(9) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE CBP−1 M6 L FUEL PUMP 221 CBP−1 M7 L FUEL PUMP CONT 221 CBP−1 S1 FUEL SOV R ENG 221 CBP−1 S2 FUEL SOV L ENG 221 CBP−1 S3 FUEL SOV APU 221 CBP−1 M12 FUEL SYST CONT 221 CBP−1 N9 XFER/APU LEFT FUEL SOV 221 CBP−1 N10 XFER/APU FUEL PUMP 221 CBP−1 N11 XFER/APU CONT 221 CBP−1 N12 XFER/APU APU ECU 221 CBP−2 G10 R FUEL PUMP 222 CBP−2 G11 R FUEL PUMP CONT 222 CBP−4 B9 GRAV XFLOW 222 CBP−4 B10 FUEL SYST CONT 222 For Aircraft Pre−SB 601R−24−090
(10) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE CBP−5 B14 FUEL DEFL 311 CBP−5 B15 EMRG REFL 311
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 10 of 31 Dec 03/2020 Revision A, Dec 21/2020 For Aircraft Post−SB 601R−24−090
(11) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE CBP−5 B6 FUEL DEFL 311 CBP−5 B7 EMRG REFL 311 For Aircraft Post−SB 601R−28−022
(12) Open, safety, and tag the circuit breaker that follows:
CB PANEL CB NO. NAME ZONE CBP−2 P9 RIGHT FUEL XFER SOV 222 For All Aircraft
(13) Prepare the fuel tank for access (Refer to AMM 28−11−00−840−801).
(14) Remove the fuel fumes from the fuel tank (refer to AMM 28−11−00−840−802).
(15) Remove the aluminum access panels 510AB, 510BB (610BB), 540AB (640AB), 540CB (640CB), 540FB (640FB), and 550EB (650EB) (refer to AMM 28−11−01−000−802).
(16) Remove the honeycomb access panels 610AB and 540BB (640BB) (refer to AMM 28−11−01−000−801).
SERVICE BULLETIN 601R−28−068 SB 601R−28−068 Page 11 of 31 Dec 03/2020 Revision A, Dec 21/2020 B. Procedure
(1) If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of MHIRJ in the CRC at 1−844−272−2720 (1−844−CRC−CRC0) or e-mail at thd.crj@MHIRJ.com for analysis and to get an approved disposition to complete this service bulletin.
Refer to Figure 1.
(2) Replace the clamshell couplings (7) from the standby fuel−feed tubes as follows:
(a) Remove and discard the clamshell couplings (7) from the standby fuel−feed tubes (refer to AMM 20−30−00−910−802).
NOTE: Do not remove the sleeves.
(b) Install the new clamshell couplings (7) on the standby fuel−feed tubes (refer to AMM 20−30−00−910−802).
(c) Do a bonding test for each of the clamshell couplings (7) (refer to AMM 51−80−00−760−803). The maximum value is 0.10 ohm.
Refer to Figure 2.
(3) Replace the clamshell couplings (7) from the gravity crossflow shutoff valve as follows:
(a) Remove and discard the clamshell couplings (7) from the gravity crossflow shutoff valve (refer to AMM 20−30−00−910−802).
NOTE: Do not remove the sleeves.
(b) Install the new clamshell couplings (7) on the gravity crossflow shutoff valve (refer to AMM 20−30−00−910−802).
(c) Do a bonding test for each of the clamshell couplings (7) (refer to AMM 51−80−00−760−803). The maximum value is 0.10 ohm.
Refer to Figure 3.
(4) Replace the clamshell couplings (5) from the fuel transfer tubes as follows:
(a) Remove and discard the clamshell couplings (5) from the fuel transfer tubes (refer to AMM 20−30−00−910−802).
NOTE: Do not remove the sleeves.