# Bombardier Service Bulletin 84-24-52 Copy: No revision named ("U.S. DOT/FAA - Service Information"), 14 pages: PDF https://openairdocs.org/files/sha256/31/4e/314e207b140d1e1715bbd1a7967c90b29b8a16e27f43eca6fef6a063229e4b6e; text https://openairdocs.org/service-documents/bombardier/sb-84-24-52/file/314e207b140d.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0037; AD 2012-02-12 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: 84-24-52 - Page: https://openairdocs.org/service-documents/bombardier/sb-84-24-52 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2012-02-12](https://openairdocs.org/ad/2012-02-12.md), effective Feb 15, 2012: No revision named ## Text (14 pages) Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0037; AD 2012-02-12 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) de HAVILLAND BOMBARDIER DASH8 Customer. Support ATA SYSTEM: 2400 NUMBER: 84-24-52 BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS SUBJECT: Electrical Power - Special Inspection and Rectification - Wiring Installation Front Fuse - Harness Segregation and Installation of Conduit - AC Power Wires - ModSum 4-126552 1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4095 thru 4391. Production: ModSum 4-126552 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4392 and subsequent. 22 Nov 2011 S.B. 84-24-52 Page 1 of 12 JR ### Page 2 (OCR) SERVICE BULLETIN 84-24-52 NOTE: The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery on the aircraft or as changed by Bombardier Aerospace Service Bulletin(s). Before you do this bulletin, examine all STC or equivalent action changes to make sure this bulletin can be completed. Spares Affected: None B. Reason Problem: There has been multiple reports of operators losing certain AC systems along with associated circuit breakers popping. Troubleshooting lead to burnt wiring being found under the floor (at the cockpit door). In each case, the same wire bundle was found burnt in the same area/location. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - aircraft is put into standard configuration for maintenance - aircraft electrical power is removed - the nose landing gear lock is engaged - the main landing gear lock pins are installed thru each main gear and main gear door mechanism - a floor board is removed - the wiring harness is inspected - separation of single AC harness into two bundles between two clipping points - installation of protective teflon conduit on each bundle - segregate the two bundles with connector ring and tie straps - close out. D. Compliance Bombardier Inc. highly recommend that ModSum 4-126552 be incorporated at the earliest opportunity unless otherwise directed by the operator's airworthiness authority. A Transport Canada Airworthiness Directive Pending. 22 Nov 2011 S.B. 84-24-52 Page 2 of 12 JR ### Page 3 (OCR) SERVICE BULLETIN 84-24-52 E. Approval The technical content of this service bulletin has been approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization No: DAO #93-Q-02. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTS). F. Manpower It will take an estimated 2.5 man-hours to complete this service bulletin. The breakdown of the man-hours is shown in the table that follows: TASK MAN-HOURS Job Set-Up 0.25 Procedure 2.00 Test / RTS 0.00 Close-Out 0.25 For any on-site labor assistance, please speak with a Fleet Services representative for a quote. The Fleet Services group can be contacted via the Q Series Technical Help Desk by telephone at 416-375-4000 or email at: thd.qseries@aero.bombardier.com G. Material - Price and Availability The parts detailed in Paragraph 2.A. may be either furnished or fabricated from the operator's existing stock, purchased as single items from Bombardier Aerospace Regional Aircraft or purchased directly from industry sources. DK parts are to be manufactured and approved locally (refer to disclaimer in the related text or illustration). In some cases, an equivalent to the DK part may be available from Bombardier under the production part number shown as reference in Parts Required Per Aircraft. H. Tooling - Price and Availability None Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected ModSums Manual ........... PSM 1-84-12 22 Nov 2011 S.B. 84-24-52 Page 3 of 12 JR ### Page 4 (OCR) SERVICE BULLETIN 84-24-52 L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8DK4191 1 B 8Z9486 1 C ModSum 4Q126552 Rev. 'D' ModSum 4-126552 Rev. 'D' PCA 43844 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive Pending. 2. MATERIAL INFORMATION A. Parts Required Per Aircraft (1) Detailed Parts List: Quantity Part Number Description Remarks Per Aircraft 1 roll MIL-I-19166 Fiberglass Tape 16 B0816038-002 Connector Ring see Note 1 40 B0816019-003 Tie Straps see Note 2 5 ft S10155H11 Conduit/Teflon AMS3655 Tubing NOTE 1: It is acceptable to use connector ring P/N CR4H as an alternative (Panduit Cage Code 06383). 22 Nov 2011 S.B. 84-24-52 Page 4 of 12 JR ### Page 5 (OCR) SERVICE BULLETIN 84-24-52 NOTE 2: It is acceptable to use tie straps P/N PLT2S-76 as an alternative (Panduit Cage Code 06383). B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None 3. ACCOMPLISHMENT INSTRUCTIONS A. Job Set-Up WARNING: YOU MUST INSTALL THE LOCKPINS ON THE MAIN LANDING GEAR. MAKE SURE YOU ENGAGE THE NOSE GEAR LOCK. IF YOU DO NOT DO THIS, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. WARNING: YOU MUST INSTALL THE LOCKPINS IN THE DOOR MECHANISMS OF THE MLG AND NG. THE DOOR MECHANISMS CAN ACCIDENTALLY CLOSE THE LANDING GEAR DOORS. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. WARNING: YOU MUST INSTALL THE LOCKPINS ON THE LANDING GEAR DOORS. MAKE SURE YOU DISCONNECT THE LANDING GEAR DOORS. IF YOU DO NOT DO THIS THE LANDING GEAR DOORS WILL CLOSE WHEN YOU APPLY THE HYDRAULIC PRESSURE. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. (1) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS (refer to AMM TASK'S 24-00-00-861-802 and 24-00-00-910-801). (2) Make sure that lock pins are installed through each main gear and main gear door mechanism. 22 Nov 2011 S.B. 84-24-52 Page 5 of 12 JR ### Page 6 (OCR) SERVICE BULLETIN 84-24-52 (3) Make sure the nose gear ground lock is engaged. B. Procedure (1) Remove passenger compartment floor panel 133AZ. Refer to Maintenance Manual Task 06-43-00-992-801. (2) Remove existing tie straps on harness shown inside the area of Detail B on View A Figure 2 between stringer 31S right hand side and stringer 31P left hand side. (3) Do a visual inspection of every wire in that harness for the following conditions: - foreign object damage (FOD) -damage due to sharp bends and kinking or deterioration -condition of insulation for cracking -evidence of heat damage to the insulation -chafing (4) If any of the above conditions is found, repair wire in accordance with wiring standard practices. Refer to Wiring Diagram Manual PSM 1-84-2W Chapter 20. (5) Send the results of the inspection and any repairs, including the identification codes and location of the repaired wires, to the Q Series Help Desk (thd.qseries@aero.bombardier.com) for analysis. Divide the single bundle into two bundles per Table 1, where each bundle has the wire waycodes identified as shown in Section D-D of Figure 4. Cut the (S10155H11) Teflon tubing to length as shown on "Detail B" of Figure 3. Carefully cut the Teflon tubing down its length. Wrap the tubing around the cable harness. Orient the overlap downward as shown to prevent ingress of moisture into the conduit. Secure conduit on each end with fiberglass tape MIL-I-19166 and tie strap B0816019-003 (or PLT2S-76). Secure the rest of the conduit with tie straps approximately every 4 inches. (9) Dress up harness and for each location shown in detail B, sections C-C of Figure 3, install two connector rings B0816038-002 (or CR4H) using three tie straps B0816019-003 (or PLT2S-76). NOTE: For indicated bundle run, a minimum separation of 0.500 inches must be maintained between bundle #1 and bundle #2. (10) Check harness to make sure there is adequate clearance between adjacent harnesses and structures. 22 Nov 2011 S.B. 84-24-52 Page 6 of 12 JR ### Page 7 (OCR) SERVICE BULLETIN 84-24-52 C. Close Out (1) Remove all tools and equipment from the work area. (2) Install passenger compartment floor panel 133AZ. Refer to Maintenance Manual Task 06-43-00-992-801. (3) On incorporation of this ModSum, make an entry that conforms to local regulatory requirements in the applicable logbooks). Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin. 22 Nov 2011 S.B. 84-24-52 Page 7 of 12 JR ### Page 8 (OCR) SERVICE BULLETIN 84-24-52 THE DESIGN OF THE PART IN THIS DRAWING HAS BEEN APPROVED BY DE HAVILLAND INC. FOR MANUFACTURE BY OR ON BEHALF OF INCLUDING WITHOUT LIMITATION LOSS OR USE, LOSS OF REVENUE OR LOSS OF PROFIT, ARISING FROM SUCH MANUFACTURE, INCORPORATION AND INSTALLATION. Y=0. 00 00000 - 39. 00 UNDERFLOOR TRESHOLD Work Location Figure 1 22 Nov 2011 S.B. 84-24-52 Page 8 of 12 JR ### Page 9 (OCR) SERVICE BULLETIN 84-24-52 STR 28S STR 29S (N18) STR 30S DETAIL B STR 31S VIEW ON A (VIEW LKG DOWN) (ROTATED 90° CW) Figure 2 STR 32S STR 32P OUTBD STR 31P 22 Nov 2011 S.B. 84-24-52 Page 9 of 12 JR ### Page 10 (OCR) SERVICE BULLETIN 84-24-52 Y=12. 850 X--39.00 L MIL-1-19166. FIBERGLASS TAPE STR 31S U A For indicated bundle run, a minimum separation of 0.500 inches must be maintained between bundle #1 and bundle #2. STR 32S W17 WID, WIM, W1P, V9 DETAIL B Figure 3 STR 32P TV10.414 F TIE STRAP B0816038-002 OR PLT2S-76 15 REQUIRED MIBERCLASS TAPE 22 Nov 2011 S.B. 84-24-52 Page 10 of 12 JR ### Page 11 (OCR) SERVICE BULLETIN 84-24-52 CONDUIT S10155H11 W10. W14. - W11. W15 ENSURE THE CONDUIT OVERLAP FACES DOWNWARD FOR MOISTURE DRAINAGE. SECTION D-D NOTE: SEE WIRE LIST CONNECTOR RING B0816038-002 OR CR4H 2 REQUIRED TIE STRAP B0816038-002 OR PLT2S-76 3 REQUIRED SECTION C-C TYP 6 PLACES Figure 4 22 Nov 2011 S.B. 84-24-52 Page 11 of 12 JR ### Page 12 (OCR) SERVICE BULLETIN 84-24-52 WIRE LIST BUNDLE #1 - (W10, W14) BUNDLE #2 • (W11, W15) 2730-0821-20-1 2800-T14A-20-1 BLU 2800-T11A-20-1 BLU 2800-T14A-20-1 RED 2800-T11A-20-1 RED 2800-T14A-20-1 YEL 2800-T11A-20-1 YEL 3000-40A-16-1 2800-T200B-20-1 BLU 3000-93A-20-1 2800-T200B-20-1 RED 3000-98A-20-1 2800-T200B-20-1 YEL 3000-10A-16-1 3041-4B-12-1 3000-1C-16-1 3041-7B-12-1 3000-4C-16-1 3000-95C-20-1 3000-97A-20-1 3410-0871A-20-1 3041-5B-12-1 3041-6B-12-1 Table 1 22 Nov 2011 S.B. 84-24-52 Page 12 of 12 JR ### Page 13 (OCR) BOMBARDIER SERVICE BULLETIN (SB) - RECORD OF INCORPORATION - Q SERIES DASH 8 AIRCRAFT To: CMDB Focal Facsimile: (1) 416 375 4538 E-mail: cmdb.requests@aero.bombardier.com From: Company: Phone: Extn: Facsimile: Date: E-mail: The data that you provide below will help us record the incorporation of this ModSum and the aircraft effectivity in the maintenance manual. Operator: _Service Bulletin: Revision: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Fax this sheet to (1) 416 375 4538 or Email PDF to: cmdb.requests@aero.bombardier.com ### Page 14 (OCR) BOMBARDIER SERVICE BULLETIN (SB) - COMMENT SHEET - Q SERIES DASH 8 AIRCRAFT To: SB Focal (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 4078 Facsimile: (1) 416 375 4538 E-mail: syed.rizvi@aero.bombardier.com From: Company: Phone: Extn: Facsimile: Date: E-mail: Select appropriate boxes) and add comments or suggestions you would like us to know that may enhance the quality of our service bulletins. Service Bulletin: _ Revision: ModSum: 1. PLANNING INFORMATION • Effectivity • Reason • Description • Compliance • Approval • Manpower • Material • Weight and Balance • Electrical Load • Tooling • References • Publications Affected 2. MATERIAL INFORMATION • Kit Content • Special Tools/Equipment • Parts to Modify Spares • Consumables • Disposition of Existing Parts • Other 3. ACCOMPLISHMENT INSTRUCTIONS • Job Set-Up • Procedure • Close-Out • Test • Illustration(s) • Other 4. COMMENTS, REMARKS, SUGGESTIONS Fax this sheet to (1) 416 375 4538 or Email PDF to: syed.rizvi@aero.bombardier.com Feb 2008 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.