SB 601R---27---160 Page 1 of 1 Oct 03/2012 

## SERVICE BULLETIN REVISION TRANSMITTAL SHEET CL ---600 ---2B19 Canadair Regional Jet (CRJ) Aircraft SERVICE BULLETIN 601R ---27 ---160
SUBJECT: Flight Controls --- Horizontal Stabilizer Trim Actuator (HSTA) --- Serialization of the HSTA Pins and Trunnions This page transmits: Revision A of Service Bulletin 601R --- 27 --- 160, pages 1 thru 20, dated Oct 03/2012. The changes in this revision have no effect on aircraft that have incorporated a previous issue of this service bulletin.

Reason: Revised Planning Information, paragraph 1., to: Remove aircraft serial numbers 8114 thru 8999 from the effectivity. Revised Accomplishment Instructions, paragraph 2., to: Add indelible ink as an alternate identification method to the vibro-peening. Add steps for the installation of new trunnions. This revision also includes small editorial changes that do not have an effect on the technical content.
Instructions: Discard the copy of Service Bulletin 601R --- 27 --- 160, dated Sep 29/ 2011. Replace with the copy attached. Service Bulletin History: Initial issue, dated Sep 29/2011. 1Page 1 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 

# SERVICE BULLETIN

Technical Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED 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 HAS INCLUDED THE NEW OPERATOR AIRCRAFT, THIS SERVICE BULLETIN MUST BE SENT TO THE LESSEE. IF THE OPERATOR

ON THE DISTRIBUTION LIST.

ATA SYSTEM: 27 ---42 NUMBER: 601R ---27 ---160 SUBJECT: Flight Controls --- Horizontal Stabilizer Trim Actuator (HSTA) --- Serialization of the HSTA Pins and Trunnions

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service Bulletin: CL ---600---2B19 aircraft with the components that follow installed:

Part number: 600---92383---5, 600---92383---7, 600---92384---5, 600---92384---7, 601R92309---1, 601R92310---1, 601R92386---1 Installed at time of delivery on aircraft with serial numbers: 7003---7067, 7069---7990, 8000 thru 8113.
Spares: It is necessary to give a serial number and change the identification of all spare parts as shown in this service bulletin.

All CL ---600---2B19 If parts listed above are installed, but were not identified at the time of aircraft delivery, on the same or on a different aircraft model, it is necessary to incorporate this service bulletin.

### SERVICE BULLETIN 601R---27 ---160

Page 2 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 Production: This change will be incorporated before delivery on Aircraft Serial Numbers 8114 and subsequent. 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 STC, STA or e quivalent action changes to make sure you can complete this bulletin. B. Reason (1) Condition The pins and the trunnions of the HSTA are not serialized. Therefore, it is not possible to keep a record of the life of the pins and the trunnions installed on the HSTA. (2) Evidence None. (3) Objective/Benefit This service bulletin gives the procedure to serialize the pins and the trunnions on the attachments of the HSTA. Serialization of the pins and the trunnions, on the attachments of the HSTA, will give traceability and service history to agree with Federal Aviation Regulation FAR 25.1529. C. Description Access panels are removed. Circuits breakers are opened. The HSTA is removed. The pins and the trunnions on the HSTA are serialized and their part numbers are changed. The HSTA is installed. Return-to-service tests are done. D. Compliance
Recommended Service Bulletin. Bombardier recommends that this service bulletin be done no more than 5000 flight hours from the release date on this service bulletin or no later than the subsequent inspection of Airworthiness Limitation (AWL) 27---40---102 of the Maintenance Requirements Manual (MRM) Part 2, Appendix B, whichever comes first, unless otherwise directed by the airworthiness authority of the operator.

### SERVICE BULLETIN 601R---27 ---160

Page 3 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 This service bulletin affects Airworthiness Limitations (AWLs) and/or Damage Tolerance Inspections (DTIs). Reference applicable Pre/Post Modsum TC601R18078 and/or service bulletin 601R---27---160 in the (MRM). E. Approval The technical content of this service bulletin has been approved under the authority of the TCCA Design Approval Organization No: DAO #93---Q ---02. F. Manpower The man-hours given below are estimates for direct labor done by an experienced crew on an aircraft prepared for maintenance. These estimates do not include the time necessary for: --- Administrative functions such as planning, liaising, familiarization, and report writing. --- Non-productive elapsed time such as rest time, having meals, and crew shift changes. --- Elapsed time such as for paint to dry, sealant to cure, and fuel tank venting. --- Preparation for modification (unless specified in the Accomplishment Instructions) such as cleaning and getting parts, tools, consumables, and ground equipment. --- Quality assurance inspections, troubleshooting and/or correction of discrepancies found when a task is done. --- All other activities that are not considered by Bombardier as directly related to the accomplishment of this procedure. NOTE: For on-site labor assistance, please speak with a Fleet Services representative for a quote. The Fleet Services Team can be contacted through the CRC at 514-855-8500 or email at thd.crj@aero.bombardier.com.

### SERVICE BULLETIN 601R---27 ---160

Page 4 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 It will take an estimated 20.0 man-hours to complete this service bulletin. The man-hours are divided in the table that follows (elapsed cure time is not included in the man-hour summary given above): TASK MAN-HOURS (1) Job Set-Up 8.0 (2) Procedure 1.0 (3) Test 3.0 (4) Job Close-Out 8.0

NOTE: The man-hours for the procedure do not include the hours to replace damaged parts. G. Material --- Price and Availability (1) The kits in the tables that follow are available from Bombardier Commercial Aircraft. NOTE: For a list of kit contents, refer to paragraph 3.A.

KIT NUMBER NAME 601R27---160K1 HSTA --- Laminated shims kit 601R27---160K2 HSTA --- Hardware kit
(2) Please send a purchase order to the address below to schedule kit delivery: 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 the Service Bulletin Kit Support Team at the address above for terms and conditions.

### SERVICE BULLETIN 601R---27 ---160

Page 5 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 (3) The parts in the table that follows can be necessary to do this service bulletin and are available from Bombardier Commercial Aircraft.

PART NUMBER NAME QUANTITY ALTERNATE PART NUMBER 601R92309---3 Lower pin 2 601R92309---1 ¡ 601R92310---3 Upper pin 2 601R92310---1 ¡ 601R92386---3 Trunnion 4 601R92386---1 ¡ ¡ If the alternate part number is ordered, it is necessary to give a serial number and change the identification of the part as given in this service bulletin.
(4) Please send a purchase order to the address below to schedule part delivery: 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 For Business/Corporate Operators All Business/Corporate operators (i.e. operators who do not have a commercial airline operation) refer to SB 800-00-004 for commercial policy coverage and logistics/planning arrangements (refer to www.cic.bombardier.com/technical library/service bulletins/challenger/850/SB 800-00-004). To place an order for parts or kits, please call Bombardier Parts Logistics at 514-855-2999 or 1-866-538-1247. H. Tooling --- Price and Availability There are no tool kits for this service bulletin. Refer to paragraph 3.C. for a list of special tools and equipment for this service bulletin. I. Weight and Balance Not changed.

### SERVICE BULLETIN 601R---27 ---160

Page 6 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 J. Electrical Load Data Not changed. K. References Restriction and/or Special Instruction (RSI) C ---A275, Revision A. Modification Summary TC601R18078, Revision B. Refer to the SB Introduction document for definition or explanation of Service Bulletin content. Aircraft Maintenance Manual Maintenance Requirement Manual Structural Repair Manual (SRM) For Bombardier reference only: PCA 05479. L. Other Publications Affected Aircraft Illustrated Part Catalog (AIPC) Aircraft Maintenance Manual (AMM) Maintenance Requirement Manual (MRM) M. Relationship Chart

PRE-SB PART NUMBER NAME POST-SB PART NUMBER NAME

600---92384---5 Pin K601R92308---5 or 601R92310---3 Pin

600---92384---7 Pin K601R92308---7 or 601R92310---3 Pin

601R92310---1 Pin K601R92308---9 or 601R92310---3 Pin

600---92383---5 Pin K601R92308---11 or 601R92309---3 Pin

600---92383---7 Pin K601R92308---13 or 601R92309---3 Pin

601R92309---1 Pin K601R92308---15 or 601R92309---3 Pin

601R92386---1 Trunnion K601R92308---19 or 601R92386---3 Trunnion

### SERVICE BULLETIN 601R---27 ---160

Page 7 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 2. ACCOMPLISHMENT INSTRUCTIONS Reference Information
REFERENCE DESIGNATION AMM 12---00---07---861---801 Connect External AC Power AMM 20---21---00---910---801 Torque procedures for Threaded Fasteners AMM 24---00---00---910---801 Electrical/Electronic Safety Precautions AMM 27---40---00---710---802 Operational Test of the Horizontal Stabilizer Trim System AMM 27---41---00---740---801 Functional Check (Ground Maintenance Test) of the HSTCU AMM 27---42---01---000---801 Removal of the Horizontal-Stabilizer Trim Actuator (HSTA) AMM 27---42---01---400---801 Installation of the Horizontal-Stabilizer Trim Actuator (HSTA) AMM 51---26---00---110---801 Solvent Cleaning AMM 55---32---05---000---806 Removal of the Middle Upper Fairing AMM 55---32---05---400---806 Installation of the Middle Upper Fairing AMM 55---32---05---000---807 Removal of the Middle Lower Fairing AMM 55---32---05---400---807 Installation of the Middle Lower Fairing SRM 51---21---11 Corrosion Prevention Procedures SRM 51---21---16 Finish Codes SRM 51---23---00 Pressure, Environmental, Fuel Tank and Firewall Sealing SRM 51---25---06 Fluid ---Resistant (FR) Epoxy Primer SRM 51---25---16 Fluid ---Resistant (FR) Polyurethane Topcoat SRM 51---26---00 Cleaning SRM 51---41---02 Bolts, Screws and related items

### SERVICE BULLETIN 601R---27 ---160

Page 8 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 Tolerance Information Linear Tolerances Angular Tolerance X.XX in. (X.X mm) X.X in. (X mm) +/ ---0  ̊ 30” +/ --- 0.03 in. +/--- 0.1 in. +/ --- 0.8 mm +/ --- 3 mm NOTE: The tolerances above apply to the dimensions given in this service bulletin, except when specified differently.

### SERVICE BULLETIN 601R---27 ---160

Page 9 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 A. Job Set-Up (1) Obey all the electrical/electronic safety precautions (AMM 24---00---00---910---801). (2) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE

CBP ---2 B8 STAB CH1 HSTA 222 CBP ---2 F5 STAB CH1 HSTCU 222 CBP ---3 A5 STAB CH2 HSTA 221 CBP ---4 A1 STAB CH2 HSTCU 222
WARNING: PUT THE SAFETY DEVICES, THE WARNING SIGNS, AND THE WARNING PLACARDS IN POSITION BEFORE YOU START A PROCEDURE ON OR NEAR: FLIGHT CONTROLS FLIGHT CONTROL SURFACES COMPONENTS THAT MOVE. MAKE SURE THAT THERE ARE NO PERSONS OR EQUIPMENT ON OR NEAR THE FLIGHT CONTROL SURFACES. ACCIDENTAL MOVEMENT OF THE FLIGHT CONTROLS CAN CAUSE INJURIES TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (3) Install the applicable warning placards on the pilot’s and the copilot’s control wheels and the STAB TRIM/MACH TRIM panel. CAUTION: MAKE SURE THAT THE REAR FUSELAGE SUPPORT IS PUT DIRECTLY BELOW THE RIVET LINE AT FS755.00 (37 INCHES AFT OF THE BAGGAGE COMPARTMENT DOOR). IF THE REAR FUSELAGE SUPPORT IS NOT DIRECTLY BELOW THE RIVET LINE, DAMAGE TO THE AIRCRAFT CAN OCCUR. (4) Remove the access panels that follow:

ACCESS DESIGNATION REFERENCE Middle Upper Fairing Access panel AMM 55---32---05---000---806

Middle Lower Fairing Access panel AMM 55---32---05---000---807

### SERVICE BULLETIN 601R---27 ---160

Page 10 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 B. Procedure Refer to Figure 1. (1) Remove the HSTA from the aircraft (AMM 27---42---01---000---801).

. (a) Record the position of the removed trunnions. (2) Discard the cotter pins (2), (12), and (18), the bolts (7), (15) and (19), the laminated shims (8), the nuts (11), and the washers (10). (3) Clean the trunnions (9), the upper pins (1) and the lower pins (13) with solvent (SRM 51---26---00) (4) Do a visual inspection of the trunnions (9), the upper pins (1) and the lower pins (13) for gouges, scratches or corrosion. (5) Discard the upper pins (1) and the lower pins (13) that have gouges, scratches or corrosion. (6) Keep the trunnions (9) that have gouges, scratches or corrosion for subsequent steps. (7) Change the identification of the trunnions (9), the upper pins (1) and the lower pins (13) that are not damaged and add a serial number as follows: NOTE: It is permitted to use this step to change the identification of the spare parts. NOTE: If trunnions P/N 601R92386---3, lower pins P/N 601R92309---3, and upper pins P/N 601R92310---3 are used to replace the defective parts, it is not necessary to do this step.
NAME PART NUMBER (PRE ---MOD) PART NUMBER (POST ---MOD) SERIAL NUMBER Upper pin 600---92384---5 K601R92308---5 SS/N RJ/XXXYYYYY ¡ Upper pin 600---92384---7 K601R92308---7 SS/N RJ/XXXYYYYY ¡ Upper pin 601R92310---1 K601R92308---9 SS/N RJ/XXXYYYYY ¡ Lower pin 600---92383---5 K601R92308---11 SS/N RJ/XXXYYYYY ¡ Lower pin 600---92383---7 K601R92308---13 SS/N RJ/XXXYYYYY ¡ Lower pin 601R92309---1 K601R92308---15 SS/N RJ/XXXYYYYY ¡

### SERVICE BULLETIN 601R---27 ---160

Page 11 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 NAME SERIAL NUMBER PART NUMBER (POST ---MOD) PART NUMBER

(PRE ---MOD) Trunnion 601R92386---1 K601R92308---19 SS/N RJ/XXXYYYYY ¡ ¡ XXX, is for the three-letters airline designator code that the International Civil Aviation Organization (ICAO) gave to the airline. YYYYY, is for the five-digit sequence number that the operator chose. (a) If the ICAO airline designator code is not available, write the serial number as follows: SS/N RJ/BA(aircraft serial number) ---1 or subsequent number. When the identification of the serial number is done on a spare part, the aircraft serial number of one of the aircraft of the fleet and a subsequent number is used. Example:

AIRCRAFT

SERIAL NUMBER PART NUMBER SERIAL NUMBER
8999 K601R92308---9 SS/N RJ/BA8999---1 8999 K601R92308---9 SS/N RJ/BA8999---2 7900 K601R92308---15 SS/N RJ/BA7900---1 7901 K601R92308---15 SS/N RJ/BA7901---1 Spare K601R92308---19 SS/N RJ/BA7901---2 7821 K601R92308---19 SS/N RJ/BA7821---1 NOTE: It is permitted to use indelible ink as an alternate identification method to the vibro ---peening to write the serial number and the identification number on the upper and the lower pins. (b) Prepare the surface for identification of the upper pins (1) and the lower pins (13) for vibro-peening as follows: NOTE: If indelible ink is used as an alternate identification method to the vibro-peening, it is necessary to do steps 4 and 5 only.
1 Install waterproof paper and masking tape on the adjacent surfaces.

### SERVICE BULLETIN 601R---27 ---160

Page 12 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 2 Clean the surface with a solvent cleaner (AMM 51---26---00---110---801).
3 Remove the cadmium plating with aluminium oxide abrasive (400-grit or finer).
4 If indelible ink is used as an alternate identification method to the vibro ---peening, lightly rub the surface of the identification area with a scotch brite and make sure not to remove the paint.
5 Clean the area with a solvent cleaner (AMM 51---26---00---110---801). (c) Use identification method 2D1 of Aerospace Standard AS 478 and the instructions that follow to vibro ---peen the part number and the serial number on the upper pins(1) (Refer to Figure 1, sheet 2, view B): NOTE: If indelible ink is used as an alternate identification method to the vibro-peening, the depth criteria is not necessary. --- The part number and the serial number of the upper pin (1) must be at 0.52 in. (13.2 mm) from the edge of the upper pin (1) and at a minimum of 0.440 in. (11.18 mm) from the center of the hole. --- The part number and the serial number must be in block capital letters and Arabic numerals without serif fonts. --- Letter height must be 0.10 inch (2.5 mm). --- The depth of the letter must be between 0.001 and 0.006 in. (0.03 and 0.15 mm). (d) Use identification method 2D1 of Aerospace Standard AS 478 and the instructions that follow to vibro ---peen the part number and the serial number on the lower pins(13) (Refer to Figure 1, sheet 2, view D): NOTE: If indelible ink is used as an alternate identification method to the vibro-peening, the depth criteria is not necessary. --- The part number of the lower pin (13) must be at 0.52 in. (13.2 mm) from the edge of the lower pin (13) and at a minimum of 0.450 in. (11.43 mm) from the center of the hole. --- The serial number of the lower pin (13) must be at 0.81 in. (20.6) from the edge and at a minimum of 0.130 in. (3.30 mm) from the lower edge of the lower pin (13). --- The part number and the serial number must be in block capital letters and Arabic numerals without serif fonts.

### SERVICE BULLETIN 601R---27 ---160

Page 13 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 --- Letter height must be 0.10 inch (2.5 mm). --- The depth of the letter must be between 0.001 and 0.006 in. (0.03 and 0.15 mm). (e) For the vibro-peening identifications done on the upper pins (1) and the lower pins (13), do as follows: 1 Apply a brush coat of cadmium plating on the bare metal surfaces of the upper pins (1) and the lower pins (13) (SRM 51---21---11). 2 Apply a layer of fluid-resistant primer on the bare metal surfaces of the upper pins (1) and the lower pins (13) (SRM 51---25---06). (f) For the indelible ink identifications done on the upper pins (1) and the lower pins (13), do as follows: 1 Apply a layer of clear polyurethane topcoat on the identification (SRM 51---25---16). 2 Make sure that you can read the identification. (g) Prepare the surface for identification of the trunnions (9) with indelible ink as follows: 1 Lightly rub the surface of the identification area with a scotch brite and make sure not to remove the paint. 2 Clean the area with a solvent cleaner (AMM 51---26---00---110---801). (h) With an indelible ink pen and the instructions that follow, write the part number and the serial number on the trunnions (9): (Refer to Figure 1, sheet, view C): NOTE: The indelible ink must not cause damage to the surface of the trunnions (9). --- The part number and the serial number of the trunnion (9) must be at 0.66 in. (16.8 mm) and at 0.04 in. (1.1 mm) from the edges of the trunnion (9). --- The part number and the serial number must be in capital letters and Arabic numerals without serif fonts. --- Letter height must be 0.10 in. (2.5 mm). (i) Apply a clear polyurethane topcoat on the identification and serial number of the trunnions (9) (SRM 51---25---16). (j) Make sure that you can read the identification of the trunnions (9).

### SERVICE BULLETIN 601R---27 ---160

Page 14 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 (8) Record the serial number of the trunnions (9), the upper pins (1) and the lower pins (13) in the applicable logbooks. NOTE: To find the history of the part at the time of serialization refer to ATA Report 51---93---01 “Structural Maintenance Program Guidelines For Continuing Airworthiness” paragraph 4.6, “Removable Structural Components”. If a part has been mixed between aircraft certified at 51,000 Lb MTOW and 53,000 Lb MTOW, the intervals applicable to 53,000 Lb MTOW must apply to the part. (9) Install the HSTA (AMM 27---42---01---400---801 and the steps that follow): (a) If new P/N 601R92386---3 trunnions are installed and the diameter of the two holes of the trunnions is less than 0.375 in. (9.27 mm), do as follows: 1 Backdrill the two holes of each removed trunnion into an aluminium plate or equivalent that has a minimum thickness of 0.250 in. (6.35 mm). 2 Make sure that the diameter of the holes in the aluminium template is from 0.375 in. to 0.380 in. (9.53 mm to 9.65 mm). 3 On the trunnion surface, make sure that the location of the two holes and the center hole in the removed trunnion are aligned with the two holes and the center hole of the new trunnion. 4 Backdrill the two holes from the drilled aluminium template to each new trunnion (9). 5 Remove the burrs and sharp edges from the new trunnions (9). 6 Apply chemical conversion coating on the bare metal areas of the new trunnions (9). 7 Apply fluid-resistant primer on the bare metal areas of the new trunnions (9). (b) If the new shims (8) were peeled, apply a layer of fluid-resistant primer on the bare metal surfaces of the shims (8) (SRM 51---25---06). (c) Apply sealant on the mating faying surfaces of the shims (8) and the trunnion (9) (SRM 51---23---00). (d) Make sure that the cotter pins (2), (12), and (18), the bolts (7), (15) and (19), the nuts (11), and the washers (10) used to install the HSTA are new. (e) Torque the installed fasteners (AMM 20---21---00---910---801). NOTE: To prevent over ---torque, it is permitted to replace the washer (10) with washer P/N NAS1149F0616P or to add a washer P/N NAS1149F0616P with the washer (10).

### SERVICE BULLETIN 601R---27 ---160

Page 15 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 HSTA Pins and Trunnions --- Removal/Installation Figure 1 (Sheet 1 of 2)rsb601r27160_001.dg sd 29aout 2011 1. Upper pin 600--92384--5 (Pre--Mod) K601R92308--5 or 601R92310--3 (Post--Mod), or 600--92384--7 (Pre--Mod) K601R92308--7 or 601R92310--3 (Post--Mod), or 601R92310--1 (Pre--Mod) K601R92308--9 or 601R92310--3 (Post--Mod). 2. Cotter pin MS24665--134 (Pre--Mod) MS24665--153 (Post--Mod). 3. Nut. 4. Washer. 5. Spacer. 6. Bolt. NAS6206--14D. 8. Laminated shim 601R92303--17. 9. Trunnion. 601R92386--1 (Pre--Mod) K601R92308--19 or 601R92386--3 (Post--Mod). 10. Washer AN960--616L (Pre--Mod) NAS1149F0632P (Post--Mod). 11. Nut MS17826--6. 12. Cotter pin MS24665--134 or MS24665--283 (Pre--Mod) MS24665--300 (Post--Mod). 13. Lower pin. 600--92383--5 (Pre--Mod) K601R92308--11 or 601R92309--3 (Post--Mod) or 600--92383--7 (Pre--Mod) K601R92308--13 or 601R92309--3 (Post--Mod) or 601R92309--1 (Pre--Mod) K601R92308--15 or 601R92309--3 (Post--Mod). LEGEND

14. Bolt. 15. Bolt NAS6206--8D. 16. Washer. 17. Nut. 18. Cotter pin MS24665--134 (Pre--Mod) MS24665--153 (Post--Mod). 19. Bolt NAS6206--20D. 1

1 7 12 11 10 9 8 9

12 11 10

8 9

13

18

17 16 13 14 15 BRACKET (REF) HSTA (REF) ATTACHMENT FITTING (REF)

C 1

19
5

1 3 2 4

7. Bolt. 1 To prevent over--torque,it is permitted to replace the washer (10) with washer P/N NAS1149F0616P or to add a washer P/N NAS1149F0616P with the washer (10).

D

### SERVICE BULLETIN 601R---27 ---160

Page 16 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 HSTA Pins and Trunnions --- Removal/Installation Figure 1 (Sheet 2 of 2)rsb601r27160_002.dg sd/cr 03--aug--2012 NOTES

Upper pin P/N 601R92310--3 is supplied with a serial number. Thus, view B is not applicable to this P/N. Trunnion P/N 601R92386--3 is supplied with a serial number. Thus, view C is not applicable to this P/N. Lower pin P/N 601R92309--3 is supplied with a serial number. Thus, view D is not applicable to this P/N. 2

4 3
B 0.52 in. (13.2 mm) 0.440 in. (11.18 mm) MINIMUM 2 1

D 0.450 in. (11.43 mm) MINIMUM

0.52 in. (13.2 mm) 0.130 in. (3.30 mm) MINIMUM

0.81 in. (20.6 mm) 4 13 C 0.66 in. (16.8 mm) 0.04 in. (1.1 mm)

3 9 5

6

5 6

5 6 LEGEND 1. Upper pin 600--92384--5 (Pre--Mod) K601R92308--5 (Post--Mod), or 600--92384--7 (Pre--Mod) K601R92308--7 (Post--Mod), or 601R92310--1 (Pre--Mod) K601R92308--9 (Post--Mod). 9. Trunnion. 601R92386--1 (Pre--Mod) K601R92308--19 (Post--Mod) 13.Lower pin. 600--92383--5 (Pre--Mod) K601R92308--11 (Post--Mod) or 600--92383--7 (Pre--Mod) K601R92308--13 (Post--Mod) or 601R92309--1 (Pre--Mod) K601R92308--15 (Post--Mod). 1. The part number and the serial number must be in capital letters and arabic numerals without serif font. Letter height must be 0.10 inch (2.5mm). XXX is for the three--letter airline designator that the International Civil Aviation Organization (ICAO) gave to the airline. The Accomplishment Instructions gives an alternate for the operators that do not have an ICAO code. YYYYY is the five--d igit sequenc e number that the operator selected and recorded. If the vibro--peening method is used, the depth of the letter must be between 0.001 and 0.006 in. (0.03 and 0.15 mm). The letter Z shown in the part number is replaced with the applicable dash number listed in the legend for the upper pin (1) and the lower pin (13).

### SERVICE BULLETIN 601R---27 ---160

Page 17 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 C. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Install the access panels that follow:
ACCESS DESIGNATION REFERENCE Middle Upper Fairing Access panel AMM 55---32---05---400---806

Middle Lower Fairing Access panel AMM 55---32---05---400---807
(3) Apply external AC power to the aircraft (Refer to AMM 12---00---07---861---801). (4) Do the operational test of the HSTA trim system (AMM 27---40---00---710---802). (5) Do the functional test of the HSTCU (AMM 27---41---00---740---801). (6) Remove the applicable warning placards from the pilot’s and the copilot’s control wheels and the STAB TRIM/MACH TRIM panel. (7) When this service bulletin is completed, make this entry in the applicable logbooks: “Service Bulletin 601R---27---160, Revision A, Flight Controls --- Horizontal Stabilizer Trim Actuator (HSTA) --- Serialization of the HSTA Pins and Trunnions, incorporated.”

### SERVICE BULLETIN 601R---27 ---160

Page 18 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 3. MATERIAL INFORMATION
A. Kit Information

KIT 601R27 ---160K1 PART NUMBER QUANTITY NAME ALTERNATE PARTS NOTES

601R92303---17 3 Laminated Shim

--- ---

KIT 601R27 ---160K2 ¡
PART NUMBER QUANTITY NAME ALTERNATE PARTS NOTES
MS17826---6 9 Nut

--- --- MS24665---153 9 Cotter Pin

--- --- MS24665---300 9 Cotter Pin

--- --- NAS1149F0616P 9 Washer

--- --- NAS1149F0632P 9 Washer

--- --- NAS6206---14D 3 Bolt

--- --- NAS6206---20D 3 Bolt

--- --- NAS6206---8D 5 Bolt

--- --- ¡ The kit can contain more hardware and/or material than necessary.

### SERVICE BULLETIN 601R---27 ---160

Page 19 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 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 the shelf life of the material. CONSUMABLES SPECIFICATION QUANTITY NAME REFERENCE

--- As necessary Indelible ink Commercially available

BAMS 565---001 As necessary Fluid-resistant primer ¡ 13---007
BAMS 565---002 As necessary Polyurethane topcoat, clear ¡ 16---003
MIL ---C ---81706 As necessary Chemical conversion coating ¡ 25---025

MIL ---PRF---81733 type IV As necessary Sealant, Pressure and Environmental www.prc---desoto.com

¡ Refer to AMM 51---31---00---990---801
C. Special Tools and Equipment There are no special tools and equipment for this service bulletin.

### SERVICE BULLETIN 601R---27 ---160

Page 20 of 20 Sep 29/2011 SB 601R---27---160 Revision A, Oct 03/2012 D. Disposition of Parts The table that follows shows the disposition of installed parts on the aircraft (or spares), and the relation of installed parts (or spares) to the new parts to be installed with this service bulletin. PRE-SB PART NUMBER NAME QUANTITY DC POST-SB PART NUMBER 600---92384---5 Upper Pin 2 RWK K601R92308---5 ¡ 600---92384---7 Upper Pin 2 RWK K601R92308---7 ¡ 601R92310---1 Upper Pin 2 RWK K601R92308---9 ¡ 600---92383---5 Lower Pin 2 RWK K601R92308---11 © 600---92383---7 Lower Pin 2 RWK K601R92308---13 © 601R92309---1 Lower Pin 2 RWK K601R92308---15 © 601R92386---1 Trunnion 4 RWK K601R92308---19 ¢ ¡ P/N 601R92310---3 can replace P/N K601R92308---5, ---7, or ---9. © P/N 601R92309---3 can replace P/N K601R92308---11, ---13, or ---15. ¢ P/N 601R92386---3 can replace P/N K601R92308---19. Disposition code (DC): RWK: Rework part as shown in this service bulletin.

1THANK 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: 

##     

 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