Landing Gear − Main Landing Gear (MLG) Shimmy Damper − Inspection and Replacement of the Torque Link Apex−Nut These pages transmit: Revision A of Service Bulletin 670BA−32−019, pages 1 thru 12, dated Sep 18/2008. For aircraft 10231 thru 10239 and 15057 with P/N 49000–21, 49000–22, 49050–9 or 49050– 10 installed, it is necessary to do PART B no later than 4500 flight hours from the release date of Revision A on this service bulletin. Reason:

Revised Planning Information, paragraph 1., to: Add part numbers in the Effectivity. Change the Compliance. Change some vendor service bulletin revisions. This revision also includes small editorial changes that do not have an effect on the technical content. Document Instructions: Discard the copy of Service Bulletin 670BA−32−019, Initial Issue, dated Mar 16/2006. Replace with the copy attached. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 1 of 2 Sep 18/2008 

# SERVICE BULLETIN REVISION TRANSMITTAL SHEET CL−600−2C10, CL−600−2D15 and CL−600−2D24

CANADAIR REGIONAL JET (CRJ) AIRCRAFT

SUBJECT:KEEP GOODRICH SERVICE BULLETINS 49000−32−30 AND 49050−32−31. Service Bulletin History: Initial issue, dated Mar 16/2006. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 2 of 2 Sep 18/2008Landing Gear − Main Landing Gear (MLG) Shimmy Damper − Inspection and Replacement of the Torque Link Apex−Nut
1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service Bulletin: CL−600−2C10 Canadair Regional Jet (CRJ) Aircraft with the component part numbers/serial numbers that follow installed:
PART NUMBER: P/N 49000−11 thru 49000−22 Serial Number: 0001 thru 0284 The serial number can start with MA, MAL or MA− Installed at the time of delivery on aircraft serial numbers: 10003 thru 10239
Spares: Examine all spare units to see if the serial numbers are included in the range shown above. 

# SERVICE BULLETIN

ATA SYSTEM: 32−41 NUMBER: 670BA−32−019

S.B. 670BA−32−019 Page 1 of 12 Mar 16/2006 Revision A, Sep 18/2008 Technical Publications
THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT, THIS SERVICE BULLETIN MUST BE SENT TO THE LESSEE. IF THE OPERATOR HAS SOLD AIRCRAFT OR TRANSFERRED SPARES IN THE LAST SIX MONTHS, THIS SERVICE BULLETIN MUST BE SENT TO THE NEW OWNER UNLESS CONFIRMATION WAS RECEIVED THAT BOMBARDIER REGIONAL AIRCRAFT DIVISION HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST.

SUBJECT:Production: This change will be incorporated before delivery on Aircraft Serial Numbers 10002, 10240 and subsequent. NOTE : The procedure in PART A of this service bulletin was incorporated before delivery on Aircraft Serial Numbers 10224 thru 10239. Service Bulletin: CL−600−2D15 Canadair Regional Jet (CRJ) and CL−600−2D24 Canadair Regional Jet (CRJ) Aircraft with the component part numbers/serial numbers that follow installed:
PART NUMBER: P/N 49050−5 thru 49050−10 Serial Number: 1001 thru 1114 The serial number can start with MA, MAL or MA− Installed at the time of delivery on aircraft serial numbers: 15001 thru 15057
Spares: Examine all spare units to see if the serial numbers are included in the range shown above. Production: This change will be incorporated before delivery on Aircraft Serial Numbers 15058 and subsequent. 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 Bombardier Aerospace Service Bulletin(s). Before you do this bulletin, examine all STC, STA or equivalent action changes to make sure this bulletin can be completed. NOTE : The procedure in PART A of this service bulletin was incorporated on Aircraft Serial Number 15036, 15037, 15040, 15041, 15043 thru 15052 by Service Concession Request (SCR) 0056
– 05 or by REO 670
– 32
– 11
– 0022. NOTE : The procedure in PART A of this service bulletin was incorporated before delivery on Aircraft Serial Numbers 15053 thru 15057. B. Reason 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 2 of 12 Mar 16/2006 Revision A, Sep 18/2008(1) Condition It is possible for the MLG torque−link apex locking−plate, and the locking−plate retainer−bolt to become loose or to detach from the torque−link apex−pin. This can cause high vibration during landing and damages to the main−landing−gear components. (2) Evidence An operator reported high vibration during landing. Analysis shows that the locking plate can engage incorrectly with the tolerance stack−up of the MLG apex−joint. Also, an incorrect installation of the locking plate and torque link apex−nut was found on in−service aircraft. (3) Objective/Benefit This service bulletin gives the procedure to make sure that the torque link apex−pin is installed correctly, and gives the procedure to do the replacement of the torque−link apex−nut. The new torque−link apex−nut will make sure that the locking−plate retainer−bolt is always fully engaged on the torque−link apex−pin. C. Description This service bulletin is divided into two parts: PART A and PART B. PART A − Inspection of the Torque−Link Apex−Pin Circuit breakers are opened. The Goodrich service bulletin is done. The circuit breakers are closed. PART B − Replacement of the Torque−Link Apex−Nut Circuit breakers are opened. The Goodrich service bulletin is done. The circuit breakers are closed. D. Compliance Recommended Service Bulletin. For Aircraft 10003 thru 10223 and 15001 thru 15035, 15038, 15039 and, 15042 Bombardier Aerospace recommends that PART A of this service bulletin be done no more than 900 flight hours from the release date on this service bulletin unless otherwise directed by the airworthiness authority of the operator. NOTE : It is not necessary to do PART A of this Service Bulletin if PART B of this Service Bulletin is done. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 3 of 12 Mar 16/2006 Revision A, Sep 18/2008For Aircraft 10003 thru 10230 and 15001 thru 15056 Bombardier Aerospace recommends that PART B of this service bulletin be done no more than 4500 flight hours from the release date on this service bulletin unless otherwise directed by the airworthiness authority of the operator. For Aircraft 10231 thru 10239 and 15057 Bombardier Aerospace recommends that PART B of this service bulletin be done no more than 4500 flight hours from the release date of Revision A on this service bulletin unless otherwise directed by the airworthiness authority of the operator. E. Approval The technical content of this service bulletin has been approved under the authority of the TCCA Design Approval Organization No: DAO #93−Q−02. F. Manpower The man−hours given below are an estimate for direct labor done by an experienced crew on an aircraft prepared for maintenance. This estimate does not include the time necessary for: − Administrative functions such as planning, liaison, 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 Bombardier Aerospace as directly related to the accomplishment of this procedure. It will take an estimated 1.0 man−hours to complete PART A or PART B of this service bulletin. The man−hours are divided as shown in the table that follows: 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 4 of 12 Mar 16/2006 Revision A, Sep 18/2008TASK MAN−HOURS MAX. PERSONS ELAPSED TIME (1) Job Set−Up 0.5 2 0.25 (2) Procedure N/A N/A N/A (3) Test N/A N/A N/A (4) Job Close−Out 0.5 2 0.25 NOTE : This estimate does not include the man−hours necessary to do Goodrich Service Bulletins 49000
– 32
– 30, 49000
– 32
– 32, 49050
– 32
–31 and, 49050
– 32
–33. Bombardier Aerospace does not cover the labor costs to do PART A and PART B of this service bulletin. G. Material − Price and Availability Refer to Goodrich Service Bulletin 49000
– 32
–30, 49000
–32
– 32, 49050
– 32
– 31 and, 49050
– 32
– 33. (1) Refer to paragraph 3.C. for a list of consumables for this service bulletin. H. Tooling − Price and Availability There are no tool kits for this service bulletin. (1) Refer to paragraph 3.D. 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 − Restriction and/or Special Instruction (RSI), C−32−0864−00, Revision B. − Modification Summary 670T92221, Revision A1. − Goodrich Service Bulletin 49000
– 32
–30, dated Nov 28/05. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 5 of 12 Mar 16/2006 Revision A, Sep 18/2008− Goodrich Service Bulletin 49000
–32
–32 Revision 1, dated Jul 16/08. − Goodrich Service Bulletin 49050
– 32
– 31, dated Nov 28/05. − Goodrich Service Bulletin 49050
– 32
–33 Revision 1, dated Jul 16/08. − Aircraft Maintenance Manual (AMM), CSP B−001, Revision 20. − For Bombardier Aerospace reference only: PCA 71936. L. Other Publications Affected − Aircraft Illustrated Parts Catalog (IPC), CSP B−006. M. Relationship Chart Refer to Goodrich Service Bulletins 49000
– 32
–30, 49000
– 32
– 32, 49050
– 32
– 31 and, 49050
– 32
– 33. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 6 of 12 Mar 16/2006 Revision A, Sep 18/20082. ACCOMPLISHMENT INSTRUCTIONS For Aircraft 10003 thru 10223 and 15001 thru 15035, 15038, 15039 and, 15042 PART A − Inspection of the Torque−Link Apex−Pin A. Job Set−Up (1) Reference Information REFERENCE DESIGNATION AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions (2) Make sure that the aircraft is in standard configuration for maintenance (AMM 12−00−00−867−801). NOTE : Make sure that the Nose Landing Gear (NLG) and the Main Landing Gear (MLG) lockpins are installed. WARNING : OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. YOU CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (3) Obey all the electrical/electronic safety precautions (AMM 24−00−00−910−801). (4) Open, safety, and tag the circuit breakers that follow:
CB−PANEL CB NO. NAME CBP−1 F11 HYD SYST AC PUMP CONT 3B CBP−2 F14 HYD SYST AC PUMP CONT 3A B. Procedure Refer to Figure 1. NOTE : This procedure is applicable to the left and right sides. The procedure that follows is written for the left side. The differences are given. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 7 of 12 Mar 16/2006 Revision A, Sep 18/2008For Aircraft CL−600−2C10 Canadair Regional Jet (CRJ) (1) Do Goodrich service bulletin 49000
– 32
–30. For Aircraft CL−600−2D15 Canadair Regional Jet (CRJ) and CL−600−2D24 Canadair Regional Jet (CRJ) (2) Do Goodrich service bulletin 49050
– 32
–31. C. Job Close−Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the tags and close the circuit breakers that follow:
CB−PANEL CB NO. NAME CBP−1 F11 HYD SYST AC PUMP CONT 3B CBP−2 F14 HYD SYST AC PUMP CONT 3A (3) When PART A of this service bulletin is completed, make this entry in the applicable logbook(s) as follows: "Service Bulletin 670BA−32−019, Revision A, Landing Gear − Main Landing Gear (MLG) Shimmy Damper − Inspection and Replacement of the Torque Link Apex−Nut, PART A, incorporated." For all Aircraft PART B − Replacement of the Torque−Link Apex−Nut A. Job Set−Up (1) Reference Information REFERENCE DESIGNATION AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions (2) Make sure that the aircraft is in standard configuration for maintenance (AMM 12−00−00−867−801). NOTE : Make sure that the Nose Landing Gear (NLG) and the Main Landing Gear (MLG) lockpins are installed. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 8 of 12 Mar 16/2006 Revision A, Sep 18/2008WARNING : OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. YOU CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (3) Obey all the electrical/electronic safety precautions (AMM 24−00−00−910−801). (4) Open, safety, and tag the circuit breakers that follow:
CB−PANEL CB NO. NAME CBP−1 F11 HYD SYST AC PUMP CONT 3B CBP−2 F14 HYD SYST AC PUMP CONT 3A B. Procedure Refer to Figure 1. NOTE : This procedure is applicable to the left and right sides. The procedure that follows is written for the left side. The differences are given. For Aircraft CL−600−2C10 Canadair Regional Jet (CRJ) (1) Do Goodrich service bulletin 49000
– 32
–32. For Aircraft CL−600−2D15 Canadair Regional Jet (CRJ) and CL−600−2D24 Canadair Regional Jet (CRJ) (2) Do Goodrich service bulletin 49050
– 32
–33. C. Job Close−Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the tags and close the circuit breakers that follow:
CB−PANEL CB NO. NAME CBP−1 F11 HYD SYST AC PUMP CONT 3B CBP−2 F14 HYD SYST AC PUMP CONT 3A 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 9 of 12 Mar 16/2006 Revision A, Sep 18/2008(3) When PART B of this service bulletin is completed, make this entry in the applicable logbook(s) as follows: "Service Bulletin 670BA−32−019, Revision A, Landing Gear − Main Landing Gear (MLG) Shimmy Damper − Inspection and Replacement of the Torque Link Apex−Nut, PART B, incorporated." 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 10 of 12 Mar 16/2006 Revision A, Sep 18/2008A

SHIMMY DAMPER REF. A Wheels removed for clarity. NOTEba2851a01.cgm 

### SERVICE BULLETIN 670BA−32−019

Location of the Shimmy Damper on the Main Landing Gear (MLG) Figure 1
S.B. 670BA−32−019 Page 11 of 12 Mar 16/2006 Revision A, Sep 18/20083. MATERIAL INFORMATION A. Kit Information None. B. Rotable Information None. C. Consumable Information There are no consumables for this service bulletin. For a list of consumables, refer to the different tasks and the Goodrich service bulletins given as references in this service bulletin. D. Special Tools and Equipment There are no special tools and equipment for this service bulletins. For a list of special tools and equipment, refer to the different tasks and the Goodrich service bulletin givens as references in this service bulletin. E. Disposition of Parts Refer to Goodrich Service Bulletins 49000
– 32
– 30, 49000
– 32
– 32, 49050
– 32
– 31 and, 49050
– 32
– 33. 

### SERVICE BULLETIN 670BA−32−019

S.B. 670BA−32−019 Page 12 of 12 Mar 16/2006 Revision A, Sep 18/2008THANK YOU FOR ANSWERING THIS EVALUATION FORM UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 450-476-7300 

### SERVICE BULLETIN EVALUATION FORM/COMPLIANCE SHEET (YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS) SERVICE BULLETIN : ISSUE:

STRONGLY DISAGREE NEUTRAL AGREE STRONGLY DISAGREE AGREE x Instructions to do the Service Bulletin were accurate. Comments: 

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x Illustration(s), figure(s), picture(s) and/or kit drawing(s) were helpful to carry out instructions. Comments: 

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x If a parts kit was required, did the kit contents received agree with the contents listed in the bulletin? Comments: 

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x Aircraft hands-on work was accomplished in estimated time. Comments: 

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x Overall, I was satisfied with this Service Bulletin. Comments: 

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PLEASE SUPPLY US WITH THE FOLLOWING DATA AND FAX TO (450) 476-7300: OPERATOR: NAME (Please print) SERVICE CENTER: TELEPHONE: AIRCRAFT SERIAL NO.: FACSIMILE: DATE OF SB INCORPOARTION 670BA-32-019 A