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:
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 26/2013
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

Oct 12/2011

Revision B, Sep 26/2013
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
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
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

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

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Oct 12/2011

Revision B, Sep 26/2013
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 Travel

Limiter KBA670−93402−9 Rudder TravelLimiter

BA670−93470−9 Rudder Travel

Limiter KBA670−93402−9 Rudder TravelLimiter

KBA670−93470−3 Rudder Travel

Limiter KBA670−93402−11 Rudder TravelLimiter

BA670−93470−981 Rudder Travel

Limiter KBA670−93402−11 Rudder TravelLimiter

BA670−93470−987 Rudder Travel

Limiter KBA670−93402−23 Rudder TravelLimiter

BA670−30000−7969 Rudder Travel

Limiter KBA670−93402−13 Rudder TravelLimiter

BA670−93470−13 Rudder Travel

Limiter KBA670−93402−13 Rudder TravelLimiter

KBA670−93402−1 Rudder Travel

Limiter KBA670−93402−15 Rudder TravelLimiter

KBA670−93402−3 Rudder Travel

Limiter KBA670−93402−17 Rudder TravelLimiter

KBA670−93402−5 Rudder Travel

Limiter KBA670−93402−19 Rudder TravelLimiter

BA670−93470−15 Rudder Travel

Limiter KBA670−93402−19 Rudder TravelLimiter

SERVICE BULLETIN 670BA−27−059

S.B. 670BA−27−059

Page 8 of 26

Oct 12/2011

Revision B, Sep 26/2013
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

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Oct 12/2011

Revision B, Sep 26/2013
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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Oct 12/2011

Revision B, Sep 26/2013
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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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

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Oct 12/2011

Revision B, Sep 26/2013
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).

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(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

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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

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Revision B, Sep 26/2013
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

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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 26/2013
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

Page 18 of 26

Oct 12/2011

Revision B, Sep 26/2013
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

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 26/2013
ba7037a04.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

C PRE−MOD

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 26/2013
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

1 Location of the identification.

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 26/2013
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

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 26/2013
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

Page 24 of 26

Oct 12/2011

Revision B, Sep 26/2013
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

Page 25 of 26

Oct 12/2011

Revision B, Sep 26/2013
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

Oct 12/2011

Revision B, Sep 26/2013
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