# Bombardier Service Bulletin 670BA-32-060

Copy: Revision B ("670BA-32-060B"), 25 pages: PDF https://openairdocs.org/files/sha256/5c/46/5c4628abe7c132c5ce3ee7dd1e3240676eb1bd3829c1129f8211cd39beb747c1; text https://openairdocs.org/service-documents/bombardier/670ba-32-060/file/5c4628abe7c1.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2018-0275; AD 2018-14-03 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-32-060
- Latest revision known: 670BA-32-060, Revision B, dated November 10, 2017 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/670ba-32-060

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

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

- [AD 2018-14-03](https://openairdocs.org/ad/2018-14-03.md), effective Aug 13, 2018: Revisions A and B

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/670ba-32-060/proposed.md).

## Text (25 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2018-0275; AD 2018-14-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

the evolution of mobility
SB 670BA- - - 32- - - 060
Page 1 of 1
Nov 10/2017
SERVICE BULLETIN
REVISION TRANSMITTAL SHEET
SERVICE BULLETIN 670BA - - -32 - - -060
SUBJECT : Landing Gear - - - Landing Gear Hydraulic Extension/Retraction - - -
Inspection of the Main Landing Gear (MLG) Retract Actuator Bracket and
Related Pins
This Page transmits:
Revision B of Service Bulletin 670BA- - - 32- - - 060, dated Nov 10/2017.
For Aircraft that have had PART A of the initial issue of this service
bulletin incorporated, it is necessary to make sure that the title en-
tered in the logbook contains the words Revision NC and PART A.
For Aircraft that have had PART B of the initial issue of this service
bulletin incorporated, it is necessary to make sure that the title en-
tered in the logbook contains the words Revision NC and PART B.
The changes in this revision have no effect on aircraft that have had
PART A and/or PART B of revision A of this service bulletin incorpo-
rated.
Reason:
Revised Accomplishment Instructions, paragraph 2., to:
Add a step to repair the pins.
Change service bulletin incorporation statement.
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- - - 060 Revision A, dated Jun 22/2017.
Replace with the copy attached.
Service Bulletin History:
Initial issue, dated May 02/2017
Revision A, dated Jun 22/2017
1

### Page 2

the evolution of mobility
SB 670BA- - - 32- - - 060
Page 1 of 24
May 02/2017
Revision B, Nov 10/2017
SERVICE BULLETIN
T echnical
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- - -32 NUMBER: 670BA - - -32- - -060
SUBJECT : Landing Gear - - - Landing Gear Hydraulic Extension/Retraction - - -
Inspection of the Main Landing Gear (MLG) Retract Actuator Bracket and
Related Pins
1. PLANNING INFORMATION
A. Effectivity
(1) Aircraft with the components that follow installed:

### Page 3

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 2 of 24
May 02/2017
Revision B, Nov 10/2017
PART NUMBER: LH 49000- - - 25/- - - 33/- - - 37/- - - 41/- - - 45RH 49000- - - 26/- - - 34/- - - 38/- - - 42/- - - 46
PART SERIAL
NUMBERS:
LH MA0335, MA0343 - - - MA0429, MA0433 - - -
MA0449, MA0453, MA0459 - - - MA0471,
MA0475, MA0481 - - - MA0485, MA0489,
MA0493, MA0495, MA0499 - - - MA0505,
MA0509 - - - MA0523
PART SERIAL
NUMBERS:
RH MA0336, MA0344 - - - MA0430, MA0434 - - -
MA0450, MA0454, MA0460 - - - MA0472,
MA0476, MA0482 - - - MA0486, MA0490,
MA0494, MA0496, MA0500 - - - MA0506,
MA0510 - - - MA0524
SPARES:
Examine all spare parts. If a part with a serial
number listed above is found, it is necessary
to incorporate Service Bulletin.
ALL CL - - -600 - - -2C10
AIRCRAFT
If parts with the serial numbers listed above
are installed on aircraft, but were not
identified at the time of delivery, on the same
or on a different aircraft model, it is necessary
to incorporate Service Bulletin
670BA- - - 32- - - 060
INSTALLED AT THE
TIME OF DELIVERY
ON CL - - -600 - - -2C10
AIRCRAFT SERIAL
NUMBERS:
10265 thru 10345
PRODUCTION:
Aircraft 10346 and subsequent serial will
have this change incorporated before
delivery.

### Page 4

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 3 of 24
May 02/2017
Revision B, Nov 10/2017
PART NUMBER: LH 49050- - - 11/- - - 13/- - - 15/- - - 17/- - - 19/- - - 21RH 49050- - - 12/- - - 14/- - - 16/- - - 18/- - - 20/- - - 22
PART SERIAL
NUMBERS:
LH MA1235 - - - MA1501, MA1505, MA1507,
MA1511 - - - MA1515, MA1519, MA1523 - - -
MA1541, MA1544 - - - MA1548, MA1552 - - -
MA1556, MA1560 - - - MA1566, MA1569,
MA1573, MA1580 - - - MA1802, MA1806 - - -
MA1855
PART SERIAL
NUMBERS:
RH MA1236 - - - MA1502, MA1506, MA1508,
MA1512 - - - MA1516, MA1520, MA1522,
MA1526 - - - MA1542, MA1545 - - - MA1549,
MA1553 - - - MA1557, MA1561 - - - MA1565,
MA1568, MA1570, MA1574, MA1581 - - -
MA1856
SPARES:
Examine all spare parts. If a part with a serial
number listed above is found, it is necessary
to incorporate Service Bulletin.
ALL CL - - -600 - - -2D24
and CL - - -600 - - -2D15
AIRCRAFT
If parts with the serial numbers listed above
are installed on aircraft, but were not
identified at the time of delivery, on the same
or on a different aircraft model, it is necessary
to incorporate Service Bulletin
670BA- - - 32- - - 060
INSTALLED AT THE
TIME OF DELIVERY
ON CL - - -600 - - -2D24
and CL - - -600 - - -2D15
AIRCRAFT SERIAL
NUMBERS:
15118 thru 15417
PRODUCTION:
Aircraft 15418 and subsequent serial
numbers,will have this change incorporated
before delivery.

### Page 5

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 4 of 24
May 02/2017
Revision B, Nov 10/2017
PART NUMBER: LH 55000- - - 1RH 55000- - - 2
PART SERIAL
NUMBERS:
LH SPP010001, SPP010004 - - - SPP010041,
SPC012003 - - - SPC012010
PART SERIAL
NUMBERS:
RH SPP015001, SPP015004 - - - SPP015041,
SPC017002, SPC017004 - - - SPC017010
SPARES:
Examine all spare parts. If a part with a serial
number listed above is found, it is necessary
to incorporate Service Bulletin.
ALL CL - - -600 - - -2E25
AIRCRAFT
If parts with the serial numbers listed above
are installed on aircraft, but were not
identified at the time of delivery, on the same
or on a different aircraft model, it is necessary
to incorporate Service Bulletin
670BA- - - 32- - - 060
INSTALLED AT THE
TIME OF DELIVERY
ON CL - - -600 - - -2E25
AIRCRAFT SERIAL
NUMBERS:
19001 thru 19048
PRODUCTION:
Aircraft 19049 and subsequent serial
numbers, will have this change incorporated
before delivery.
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.

### Page 6

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 5 of 24
May 02/2017
Revision B, Nov 10/2017
B. Reason
(1) Condition
Corrosion on the MLG retraction actuator bracket, Outer Cylinder lugs and the
related pins can cause the MLG to extend incorrectly.
(2) Evidence
The condition was found in- - -service.
(3) Objective/Benefit
This service bulletin gives the procedure to inspect the MLG retract actuator
bracket, Outer Cylinder lugs and the related pins for corrosion. Replace MLG
retract Actuator bracket and/or Outer Cylinder if corrosion is found. If
corrosion found on related pins they are repaired or replaced and corrosion
protection is re- - -applied.
C. Description
This service bulletin is divided into two parts: PART A and PART B.
PART A - - - Inspection of the Left MLG Retract Actuator Bracket, Outer Cylinder
lugs and related pins
The aircraft is put on jacks. The retract actuator bracket is removed from the left
MLG. The bracket, outer cylinder lugs and related pins are inspected for corrosion.
If corrosion is found on the bracket and/or outer cylinder they are replaced. If
corrosion is found on a pin(s), the pin(s) is/are repaired and/or replaced. The
retract actuator bracket is installed and corrosion protection is re- - -applied. The
aircraft is lowered.
PART B - - - Inspection of the Right MLG Retract Actuator Bracket, Outer
Cylinder lugs and related pins
The aircraft is put on jacks. The retract actuator bracket is removed from the right
MLG. The bracket, Outer Cylinder lugs and related pins are inspected for
corrosion. If corrosion is found on the bracket and/or Outer Cylinder they are
replaced. If corrosion is found on a pin(s), the pin(s) is/are repaired and/or
replaced. The retract actuator bracket is installed and corrosion protection is
re- - -applied. The aircraft is lowered.

### Page 7

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 6 of 24
May 02/2017
Revision B, Nov 10/2017
D. Compliance
Recommended service bulletin.
Bombardier recommends that this service bulletin be done as shown in one of the
tables below, unless otherwise directed by the airworthiness authority of the
operator.
Ta b l e 1
For MLG Dressed Shock Struts Compliance
with less than 10000 flight hours
A N Dw i t hl e s st h a n6 0m o n t h ss i n c e
the entry into service
at no more than 6600 flight hours or 39
months from the release date on the
initial issue of this service bulletin,
whichever comes first
Ta b l e 2
For MLG Dressed Shock Struts Compliance
that do not meet the criteria in T able
1 and with less than or equal to
14000 flight hours AND with less
than 84 months since the entry into
service
at no more than 4400 flight hours or 26
months from the release date on the
initial issue of this service bulletin,
whichever comes first, or before the
MLG dressed shock strut has 16600
flight hours or 99 months since the
entry into service, whichever comes
first
Ta b l e 3
For MLG Dressed Shock Struts Compliance
with more than14000 flight hours
OR with 84 months or more since
the entry into service
at no more than 2600 flight hours or 15
months from the release date on the
initial issue of this service bulletin,
whichever comes first

### Page 8

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 7 of 24
May 02/2017
Revision B, Nov 10/2017
It is not necessary to do this service bulletin if the applicable MLG Dressed Shock
Strut(s) meet one of the conditions that follow:
Condition 1:
The following tasks were accomplished on the MLG Dressed Shock Strut since
entry into service:
--- A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 3 o r e q u i v a l e n t t a s k i n C M M 3 2 --- 1 1 --- 0 5 o r C M M
3 2 --- 1 1 --- 0 6 o r C M M 3 2 --- 1 1 --- 3 4 a n d
--- A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 4 o r e q u i v a l e n t t a s k i n C M M 3 2 --- 1 1 --- 0 5 o r C M M
3 2 --- 1 1 --- 0 6 o r C M M 3 2 --- 1 1 --- 3 4 a n d
--- A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 5 o r A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 1 o r A M M
3 2 --- 1 1 --- 0 5 --- 4 0 0 --- 8 0 1 a n d
--- A M M 3 2 --- 3 2 --- 0 3 --- 4 0 0 --- 8 0 1 o r A M M 3 2 --- 1 1 --- 0 5 --- 4 0 0 --- 8 0 1 ( A p p l i c a b l e o n l y f o r
CL- - - 600- - - 2C10, CL- - - 600- - - 2D15 and CL- - - 600- - - 2D24 equipped with Auxiliary
Actuators)
Condition 2:
The following task was accomplished on the MLG Dressed Shock Strut since entry
into service:
--- A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 6
Condition 3:
The MLG assembly has been overhauled:
--- A M M 3 2 --- 1 1 --- 0 0 --- 6 1 0 --- 8 0 1
NOTE: The titles of the AMM task in Conditions 1 thru 3 are as follows:
--- A M M 3 2 --- 3 2 --- 0 3 --- 4 0 0 --- 8 0 1
Installation of the MLG Auxiliary Actuator
- - - AMM 32- - - 32- - - 05- - - 400- - - 803:
Installation of the Outboard MLG Retraction Actuator Bracket Pin
- - - AMM 32- - - 32- - - 05- - - 400- - - 804:
Installation of the Inboard MLG Retraction Actuator Bracket Pin
- - - AMM 32- - - 32- - - 05- - - 400- - - 805:
Installation of the Inboard MLG Retraction Actuator Pin
- - - AMM 32- - - 32- - - 05- - - 400- - - 801:
Installation of the MLG Retraction Actuator
- - - AMM 32- - - 32- - - 05- - - 400- - - 806:

### Page 9

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 8 of 24
May 02/2017
Revision B, Nov 10/2017
Installation of the MLG Retraction Actuator Bracket
- - - AMM 32- - - 11- - - 00- - - 610- - - 801:
Restoration (Overhaul) of the Main Landing Gear Assembly.
- - - AMM 32- - - 11- - - 05- - - 400- - - 801:
Installation of the MLG Shock- - -Strut Assembly
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 in the CRC at 1- - - 844- - - 272- - - 2720 (1- - - 844- - - CRC - - - CRC0)
or 1- - - 514- - - 855- - - 8500 or e-mail at thd.crj@aero.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
T olerance 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. M a n p o w e r
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 an estimate. Call the Fleet Services Team through the
CRC at 1- - - 844- - - 272- - - 2720 (1- - - 844- - - CRC - - - CRC0) or 1- - - 514- - - 855- - - 8500 or
e-mail at thd.crj@aero.bombardier.com.

### Page 10

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 9 of 24
May 02/2017
Revision B, Nov 10/2017
FOR PART A
It will take an estimated 8.0 man-hours to complete PART A of 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 2.0
(2) Procedure 3.0
(3) T est 1.0
(4) Job Close-Out 2.0
FOR PART B
It will take an estimated 8.0 man-hours to complete PART B of 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 2.0
(2) Procedure 3.0
(3) T est 1.0
(4) Job Close-Out 2.0
G. Material - - - Price and Availability
There are no kits for this service bulletin.
H. T ooling - - - 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.

### Page 11

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 10 of 24
May 02/2017
Revision B, Nov 10/2017
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- - -1736- - -00, Revision C
For Bombardier reference only: PCR 76622
L. Other Publications Affected
Aircraft Maintenance Manual (AMM)
M. Relationship Chart
Not applicable.

### Page 12

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 11 of 24
May 02/2017
Revision B, Nov 10/2017
2. ACCOMPLISHMENT INSTRUCTIONS
PART A - - - Inspection of the Left MLG Retract Actuator Bracket, Outer Cylinder lugs and
related pins
Reference Information
REFERENCE DESIGNATION
A M M 0 7 --- 1 1 --- 0 1 --- 5 8 2 --- 8 0 1 Jacking of the Aircraft
A M M 1 2 --- 0 0 --- 0 0 --- 8 6 7 --- 8 0 1Standard Aircraft Configuration for Maintenance
A M M 2 4 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 1Electrical/Electronic Safety Precautions
A M M 2 9 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 1 Hydraulic Safety Precautions
A M M 2 9 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 2 Hydraulic T echnical Precautions
A M M 3 2 --- 1 1 --- 0 5 --- 0 0 0 --- 8 0 3Removal of the MLG Shock Strut Outer Cylinder
A M M 3 2 --- 1 1 --- 0 5 --- 4 0 0 --- 8 0 3Installation of the MLG Shock Strut Outer Cylin-
der
A M M 3 2 --- 3 2 --- 0 5 --- 0 0 0 --- 8 0 6R e m o v a lo ft h eM L GR e t r a c t i o n - - - A c t u a t o r
Bracket
A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 6Installation of the MLG Retraction- - -Actuator
Bracket
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.
(1) Make sure that the aircraft is in standard configuration for maintenance (refer
to AMM 12- - - 00- - - 00- - - 867- - - 801).
(2) Obey all the electrical/electronic safety precautions (refer to AMM
24- - - 00- - - 00- - - 910- - - 801).
(3) Obey all the hydraulic safety precautions (refer to AMM
29- - - 00- - - 00- - - 910- - - 801).

### Page 13

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 12 of 24
May 02/2017
Revision B, Nov 10/2017
(4) Obey all the hydraulic technical precautions (refer to AMM
29- - - 00- - - 00- - - 910- - - 802).
(5) Make sure there is a warning tag on the landing gear control- - - lever.
(6) Lift the aircraft on jacks (refer to AMM 07- - - 11- - - 01- - - 582- - - 801).
(7) Remove the MLG Retraction- - -Actuator bracket (refer to AMM
32- - - 32- - - 05- - - 000- - - 806).
B. Procedure
Refer to Figure 1 (1 of 3)
For Aircraft 10001 - - - 10270, 15001 - - - 15211
(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
Bombardier in the CRC at 1- - - 844- - - 272- - - 2720 (1- - - 844- - - CRC - - - CRC0) or
1- - - 514- - - 855- - - 8500 or e-mail at thd.crj@aero.bombardier.com for analysis
and to get an approved disposition to complete this service bulletin.
(2) Do the inspection on pins (4),(5),(8) and (12) for sign of corrosion:
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), and/or (12),
do GREO 670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), and/or (12) cannot be repaired
with GREO 670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(3) Do the inspection on nuts (2),(6),(9) and (15), washers (3),(7),(10) and (14)
a n ds l e e v e( 1 3 )f o re v i d e n c eo fc o r r o s i o n :
(a) Replace nut, washer and sleeve with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806)
(4) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer
to section 3 if inspection reveals evidence of corrosion.

### Page 14

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 13 of 24
May 02/2017
Revision B, Nov 10/2017
(5) Do the inspection on outer cylinder lugs (11) mating with Retraction- - -Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly (refer to
AMM 32- - - 11- - - 05- - - 400- - - 803).
Refer to Figure 1 (2 of 3)
For Aircraft 10271 - - - 10999, 15212 - - - 15990
(6) Do the inspection on pins (4),(5) and (8) for sign of corrosion:
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), do GREO
670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), cannot be repaired with GREO
670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(7) Do the inspection on nuts (2),(6),(9), washers (3),(7) and (10) for evidence of
corrosion:
(a) Replace nut and washer with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806)
(8) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer
to section 3 if inspection reveals evidence of corrosion.

### Page 15

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 14 of 24
May 02/2017
Revision B, Nov 10/2017
(9) Do the inspection on outer cylinder lugs (11) mating with Retraction- - -Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly (refer to
AMM 32- - - 11- - - 05- - - 400- - - 803).
Refer to Figure 1 (3 of 3)
For Aircraft 19001 - - - 19250
(10) Do the inspection on pins (4),(5) and (8) for sign of corrosion:
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), do GREO
670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), cannot be repaired with GREO
670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(11) Do the inspection on nuts (2),(6), and (9), washers (3),(7) and (10) for
evidence of corrosion:
(a) Replace nut and washer with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806)
(12) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer
to section 3 if inspection reveals evidence of corrosion.

### Page 16

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 15 of 24
May 02/2017
Revision B, Nov 10/2017
(13) Do the inspection on outer cylinder lugs (11) mating with Retraction- - - Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly (refer to
AMM 32- - - 11- - - 05- - - 400- - - 803).
C. Job Close-Out
NOTE: The steps in the Job Close-Out section of this service bulletin, except for
the return-to-service tests, are recommended steps. The steps give a
recommendation to install components removed during the Job Set-Up.
This recommendation is to make sure that the aircraft is safe and ready
to return to service. Alternative steps can be used at the operator
discretion.
(1) Install the MLG Retraction- - -Actuator bracket (refer to AMM
32- - - 32- - - 05- - - 400- - - 806).
(2) Remove all tools, equipment, and unwanted materials from the work area.
(3) When PART A of this service bulletin is completed, make this entry in the
applicable logbooks: “Service Bulletin 670BA- - - 32- - - 060, Revision B, Landing
Gear - - - Landing Gear Hydraulic Extension/Retraction - - - Inspection of the
Main Landing Gear (MLG) Retract Actuator Bracket and Related Pins,
PART A, incorporated.”

### Page 17

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 16 of 24
May 02/2017
Revision B, Nov 10/2017
PART B - - - Inspection of the Right MLG Retract Actuator Bracket, Outer Cylinder lugs
and related pins
Reference Information
REFERENCE DESIGNATION
A M M 0 7 --- 1 1 --- 0 1 --- 5 8 2 --- 8 0 1 Jacking of the Aircraft
A M M 1 2 --- 0 0 --- 0 0 --- 8 6 7 --- 8 0 1Standard Aircraft Configuration for Maintenance
A M M 2 4 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 1Electrical/Electronic Safety Precautions
A M M 2 9 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 1 Hydraulic Safety Precautions
A M M 2 9 --- 0 0 --- 0 0 --- 9 1 0 --- 8 0 2 Hydraulic T echnical Precautions
A M M 3 2 --- 1 1 --- 0 5 --- 0 0 0 --- 8 0 3Removal of the MLG Shock Strut Outer Cylinder
A M M 3 2 --- 1 1 --- 0 5 --- 4 0 0 --- 8 0 3Installation of the MLG Shock Strut Outer Cylin-
der
A M M 3 2 --- 3 2 --- 0 5 --- 0 0 0 --- 8 0 6R e m o v a lo ft h eM L GR e t r a c t i o n - - - A c t u a t o r
Bracket
A M M 3 2 --- 3 2 --- 0 5 --- 4 0 0 --- 8 0 6Installation of the MLG Retraction- - -Actuator
Bracket
D. 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.
(1) Make sure that the aircraft is in standard configuration for maintenance (refer
to AMM 12- - - 00- - - 00- - - 867- - - 801).
(2) Obey all the electrical/electronic safety precautions (refer to AMM
24- - - 00- - - 00- - - 910- - - 801).
(3) Obey all the hydraulic safety precautions (refer to AMM
29- - - 00- - - 00- - - 910- - - 801).
(4) Obey all the hydraulic technical precautions (refer to AMM
29- - - 00- - - 00- - - 910- - - 802).

### Page 18

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 17 of 24
May 02/2017
Revision B, Nov 10/2017
(5) Make sure there is a warning tag on the landing gear control- - - lever.
(6) Lift the aircraft on jacks (refer to AMM 07- - - 11- - - 01- - - 582- - - 801).
(7) Remove the MLG Retraction- - -Actuator bracket (refer to AMM
32- - - 32- - - 05- - - 000- - - 806).
E. Procedure
Refer to Figure 1 (1 of 3)
For Aircraft 10001 - - - 10270, 15001 - - - 15211
(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
Bombardier in the CRC at 1- - - 844- - - 272- - - 2720 (1- - - 844- - - CRC - - - CRC0) or
1- - - 514- - - 855- - - 8500 or e-mail at thd.crj@aero.bombardier.com for analysis
and to get an approved disposition to complete this service bulletin.
(2) Do the inspection on pins (4),(5),(8) and (12) for sign of corrosion:
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), and/or (12),
do GREO 670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), and/or (12) cannot be repaired
with GREO 670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(3) Do the inspection on nuts (2),(6),(9) and (15), washers (3),(7),(10) and (14)
a n ds l e e v e( 1 3 )f o re v i d e n c eo fc o r r o s i o n :
(a) Replace nut, washer and sleeve with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806)
(4) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer

### Page 19

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 18 of 24
May 02/2017
Revision B, Nov 10/2017
to section 3 if inspection reveals evidence of corrosion.
(5) Do the inspection on outer cylinder lugs (11) mating with Retraction- - -Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly (refer to
AMM 32- - - 11- - - 05- - - 400- - - 803).
Refer to Figure 1 (2 of 3)
For Aircraft 10271 - - - 10999, 15212 - - - 15990
(6) Do the inspection on pins (4),(5) and (8) for sign of corrosion:
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), do GREO
670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), cannot be repaired with GREO
670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(7) Do the inspection on nuts (2),(6),(9), washers (3),(7) and (10) for evidence of
corrosion:
(a) Replace nut and washer with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806)
(8) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer
to section 3 if inspection reveals evidence of corrosion.
(9) Do the inspection on outer cylinder lugs (11) mating with Retraction- - -Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly
(refer to AMM 32- - - 11- - - 05- - - 400- - - 803).

### Page 20

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 19 of 24
May 02/2017
Revision B, Nov 10/2017
Refer to Figure 1 (3 of 3)
For Aircraft 19001 - - - 19250
(10) Do the inspection on pins (4),(5) and (8) for sign of corrosion.
(a) If corrosion is found on the pin(s) (4), and/or (5), and/or (8), do GREO
670- - - 32- - - 10- - - 020.
(b) If the pin(s) (4), and/or (5), and/or (8), cannot be repaired with GREO
670- - - 32- - - 10- - - 020, replace the pin(s)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(11) Do the inspection on nuts (2),(6), and (9), washers (3),(7) and (10) for
evidence of corrosion:
(a) Replace nut and washer with evidence of corrosion
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
(12) Do the inspection on retract actuator bracket assembly (1) for evidence of
corrosion:
(a) Inspect all bushings contact areas and lugs where retract actuator
bracket assembly mates with actuator pins and outer cylinder lugs.
(b) If corrosion is found, replace retract actuator bracket assembly (1)
(refer to AMM 32- - - 32- - - 05- - - 400- - - 806).
NOTE: For disposition of parts (Pins and Retract Actuator Bracket Assy), refer
to section 3 if inspection reveals evidence of corrosion.
(13) Do the inspection on outer cylinder lugs (11) mating with Retraction- - - Actuator
bracket for evidence of corrosion:
(a) Inspect all bushings contact areas and lugs where outer cylinder mates
with retract actuator bracket assembly lugs and pins.
(b) If corrosion is found, replace MLG outer cylinder assembly
(refer to AMM 32- - - 11- - - 05- - - 400- - - 803).

### Page 21

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 20 of 24
May 02/2017
Revision B, Nov 10/2017
F. J o b C l o s e - O u t
NOTE: The steps in the Job Close-Out section of this service bulletin, except for
the return-to-service tests, are recommended steps. The steps give a
recommendation to install components removed during the Job Set-Up.
This recommendation is to make sure that the aircraft is safe and ready
to return to service. Alternative steps can be used at the operator
discretion.
(1) Install the MLG Retraction- - -Actuator bracket (refer to AMM
32- - - 32- - - 05- - - 400- - - 806).
(2) Remove all tools, equipment, and unwanted materials from the work area.
(3) When PART B of this service bulletin is completed, make this entry in the
applicable logbooks: “Service Bulletin 670BA- - - 32- - - 060, Revision B, Landing
Gear - - - Landing Gear Hydraulic Extension/Retraction - - - Inspection of the
Main Landing Gear (MLG) Retract Actuator Bracket and Related Pins,
PART B, incorporated.”

### Page 22

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 21 of 24
May 02/2017
Revision B, Nov 10/2017
MLG Retraction Actuator Bracket - - - Removal / Installation
F i g u r e1( 1o f3 )
LEGEND
1. Bracket.
2. Nut.
3. Washer.
4. Pin.
5. Pin.
6. Nut.
7. Washer.
8. Pin.
9. Nut.
10. Washer.
11. Outer cylinder lug.
12. Pin.
13. Sleeve bearing.
14. Washer.
15. Nut.
A
A
B
12
13
C
1 BUSHING
(REF)
BUSHING
(REF)
1514
ba8867a01 gb / fp_13 Apr 2017
FOR AIRCRAFT
10001- -10270 & 15001- -15211
3
1
10
4
2
8
9
7
6
B
C
11
BUSHING
(REF)
BUSHING
(REF)
BUSHING
(REF)
BUSHING
(REF)
5

### Page 23

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 22 of 24
May 02/2017
Revision B, Nov 10/2017
MLG Retraction Actuator Bracket - - - Removal / Installation
F i g u r e1( 2o f3 )
ba8867a02 gb / fp_13 Apr 2017
FOR AIRCRAFT
10271- -10999 & 15212- -15990
B
BUSHING
(REF)
1
7
6
BUSHING
(REF)
5
4
3
2
8
10
9
11
BUSHING
(REF)
BUSHING
(REF)
LEGEND
1. Bracket.
2. Nut.
3. Washer.
4. Pin.
5. Pin.
6. Nut.
7. Washer.
8. Pin.
9. Nut.
10. Washer.
11. Outer cylinder lug.

### Page 24

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 23 of 24
May 02/2017
Revision B, Nov 10/2017
MLG Retraction Actuator Bracket - - - Removal / Installation
F i g u r e1( 3o f3 )
ba8867a03 gb / fp_13 Apr 2017
FOR AIRCRAFT
19001- -19250
LEGEND
1. Bracket.
2. Nut.
3. Washer.
4. Pin.
5. Pin.
6. Nut.
7. Washer.
8. Pin.
9. Nut.
10. Washer.
11. Outer cylinder lug.
3
1
10 4
2
8
9
7
6
11
B
5
BUSHING
(REF)
BUSHING
(REF)
BUSHING
(REF)
BUSHING
(REF)

### Page 25

SERVICE BULLETIN 670BA- - -32- - -060
SB 670BA- - - 32- - - 060
Page 24 of 24
May 02/2017
Revision B, Nov 10/2017
3. MATERIAL INFORMATION
A. Kit Information
None.
B. Consumable Information
For a complete list of consumables, refer to the different tasks that are given as
references in this service bulletin.
C. Special T ools and Equipment
There are no special tools and equipment for this service bulletin.
D. Disposition of Parts
Refer to AOM 700- - - 1001
1

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