SB 601R---27---161 Page 1 of 1 Jan 30/2014 

## SERVICE BULLETIN REVISION TRANSMITTAL SHEET CL ---600 ---2B19 Canadair Regional Jet (CRJ) Aircraft SERVICE BULLETIN 601R ---27 ---161

SUBJECT: Flight Controls --- Horizontal Stabilizer Trim-Actuator (HSTA) --- Installation of HSTA P/N 601R92305 ---7 (P/N 8396 ---5) This page transmits: Revision A of Service Bulletin 601R --- 27 --- 161, pages 1 thru 10, dated Jan 30/2014 The changes in this revision have no effect on aircraft that have had this service bulletin incorporated.

Reason: Revised Planning Information, paragraph 1., to: Add new statements in the Planning Information, the Accomplishment Instructions, and the Material Information sections. 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 --- 161, dated May 31/2012. Replace with the copy attached. Diacard the copy of Sagem Service Bulletin 8396---27---008, dated dated MAY 29, 2012. Refer to Sagem Service Bulletin 8396---27---008, Revision 1, dated Oct 28, 2013. Keep Aviac Technologies Service Bulletins 8396---27---001, dated FEB 01/95 and 8396---27---02, dated JAN 12/00. Service Bulletin History: Initial issue, dated May 31/2012. 1SB 601R−27−161 Page 1 of 10 May 31/2012 Revision A, Jan 30/2014 

# SERVICE BULLETIN

Technical Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT, TRANSFERRED SPARES IN THE LAST SIX MONTHS, SEND THIS SERVICE BULLETIN TO THE NEW OWNER, UNLESS CONFIRMATION WAS RECEIVED THAT BOMBARDIER HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST. SEND THIS SERVICE BULLETIN TO THE LESSEE. IF THE OPERATOR HAS SOLD AIRCRAFT OR

ATA SYSTEM: 27−42 NUMBER: 601R−27−161 SUBJECT: Flight Controls − Horizontal Stabilizer Trim-Actuator (HSTA) − Installation of HSTA P/N 601R92305−7 (P/N 8396−5)

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service: CL−600−2B19 aircraft serial numbers 7003 thru 7067, 7069 thru 7990, 8000 thru 8113. Production: Aircraft 8114 and subsequent serial numbers will have this change incorporated before delivery. NOTE: The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery of the aircraft or as changed by Bombardier Service Bulletins. Before you do this service bulletin, examine all Supplemental Type Certificates (STCs), and Supplemental Type Approvals (STAs) or equivalent action changes to make sure you can complete this service bulletin.

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 2 of 10 May 31/2012 Revision A, Jan 30/2014 B. Reason (1) Condition It is possible for the primary spur gear bolts in HSTA P/Ns 601R92305−1/−3 to become loose. It is possible that the primary spur gear in HSTA P/N 601R92305−5 is corroded. Also, the secondary gearbox housing of HSTA P/Ns 601R92305−1/−3/−5 can crack. Also, it is possible for the conditions that follow to occur: −Cracks on the HSTA primary housing −Cracks or broken teeth on the secondary spur gear −Excessive wear of the primary and the secondary pinions. The above conditions can cause the HSTA to operate incorrectly. (2) Evidence This condition was found by Sagem. (3) Objective/Benefit This service bulletin gives the instructions to do Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5. Modification of the HSTA will prevent incorrect operation of the horizontal-stabilizer trim-actuating system. C. Description The HSTA is removed. Aviac Technologies Service Bulletin 8396−27−001 or 8396−27−02 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5 are done. The HSTA is installed and return-to-service tests are done. D. Compliance Recommended Service Bulletin. For HSTA P/Ns 601R92305−1 and 601R92305−3 (P/N 8396−2 and P/N 8396−3) Bombardier recommends that this service bulletin be done at no more than 5,900 flight hours calculated from April 30/2012, or no later than November 01/2015, unless otherwise directed by the airworthiness authority of the operator. For HSTA P/Ns 601R92305−5 (P/N 8396−4) Bombardier recommends that this service bulletin be done at no more than 6,600 flight hours calculated from April 30/2012, or no later than March 04/2016, unless otherwise directed by the airworthiness authority of the operator.

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 3 of 10 May 31/2012 Revision A, Jan 30/2014 For all aircraft Bombardier recommends that Sagem Service Bulletin 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5 be done at the same time as Sagem Service Bulletin 8396−27−008 on all aircraft , except on Aircraft 7024, 7075, 7086, 7099, 7136, 7140, 7152, 7158, 7159, 7163, 7176, 7186, 7187, 7211, 7268, 7283, 7295, 7351, 7352, 7388, 7471, 7478, 7481, 7486, 7489, 7617, 7625, 7629, 7644, 7730, 7755, 7756, 7763, 8043, 8046, 8047, 8048, 8049, 8051, 8052, 8053, 8054, 8055, 8056, 8057, 8060, 8063, 8065, 8066, 8067, 8068, 8069, 8070, 8071, 8072, 8073, 8074, 8075, 8076, 8077, 8078, 8079, 8080, 8081, 8082, 8083, 8084, 8085, 8086, 8087, 8088, 8089, 8090, 8091, 8092, 8093, 8094, 8095, 8096, 8097, 8098, 8099, 8100, 8101, 8102, 8103, 8104, 8105, 8106, 8107, 8108, 8109, 8110 with an HSTA that has accumulated less than 6600 flight hours. NOTE: This service bulletin supersedes Service Bulletin 601R−27−158 (Installation of a Horizontal Stabilizer Trim-Actuator (HSTA) P/N 601R92305−5 (P/N 8396−4)). This service bulletin affects Airworthiness Limitations (AWLs) and/or Damage Tolerance Inspections (DTIs). Refer to the Maintenance Requirement Manual (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. Contact the Fleet Services Team through the CRC at 514-855-8500 or email at thd.crj@aero.bombardier.com.

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 4 of 10 May 31/2012 Revision A, Jan 30/2014 It will take an estimated 18.5 man-hours to complete this service bulletin. The man-hours are divided in the table that follows:
TASK MAN-HOURS (1) Job Set-Up 8.0 (2) Procedure N/A (3) Test 2.5 (4) Job Close-Out 8.0

NOTE: This estimate does not include the man-hours necessary to do Aviac Technologies Service Bulletins 8396−27−001, 8396−27−02 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5. G. Material − Price and Availability (1) Refer to Aviac Technologies Service Bulletin 8396−27−001, 8396−27−02 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5 for terms and conditions to do the modification of HSTA P/Ns601R92305−1, 601R92305−3, and 601R92305−5 into HSTA P/N 601R92305−7. (2) 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. 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.

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 5 of 10 May 31/2012 Revision A, Jan 30/2014 K. References Restriction and/or Special Instruction (RSI) C−A277, Revision E Modification Summary TC601R18115, Revision C Sagem Overhaul Manual OM−27−42−06−2 HSTA 8396−5 Sagem Service Bulletin 8396−27−008, Revision 1, dated Oct 28, 2013 Sagem Service Bulletin 8396−27−011, dated November 29, 2013 Aviac Technologies Service Bulletin 8396−27−001, dated FEB 01/95 Aviac Technologies Service Bulletin 8396−27−02, dated JAN 12/00 Aircraft Maintenance Manual (AMM) For Bombardier reference only: PCA 6537 and 6828 L. Other Publications Affected Airplane Flight Manual (AFM) Aircraft Illustrated Parts Catalogue (AIPC) Maintenance Requirement Manual (MRM) M. Relationship Chart

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

601R92305−1 (8396−2) or 601R92305−3 (8396−3) or 601R92305−5 (8396−4) HSTA 601R92305−7 (8396−5) HSTA

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 6 of 10 May 31/2012 Revision A, Jan 30/2014 2. ACCOMPLISHMENT INSTRUCTIONS
Reference Information

REFERENCE DESIGNATION AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions

AMM 27−42−01−000−801 Removal of the HSTA AMM 27−42−01−400−801 Installation of the HSTA
A. Job Set-Up WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. IF YOU DO NOT OBEY THE SAFETY PRECAUTIONS, INJURIES TO PERSONS AND/OR DAMAGE TO THE EQUIPMENT CAN OCCUR. (1) Obey all the electrical/electronic safety precautions (refer to AMM 24−00−00−910−801).

. Refer to Figure 1.

B. Procedure NOTE: The table that follows list the parts that are to be replaced during the incorporation of OverhaulManual OM−27−42−06−2 HSTA 8396−5:

PART NAME SAGEM PART NUMBER Primary Housing 8396−140 Secondary Housing 8396−2030 (includes P/N 261881804) Secondary Spur Gear (CH2) 261405307 Primary Pinion (CH1) 8396−043 Secondary Pinion (CH2) 8396−044

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 7 of 10 May 31/2012 Revision A, Jan 30/2014 (1) Remove the HSTA (1) (refer to AMM 27−42−01−000−801). For HSTA P/N 601R92305−1 (P/N 8396−2) NOTE: The modification of the HSTA is done with the procedure given in Aviac Technologies Service Bulletin 8396−27−001 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5. For HSTA P/N 601R92305−3 (P/N 8396−3) NOTE: The modification of the HSTA is done with the procedure given in Aviac Technologies Service Bulletin 8396−27−02 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5. For HSTA P/N 601R92305−5 (P/N 8396−4) NOTE: The modification of the HSTA is done with the procedure given in Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5. For all aircraft (2) Install the HSTA (1) (refer to AMM 27−42−01−400−801).
C. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area.

. (2) When this service bulletin is completed, make this entry in the applicablelogbooks:Service Bulletin 601R−27−161, Revision A, Flight Controls − Horizontal Stabilizer Trim-Actuator (HSTA) − Installation of HSTA P/N 601R92305−7 (P/N 8396−5), incorporated."

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 8 of 10 May 31/2012 Revision A, Jan 30/2014 HSTA − Locator Figure 1 (Sheet 1 of 1) MONITOR CONTROL UNITrsb601r27161_001.rb, 24 oct 2011 1 (REF) LEGEND 1. HSTA 601R92305

− 1 (Pre

− Mod) or 601R92305

−3 (Pre

− Mod) or 601R92305

−5 (Pre

− Mod) 601R92305

−7 (Post

− Mod).

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 9 of 10 May 31/2012 Revision A, Jan 30/2014 3. MATERIAL INFORMATION
A. Kit Information None. B. Consumable Information For a list of consumables, refer to the different tasks and the Aviac Technologies and the Sagem service bulletins given as references in this service bulletin. C. Special Tools and Equipment For a list of special tools and equipment, refer to the different tasks and the Aviac Technologies and the Sagem service bulletins given as references in this service bulletin. D. Disposition of Parts The table that follows shows the disposition of parts on the aircraft (or spares), and the relationship between these parts to the new parts to be installed through the incorporation of this service bulletin.
PRE-SB PART NUMBER NAME QTY DC POST-SB PART NUMBER NAME

601R92305−1 (8396−2) OR 601R92305−3 (8396−3) OR 601R92305−5 (8396−4) HSTA 1 RWI 601R92305−7 (8396−5) HSTA

Disposition code (DC): For HSTA P/N 601R92305−1 RWI: Rework part (refer to Aviac Technologies Service Bulletin 8396−27−001 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5).

### SERVICE BULLETIN 601R−27−161

SB 601R−27−161 Page 10 of 10 May 31/2012 Revision A, Jan 30/2014 For HSTA P/N 601R92305−3 RWI: Rework part (refer to Aviac Technologies Service Bulletin 8396−27−02 and Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5). For HSTA P/N 601R92305−5 RWI: Rework part (refer to Sagem Service Bulletins 8396−27−008, 8396−27−011 and Overhaul Manual OM−27−42−06−2 HSTA 8396−5). 1THANK YOU FOR YOUR COMMENTS 

## SERVICE BULLETIN FEEDBACK FORM/COMPLIANCE SHEET (YOUR COMMENTS HELP US WRITE BETTER SERVICE BULLETINS)

Service Bulletin No.:601R-27-161 Revision:A Aircraft Serial Number: Date:

STRONGLY DISAGREE DISAGREE AGREE STRONGLY AGREE Instructions to do the service bulletin are accurate. Comments: 

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Operator: Service Centre: Name: Telephone or Fax: FAX your comments or feedback to (450) 476 ---7300 or e-mail to crj_sb_evaluation_form@aero.bombardier.com