SB 670BA−57−024 Page 1 of 20 July 23/2014 

# 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: 57−12 NUMBER: 670BA−57−024 SUBJECT: Wings − Center Wing Secondary Structure − Inspection/Installation of the Insulation Blankets in the Upper Wing Box Area

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected:

AIRCRAFT MODEL SERVICE AIRCRAFT SERIAL NUMBERS PRODUCTION AIRCRAFT SERIAL NUMBERS CL−600−2C10 10004, 10028−10029, 10033, 10039, 10048, 10054, 10077, 10082, 10108, 10112, 10118, 10120, 10138, 10164, 10183, 10185, 10187, 10204, 10206, 10217, 10247, 10258, 10267−10268, 10270−10271, 10274−10275, 10279, 10289, 10303, 10327 None

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 2 of 20 July 23/2014 AIRCRAFT MODEL PRODUCTION AIRCRAFT SERIAL NUMBERS SERVICE AIRCRAFT SERIAL NUMBERS CL−600−2D15 and CL−600−2D24 15001, 15014, 15018−15026, 15028−15029, 15031, 15034, 15036−15059, 15063, 15065−15066, 15068, 15071, 15074, 15076−15077, 15079, 15087, 15090, 15092, 15102−15104, 15106, 15110−15115, 15117−15124, 15126−15127, 15130−15131, 15134−15145, 15148−15152, 15154−15156, 15160, 15163, 15165, 15167, 15169, 15172, 15174−15175, 15177, 15179−15180, 15183−15185, 15188−15194, 15196, 15198−15199, 15201−15202, 15204, 15209−15210, 15213−15214, 15216, 15220, 15229−15230, 15232, 15236, 15238, 15241, 15243, 15245, 15247−15249, 15251−15279 None

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 670BA−57−024

SB 670BA−57−024 Page 3 of 20 July 23/2014 B. Reason (1) Condition It is possible that the insulation blankets are not installed in the upper wing box area, and if a bleed air leak is not sensed by the bleed leak detection system and hot air goes in the direction of the adjacent structure and/or the system components, an unwanted effect on the structural and the system components can occur. (2) Evidence Some operators reported that they removed the insulation blankets from the upper wing box area during the incorporation of the initial issue or Revision A of Service Bulletin 670BA−36−016. Service Bulletin 670BA−36−016 gives the procedure to add protective shields above the insulation blankets. (3) Objective/Benefit This service bulletin gives the procedure to do an inspection of the insulation blanket installation in the upper wing box area .This will make sure that the adjacent structure and/or the system components are fully protected. C. Description This service bulletin is divided into two parts: PART A and PART B. PART A − Inspection of the Insulation Blankets in the Upper Wing Box Area Circuit breakers are opened. The wheel bins are removed. If necessary, the overwing fairings between FS697.00−FS735.00 are removed. An inspection is done to find if some insulation blankets are installed in the upper wing box area. If one or more insulation blanket(s) is/are missing, PART B of this service bulletin is done. If removed, the left and the right overwing fairings between FS697.00−FS735.00 are installed. The wheel bins are installed. The circuit breakers are closed. PART B − Installation of the Insulation Blankets in the Upper Wing Box Area Circuit breakers are opened. The wheel bins and the overwing fairings are removed. If necessary, the left and the right wing anti-ice ducts are removed. An inspection is done to find if all the insulation blankets are installed in the upper wing box area. An approved disposition is requested from Bombardier. If removed, the left and the right wing anti-ice ducts are installed. The overwing fairings and the wheel bins are installed. Circuit breakers are closed.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 4 of 20 July 23/2014 D. Compliance Bombardier recommends that PART A of this service bulletin be done at no more than 800 flight hours from the release date on this service bulletin, unless otherwise directed by the airworthiness authority of the operator. During the inspection done in PART A, if one or more insulation blanket(s) is/are missing, Bombardier recommends that PART B of this service bulletin be done at no more than 1200 flight hours from the release date on this service bulletin, unless otherwise directed by the airworthiness authority of the operator. NOTE: Initial Issue or Revision A ofService Bulletin670BA−36−016, Pneumatic − Bleed-Air Leak Detection and Warning System − Installation of ProtectiveBlankets and New Sensing Elements in the Main Landing Gear and Overwing Areas, is a prerequisite to this service bulletin. NOTE: It is not necessary to do this service bulletin if Revision B or a later revision of Service Bulletin 670BA−36−016, Pneumatic − Bleed-Air Leak Detectionand Warning System − Installation of Protective Blankets and New Sensing Elements in the Main Landing Gear and Overwing Areas, is done. NOTE: If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). 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.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 5 of 20 July 23/2014 −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 e-mail at thd.crj@aero.bombardier.com. FOR PART A It will take an estimated 3.50 man-hours to complete PART A of 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 1.00 (2) Procedure 1.50 (3) Test N/A (4) Job Close-Out 1.00
FOR PART B There are no man-hour estimates provided for PART B of this service bulletin. G. Material − Price and Availability (1) There are no kits for this service bulletin. Some parts can be necessary to accomplish the disposition supplied by Bombardier in PART B of this service bulletin and are availablefrom Bombardier.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 6 of 20 July 23/2014 (2) 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 e-mail: sbkits@aero.bombardier.com Please contact the 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. 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 Refer to the SB Introduction document for definition or explanation of service bulletin content. Restriction and/or Special Instruction (RSI) C−57−1619−00, Revision D Aircraft Maintenance Manual (AMM) For Bombardier reference only: PCA 75848 L. Other Publications Affected None. M. Relationship Chart Not applicable.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 7 of 20 July 23/2014 2. ACCOMPLISHMENT INSTRUCTIONS
PART A − Inspection of the Insulation Blankets in the Upper Wing Box Area Reference Information
REFERENCE DESIGNATION AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance AMM 53−82−82−000−801 Removal of the Overwing Fairing, FS697 − FS735 (171AL/172AR) AMM 53−82−82−400−801 Installation of the Overwing Fairing, FS697 − FS735 (171AL/172AR) AMM 53−83−89−000−801 Removal of the Main Landing Gear (MLG) Wheel Bin AMM 53−83−89−400−801 Installation ofthe Main Landing Gear (MLG) Wheel Bin A. Job Set-Up (1) Make sure that the aircraft is in standard configuration for maintenance (refer to AMM 12−00−00−867−801). (2) Remove the left and the right MLG wheel bins (refer to AMM 53−83−89−000−801).
B. Procedure Refer to Figure 1 and Figure 2. (1) Do an inspection of the upper wing box area to find if the insulation blankets are installed as follows: NOTE: Two layers of protection are installed. The insulation blanket is the bottom layer and the protective shield is the top layer. NOTE: Insulation blankets are silicone foam and fiberglass with a thickness of 0.25 in. (6.35 mm). Insulation blankets are white when they are new. NOTE: Protectiveshields are fiberglass with a thickness of 0.13 in. (3.30 mm). Protective shields are grey when they are new. NOTE: It is permitted to carefully lift the protective shield if the edge of the insulation blanket is not visible.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 8 of 20 July 23/2014 (a) Do an inspection to find if insulation blankets are installed between LBL45.00 and RBL45.00 at FS794.50. (b) Do an inspection to find if an insulation blanket is installed on the fuel vent tube at BL0.00 near FS794.50. NOTE: On the middle section of the fuel vent tube, there is a space between the left protective shield and the right protective shield. (c) Do an inspection to find if an insulation blanket is installed between FS697.00 and FS735.00, near LBL30.00 or LBL45.00. NOTE: If you cannot see an insulation blanket or you cannot get access to the inspection area, the overwing fairing, FS697.00 − FS735.00 panel 171AL can be removed (refer to AMM 53−82−82−000−801). (d) Do an inspection to find if an insulation blanket is installed between FS697.00 and FS735.00, near RBL30.00 or RBL45.00. NOTE: If you cannot see an insulation blanket or you cannot get access to the inspection area, the overwing fairing, FS697.00 − FS735.00 panel 172AR can be removed (refer to AMM 53−82−82−000−801). (2) If one or more insulation blanket(s) is/are missing, do PART B of this service bulletin. (3) For protective shields that were lifted, make sure they are lowered. (4) If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. C. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 9 of 20 July 23/2014 (2) If removed, install the access panels that follow:
PANEL NAME REFERENCE 171AL/ 172AR Overwing Fairing, FS697 − FS735 AMM 53−82−82−400−801
(3) Install the left and the right MLG wheel bins (refer to AMM 53−83−89−400−801). (4) When PART A of this service bulletin is completed, make this entry in theapplicable logbooks: Service Bulletin 670BA−57−024, Wings − Center Wing Secondary Structure − Inspection/Installation of the Insulation Blankets in the Upper Wing Box Area, PART A, incorporated."

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 10 of 20 July 23/2014 PART B − Installation of the Insulation Blankets in the Upper Wing Box Area Reference Information
REFERENCE DESIGNATION AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance AMM 30−11−06−000−801 Removal of the Supply Duct AMM 30−11−06−400−801 Installation of the Supply Duct AMM 53−82−82−000−801 Removal of the Overwing Fairing, FS697 − FS735 (171AL/172AR) AMM 53−82−82−400−801 Installation of the Overwing Fairing, FS697 − FS735 (171AL/172AR) AMM 53−82−82−000−802 Removal of the Overwing Fairing, FS735 − FS768 (171BL/172BR) AMM 53−82−82−400−802 Installation of the Overwing Fairing, FS735 − FS768 (171BL/172BR) AMM 53−82−82−000−803 Removal of the Overwing Fairing, FS768 − FS801 (171CL/172CR) AMM 53−82−82−400−803 Installation of the Overwing Fairing, FS768 − FS801 (171CL/172CR) AMM 53−83−89−000−801 Removal of the Main Landing Gear (MLG) Wheel Bin AMM 53−83−89−400−801 Installation ofthe Main Landing Gear (MLG) Wheel Bin D. Job Set-Up (1) Make sure that the aircraft is in standard configuration for maintenance (refer to AMM 12−00−00−867−801). (2) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME

CBP−1 D7 A/ICE CONT CH A CBP−1 K6 ACS CONT 2 CH A CBP−1 L1 ACS CONT 1 CH A

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 11 of 20 July 23/2014 CB PANEL NAME CB NO. CBP−2 J4 ACS CONT 1 CH B CBP−2 K6 ACS R MAN CBP−2 LOWER T1 A/ICE CONT CH B CBP−2 LOWER T7 ACS CONT 2 CH B CBP−2 LOWER T8 ACS L MAN CBP−2 N9 MLG BAY OVHT DET CBP−5 A3 APU BATT CONT (3) Remove the access panels that follow:
PANEL NAME REFERENCE 171AL/ 172AR Overwing Fairing, FS697 − FS735 AMM 53−82−82−000−801
171BL/ 172BR Overwing Fairing, FS735 − FS768 AMM 53−82−82−000−802
171CL/ 172CR Overwing Fairing, FS768 − FS801 AMM 53−82−82−000−803
(4) Remove the left and the right MLG wheel bins (refer to AMM 53−83−89−000−801). (5) If necessary, remove the applicable left and the applicable right supply duct(s) (refer to AMM 30−11−06−000−801).

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 12 of 20 July 23/2014 E. Procedure For aircraft 10004, 10028−10029, 10033, 10039, 10048, 10054, 10077, 10082, 10108, 10112, 10118, 10120, 10138, 10164, 10183, 10185, 10187, 10204, 10206, 10217, 10247, 10258, 10267−10268, 10270−10271, 10274−10275, 10279, 10289, 10303, 10327 Refer to Figure 2 and Figure 3. (1) Do an inspection of the upper wing box area to find if all the insulation blankets are installed. NOTE: Two layers of protection are installed. The insulation blanket is the bottom layer and the protective shield is the top layer. NOTE: Insulation blankets are silicone foam and fiberglass with a thickness of 0.25 in. (6.35 mm). Insulation blankets are white when they are new. NOTE: Protectiveshields are fiberglass with a thickness of 0.13 in. (3.30 mm). Protective shields are grey when they are new. NOTE: It is permitted to carefully lift the protective shield if the edge of the insulation blanket is not visible. NOTE: It is permitted to open the Velcro of the protective shield if the edge of the insulation blanket is not visible. (2) Speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. For aircraft 15001, 15014, 15018−15026, 15028−15029, 15031, 15034, 15036−15059, 15063, 15065−15066, 15068, 15071, 15074, 15076−15077, 15079, 15087, 15090, 15092, 15102−15104, 15106, 15110−15115, 15117−15124, 15126−15127, 15130−15131, 15134−15145, 15148−15152, 15154−15156, 15160, 15163, 15165, 15167, 15169, 15172, 15174−15175, 15177, 15179−15180, 15183−15185, 15188−15194, 15196, 15198−15199, 15201−15202, 15204, 15209−15210, 15213−15214, 15216, 15220, 15229−15230, 15232, 15236, 15238, 15241, 15243, 15245, 15247−15249, 15251−15279 Refer to Figure 2 and Figure 4. (3) Do an inspection of the upper wing box area to find if all the insulation blankets are installed. NOTE: Two layers of protection are installed. The insulation blanket is the bottom layer and the protective shield is the top layer.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 13 of 20 July 23/2014 NOTE: Insulation blankets are silicone foam and fiberglass with a thickness of 0.25 in. (6.35 mm). Insulation blankets are white when they are new. NOTE: Protectiveshields are fiberglass with a thickness of 0.13 in. (3.30 mm). Protective shields are grey when they are new. NOTE: It is permitted to carefully lift the protective shield if the edge of the insulation blanket is not visible. NOTE: It is permitted to open the Velcro of the protective shield if the edge of the insulation blanket is not visible. (4) Speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. For all aircraft (5) For protective shields that had Velcro opened, make sure the Velcro is closed. (6) For protective shields that were lifted, make sure they are lowered.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 14 of 20 July 23/2014 F. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) If removed, install the left and the right supply duct(s) (refer to AMM 30−11−06−400−801). (3) Remove the tags and close the circuit breakers that follow: CB PANEL CB NO. NAME

CBP−1 D7 A/ICE CONT CH A CBP−1 K6 ACS CONT 2 CH A CBP−1 L1 ACS CONT 1 CH A CBP−2 J4 ACS CONT 1 CH B CBP−2 K6 ACS R MAN CBP−2 LOWER T1 A/ICE CONT CH B CBP−2 LOWER T7 ACS CONT 2 CH B CBP−2 LOWER T8 ACS L MAN CBP−2 N9 MLG BAY OVHT DET CBP−5 A3 APU BATT CONT (4) Install the access panels that follow:
PANEL NAME REFERENCE 171AL/ 172AR Overwing Fairing, FS697 − FS735 AMM 53−82−82−400−801
171BL/ 172BR Overwing Fairing, FS735 − FS768 AMM 53−82−82−400−802
171CL/ 172CR Overwing Fairing, FS768 − FS801 AMM 53−82−82−400−803 (5) Install the left and the right MLG wheel bins (refer to AMM 53−83−89−400−801). (6) When PART B of this service bulletin is completed, make this entry in theapplicable logbooks: Service Bulletin 670BA−57−024, Wings − Center Wing Secondary Structure − Inspection/Installation of the Insulation Blankets in the Upper Wing Box Area, PART B, incorporated."

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 15 of 20 July 23/2014 Inspection of the Insulation Blankets Figure 1 (Sheet 1 of 1)ba8235a01.cgm, kp, May 27, 2014

A TYPICAL A

3 RBL30.00 FS735.00 FS697.00

LBL30.00

FS794.50 BL0.00

LBL45.00 RBL45.00

CENTER WING BOX (REF)
FUEL VENT TUBE (REF) 3 NOTES 1. Inspection areas are shaded. 2. It is permitted to carefully lift the protective shield if the edge of the insulation blanket is not visible. On the middle section of the fuel vent tube, there is a space between the left and the right protective shields.

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 16 of 20 July 23/2014 Examples of Insulation Blanket Installation Figure 2 (Sheet 1 of 2)ba8236a01.cgm, kp, May 20, 2014 A

FS794.50 RBL45.00 RBL30.00

LBL30.00

FS735.00 FS697.00

BL0.00

INSULATION BLANKET (REF) A

PROTECTIVE SHIELD (REF)

B
TYPICAL BLANKET INSTALLATION B LBL45.00

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 17 of 20 July 23/2014 Examples of Insulation Blanket Installation Figure 2 (Sheet 2 of 2)ba8236a02.cgm, kp, May 6, 2014 FS794.50 LBL45.00 RBL30.00

LBL30.00

FS735.00 FS697.00

BL0.00

INSULATION BLANKET (REF) A

PROTECTIVE SHIELD (REF)

C

TYPICAL BLANKET INSTALLATION
− FUEL VENT TUBE MIDDLE SECTION RBL45.00 C

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 18 of 20 July 23/2014 Inspection of the Insulation Blankets on CRJ700 Aircraft Figure 3 (Sheet 1 of 1) Aba8239a01.cgm, kp, May 27, 2014

C
2 LEFT SIDE SHOWN RIGHT SIDE OPPOSITE 2 NOTES 1. Protective shields not shown for clarity. Above insulation blanket not shown for clarity. 3. The shaded areas show the locations of the insulation blankets.

LEFT SIDE SHOWN RIGHT SIDE OPPOSITE B A RBL30.00

LBL30.00

FS794.50 LBL45.00 RBL45.00

CENTER WING BOX (REF) FS697.00

B

C BL0.00 B

C

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 19 of 20 July 23/2014 Inspection of the Insulation Blankets on CRJ900 Aircraft Figure 4 (Sheet 1 of 1)ba8240z01.cgm, kp, May 27, 2014 A

C
2 LEFT SIDE SHOWN RIGHT SIDE OPPOSITE 2 NOTES 1. Protective shields not shown for clarity. Above insulation blanket not shown for clarity. 3. The shaded areas show the locations of the insulation blankets.

A RBL30.00

LBL30.00

FS794.50 LBL45.00 RBL45.00

CENTER WING BOX (REF) FS697.00

B

C BL0.00

LEFT SIDE SHOWN RIGHT SIDE OPPOSITE B B

C

### SERVICE BULLETIN 670BA−57−024

SB 670BA−57−024 Page 20 of 20 July 23/2014 3. MATERIAL INFORMATION
A. Kit Information None. B. Consumable Information For a list of consumables, refer to the different tasks that are 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 that are given as references in this service bulletin. D. Disposition of Parts None. 1THANK YOU FOR YOUR COMMENTS



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Service Bulletin No.:670BA-57-024 Revision:-- Aircraft Serial Number: Date:
STRONGLY DISAGREE DISAGREE AGREE STRONGLY AGREE Instructions to do the service bulletin are accurate. Comments: 

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Figure(s), picture(s), and/or Appendix were helpful to do the service bulletin. Comments: 

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Part(s) or kit(s) agreed with the service bulletin requirement. 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