# Bombardier Service Bulletin 670BA-32-023

Copy: U.S. DOT/FAA - Service Bulletin ("U.S. DOT/FAA - Service Bulletin"), 20 pages: PDF https://openairdocs.org/files/sha256/cc/36/cc36f168746564b0b3540d8c201c011e7129505167d4e6d5807c6eebba906841; text https://openairdocs.org/service-documents/bombardier/670ba-32-023/file/cc36f1687465.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0031; AD 2011-23-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md)
- Type: Service bulletin (Service Bulletin)
- Number: 670BA-32-023
- Latest revision known: 670BA-32-023, Revision C, dated January 29, 2009 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/670ba-32-023

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2011-23-09](https://openairdocs.org/ad/2011-23-09.md), effective Dec 9, 2011: Revisions A, B and C

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/670ba-32-023/proposed.md).

## Text (20 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0031; AD 2011-23-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1 (OCR)

BOMBARDIER
SERVICE BULLETIN
REVISION TRANSMITTAL SHEET
CL-600-2C10, CL-600-2D15 and CL-600-2D24
CANADAIR REGIONAL JET (CRJ) AIRCRAFT
SERVICE BULLETIN 670BA-32-023
SUBJECT: Landing Gear - Main Landing Gear - Inspection of the Piston Axle P/N 49203-:
and P/N 49203-
These pages transmit:
Revision C of Service Bulletin 670BA-32-023,
pages 1 thru 14 adated Jan 29/2009
Revision B of Appendix A
pages A1 thru A3, dated Mar 05/2008.
The changes in this revision have no effect on aircraft that have incorporated a
previous issue of this service bulletin.
Reason:
Revised Planning Information, paragraph 1., to:
Change the compliance.
Change the revision of some references.
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-32-023, Revision B, dated Mar 05/2008.
Replace with the copy attached.
Jan 29/2009  S.B. 670BA-32-023
Page 1 of 2

### Page 2 (OCR)

SERVICE BULLETIN 670BA-32-023
KEEP GOODRICH SERVICE BULLETIN 49200-32-45 Revision 1
Service Bulletin History:
Initial issue, dated Oct 24/2007.
Revision A, dated Jan 07/2008.
Revision B, dated Mar 05/2008
Jan 29/2009  S.B. 670BA-32-023
Page 2 of 2

### Page 3 (OCR)

BOMBARDIER
SERVICE BULLETIN
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 COMMERCIAL AIRCRAFT
DIVISION HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST.
ATA SYSTEM: 32-11  NUMBER: 670BA-32-023
SUBJECT:  Landing Gear - Main Landing Gear - Inspection of the Piston Axle P/N
49203-3 and P/N 49203-5
1. PLANNING INFORMATION
A. Effectivity
(1) Aircraft Affected:
Service Bulletin:  CL600-2C10 Canadair Regional Jet (CRJ) Aircraft
with the component part number that follows
installed:
PART NUMBER:  P/N 49203-3 or P/N 49203-5
Installed at the time  10003 thru 10265
of delivery on
aircraft serial
numbers:
Spares:  Examine all spare parts. If a part, with a part
number listed above, is found, it is necessary to
incorporate Goodrich Service Bulletin
49200-32-45.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 1 of 14

### Page 4 (OCR)

SERVICE BULLETIN 670BA-32-023
Production:  There is no production effectivity.
Service Bulletin:  CL-600-2D15 Canadair Regional Jet (CRJ) and
CL-600-2D24 Canadair Regional Jet (CRJ)
Aircraft with the component part number that
follows installed:
PART NUMBER:  P/N 49203-5
Installed at the time  15001 thru 15154
of delivery on
aircraft serial
numbers:
Spares:  Examine all spare parts. If a part, with a part
number listed above, is tound, it is necessary to
incorporate Goodrich Service Bulletin
49200-32-45.
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 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.
B. Reason
(1) Condition
It is possible to have corrosion or damage to the protective coating on the
piston/axle of the Main Landing Gear (MLG). This is caused by fretting
between the inboard axle sleeve and the axle thrust face and can cause the
axle to break from the piston/axle.
(2) Evidence
There were two reports of in-service aircraft that had a broken piston/axle
on the MLG.
(3) Objective/Benefit
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 2 of 14

### Page 5 (OCR)

SERVICE BULLETIN 670BA-32-023
This service bulletin gives the procedure to do a visual inspection of the
piston/axle of the MLG. It also gives the procedure to repair the piston/axle
of the MLG. This will prevent possible damage to the piston/axle.
C. Description
The lockpins are installed in the MLG. The hydraulic pressure is released. Circuit
breakers are opened. The aircraft is lifted at the MLG. The brake unit assembly is
removed. The wheel speed transducer is removed.
Goodrich Service Bulletin 49200-32-45 is done.
The brake unit assembly is installed. The wheel speed transducer is installed.
The aircraft is lowered. The circuit breakers are closed. The hydraulic systems
are pressurized. The brakes are bled. An operational test of the brake system is
done. An operational test of the brake-temperature monitoring system is done.
An operational test of the anti-skid control system is done. The lockpins are
removed from the MLG.
D. Compliance
Recommended Service Bulletin.
For Aircraft that have not incorporated REO 670-32-11-226, 670-32-11-231,
670-32-11-233, 670-32-11-234, 670-32-11-235 initial issue and subsequent revisions,
670-32-11-236 thru 670-32-11-240, 670-32-11-242 thru 670-32-11-245,
670-32-11-246A, 670-32-11-247A, 670-32-11-248 thru 670-32-11-255, 670-32-11-257
thru 670-32-11-263 or 670-32-11-266
Bombardier Aerospace recommends that this service bulletin be done within 12
months from the release date on this service bulletin for Piston/Axle that have 48
months or more since the entry into service, unless otherwise directed by the
airworthiness authority of the operator.
Bombardier Aerospace recommends that this service bulletin be done within 24
months from the release date on this service bulletin for Piston/Axle that have 24
months or more and less than 48 months since the entry into service, unless
otherwise directed by the airworthiness authority of the operator.
Bombardier Aerospace recommends that this service bulletin be done within 36
months from the release date on this service bulletin for Piston/Axle that have
less than 24 months since the entry into service, unless otherwise directed by the
airworthiness authority of the operator.
Bombardier Aerospace recommends that this service bulletin be repeated every
30 months from the initial inspection date unless otherwise directed by the
airworthiness authority of the operator.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 3 of 14

### Page 6 (OCR)

SERVICE BULLETIN 670BA-32-023
For Aircraft that have incorporated REO 670-32-11-226, 670-32-11-231, 670-32-11-233,
670-32-11-234, 670-32-11-235 initial issue and subsequent revisions, 670-32-11-236 thru
670-32-11-240, 670-32-11-242 thru 670-32-11-245, 670-32-11-246A, 670-32-11-247A,
670-32-11-248 thru 670-32-11-255, 670-32-11-257 thru 670-32-11-263 or
670-32-11-266
Bombardier Aerospace recommends that this service bulletin be done every 30
months from the date the aircraft have incorporated the REO: 670-32-11-226,
670-32-11-231, 670-32-11-233, 670-32-11-234, 670-32-11-235 initial
issue and subsequent revisions, 670-32-11-236 thru 670-32-11-240,
670-32-11-242 thru 670-32-11-245, 670-32-11-246A, 670-32-11-247A,
670-32-11-248 thru 670-32-11-255, 670-32-11-257 thru 670-32-11-263 or
670-32-11-266.
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.
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 22.0 man-hours to complete this service bulletin. The
man-hours are divided as shown in the table that follows:
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 4 of 14

### Page 7 (OCR)

SERVICE BULLETIN 670BA-32-023
TASK  MAN-HOURS
(1) Job Set-Up  5.0
(2) Procedure  8.0
(3) Test  2.0
(4) Job Close-Out  7.0
NOTE: This estimate does not include the man-hours necessary to replace
damaged parts. Add 4.0 hours for each piston/axle replaced.
NOTE: This estimate includes the man-hours necessary to do Goodrich
Service Bulletin 49200-32-45.
NOTE: This estimate does not include the man-hours necessary to do the
GREO 670-32-11-235. Add 22.0 hours to do the repair on each MLG.
Bombardier Aerospace does not cover the labor costs to do this service bulletin.
G. Material - Price and Availability
There are no kits for this service bulletin.
(1) 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.
(1) Refer to paragraph 3.C. for a list of special tools and equipment for this
service bulletin.
. Weight and Balance
Not changed.
J. Electrical Load Data
Not changed.
K. References
- Restriction and/or Special Instruction (RSI), C-32-1026-00, Revision E.
- Repair Engineering Order (REO) 670-32-11-235, Revision D.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 5 of 14

### Page 8 (OCR)

SERVICE BULLETIN 670BA-32-023
- Goodrich Service Bulletin 49200-32-45 Revision 1, dated Aug 29/07.
- Aircraft Maintenance Manual (AMM), CSP B-001, Revision 24.
- For Bombardier Aerospace reference only: PCA 72855.
L. Other Publications Affected
None.
M. Relationship Chart
Not applicable.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 6 of 14

### Page 9 (OCR)

SERVICE BULLETIN 670BA-32-023
2. ACCOMPLISHMENT INSTRUCTIONS
A. Job Set-Up
(1) Reference Information
REFERENCE
AMM 07-12-01-582-801
AMM 07-12-01-586-801
AMM 10-11-00-000-802
AMM 10-11-00-400-802
AMM 12-00-00-867-801
AMM 12-00-06-862-801
AMM 12-00-06-862-802
AMM 12-00-06-862-803
AMM 12-00-06-862-804
AMM 24-00-00-910-801
AMM 32-43-00-710-801
AMM 32-43-00-870-801
AMM 32-43-26-000-801
AMM 32-43-26-400-801
DESIGNATION
Jacking at the Main Landing Gear
(MLG)
Lowering at the Main Landing Gear
(MLG)
Removal of the Main Landing Gear
(MLG) Lockpins
Installation of the Main Landing
Gear (MLG) Lockpins
Standard Aircraft Configuration for
Maintenance
Pressurize Hydraulic System No. 1
and No. 2
Release Hydraulic Pressure of
System No. 1 and No. 2
Pressurize Hydraulic System No. 3
Release Hydraulic Pressure of
System No.3
Electrical/Electronic Safety
Precautions
Operational Test of the Brake
System
Bleeding of the Brakes
Removal of the Brake Unit
Assembly
Installation of the Brake Unit
Assembly
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 7 of 14

### Page 10 (OCR)

SERVICE BULLETIN 670BA-32-023
REFERENCE  DESIGNATION
AMM 32-44-00-710-801  Operational Test of the Anti-Skid
Control System
AMM 32-44-01-000-801  Removal of the Wheel Speed
Transducer
AMM 32-44-01-400-801  Installation of the Wheel Speed
Transducer
AMM 32-46-00-710-801  Operational Test of the
Brake-Temperature Monitoring
System
(2) Make sure that the aircraft is in standard configuration for maintenance
(AMM 12-00-00-867-801).
(3) Install the MLG lockpins (AMM 10-11-00-400-802).
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.
(4) Obey all the electrical/electronic safety precautions (AMM
24-00-00-910-801).
WARNING: OBEY ALL HYDRAULIC SAFETY PRECAUTIONS WHEN YOU
DO WORK ON THE HYDRAULIC SYSTEM AND HYDRAULIC
SYSTEM COMPONENTS. YOU CAN CAUSE INJURY TO
PERSONS AND DAMAGE TO THE EQUIPMENT.
(5) Release the hydraulic pressure from hydraulic system No. 2 (AMM
12-00-06-862-802).
(6) Release the hydraulic pressure from hydraulic system No. 3 (AMM
12-00-06-862-804).
(7) Open, safety, and tag the circuit breakers that follow:
CB-PANEL  CB NO.  NAME
CВP-1  F11  HYD SYST AC PUMP CONT 3B
CBP-1  F14  HYD SYST AC PUMP CONT 2
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 8 of 14

### Page 11 (OCR)

SERVICE BULLETIN 670BA-32-023
CB-PANEL  CB NO.  NAME
CBP-1  G2  NOSE STEER
CBP-2  F14  HYD SYST AC PUMP CONT 3A
CBP-2  G2  NOSE STEER
ACPC  ACPC  HYD PUMP 2B
ACPC  ACPC  HYD PUMP 3B
ACPC  ACPC  HYD PUMP 3A
(8) Lift the aircraft at the MLG (AMM 07-12-01-582-801).
(9) Remove the brake unit assembly (AMM 32-43-26-000-801).
(10) Remove the wheel speed transducer (AMM 32-44-01-000-801).
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.
(1) Do a visual inspection of the inboard and outboard piston/axle of the MLG as
follows:
(a) Do Goodrich Service Bulletin 49200-32-45 Section II, Step 1.B. (2),
Step 1.B. (3), Step 1.B. (4) and Step 2.
(b) If corrosion and/or damage of the protective coating is/are not found, do
as follows:
Do Goodrich Service Bulletin 49200-32-45 Section II, Step 3. A.,
Step 3. B. and Step 4.
2  Go to the Job Close-Out.
(c) If corrosion and/or damage of the protective coating is/are found, do as
tollows:
Repair the piston/axle per GREO 670-32-11-235.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 9 of 14

### Page 12 (OCR)

SERVICE BULLETIN 670BA-32-023
2 Do Goodrich Service Bulletin 49200-32-45 Section II, Step 3. A.,
Step 3. B. and Step 4.
(d) Record the data and send the Appendix A to the Bombardier Customer
Response Center (CRC).
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 10 of 14

### Page 13 (OCR)

SERVICE BULLETIN 670BA-32-023
WHEEL
BRAKE UNIT
SPEED
TRANSDUCER
OUTBOARD
AXLE SLEEVE
INBOARD
AXLE SLEEVE  ba4774a01.cgm, Ir. jul19/2007
Piston/Axle Assembly
Figure 1
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 11 of 14

### Page 14 (OCR)

SERVICE BULLETIN 670BA-32-023
C. Job Close-Out
(1) Remove all tools, equipment, and unwanted materials from the work area.
(2) Install the wheel speed transducer (AMM 32-44-01-400-801).
(3) Install the brake unit assembly (AMM 32-43-26-400-801).
(4) Lower the aircraft (AMM 07-12-01-586-801).
(5) 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-1  F14  HYD SYST AC PUMP CONT 2
CВP-1  G2  NOSE STEER
CBP-2  F14  HYD SYST AC PUMP CONT 3A
CBP-2  G2  NOSE STEER
ACPC  ACPC  HYD PUMP 2B
ACPC  ACPC  HYD PUMP 3B
ACPC  ACPC  HYD PUMP 3A
(6) Pressurize hydraulic system No. 2 (AMM 12-00-06-862-801).
(7) Pressurize hydraulic system No. 3 (AMM 12-00-06-862-803).
(8) Bleed the brake unit (AMM 32-43-00-870-801).
(9) Do the operational test of the brake system (AMM 32-43-00-710-801).
(10) Do the operational test of the brake-temperature monitoring system (AMM
32-46-00-710-801).
(11) Do the operation test of the anti-skid control system (AMM
32-44-00-710-801).
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 12 of 14

### Page 15 (OCR)

SERVICE BULLETIN 670BA-32-023
(12) Remove the lockpins from the MLG (AMM 10-11-00-000-802).
(13) When this service bulletin is completed, make this entry in the applicable
logbook as follows: "Service Bulletin 670BA-32-023, Revision C, Landing
Gear - Main Landing Gear - Inspection of the Piston/Axle P/N 49203-3 and
P/N 49203-5, incorporated."
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 13 of 14

### Page 16 (OCR)

SERVICE BULLETIN 670BA-32-023
3. MATERIAL INFORMATION
A. Kit Information
None.
B. Consumable Information
For a list of consumables, refer to the different tasks, the repair procedure and the
Goodrich service bulletin given as references in this service bulletin.
C. Special Tools and Equipment
For a list of special tools and equipment, refer to the different tasks, the repair
procedure and the Goodrich service bulletin given as references in this service
bulletin.
D. Disposition of Parts
Not applicable.
Oct 24/2007  S.B. 670BA-32-023
Revision C, Jan 29/2009  Page 14 of 14

### Page 17 (OCR)

BOMBARDIER
DATA SHEET
The data sheet contained in this appendix is given as references in the
ACCOMPLISHMENT INSTRUCTIONS of Service Bulletin 670BA-32-023
Oct 24/2007  APPENDIX A
Revision B, Mar 05/2008  Page A1 of A3

### Page 18 (OCR)

Appendix A
Inspection of the Piston/Axle P/N 49203-3 and P/N 49203-5
Left  Right
Inspection date :
Operator :
A/C Model :
A/C Serial Number :
Piston/Axle Part Number :
Piston/Axle Serial Number :
Piston/Axle (Cycles Since New) :
Piston/Axle (Time Since New) :
Was there corrosion or damage to the protective coating on the Piston/Axle if yes, identify
on which piston axle it was found.
LH Inboaro  Outboard
RH Inboard  Outboard
If GREO 670-32-11-235 (Rev B or later) was incorporated, give the dimensions after repair
as shown in Figure 1:
Inboard Axle  Outboard Axle
• LH For Part Number 49203-3 :
• LH For Part Number 49203-5 :
• RH For Part Number 49203-3 :
• RH For Part Number 49203-5 :
Oct 24/2007  APPENDIX A
Revision B, Mar 05/2008  Page A2 of A3

### Page 19 (OCR)

Appendix A
MLG Piston Axle P/N
49203-3
(REF)  (91.69 mm)  Min. 3.610 in.
MLG Piston Axle P/N
49203-5
(REF)  (92.33 mm)  Min. 3.635 in.
Figure 1
Record the data and send this Appendix to the Customer Response Center (CRC)
E-mail: thd.crj thd.crj@aero.bombardier.com
Fax: 1-514-855-8501
Oct 24/2007  APPENDIX A
Revision B, Mar 05/2008  Page A3 of A3

### Page 20 (OCR)

BOMBARDIER
SERVICE BULLETIN EVALUATION FORM/COMPLIANCE SHEET
(YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS)
SERVICE BULLETIN: :670BA-32-023  ISSUE: C
STRONGLY  DISAGREE NEUTRAL  AGREE  STRONGLY
DISAGREE  AGREE
• Instructions to do the Service Bulletin  •  •  •  •
were accurate.
Comments:
• lustration(s), figure(s), picture(s) and/or
kit drawing(s) were helpful to carry out
instructions.
Comments:
• If a parts kit was required, did the kit  •
contents received agree with the
contents listed in the bulletin?
Comments:
• Aircraft hands-on work was  •
accomplished in estimated time.
Comments:
• Overall, I was satisfied with this Service
Bulletin.
Comments:
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
THANK YOU FOR ANSWERING THIS EVALUATION FORM
UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO
450-476-7300

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