# Bombardier Service Bulletin 601R-27-161

Copy: Revision A ("601R-27-161 Rev A"), 12 pages: PDF https://openairdocs.org/files/sha256/70/e7/70e7ad2a27a799576e1c61f8cb0d424452c9f878cdb1025ae64a47d05f963d06; text https://openairdocs.org/service-documents/bombardier/601r-27-161/file/70e7ad2a27a7.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2014-1049; AD 2016-01-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md)
- Type: Service bulletin (Service Bulletin)
- Number: 601R-27-161
- Latest revision known: 601R-27-161, Revision A, dated January 30, 2014 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/601r-27-161

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2016-01-02](https://openairdocs.org/ad/2016-01-02.md), effective Feb 17, 2016: Revision A

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/601r-27-161/proposed.md).

## Text (12 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2014-1049; AD 2016-01-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

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 T echnologies 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.
1

### Page 2

SB 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.

### Page 3

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.

### Page 4

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.

### Page 5

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/Ns 601R92305−1, 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.

### Page 6

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 -SBPART NUMBER NAME
601R92305−1
(8396−2)
or
601R92305−3
(8396−3)
or
601R92305−5
(8396−4)
HSTA 601R92305−7(8396−5) HSTA

### Page 7

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 Overhaul Manual 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

### Page 8

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 applicable
logbooks:/quoteblleftService 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."

### Page 9

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 UNIT
rsb601r27161_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).

### Page 10

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).

### Page 11

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).
1

### Page 12

THANK YOU FOR YOUR COMMENTS
SERVICE BULLETIN FEEDBACK FORM/COMPLIANCE SHEET
( Y O U RC O M M E N T SH E L PU SW R I T EB E T T E RS E R V I C EB U L L E T I N S )
Service Bulletin No.: 601R-27-161 Revision: A
Aircraft Serial Number: Date:
STRONGL Y
DISAGREE
DISAGREE AGREE STRONGL Y
AGREE
Instructions to do the service bulletin are
accurate.
Comments:
- - - -
Figure(s), picture(s), and/or Appendix
were helpful to do the service bulletin.
Comments:
- - - -
Part(s) or kit(s) agreed with the service
bulletin requirement.
Comments:
- - - -
The service bulletin was accomplished
within the estimated time given.
Comments:
- - - -
Overall, I was satisfied with this service
bulletin.
Comments:
- - - -
Operator: Service Centre:
Name: Te l e p h o n e o r F a x :
FAX your comments or feedback to (450) 476 - - -7300
or e-mail to crj_sb_evaluation_form@aero.bombardier.com

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