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 bulletin LQFRUSRUDWHG

. 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: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: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 Oct 12/2011 Revision B, Sep 26/2013C. 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 Oct 12/2011 Revision B, Sep 26/2013For 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 26/2013For 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 26/2013It 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 Oct 12/2011 Revision B, Sep 26/2013(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 PART NUMBER 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 Page 7 of 26 Oct 12/2011 Revision B, Sep 26/2013PRE−SB PART NUMBER NAME POST−SB PART NUMBER NAME

BA670−93475−1 BA670−93475−3 KBA670−93402−7 Limiter Arm KBA670−93402−21 Limiter Arm

KBA670−93470−1 Rudder Travel Limiter KBA670−93402−9 Rudder Travel Limiter
BA670−93470−9 Rudder Travel Limiter KBA670−93402−9 Rudder Travel Limiter
KBA670−93470−3 Rudder Travel Limiter KBA670−93402−11 Rudder Travel Limiter
BA670−93470−981 Rudder Travel Limiter KBA670−93402−11 Rudder Travel Limiter
BA670−93470−987 Rudder Travel Limiter KBA670−93402−23 Rudder Travel Limiter
BA670−30000−7969 Rudder Travel Limiter KBA670−93402−13 Rudder Travel Limiter
BA670−93470−13 Rudder Travel Limiter KBA670−93402−13 Rudder Travel Limiter
KBA670−93402−1 Rudder Travel Limiter KBA670−93402−15 Rudder Travel Limiter
KBA670−93402−3 Rudder Travel Limiter KBA670−93402−17 Rudder Travel Limiter
KBA670−93402−5 Rudder Travel Limiter KBA670−93402−19 Rudder Travel Limiter
BA670−93470−15 Rudder Travel Limiter KBA670−93402−19 Rudder Travel Limiter 

### SERVICE BULLETIN 670BA−27−059

S.B. 670BA−27−059 Page 8 of 26 Oct 12/2011 Revision B, Sep 26/20132. 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 Page 9 of 26 Oct 12/2011 Revision B, Sep 26/2013REFERENCE 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 Page 10 of 26 Oct 12/2011 Revision B, Sep 26/2013CB−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 Page 11 of 26 Oct 12/2011 Revision B, Sep 26/2013(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 Page 12 of 26 Oct 12/2011 Revision B, Sep 26/2013For 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 Page 13 of 26 Oct 12/2011 Revision B, Sep 26/2013(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 Page 14 of 26 Oct 12/2011 Revision B, Sep 26/2013(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 Page 15 of 26 Oct 12/2011 Revision B, Sep 26/2013PRE−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 Oct 12/2011 Revision B, Sep 26/2013(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 Page 17 of 26 Oct 12/2011 Revision B, Sep 26/2013bc3032a01.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 Page 18 of 26 Oct 12/2011 Revision B, Sep 26/2013ba7037a03.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

4 11

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 Page 19 of 26 Oct 12/2011 Revision B, Sep 26/2013ba7037a04.cgm, mgr, jaug24/2011 13 15 15 16 17

17 18
19

HOUSING (REF) 18 19 14

15

13

POST−MOD 15 15 17

17 16 18 20 19

HOUSING (REF) 14 PRE−MOD C

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 Page 20 of 26 Oct 12/2011 Revision B, Sep 26/2013ba7037a05.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 Page 21 of 26 Oct 12/2011 Revision B, Sep 26/2013C. 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 Page 22 of 26 Oct 12/2011 Revision B, Sep 26/2013(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 Page 23 of 26 Oct 12/2011 Revision B, Sep 26/20133. 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 Page 24 of 26 Oct 12/2011 Revision B, Sep 26/2013CONSUMABLES

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 Page 25 of 26 Oct 12/2011 Revision B, Sep 26/2013PRE−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 Oct 12/2011 Revision B, Sep 26/2013THANK 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 EVALUATI ON 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: 

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 Illustration(s), figure(s), picture(s) and/or kit drawing(s) were helpful to carry out instructions. Comments: 

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 If a parts kit was required, did the kit contents received agree with the contents listed in the bulletin? Comments: 

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 Aircraft hands-on work was accomplished in estimated time. Comments: 

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 Overall, I was satisfied with this Service Bulletin. Comments: 

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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