SB 670BA-32-043 Page 1 of 1 Nov 13/2014 

## SERVICE BULLETIN

REVISION TRANSMITTAL SHEET

SERVICE BULLETIN 670BA---32---043

SUBJECT: Landing Gear --- Main Landing Gear Door and Mechanism System ---

Replacement of the Inboard Main Landing Gear (MLG) Doors

This Page transmit: Revision A of Service Bulletin 670BA-32-043, dated Nov 13/2014
The changes in this revision have no effect on aircraft that have had this service bulletin incorporated.

Reason: Revised Planning Information, paragraph 1., to: Add a note in the Compliance section. Add some references. Revised Accomplishment Instructions, paragraph 2., to: Add new steps in the Procedures This revision also includes small editorial changes that do not have an effect on the technical content.

Instructions: Discard the copy of Service Bulletin 670BA---32---043, dated July 02/2014. Replace with the copy attached. Service Bulletin History: Initial issue, dated July 02/2014 1SB 670BA---32---043 Page 1 of 15 July 02/2014 Revision A, Nov 13/2014 

# 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 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---043 SUBJECT: Landing Gear --- Main Landing Gear Door and Mechanism System ---

Replacement of the Inboard Main Landing Gear (MLG) Doors

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---043

SB 670BA---32---043 Page 2 of 15 July 02/2014 Revision A, Nov 13/2014

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---043

SB 670BA---32---043 Page 3 of 15 July 02/2014 Revision A, Nov 13/2014 B. Reason (1) Condition It is possible for the forward member of the inboard MLG door to have cracks. 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 aircraft. (3) Objective/Benefit This service bulletin gives the procedure to replace the left and/or the right inboard MLG doors with new inboard MLG doors. Replacement of the MLG door(s) will prevent them to break and disconnect from the aircraft. C. Description Circuit breakers are opened. The landing gear lockpins are installed. The aircraft is put on jacks. The inboard MLG door(s) is/are removed and discarded. In Service (IS) Modification Summary IS670528200033 is done. The inboard MLG door(s) is/are installed. The lockpins are removed from the MLGs. The clearance check of the inboard MLG door(s) is done.The circuit breakers are closed. The lockpins are installed in the MLGs. The aircraft is lowered. D. Compliance Recommended service bulletin. Bombardier recommends that this service bulletin be done at no more than 6600 flight hours or three years, whichever comes first, from the release date of this service bulletin, unless otherwise directed by the airworthiness authority of the operator. NOTE: It is not necessary to do Service Bulletin 670BA-32-042, when this service bulletin is done. 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 Bombardier Customer Response Centre at phone number 514---855---8500 or send an e-mail at thd.crj@bombardier.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 670BA---32---043

SB 670BA---32---043 Page 4 of 15 July 02/2014 Revision A, Nov 13/2014 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: ---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.

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 5 of 15 July 02/2014 Revision A, Nov 13/2014 For all Aircraft It will take an estimated 14.0 man-hours to complete this service bulletin. The man-hours are divided in the table that follows:

TASK MAN-HOURS (1) Job Set-Up 2.0 (2) Procedure 4.0 (3) Test 6.0 (4) Job Close-Out 2.0

NOTE: The man-hours for the procedure do not include the hours to do IS Modification Summary IS670528200033 G. Material --- Price and Availability (1) The kits in the tables that follow are available from Bombardier Commercial Aircraft. Refer to the paragraphs below for the terms and conditions. NOTE: For a list of kit contents, refer to paragraph 3.A.

For the Left Inboard MLG Door

PART NUMBER NAME QTY 670BA32043K1 Left Inboard MLG Door 1 For the Right Inboard MLG Door

PART NUMBER NAME QTY 670BA32043K2 Right Inboard MLG Door 1

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 6 of 15 July 02/2014 Revision A, Nov 13/2014 For All Aircraft (2) Please send a purchase order to the address below to schedule part delivery: Bombardier Service Bulletin Kit Support Team 123 Garratt Blvd, N42---24 Toronto, Ontario Canada M3K 1Y5 Fax: 416-375-3060 Phone: 416-375-3920 e-mail: sbkits@aero.bombardier.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. 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. Restriction and/or Special Instruction (RSI) C-32-1580-00 Revision C In Service Modification Summary IS670528200033 Aircraft Maintenance Manual (AMM) For Bombardier reference only: PCA 75576 L. Other Publications Affected Aircraft Illustrated Parts Catalogue (AIPC) Aircraft Maintenance Manual (AMM)

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 7 of 15 July 02/2014 Revision A, Nov 13/2014 M. Relationship Chart

PRE-SB PART NUMBER NAME POST-SB PART NUMBER NAME

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 Inboard MLG

Door Assembly CC670-10520-15

CC670-10520-16 CC670-10520-2011 CC670-10520-2012 CC670-10520-967 CC670-10520-968 KCC670-10900-1 KCC670-10900-2 KCC670-10901-1 KCC670-10901-2 KCC670-10901-3 KCC670-10901-4 CC670-10520-13 CC670-10520-14 KBA670-10500-23 KBA670-10500-24 KBA670-10500-25 KBA670-10500-26 KBA670-10500-31 KBA670-10500-32 KBA670-10500-33 KBA670-10500-34 KBA670-10500-51 KBA670-10500-52 KBA670-10500-53 KBA670-10500-54 CC670-10520N1101 CC670-10520N1102 Inboard MLG Door Assembly

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 8 of 15 July 02/2014 Revision A, Nov 13/2014 2. ACCOMPLISHMENT INSTRUCTIONS

Reference Information

REFERENCE DESIGNATION AMM 07-11-01-582-801 Jacking of the Aircraft AMM 07-11-01-586-801 Lowering of the Aircraft AMM 10-11-00-400-801 Installation of the Nose Landing Gear (NLG) Lockpin AMM 10-11-00-400-802 Installation of the Main Landing Gear (MLG) Lockpins 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 SRM 51-26-00-001-001 Cleaning A. Job Set-Up (1) Make sure that the aircraft is in standard configuration for maintenance (refer to AMM 12-00-00-867-801). (2) Make sure that the lockpin is installed on the nose landing gear (refer to AMM 10-11-00-400-801). (3) Make sure that the lockpins are installed on the main landing gear (refer to AMM 10-11-00-400-802). (4) Put the aircraft on jacks (refer to AMM 07-11-01-582-801).

B. Procedure Refer to Figure 1. (1) Do the removal and the installation of the inboard MLG door as follows: (a) Remove and discard the inboard MLG door(s) (1) (refer to AMM 32-12-01-00-802).

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 9 of 15 July 02/2014 Revision A, Nov 13/2014 For aircraft pre-SB 670BA-32-040 For aircraft pre-IS Modification Summary IS670528200033. (2) Do IS Modification Summary IS670528200033. NOTE: During the incorporation of the IS Modification Summary IS670528200033, it is not necessary to remove the outboard MLG door. For all aircraft (3) Install the inboard MLG door(s) (2) (refer to AMM 32-12-01-400-802). (4) 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 Bombardier Customer Response Centre at phone number 514---855---8500 or send an e-mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin.
For aircraft post-SB 670BA-32-040 For aircraft pre-IS Modification Summary IS670528200033. (5) Do IS Modification Summary IS670528200033. NOTE: During the incorporation of the IS Modification Summary IS670528200033, it is not necessary to remove the outboard MLG door. For all aircraft (6) Install the inboard MLG door(s) (3) (refer to AMM 32-12-01-400-802). (7) 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 Bombardier Customer Response Centre at phone number 514---855---8500 or send an e-mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin.

C. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the aircraft from jacks (refer to AMM 07-11-01-586-801). (3) When this service bulletin is completed, make this entry in the applicable logbooks: “Service Bulletin 670BA-32-043, Revision A, Landing Gear --- Main Landing Gear Door and Mechanism System --- Replacement of the Inboard Main Landing Gear (MLG) Doors, incorporated.”

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 10 of 15 July 02/2014 Revision A, Nov 13/2014 Removal of the Inboard MLG Doors Figure 1 (Sheet 1 of 3)ba8158a01.cgm, yl/kl, July 24, 2014 B

A A

B 1

PRE--MOD NOTES 1. Left side shown, right side opposite. LEGEND 1. Inboard MLG door CC670--10520--3 (LH) CC670--10520--4 (RH) CC670--10520--951 (LH) CC670--10520--952 (RH) CC670--10520--2003 (LH) CC670--10520--2004 (RH) CC670--10520--2005 (LH) CC670--10520--2006 (RH) CC670--10520--2013 (LH) CC670--10520--2014 (RH) CC670--10520--2015 (LH) CC670--10520--2016 (RH) KBA670--10500--27 (LH) KBA670--10500--28 (RH) KBA670--10500--29 (LH) KBA670--10500--30 (RH) KBA670--10500--35 (LH) KBA670--10500--36 (RH) KBA670--10500--37 (LH) KBA670--10500--38 (RH) KCC670--10900--3 (LH) KCC670--10900--4 (RH) KCC670--10900--5 (LH) KCC670--10900--6 (RH).

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 11 of 15 July 02/2014 Revision A, Nov 13/2014Installation of the Inboard MLG Doors Figure 1 (Sheet 2 of 3)ba8158a02.cgm, YL, February 13, 2014 B

A A

B 2 LEGEND 2. Inboard MLG door CC670--10520--13 (LH) CC670--10520--14 (RH) CC670--10520--967 (LH) CC670--10520--968 (RH) CC670--10520--2011 (LH) CC670--10520--2012 (RH) KCC670--10901--1 (LH) KCC670--10901--2 (RH) KCC670--10901--3 (LH) KCC670--10901--4 (RH) KCC670--10900--1 (LH) KCC670--10900--2 (RH).

POST--MOD NOTES 1. For Aircraft Pre--SB 670BA--32--040. 2. Left side shown, right side opposite.

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 12 of 15 July 02/2014 Revision A, Nov 13/2014Installation of the Inboard MLG Doors Figure 1 (Sheet 3 of 3)ba8158a03.cgm, YL, February 13, 2014 B

A A

B 3 LEGEND 3. Inboard MLG door CC670--10520--15 (LH) CC670--10520--16 (RH) KBA670--10500--23 (LH) KBA670--10500--24 (RH) KBA670--10500--25 (LH) KBA670--10500--26 (RH) KBA670--10500--31 (LH) KBA670--10500--32 (RH) KBA670--10500--33 (LH) KBA670--10500--34 (RH) KBA670--10500--51 (LH) KBA670--10500--52 (RH) KBA670--10500--53 (LH) KBA670--10500--54 (RH) CC670--10520N1101 (LH) CC670--10520N1102 (RH).

POST--MOD NOTES 1. For Aircraft Post--SB 670BA--32--040. 2. Left side shown, right side opposite.

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 13 of 15 July 02/2014 Revision A, Nov 13/2014 3. MATERIAL INFORMATION
A. Kit Information Kit Contents:
KIT 670BA32043K1 PART NUMBER QTY NAME ALTERNATIVE NOTES CC670-10520-15 1 Left Inboard MLG Door

--- ---

KIT 670BA32043K2 PART NUMBER QTY NAME ALTERNATIVE NOTES CC670-10520-16 1 Right Inboard MLG Door

--- ---

NOTE: For allowable superseded parts, refer to the Parts Supersession Cross References Lists at www.iflybombardier.com under Resources --- Engineering Documents.

NOTE: Some parts listed in the kit content of this service bulletin are supplied in a temporary condition of supply configuration. These parts are identified with a ---SB, /SB, SB or other suffix after the Bombardier engineering part number. When the parts are installed, with the instructions given in the Accomplishment Instructions of this service bulletin, the parts agree with the requirements of the engineering configuration. Refer to the SB Introduction document for more explanation.

B. Consumable Information For a list of consumables, refer to the different tasks, the service bulletin that are given as references in this service bulletin.

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 14 of 15 July 02/2014 Revision A, Nov 13/2014 C. Special Tools and Equipment For a list of special tools and equipment, refer to the different tasks, that are given as references in this service bulletin. D. Disposition of Parts The table that follows shows the disposition of parts on the aircraft (or spares), and the relationship between these parts to the new parts to be installed during the incorporation of this service bulletin. For the Left Inboard MLG Door

PRE-SB PART NUMBER NAME QTY DC POST-SB PART NUMBER NAME

CC670-10520-3 CC670-10520-13 CC670-10520-951 CC670-10520-15 CC670-10520-2003 CC670-10520-967 CC670-10520-2005 CC670-10520-2011 CC670-10520-2013 KCC670-10900-1 CC670-10520-2015 Left Inboard 1 DISKCC670-10901-1 Left Inboard KBA670-10500-27 MLG Door KCC670-10901-3 MLG Door KBA670-10500-29 KBA670-10500-23 KBA670-10500-35 KBA670-10500-25 KBA670-10500-37 KBA670-10500-31 KBA670-10900-3 KBA670-10500-33 KBA670-10900-5 KBA670-10500-51 KBA670-10500-53 CC670-10520N1101

### SERVICE BULLETIN 670BA---32---043

SB 670BA---32---043 Page 15 of 15 July 02/2014 Revision A, Nov 13/2014 For the Right Inboard MLG Door

PRE-SB PART NUMBER NAME QTY DC POST-SB PART NUMBER NAME

CC670-10520-4 CC670-10520-14 CC670-10520-952 CC670-10520-16 CC670-10520-2004 CC670-10520-968 CC670-10520-2006 CC670-10520-2012 CC670-10520-2014 KCC670-10900-2 CC670-10520-2016Left Inboard 1 DISKCC670-10901-2 Left Inboard KBA670-10500-28 MLG Door KCC670-10901-4 MLG Door KBA670-10500-30 KBA670-10500-24 KBA670-10500-36 KBA670-10500-26 KBA670-10500-38 KBA670-10500-32 KBA670-10900-4 KBA670-10500-34 KBA670-10900-6 KBA670-10500-52 KBA670-10500-54 CC670-10520N1102

Disposition code (DC): DIS: Discard Part. 1THANK YOU FOR YOUR COMMENTS



## SERVICE BULLETIN FEEDBACK FORM/COMPLIANCE SHEET (YOUR COMMENTS HELP US WRITE BETTER SERVICE BULLETINS)

Service Bulletin No.: Revision: Aircraft Serial Number: Date:

STRONGLY DISAGREE DISAGREE AGREE STRONGLY AGREE Instructions to do the service bulletin are accurate. Comments: 

## - - - -

Figure(s), picture(s), and/or Appendix were helpful to do the service bulletin. Comments: 

## - - - -

Part(s) or kit(s) agreed with the service bulletin requirement. Comments: 

## - - - -

The service bulletin was accomplished within the estimated time given. Comments: 

## - - - -

Overall, I was satisfied with this service bulletin. Comments: 

## - - - -

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