# Bombardier Service Bulletin 670BA-27-059: U.S. DOT/FAA - Service Information - SB 670BA-27-059 RB

- Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0997; AD 2014-02-01 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Bombardier Service Bulletin 670BA-27-059](https://openairdocs.org/service-documents/bombardier/670ba-27-059.md)
- Title as filed: U.S. DOT/FAA - Service Information - SB 670BA-27-059 RB
- Pages: 28
- PDF: https://openairdocs.org/files/sha256/60/fe/60fe81f4472659db522b6682592395f73259776da1d38d8fbb64cb5f1cb4daca
- Page: https://openairdocs.org/service-documents/bombardier/670ba-27-059/file/60fe81f44726

## Text

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### Page 1

Flight Controls − Rudder Travel Limiting System − Replacement of the Return
Springs of the Rudder Travel Limiter
This page transmits:
Revision B of Service Bulletin 670BA−27−059,
pages 1 thru 26, dated Sep 26/2013.
The changes in this revision have no effect on aircraft that have KDGWKLV
service bulletinLQFRUSRUDWHG.
Reason:
Revised Planning Information, paragraph 1., to:
Change the service bulletin effectivity.
Revised Accomplishment Instructions, paragraph 2., to:
Change a step.
Document Instructions:
Discard the copy of Service Bulletin 670BA−27−059, Revision A, dated Mar 08/2012.
Replace with the copy attached.
Service Bulletin History:
Initial issue, dated Oct 12/2011.
Revision A, dated Mar 08/2012.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 1 of 1
Sep 26/2013
SERVICE BULLETIN
REVISION TRANSMITTAL SHEET
SUBJECT:

### Page 2

Flight Controls − Rudder Travel Limiting System − Replacement of the Return
Springs of the Rudder Travel Limiter
1. PLANNING INFORMATION
A. Effectivity
(1) Aircraft Affected:
Part number: BA670−30000−7969, BA670−93470−9,
BA670−93470−13, BA670−93470−15,
BA670−93470−981, BA670−93470−987,
KBA670−93470−1, KBA670−93470−3,
KBA670−93402−1, KBA670−93402−3 and
KBA670−93402−5, BA670−93470−963,
BA670−93470−979, BA670−93470−2001,
BA670−93470−7.
Installed at the
time of delivery on
CL−600−2C10
aircraft with serial
numbers:
10002 thru 10333
Installed at the
time of delivery on
CL−600−2D24 and
CL−600−2D15
aircraft with serial
numbers:
15001 thru 15285
SERVICE BULLETIN
ATA SYSTEM: 27−25 NUMBER: 670BA−27−059
S.B. 670BA−27−059
Page 1 of 26
Oct 12/2011
Revision B,  Sep 26/2013
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.
SUBJECT:

### Page 3

Spares: Examine all spare parts. If a part listed above is
found, it is necessary to incorporate this service
bulletin.
All CL−600−2C10,
CL−600−2D15,
and
CL−600−2D24,
aircraft
If parts 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 this service bulletin.
Production: This change will be incorporated before delivery on
aircraft with 10334 and subsequent serial numbers,
and15286 and subsequent serial numbers.
NOTE: It is not necessary to do Service Bulletin 670BA−27−055, Flight
Controls − Rudder Travel Limiting System − Inspection of the
Return Springs and the Primary Actuator of the Rudder Travel
Limiter when this service bulletin is done.
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
bulletin, examine all Supplemental Type Certificates (STCs),
Supplemental Type Approvals (STAs) or equivalent action changes
to make sure this bulletin can be completed.
B. Reason
(1) Condition
It is possible for the return springs of the rudder travel limiter to break
because of fatigue or fouling with the casing of the Rudder Travel Limiter.
This can cause a loss of detection of an RTL mechanical disconnect.
(2) Evidence
The return springs broke during an endurance test and show indications of
fouling with the casing of the RTL.
(3) Objective/Benefit
This service bulletin gives the procedure to remove the torsion springs and
the two return springs from the RTL. It also gives the procedure to install
three new return springs on the RTL. This will prevent a break of the return
springs.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 2 of 26
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Revision B,  Sep 26/2013

### Page 4

C. Description
A rigging pin is installed. Circuit breakers are opened. The turnbuckle
autopilot−controls access door and the elevator−quadrant access door are
removed. The primary actuator of the rudder travel limiter is disconnected from
the limiter arm. A detailed inspection of the housing is done.
The torsion and return springs installed on the link assemblies are removed and
discarded. New return springs are installed. The primary actuator of the rudder
travel limiter is connected to the limiter arm. The rudder travel limiter and the
limiter arm are identified.
The rigging pin is removed from the rudder travel limiter. The circuit breakers are
closed. The clearance between the return springs and the primary actuator is
measured.
An operational test of the rudder travel limiter is done. An operational test of the
rudder−control−system is done. An operational test of the spoiler and stabilizer
control−unit backup−modules is done. The turnbuckle autopilot−controls access
door and the elevator−quadrant access door are installed.
D. Compliance
Recommended Service Bulletin.
For aircraft that have an RTL with part
number KBA670−93470−1 or
BA670−93470−9 or
KBA670−93470−3, or
BA670−93470−981 or
BA670−30000−7969 or
BA670−93470−987 or
BA670−93470−13 or
BA670−93470−963 or
BA670−93470−979 or
BA670−93470−2001 or
BA670−93470−7 installed and that
have 15400 flight cycles or more [1],
[2], [3].
Bombardier recommends that this
service bulletin be done no more than
2000 flight cycles from the release
date on this service bulletin, unless
otherwise directed by the
airworthiness authority of the operator
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 3 of 26
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Revision B,  Sep 26/2013

### Page 5

For aircraft that have an RTL with part
number KBA670−93470−1 or
BA670−93470−9 or
KBA670−93470−3, or
BA670−93470−981 or
BA670−30000−7969 or
BA670−93470−987 or
BA670−93470−13 or
BA670−93470−963 or
BA670−93470−979 or
BA670−93470−2001 or
BA670−93470−7 installed and that
have 5200 flight cycles or less [1], [2],
[3].
Bombardier recommends that this
service bulletin be done before the
aircraft have 10200 flight cycles,
unless otherwise directed by the
airworthiness authority of the
operator.
For aircraft that have an RTL with part
number KBA670−93470−1 or
BA670−93470−9 or
KBA670−93470−3, or
BA670−93470−981 or
BA670−30000−7969 or
BA670−93470−987 or
BA670−93470−13 or
BA670−93470−963 or
BA670−93470−979 or
BA670−93470−2001 or
BA670−93470−7 installed and that
have more than 5200 flight cycles but
less than 15400 flight cycles [1], [2],
[3].
Bombardier recommends that this
service bulletin be done no more than
5000 flight cycles from the release
date on this service bulletin or before
the aircraft have 17400 flight cycles,
whichever comes first, unless
otherwise directed by the
airworthiness authority of the
operator.
For aircraft that have an RTL with part
number KBA670−93402−1 or
KBA670−93402−3 or
KBA670−93402−5 or
BA670−93470−15 installed.
Bombardier recommends that this
service bulletin be done no more than
6000 flight cycles from the release
date on this service bulletin, unless
otherwise directed by the
airworthiness authority of the
operator.
This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage
Tolerance Inspections (DTIs).
For aircraft with part number BA670−93470−963 or BA670−93470−2001
NOTE: [1] Service Bulletin 670BA−27−013, Flight Controls − Rudder Travel
Limiter − Introduction of a Deflector, must be done in conjunction with
this service bulletin.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 4 of 26
Oct 12/2011
Revision B,  Sep 26/2013

### Page 6

For aircraft with part number BA670−93470−979
NOTE: [2] Service Bulletin 670BA−27−024, Flight Controls − Rudder Travel
Limiter − Identification of the Rudder Travel Limiter Assembly, must be
done in conjunction with this service bulletin.
For aircraft with part number BA670−93470−7
NOTE: [3] Service Bulletin 670BA−27−013, Flight Controls − Rudder Travel
Limiter − Introduction of a Deflector or Service Bulletin 670BA−27−024,
Flight Controls − Rudder Travel Limiter − Identification of the Rudder
Travel Limiter Assembly, must be done in conjunction with this service
bulletin.
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 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 email at thd.crj@aero.bombardier.com.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 5 of 26
Oct 12/2011
Revision B,  Sep 26/2013

### Page 7

It will take an estimated 8.0 man−hours to complete this service bulletin. The
man−hours are divided as shown in the table that follows:
TASK MAN−HOURS
(1) Job Set−Up 1.0
(2) Procedure 2.0
(3) Test 4.0
(4) Job Close−Out 1.0
G. Material − Price and Availability
(1) The kit in the table that follows is available from Bombardier commercial
aircraft.
NOTE: For a list of the kit contents, refer to paragraph 3.A.
KIT NUMBER NAME
670BA27059K1 Rudder Travel Limiter − Return Springs
(2) Please send a purchase order to the address below to schedule the kit:
Bombardier
Service Bulletin Kit Support Team
123 Garratt Blvd, N42−24
Toronto, Ontario
Canada M3K 1Y5
Fax: 416−375−3060
Phone: 416−375−3920
email: sbkits@aero.bombardier.com
Please contact your 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.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 6 of 26
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Revision B,  Sep 26/2013

### Page 8

(1) 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
− Restriction and/or Special Instruction (RSI), C−27−1427−00, Revision C
− Modsum 670T040557, Revision A−3
− Refer to the SB Introduction for definition or explanation of Service
Bulletin content.
− Aircraft Maintenance Manual (AMM)
− Aircraft  Illustrated Parts Catalog (AIPC)
− Structural Repair Manual (SRM)
− For Bombardier reference only: PCA 73983
L. Other Publications Affected
None.
M. Relationship Chart
PRE−SB PART
NUMBER NAME POST−SB PARTNUMBER NAME
E0650−069−2750S
or
BA670−93465−1
Spring BA670−93468−1 Spring
GC415−2627−1 Pulley BA670−93466−1 Pulley
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 9

PRE−SB PART
NUMBER NAME POST−SB PARTNUMBER NAME
BA670−93475−1
BA670−93475−3
KBA670−93402−7
Limiter Arm KBA670−93402−21 Limiter Arm
KBA670−93470−1 Rudder TravelLimiter KBA670−93402−9 Rudder TravelLimiter
BA670−93470−9 Rudder TravelLimiter KBA670−93402−9 Rudder TravelLimiter
KBA670−93470−3 Rudder TravelLimiter KBA670−93402−11 Rudder TravelLimiter
BA670−93470−981 Rudder TravelLimiter KBA670−93402−11 Rudder TravelLimiter
BA670−93470−987 Rudder TravelLimiter KBA670−93402−23 Rudder TravelLimiter
BA670−30000−7969 Rudder TravelLimiter KBA670−93402−13 Rudder TravelLimiter
BA670−93470−13 Rudder TravelLimiter KBA670−93402−13 Rudder TravelLimiter
KBA670−93402−1 Rudder TravelLimiter KBA670−93402−15 Rudder TravelLimiter
KBA670−93402−3 Rudder TravelLimiter KBA670−93402−17 Rudder TravelLimiter
KBA670−93402−5 Rudder TravelLimiter KBA670−93402−19 Rudder TravelLimiter
BA670−93470−15 Rudder TravelLimiter KBA670−93402−19 Rudder TravelLimiter
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 10

2. ACCOMPLISHMENT INSTRUCTIONS
A. Job Set−Up
(1) Reference Information
REFERENCE                                             DESIGNATION
AMM 12−00−00−867−801 Standard Aircraft Configuration for
Maintenance
AMM 20−21−00−910−801 Torquing of Threaded Fasteners
AMM 20−51−00−000−801 Removal of Cotter Pins
AMM 20−51−00−400−801 Installation of Cotter Pins
AMM 24−00−00−910−801 Electrical/Electronic Safety
Precautions
AMM 27−00−00−910−802 Flight−Control Safety Precautions
AMM 27−21−00−710−801 Operational Test of the
Rudder−Control−System
AMM 27−21−00−864−801 Move the Rudder Control Surface in
the Neutral Position
AMM 27−25−00−710−801 Operational Check of the Rudder
Travel Limiter
AMM 27−25−03−000−801 Removal of the Rudder Travel
Limiter Actuator
AMM 27−25−03−400−801 Installation of the Rudder Travel
Limiter Actuator
AMM 27−25−03−820−801 Rigging Check of the Rudder Travel
Limiter Actuator
AMM 27−61−05−740−801 Self Test of the Spoiler and
Stabilizer Control Units
AMM 55−32−32−000−801 Removal of the Elevator−Quadrant
Access Door (325EL/325ER)
AMM 55−32−32−000−802 Removal of the Turnbuckle
Autopilot−Controls Access Door
(325DL)
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 11

REFERENCE                                             DESIGNATION
AMM 55−32−32−400−801 Installation of the Elevator−Quadrant
Access Door (325EL/325ER)
AMM 55−32−32−400−802 Installation of the Turnbuckle
Autopilot−Controls Access Door
(325DL)
SRM 51−21−16−001−001 Finish Codes
SRM 51−26−00−001−001 Cleaning
SRM 51−41−02−001−001 Bolts, Screws and Related Items
(2) Make sure that the aircraft is in standard configuration for maintenance
(AMM 12−00−00−867−801).
(3) Obey all the electrical/electronic safety precautions (AMM
24−00−00−910−801).
(4) Obey all the flight−control safety precautions (AMM 27−00−00−910−802).
(5) Move the rudder control surface to the neutral position (AMM
27−21−00−864−801).
(6) Open, safety, and tag the circuit breakers that follow:
CB−PANEL                   CB NO.                          NAME
CBP−1 F1 SSCU 1 CH A
CBP−1 F2 P FEEL 1 RTL 1
CBP−1 F11 HYD SYST AC PUMP CONT 3B
CBP−1 F14 HYD SYST AC PUMP CONT 2
CBP−2 F1 SSCU 1 CH B
CBP−2 F2 RUDDER TRIM
CBP−2 F13 HYD SYST AC PUMP CONT 1
CBP−2 F14 HYD SYST AC PUMP CONT 3A
CBP−2 LOWER R3 SSCU2 CH A
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 12

CB−PANEL                   CB NO.                          NAME
CBP−2 LOWER R4 SSCU2 CH B
CBP−2 LOWER R5 P FEEL 2 RTL 2
(7) Install warning placards on the rudder pedals to warn not to move the rudder
control surface.
(8) Install warning placards on the control columns to warn not to operate or
move the flight controls.
(9) Remove the access panels that follow:
PANEL                              NAME                                           REFERENCE
325DL Turnbuckle Autopilot−Controls
Access Door
AMM 55−32−32−000−802
325EL Elevator−Quadrant Access Door AMM 55−32−32−000−801
(10) Install rigging pin P1 in the housing (refer to Figure 1, view A).
B. Procedure
Refer to Figure 1.
(1) On the primary actuator (1), disconnect electrical connector A203P1 (2) from
its mating receptacle.
(2) Install the protective covers on electrical connector A203P1 (2) and on the
receptacle of the primary actuator (1).
(3) Remove the nut (3), the lock washer (4), the washer (5), and the bonding
jumper (6).
(4) Remove the spring (7) from the RTL spring bracket as follows:
(a) Remove and discard the cotter pin (8).
WARNING: BE CAREFUL WHEN YOU REMOVE THE SPRING. THE
SPRING CAN HAVE LOAD AND CAUSE INJURIES TO
PERSONS.
(b) Hold the pulley (9) and the spring (7).
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 13

(c) Remove the nut (10), the washers (11), and the bolt (12).
(d) Remove the pulley (9) and the spring (7).
Refer to Figure 2.
(5) Remove the bottom end of the primary actuator (1) as follows:
(a) Remove the nut (2), the washer (3), and the screw (4).
(b) Remove and discard the cotter pin (6).
(c) Hold the primary actuator (1).
(d) Remove the nut (7), the washers (8) and (9), the bushing (10), and the
bolt (11).
(e) Hold the anti−rotation pad (5) when you move the bottom end of the
primary actuator (1) from the limiter arm.
(f) Move the bottom end of the primary actuator (1) and attach it to the
adjacent structure.
(6) Remove and discard the return springs (14) as follows:
WARNING: BE CAREFUL WHEN YOU REMOVE THE SPRINGS. THE
SPRINGS CAN HAVE LOAD AND CAUSE INJURIES TO
PERSONS.
(a) Remove and discard the cotter pins (19).
(b) Disconnect the return springs (14) from the pulleys (15). Discard the
return springs (14).
(c) Remove the nut (18), the washers (17), the pulleys (15), and the bolt
(16) from the housing.
(d) Remove the nut (18), the washers (17), the pulleys (15), and the bolt
(16) from the lever arm (13).
(e) Discard the nuts (18), the bolts (16), and the pulleys (15).
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 14

For aircraft with part numbers KBA670−93470−1, BA670−93470−9, KBA670−93470−3,
BA670−93470−981,  BA670−93470−987, BA670−30000−7969, BA670−93470−13, and for
aircraft 10266 thru 10268, and 15182 thru 15203
(f) Remove and discard the springs (12)
For all Aircraft
(7) Do a detailed visual inspection of the casing of the primary actuator (1) for
signs of chafing or missing paint as follows:
(a) If there is a sign of chafing on the casing of the primary actuator (1), do
as follows:
1 If damage does not go through the casing of the primary actuator
(1), do the steps that follow:
a Apply fluid−resistant primer to the damaged area on the casing
of the primary actuator (1).
b Apply polyurethane topcoat to the damaged area on the casing
of the primary actuator (1).
2 If the damage goes through the casing of the primary actuator (1),
do the steps that follow:
a Remove the A203 primary actuator (1) (AMM
27−25−03−000−801).
b Install the new A203 primary actuator (1) (AMM
27−25−03−400−801).
WARNING: BE CAREFUL WHEN YOU INSTALL THE SPRINGS. THE
SPRINGS CAN HAVE LOAD AND CAUSE INJURIES TO
PERSONS.
(8) Install the new return springs (14) as follows:
(a) Install the pulleys (15) with the bolt (16), the washers (17), the spacer
(20) and the nut (18) on the housing.
(b) Install the pulleys (15) with the bolt (16), the washers (17), and the nut
(18) on the lever arm (13).
(c) Attach the return springs (14) to the pulleys (15).
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 15

(d) Torque the nut (18) from 70 to 90 lbf •in (7.91 to 10.17 N•m), plus
running torque.
(e) Safety the nuts (18) with the cotter pins (19).
(9) Connect the primary actuator (1) of the rudder travel limiter as follows:
(a) Make sure that the primary actuator (1) of the rudder travel limiter is
correctly rigged as follows:
1 Put the primary actuator (1), the bushing (10), and the bolt (11) in
position temporarily.
2 Make sure that it is possible to install the bolt (11) and the bushing
(10).
3 If it is not possible to install the bolt (11) and the bushing (10), do
the rigging check of the rudder−travel limiter actuator (AMM
27−25−03−820−801).
(10) Continue the installation of the primary actuator (1) as follows:
(a) Put the anti−rotation pad (5) and the bottom end of the primary actuator
(1) in position on the rudder travel limiter.
(b) Align the holes in the anti−rotation pad (5) with the holes in the limiter
arm assembly (13).
(c) Clean the bushing (10) with solvent.
(d) Apply Mastinox or fluid−resistant primer to the bushing (10).
(e) Put the bushing (10) in position in the limiter arm.
(f) Make sure that the link assemblies align with the bushing (10).
(g) Install the bolt (11), the washers (8) and (9), and the nut (7).
(h) Attach the anti−rotation pad (5) with the bolt (4), the washer (3), and the
nut (2).
(i) Torque the nut (7) from 70 to 90 lbf •in (7.91 to 10.17 N•m), plus running
torque.
(j) Torque the nut (2) from 13 to 16 lbf •in (1.47 to 1.81 N•m), plus running
torque.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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(k) Safety the nut (7) with the cotter pin (6).
Refer to Figure 1.
(11) Install the spring (7) on the RTL spring bracket as follows:
(a) Attach the pulley (9) and the spring (7) together.
WARNING: BE CAREFUL WHEN YOU INSTALL THE SPRING. THE
SPRING CAN HAVE LOAD AND CAUSE INJURIES TO
PERSONS.
(b) Install the pulley (9) and the spring (7) on the RTL spring bracket with
the bolt (12), the washers (11), and the nut (10).
(c) Safety the nut (10) with the cotter pin (8).
(12) Install the bonding jumper (6), the washer (5), the lock washer (4), and the
nut (3).
(13) Remove the protective covers from electrical connector A203P1 (2) and the
receptacle of the primary actuator (1).
(14) Connect electrical connector A203P1 (2) to its mating receptacle.
(15) Identify the rudder travel limiter at the location shown in view D as follows:
NOTE: If you do not see your part number in the table that follows, speak with a
representative of the Customer Response Center (CRC) at
1−514−855−5001 or send an e−mail to thd.crj@aero.bombardier.com.
(a) Clean the identification area with solvent.
(b) Identify the rudder travel limiter with ink. Refer to the table that follows
for the applicable identification number:
PRE−MOD POST−MOD
KBA670−93402−1 KBA670−93402−15
KBA670−93402−3 KBA670−93402−17
KBA670−93402−5 KBA670−93402−19
BA670−93470−15
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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PRE−MOD POST−MOD
KBA670−93470−1 KBA670−93402−9
BA670−93470−9
KBA670−93470−3 KBA670−93402−11
BA670−93470−981
BA670−93470−987 KBA670−93402−23
BA670−30000−7969 KBA670−93402−13
BA670−93470−13
(c) Apply a layer of clear polyurethane topcoat on the new identification
number.
Refer to Figure 2.
(16) Identify the lever arm (13) as follows:
(a) Make sure to remove the last identification number.
(b) Clean the identification area with solvent.
(c) Identify the lever arm (13) with ink marking as KBA670−93402−21.
(d) Apply a layer of clear polyurethane topcoat on the new identification
number.
(17) Measure the clearance between the return springs (14) and the primary
actuator as follows:
(a) On the pilot FS280.00 bulkhead, set the MAINT switch to MFD 1 or
MFD 2.
(b) On the MDC MAINTENANCE MAIN MENU, go to LRU TEST.
(c) On the LRU TEST page, go to SSCU 1.
(d) On the SSCU 1 primary page, go to SET RUD LIMITER CH1 POS.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 16 of 26
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### Page 18

(e) On the SET RUD LIMITER CH1 POS page, go to POS5−ACT FULL
EXTEND.
(f) Make sure that there is a minimum clearance of 0.050 in. (1.27 mm)
between the primary actuator and the return springs (Refer to view D).
(g) On the EICAS control panel, push the MENU button to go back to the
main menu page.
(h) On the pilot FS280.00 bulkhead, set the MAINT switch to the OFF
position.
(i) Make sure that the navigation data is shown on MFD 1 (MFD 2).
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 19

bc3032a01.cgm, mgr, aug.4, 2011
4
5
6
2
1
7
SECONDARY
ACTUATOR (REF)
3
P1
1
10
12
11
9
8
RTL SPRING
BRACKET (REF)
B
C
A
B
C
LEGEND
  1. Primary actuator.
  2. Electrical connector A203P1.
  3. Nut.
  4. Lock washer MS35338−43. 
  5. Washer.
  6. Bonding jumper.
  7. Spring.
  8. Cotter pin MS24665−69.
  9. Pulley.
10. Nut.
11. Washer.
12. Bolt.
P1. Rigging pin.
A
11
RECEPTACLE
(REF)
 
SERVICE BULLETIN 670BA−27−059
Rudder Travel Limiter − Return Springs Replacement
Figure 1
S.B. 670BA−27−059
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### Page 20

ba7037a03.cgm, mgr, aug24/2011 
POST−MOD
PRE−MOD
13
RETURN
SPRING
(REF)
LINK
ASSEMBLY
(REF)
2
3
5
1
12
8
6
7
9
LINK
ASSEMBLY
(REF)
10
411
1
13
2
3
5
8
6
7
9
10
4
11
  1. Primary actuator.
  2. Nut.
  3. Washer.
  4. Screw.
  5. Anti−rotation pad.
  6. Cotter pin 
      MS24665−132 (Pre−Mod).
      MS24665−69 (Post−Mod).
  7. Nut MS14145L4.
LEGEND
 8. Washer.
 9. Washer.
10. Bushing.
11. Bolt.
12. Spring.
13. Lever arm assembly
      BA670−93475−1, 
      BA670−93475−3, or
      KBA670−93402−7 (Pre−Mod),
      KBA670−93402−21 (Post−Mod).
A
B
B
B
C
SERVICE BULLETIN 670BA−27−059
Rudder Travel Limiter − Return Springs Replacement
Figure 2 (Sheet 1 of 3)
S.B. 670BA−27−059
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### Page 21

ba7037a04.cgm, mgr, jaug24/2011
13
15
15
16
17
17
18
19
HOUSING 
(REF)
18
19
14
15
13
POST−MOD
1515
17
17
16
18
20
19
HOUSING 
(REF)
14
PRE−MODC
C
LINK
ASSEMBLY
(REF)
LINK
ASSEMBLY
(REF)
LEGEND
13. Lever arm assembly
      BA670−93475−1, BA670−93475−3, or
      KBA670−93402−7 (Pre−Mod),
      KBA670−93402−21 (Post−Mod).
14. Return spring
      E0650−069−2750S or
      BA670−93465−1 (Pre−Mod),
      BA670−93468−1 (Post−Mod).
15. Pulley
      GC415−2627−1 or
      BA670−93466−1 (Pre−Mod),
      BA670−93466−1 (Post−Mod).
16. Bolt NAS6203−18D or
             NAS6203−19D (Pre−Mod),
             NAS6203−30D (Post−Mod).
17. Washer.
18. Nut MS14145L3.
19. Cotter pin
      MS24665−132 (Pre−Mod),
      MS24665−69 (Post−Mod).
20. Spacer
      NAS43DD3−25N.
SERVICE BULLETIN 670BA−27−059
Rudder Travel Limiter − Return Springs Replacement
Figure 2 (Sheet 2 of 3)
S.B. 670BA−27−059
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### Page 22

ba7037a05.cgm,
ROTATED AT 90° CLOCKWISE
NOTES:
A minimum clearance of 0.050 in. (1.27 mm)
between the return springs  and primary actuator
when the primary and the secondary actuators
are fully retracted.
2
Location of the identification.1
PRIMARY
ACTUATOR
(REF)
RETURN
SPRING
(REF)
A
2
1
D
D
SERVICE BULLETIN 670BA−27−059
Rudder Travel Limiter − Return Springs Replacement
Figure 2 (Sheet 3 of 3)
S.B. 670BA−27−059
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### Page 23

C. Job Close−Out
(1) Remove all tools, equipment, and unwanted materials from the work area.
Refer to Figure 1.
(2) Remove rigging pin P1 from the rudder travel limiter.
(3) Install the access panels that follow:
PANEL                              NAME                                           REFERENCE
325DL Turnbuckle Autopilot−Controls
Access Door
AMM 55−32−32−400−802
325EL Elevator−Quadrant Access Door AMM 55−32−32−400−801
(4) Remove warning placards from the rudder pedals.
(5) Remove warning placards from the control columns.
(6) Remove the tags and close the circuit breakers that follow:
CB−PANEL                   CB NO.                          NAME
CBP−1 F1 SSCU 1 CH A
CBP−1 F2 P FEEL 1 RTL 1
CBP−1 F11 HYD SYST AC PUMP CONT 3B
CBP−1 F14 HYD SYST AC PUMP CONT 2
CBP−2 F1 SSCU 1 CH B
CBP−2 F2 RUDDER TRIM
CBP−2 F13 HYD SYST AC PUMP CONT 1
CBP−2 F14 HYD SYST AC PUMP CONT 3A
CBP−2 LOWER R3 SSCU2 CH A
CBP−2 LOWER R4 SSCU2 CH B
CBP−2 LOWER R5 P FEEL 2 RTL 2
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 24

(7) Do the operational test of the rudder travel limiter (AMM
27−25−00−710−801).
(8) Do the operational test of the rudder−control−system (AMM
27−21−00−710−801).
(9) Do the self test of the spoiler and stabilizer control units (AMM
27−61−05−740−801).
(10) When this service bulletin is completed, make this entry in the applicable
logbook(s): "Service Bulletin 670BA−27−059, Revision B, Flight Controls −
Rudder Travel Limiting System − Replacement of the Return Springs of the
Rudder Travel Limiter, incorporated."
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 25

3. MATERIAL INFORMATION
A. Kit Information
Kit Content:
KIT 670BA27059K1
PART NUMBER QUANTITY
[1]
NAME ALTERNATE
PART(S)
NOTES
BA670−93466−1 6 Pulley
BA670−93468−1 3 Spring
MS14145L3 2 Nut
MS14145L4 1 Nut
MS24665−69 3 Cotter pin
NAS43DD3−25N 2 Spacer
NAS6203−30D 2 Bolt
[1] The kit can contain more hardware and/or material than necessary.
NOTE: For allowable superseded parts, refer to the Part Supersession
Cross−Reference Lists at www.iflybombardier.com under Resources –
Engineering Documents.
B. Consumable Information
The materials that follow are necessary to do this service bulletin and can be ordered
from Bombardier or purchased directly from industry sources. If the material is
ordered from Bombardier, there can be some lead time because of shelf life of the
material.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 26

CONSUMABLES
SPECIFICATION QUANTITY NAME REFERENCE
BAMS 565−002 As necessary Polyurethane Topcoat,
Fluid−Resistant (Color
grey (16473), FED−STD
595B)
07−019 [1]
6856K As necessary Mastinox, Corrosion
Inhibitor
13−001 [1]
As necessary As necessary Fluid−Resistant Epoxy
Primer
13−006 [1]
[1] Refer to AMM 51−31−00−992−801.
NOTE: To complete this list of consumables, refer to the different tasks given as
references in this service bulletin.
C. Special Tools and Equipment
SPECIAL TOOLS AND EQUIPMENT
PART NUMBER QUANTITY NAME ALTERNATE
PART(S)
G601R270001−1 [1] 1 Pins Kit − Rigging or equivalent
[1] Refer to the Illustrated Tool and Equipment Manual (CSP B−007).
NOTE: To complete this list of special tools and equipment, refer to the different
tasks given as references in this service bulletin.
D. Disposition of Parts
The table that follows shows the disposition of installed parts on the aircraft (or
spares), and the relation of the installed parts (or spares) to the new parts to be
installed with this service bulletin.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
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### Page 27

PRE−SB PART NUMBER QUANTITY DC POST−SB PART
NUMBER
E0650−069−2750S
or
BA670−93465−1
2 DIS BA670−93468−1
BA670−93492−1 2 DIS N/A
GC415−2627−1 4 DIS BA670−93466−1
KBA670−93470−1 1 RWK KBA670−93402−9
BA670−93470−9 1 RWK KBA670−93402−9
KBA670−93470−3 1 RWK KBA670−93402−11
BA670−93470−981 1 RWK KBA670−93402−11
BA670−93470−987 1 RWK KBA670−93402−23
BA670−30000−7969 1 RWK KBA670−93402−13
BA670−93470−13 1 RWK KBA670−93402−13
KBA670−93402−1 1 RWK KBA670−93402−15
KBA670−93402−3 1 RWK KBA670−93402−17
KBA670−93402−5 1 RWK KBA670−93402−19
BA670−93470−15 1 RWK KBA670−93402−19
Disposition code (DC):
DIS: Discard Part.
RWK: Rework the part as shown in this service bulletin.
SERVICE BULLETIN 670BA−27−059
S.B. 670BA−27−059
Page 26 of 26
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### Page 28

THANK YOU FOR ANSWERING THIS EVALUATION FORM 
UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 
450-476-7300 or email to CRJ_SB_Evaluation_Form@aero.bombardier.com 
 
SERVICE BULLETIN EVALUATION FORM/COMPLIANCE SHEET 
(YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS) 
SERVICE BULLETIN :  ISSUE:  
 
 STRONGLY DISAGREE NEUTRAL AGREE STRONGLY 
 DISAGREE    AGREE 
 Instructions to do the Service Bulletin 
were accurate. 
Comments: 
     
 Illustration(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

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