SB 601R---27---159 Page 1 of 8 Jun 15/2011 

# 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---159 SUBJECT: Flight Controls --- Horizontal Stabilizer Trim-Actuating System --- Rework of

Horizontal Stabilizer Trim-Actuator (HSTA) P/N 601R92305---5 (P/N 8396---4) 1. PLANNING INFORMATION A. Effectivity

Service Bulletin: CL---600---2B19 aircraft with the following components

installed: Part number: 601R92305---5 (8396---4)

Part serial numbers: 287, 724, 813, 841, 998, 1031, 1035, 1049,

1053, 1067, 1068, 1136, 1252, 1268, 1303, 1319, 1338, 1354, 1374, 1378, 1445, 1470, 1498, 1513, 1546, 1632, 1736, 1766, 1846, 1849, 2002 thru 2009, 2011, 2013 thru 2016, 2019, 2020, and 2022 Installed at time of delivery on aircraft with serial numbers: 7003 thru 7067 and 7069 thru 8107

Spares: Examine all spare parts. If a part with a serial

number listed above is found, it is necessary to incorporate Sagem service bulletin 8396---27---007.

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 2 of 8 Jun 15/2011 All

CL---600---2B19 If parts with the serial numbers 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 Sagem service bulletin 8396---27---007.
Production: There is no production effectivity. 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 Bulletin(s). Before you do this bulletin, examine all STC, STA or equivalent action changes to make sure this bulletin can be completed. B. Reason (5) Condition In the Horizontal Stabilizer Trim-Actuator (HSTA), it is possible that bearing sleeves were made using an incorrect quenching process and/or primary gears have burr marks. These conditions can cause the HSTA to operate incorrectly. (6) Evidence These conditions were found in production at the supplier facility. (7) Objective/Benefit This service bulletin gives the instructions to change some internal components in the HSTA. This will prevent incorrect operation of the HSTA. C. Description Circuit breakers are opened. The HSTA is removed from the aircraft. The HSTA is reworked with Sagem Service Bulletin 8396---27---007. The HSTA is installed. Circuit breakers are closed. An operational test of the horizontal stabilizer trim-system is done. A functional test of the HSTCU is done. D. Compliance Recommended Service Bulletin. Bombardier recommends that this service bulletin be done no more than 1500 flight hours from the release date on this service bulletin, or before March 20/2012, whichever comes first, unless otherwise directed by the airworthiness authority of the operator. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs).

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 3 of 8 Jun 15/2011 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. The Fleet Services Team can be contacted via the CRC at 514---855---8500 or email at thd.crj@aero.bombardier.com. It will take an estimated 18.5 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 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 Sagem Service Bulletin 8396---27---007.

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 4 of 8 Jun 15/2011 G. Material --- Price and Availability Refer to Sagem Service Bulletin 8396---27---007. Refer to paragraph 3.B. for a list of consumables for this service bulletin. 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. 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 order parts or kits, please call Bombardier Parts Logistics at 514-855-2999 or 1-866-538-1247. I. Weight and Balance Not changed. J. Electrical Load Data Not changed. K. References Restriction and/or Special Instruction (RSI) C---A273, Revision A. Sagem Service Bulletin 8396---27---007, dated MAY 11, 2011. Aircraft Maintenance Manual. For Bombardier reference only: PCA 6501. L. Other Publications Affected Illustrated Parts Catalog (IPC). M. Relationship Chart Not applicable.

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 5 of 8 Jun 15/2011 2. ACCOMPLISHMENT INSTRUCTIONS A. Job Set---Up Reference Information

REFERENCE DESIGNATION 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 HSTA AMM 27---42---01---400---801 Installation of the HSTA (1) Obey all the electrical/electronic safety precautions (Refer to 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 (3) Install the warning placards on the control column and the STAB TRIM/MACH TRIM control panel of the pilot and copilot. B. Procedure Refer to Figure 1. (1) Remove the HSTA (Refer to AMM 27---42---01---000---801). NOTE: Refer to Sagem Service Bulletin 8396---27---007 to modify the HSTA. (2) Install the modified HSTA (Refer to AMM 27---42---01---400---801).

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 6 of 8 Jun 15/2011 C. Job Close---Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the tags and close 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 (3) Remove the warning placards from the control column and the STAB TRIM/MACH TRIM control panel of the pilot and copilot. (4) Do the operational test of the horizontal stabilizer trim system (Refer to AMM 27---40---00---710---802). (5) Do the functional test of the HSTCU (Refer to AMM 27---41---00---740---801). (6) When this service bulletin is completed, make this entry in the applicable logbook(s): “Service Bulletin 601R---27---159, Flight Controls --- Horizontal Stabilizer Trim-Actuating System --- Rework of a Horizontal Stabilizer Trim-Actuator (HSTA), incorporated.”

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 7 of 8 Jun 15/2011 Horizontal Stabilizer Trim---Actuator (HSTA) Figure 1 MONITOR CONTROL UNITrsb601r27158_001.dg, 10 May 2011 HSTA (REF)

### SERVICE BULLETIN 601R---27---159

SB 601R---27---159 Page 8 of 8 Jun 15/2011 3. MATERIAL INFORMATION
A. Kit Information None. B. Consumable Information For a list of consumables, refer to the different tasks and the Sagem service bulletin 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 Sagem service bulletin 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 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 NAME

601R92305---5 (8396---4) HSTA 1 RWI 601R92305---5 (8396---4) HSTA Disposition code (DC): RWI: Refer to Sagem Service Bulletin 8396---27---007 for instructions.
1THANK YOU FOR ANSWERING THIS EVALUATION FORM UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 450-476-7300 

### SERVICE BULLETIN EVALUATION FORM/COMPLIANCE SHEET (YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS)
SERVICE BULLETIN: 601R-27-159 ISSUE: NC

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