SB 670BA ---32---042 Page 1 of 1 Jul 02/2014 

## SERVICE BULLETIN REVISION TRANSMITTAL SHEET SERVICE BULLETIN 670BA ---32 ---042 SUBJECT: Landing Gear --- Main Landing Gear Door and Mechanism System --- Inspection of the Inboard Main Landing Gear (MLG) Doors P/N CC670-10520-3, -4, -951, -952, -2003, -2004, -2005, -2006, -2013, -2014, -2015, -2016, KBA670-10500-27, -28, -29, -30, -35, -36, -37, -38, and KCC670-10900-3, -4, -5, -6 This Page transmit: Revision A of Service Bulletin 670BA --- 32 --- 042, dated Jul 02/2014 and Appendix A, dated Nov 05/2013 and Appendix B, dated Nov 05/2013 The changes in this revision have no effect on aircraft that have had this service bulletin incorporated. Reason: Revised Planning Information, paragraph 1., to: Change and add actions to be taken in the time compliance. Revised Accomplishment Instructions, paragraph 2., to: Change and add an action to be taken in Paragraph 2 (B) Procedure (6) (b). Instructions: Discard the copy of Service Bulletin 670BA --- 32 --- 042, dated Nov 05/2013. Replace with the copy attached. Service Bulletin History: Initial issue, dated Nov 05/2013 1SB 670BA-32-042 Page 1 of 12 Nov 05/2013 Revision A, Jul 02/2014 

# 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 BOMBARDIER COMMERCIAL AIRCRAFT 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: 32-12 NUMBER: 670BA-32-042 SUBJECT: Landing Gear --- Main Landing Gear Door and Mechanism System --- Inspection of the Inboard Main Landing Gear (MLG) Doors P/N CC670-10520-3, -4, -951, -952, -2003, -2004, -2005, -2006, -2013, -2014, -2015, -2016, KBA670-10500-27, -28, -29, -30, -35, -36, -37, -38, and KCC670-10900-3, -4, -5, -6 1. PLANNING INFORMATION A. Effectivity (1) Aircraft with the components that follow installed:

PART NUMBER : CC670-10520-3, CC670-10520-4, CC670-10520-951, CC670-10520-952, CC670-10520-2003, CC670-10520-2004, CC670-10520-2005, CC670-10520-2006, CC670-10520-2013, CC670-10520-2014, CC670-10520-2015, CC670-10520-2016, KBA670-10500-27, KBA670-10500-28, KBA670-10500-29, KBA670-10500-30, KBA670-10500-35, KBA670-10500-36, KBA670-10500-37, KBA670-10500-38, KCC670-10900-3, KCC670-10900-4, KCC670-10900-5, KCC670-10900-6 PART SERIAL NUMBER : All

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 2 of 12 Nov 05/2013 Revision A, Jul 02/2014 ON CL-600-2C10 AIRCRAFT THAT HAVE HAD SB 670BA-32-017 AND/OR SB 670BA-32-040 INCORPORATED OR INSTALLED AT THE TIME OF DELIVERY ON CL-600-2C10 WITH SERIAL NUMBERS: 10002 thru 10111 [1]

SPARES : Examine all spare parts. If a part with a part number listed above is found, it is necessary to incorporate this service bulletin.
ALL CL-600-2C10 AIRCRAFT If parts with the part numbers listed above are installed on aircraft, but were not identified at the time of delivery, on the same aircraft model, it is necessary to incorporate this service bulletin. PRODUCTION : [1] 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 Bombardier 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 670BA-32-042

SB 670BA-32-042 Page 3 of 12 Nov 05/2013 Revision A, Jul 02/2014 B. Reason (1) Condition It is possible to have damage on the inboard MLG door(s) P/N CC670-10520-3, -4, -951, -952, -2003, -2004, -2005, -2006, -2013, -2014, -2015, -2016, KBA670-10500-27, -28, -29, -30, -35, -36, -37, -38, and KCC670-10900-3, -4, -5, -6. This can cause the inboard MLG door(s) to break and disconnect from the aircraft. (2) Evidence Twelve inboard MLG door forward-members were found cracked on in-service CL-600-2C10 aircraft. (3) Objective/Benefit This service bulletin gives the procedure to do a visual inspection of the left and the right inboard MLG doors, and if applicable, to repair the inboard MLG doors. C. Description A general and a detailed visual inspection of the left and the right inboard MLG doors is done. If necessary, the damaged inboard MLG door(s) is/are replaced, removed or repaired. D. Compliance Recommended service bulletin. Bombardier recommends that this service bulletin be done at no more than 600 flight hours from the release date of this service bulletin, unless otherwise directed by the airworthiness authority of the operator. Bombardier recommends that this service bulletin be repeated at intervals of 600 flight hours from the initial inspection date, until service bulletin 670BA-32-043 is done, unless otherwise directed by the airworthiness authority of the operator. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). 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 estimates for direct labor done by an experienced crew on an aircraft prepared for maintenance. These estimates do not include the time necessary for:

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 4 of 12 Nov 05/2013 Revision A, Jul 02/2014 - 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 Bombardier as directly related to the accomplishment of this procedure. NOTE: For on-site labor assistance, please speak with a Fleet Services representative for a quote. Contact the Fleet Services Team through the CRC at 514-855-8500 or e-mail at thd.crj@aero.bombardier.com. It will take an estimated1.5 man-hours to complete this service bulletin. The man-hours are divided in the table that follows: TASK MAN-HOURS (1) Job Set-Up 0.25 (2) Procedure 1.00 (3) Test N/A (4) Job Close-Out 0.25 NOTE: The man-hours for the procedure do not include the hours to repair and or replace damaged parts. G. Material --- Price and Availability Refer to paragraph 3.B. for a list of consumables for this service bulletin. 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.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 5 of 12 Nov 05/2013 Revision A, Jul 02/2014 J. Electrical Load Data Not changed. K. References Refer to the SB Introduction document for definition or explanation of service bulletin content Restriction and/or Special Instruction (RSI) C-32-1580-00 Rev B Aircraft Maintenance Manual (AMM) Structural Repair Manual (SRM) Nondestructive Testing Manual (NDTM) For Bombardier reference only: PCA 75521 L. Other Publications Affected None. M. Relationship Chart Not applicable.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 6 of 12 Nov 05/2013 Revision A, Jul 02/2014 2. ACCOMPLISHMENT INSTRUCTIONS Reference Information REFERENCE DESIGNATION AMM 12-00-00-867-801 Standard Aircraft Configuration for Maintenance AMM 32-12-01-000-802 Removal of the Inboard MLG Doors AMM 32-12-01-400-802 Installation of the Inboard MLG Doors NDTM 51-20-009-210, Part 1 Visual - Inspection Procedures SRM 51-26-00-001-001 Cleaning SRM 52-82-02-201-001 Doors, Main Landing Gear - Repairs A. Job Set ---Up (1) Make sure that the aircraft is in standard configuration for maintenance (refer to AMM 12-00-00-867-801). B. Procedure NOTE: This procedure is applicable to the left and the right sides. The procedure that follows is written for the left side. The differences are given. Refer to Figure 1. (1) Do a general visual inspection of the inboard MLG door inner skins (1) and (2), the outer skin (3), and the forward member (4) as follows (refer to NDTM 51-20-009-210, Part 1): (a) Make sure that you do not clean the inboard MLG door at this time. (b) Inspect for signs of deformation, pulled or missing fasteners on the inner skin (1), where it attaches to the cross member and on the inner skin (2), where it attaches to the forward member, as shown in the shaded areas in Figure 1, Views A and B. (c) Inspect for signs of deformation, pulled or missing fasteners on the outer skin (3), where it attaches to the cross member and where it attaches to the forward member, as shown in the shaded area in Figure 1, View C.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 7 of 12 Nov 05/2013 Revision A, Jul 02/2014 (d) Inspect for signs of cracks and/or deformation on the forward member (4) as shown in the shaded area in Figure 1, View D. NOTE: Refer to APPENDIX A for examples of damage. (2) Record the results of the inspections on the data sheet in APPENDIX B. (3) Clean the inboard MLG door with clean, dry, lint-free cloths moist with isopropyl alcohol at the locations shown in the shaded areas in Figure 1, Views A, B, C, and D (refer to SRM 51-26-00-001-001). (4) Do a detailed visual inspection of the inboard MLG door inner skins (1) and (2), the outer skin (3), and the forward member (4) as follows (refer to NDTM 51-20-009-210, Part 1): NOTE: Make sure that you use a sufficient source of lighting. (a) Push the inboard MLG door to the end of its travel limit. Keep it in this position and do the steps that follow: 1 Inspect for signs of deformation, pulled or missing fasteners on the inner skin (1), where it attaches to the cross member and on the inner skin (2), where it attaches to the forward member, as shown in the shaded areas in Figure 1, Views A and B. 2 Inspect for signs of deformation, pulled or missing fasteners on the outer skin (3), where it attaches to the cross member and forward member, as shown in the shaded area in Figure 1, View C. 3 Inspect for signs of cracks and/or deformation on the forward member (4) as shown in the shaded area in Figure 1, View D. NOTE: Refer to APPENDIX A for examples of damage. (b) Pull the inboard MLG door to the end of its travel limit. Keep it in this position and do the steps that follow: 1 Inspect for signs of deformation, pulled or missing fasteners on the inner skin (1), where it attaches to the cross member and on the inner skin (2), where it attaches to the forward member as shown in the shaded areas in Figure 1, View A and B.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 8 of 12 Nov 05/2013 Revision A, Jul 02/2014 2 Inspect for signs of deformation, pulled or missing fasteners on the outer skin (3), where it attaches to the cross member and forward member, as shown in the shaded area in Figure 1, View C. 3 Inspect for signs of cracks and/or deformation on the forward member (4) as shown in the shaded area in Figure 1, View D. NOTE: Refer to APPENDIX A for examples of damage. (5) Record the results of the inspection on the data sheet in APPENDIX B. (6) If damage is found on the inboard MLG door, do as follows: (a) If damage is found on the inner skin(s) (1) and/or (2), and/or the outer skin (3), do as follows: 1 If necessary, remove the damaged inboard MLG door (refer to AMM 32-12-01-000-802). 2 If it is possible, repair the inboard MLG door (refer to SRM 52-82-02-201-001). 3 If it is not possible to repair the inboard MLG door, speak with a representative of Bombardier at the Technical Help Desk at phone number 514-855-8500 for a disposition for the inboard MLG door or do service bulletin 670BA-32-043. 4 If removed and repaired, install the inboard MLG door (refer to AMM 32-12-01-400-802). (b) If damage is found on the forward member (4), do service bulletin 670BA-32-043. (7) If no damage is found on the inboard MLG door, go to the Job Close-Out. C. Job Close ---Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) When this service bulletin is completed, make this entry in the applicable logbooks: “Service Bulletin 670BA-32-042, Revision A, Landing Gear - Main Landing Gear Door and Mechanism System - Inspection of the Inboard Main Landing Gear (MLG) Doors P/N CC670-10520-3, -4, -951, -952, -2003, -2004, -2005, -2006, -2013, -2014, -2015, -2016, KBA670-10500-27, -28, -29, -30, -35, -36, -37, -38, and KCC670-10900-3, -4, -5, -6, incorporated.”

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 9 of 12 Nov 05/2013 Revision A, Jul 02/2014 Inspection Locations of the Inboard MLG Doors Figure 1 (Sheet 1 of 3) Aba7023a03.cgm, sd 28--aout--2013

A CROSS MEMBER (REF)

INBOARD MLG DOOR (REF)

1 FORWARD MEMBER (REF)

B B FORWARD MEMBER (REF)

2 LEGEND 1. Inner skin. 2. Inner skin. NOTES 1. 2. 3. Left side shown, right side opposite. Inspection areas are shaded.
Outboard MLG door not shown for clarity.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 10 of 12 Nov 05/2013 Revision A, Jul 02/2014 Inspection Locations of the Inboard MLG Doors Figure 1 (Sheet 2 of 3)ba8023a04.cgm, sd, 28--aout--2013 CROSS MEMBER (REF) FORWARD MEMBER (REF) INBOARD MLG DOOR (REF)

C A C

3 LEGEND 3. Outer skin. NOTES 1. 2. 3. Left side shown, right side opposite. Inspection area is shaded.
Outboard MLG door not shown for clarity.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 11 of 12 Nov 05/2013 Revision A, Jul 02/2014 Inspection Locations of the Inboard MLG Doors Figure 1 (Sheet 3 of 3)ba7023a05.cgm, sd 28--aout--2013 A

CROSS MEMBER (REF) 4 INBOARD MLG DOOR (REF)

D D

LEGEND 4. Forward member. NOTES 1. 2. 3. Left side shown, right side opposite. Inspection area is shaded.
Outboard MLG door not shown for clarity.

### SERVICE BULLETIN 670BA-32-042

SB 670BA-32-042 Page 12 of 12 Nov 05/2013 Revision A, Jul 02/2014 3. MATERIAL INFORMATION A. Kit Information None. B. Consumable Information For a list of consumables, refer to the different tasks given as references in this service bulletin. C. Special Tools and Equipment There are no special tools and equipment for this service bulletin. D. Disposition of Parts Not applicable. 1APPENDIX A Page A1 of A3 Nov 05/2013 

# APPENDIX A SERVICE BULLETIN 670BA-32-042

EXAMPLES OF DAMAGE ON THE INBOARD MLG DOOR FORWARD MEMBER

The data sheet contained in this appendix is given as references in the ACCOMPLISHMENT INSTRUCTIONS of Service Bulletin 670BA-32-042

### APPENDIX A SERVICE BULLETIN 670BA-32-042

APPENDIX A Page A2 of A3 Nov 05/2013 Left Inboard MLG Doorba8023a01.cgm, kp, August 9, 2013 A

B

A

B

### APPENDIX A SERVICE BULLETIN 670BA-32-042

APPENDIX A Page A3 of A3 Nov 05/2013 Right Inboard MLG Doorba8023a02.cgm, kp, August 9, 2013

BAPPENDIX B Page B1 of B2 Nov 05/2013 

# APPENDIX B SERVICE BULLETIN 670BA-32-042

DATA SHEET

The data sheet contained in this appendix is given as references in the ACCOMPLISHMENT INSTRUCTIONS of Service Bulletin 670BA-32-042

### APPENDIX B SERVICE BULLETIN 670BA-32-042

APPENDIX B Page B2 of B2 Nov 05/2013 AIRCRAFT SERIAL NUMBER: __________________________________________ DATE (OF INSPECTION): _____________________________________________ Left Inboard MLG Door Right Inboard MLG Door Inspection Results (Findings) Inner skin damage YES

____ NO

____ YES

____ NO

____ Outer skin damage YES

____ NO

____ YES

____ NO

____

Forward member damage YES

____ NO

____ YES

____ NO

____ Door Part Number Serial Number

Comments 

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________________________THANK YOU FOR YOUR COMMENTS



## SERVICE BULLETIN FEEDBACK FORM/COMPLIANCE SHEET (YOUR COMMENTS HELP US WRITE BETTER SERVICE BULLETINS) Service Bulletin No.: R evision: Aircraft Serial Number: Date: STRONGLY DISAGREE DISAGREE AGREE STRONGLY AGREE Instructions to do the service bulletin are accurate. Comments: 

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Operator: Service Centre: Name: Telephone or Fax: FAX your comments or feedback to (450) 476---7300 or e-mail to crj_sb_evaluation_form@aero.bombardier.com