# Bombardier Service Bulletin 84-27-50 Copy: U.S. DOT/FAA - Service Bulletin - S.B. 84-27-50-RD ("U.S. DOT/FAA - Service Bulletin - S.B. 84-27-50-RD"), 18 pages: PDF https://openairdocs.org/files/sha256/41/8a/418ae49c6c49f2d905f392db3043c52757a3f831f31f68a1fe843b351c4c5e4c; text https://openairdocs.org/service-documents/bombardier/sb-84-27-50/file/418ae49c6c49.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0471; AD 2011-18-18 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: 84-27-50 - Latest revision known: 84-27-50, Revision C, dated July 26, 2010 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/bombardier/sb-84-27-50 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2011-18-18](https://openairdocs.org/ad/2011-18-18.md), effective Oct 14, 2011: Revisions A, B and C, and with none named ## Text (18 pages) Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0471; AD 2011-18-18 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) DHC-8 (DASH 8) SERVICE BULLETIN 84-27-50 Flight Controls - Elevators - Torque Tube Fastener Replacement to Eliminate Backlash in the Crank Arms - ModSum 4-113640 This page transmits Revision 'D' of Service Bulletin 84-27-50, pages 1 thru 14 dated 22 Sep 2010. This service bulletin is re-issued in its entirety for the reasons that follow: - the Description section is revised to clarify the part number inspection instructions - the References section is revised to convey the latest revision of the service bulletin and engineering documentation - the ACCOMPLISHMENT INSTRUCTIONS section is revised with clarifications to the inspection procedure, rework instructions and operational tests. The Compliance in the previous issues of this service bulletin is not affected by this revision. No additional rework to the aircraft is introduced by this revision. Remove Service Bulletin 84-27-50 Revision 'C' dated 26 Jul 2010 and replace with attached. Previous issues of Service Bulletin 84-27-50: Initial issue - Pages 1 thru 14 dated 03 Mar 2010 Revision 'A' - Pages 1 thru 14 dated 28 Apr 2010 Revision 'B' - Pages 1 thru 14 dated 19 May 2010 Revision 'C' - Pages 1 thru 14 dated 26 Jul 2010 Revision 'D' 22 Sep 2010 ### Page 2 (No text on this page.) ### Page 3 (OCR) de HAVILLAND BOMBARDIER DASH8 SERVICE BULLETIN Customer Support ATA SYSTEM: 2730 NUMBER: 84-27-50 BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS SUBJECT: Flight Controls - Elevators - Torque Tube Fastener Replacement to Eliminate Backlash in the Crank Arms - ModSum 4-113640 1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4305 Production: ModSum 4Q113640 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4306 and subsequent. 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 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 1 of 14 MG ### Page 4 (OCR) SERVICE BULLETIN 84-27-50 B. Reason Problem: Operators have reported autopilot disconnects and/or unexpected pitch oscillations. Cause: Loose rivets in the crank arms of the elevator torque tubes. Frequent reversing loads may cause freeplay to develop at the rivet joints forming a deadband in the elevator control system. This could result in vibrations, pitch oscillations and/or elevator asymmetry while under autopilot control. Solution: Replace the existing rivets with new interference fit Hi-Lite pins and collars C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - maintenance records are checked to make sure the correct elevator torque tubes have been installed - if the maintenance records do not show that the correct torque tubes have been installed, access is gained to the torque tubes located in the horizontal stabilizer - the part numbers of the torque tubes are inspected - if the part number inspection does not show that the correct torque tubes have been installed, the affected torque tubes are removed and reworked according to the instructions in this service bulletin - the torque tubes are installed and an operation test of the elevator control system is done - close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4-113640 at the earliest opportunity unless otherwise directed by the operator's airworthiness authority. 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). 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 2 of 14 MG ### Page 5 (OCR) SERVICE BULLETIN 84-27-50 F. Manpower NOTE: Total manpower hours can be reduced if the rework to the left hand and right hand torque tubes are done at the same time. Left Hand Elevator Torque Tube It will take an estimated 16.00 man-hours to complete the rework of the left hand elevator torque tube. The breakdown of man-hours is shown in the table that follows: TASK MAN -HOURS Job Set-Up 6.00 Procedure in Part A 2.50 Test / RTS 1.50 Close-Out 6.00 Right Hand Elevator Torque Tube It will take an estimated 16.00 man-hours to complete the rework of the right hand elevator torque tube. The breakdown of man-hours is shown in the table that follows: TASK MAN- HOURS Job Set-Up 6.00 Procedure in Part B 2.50 Test / RTS 1.50 Close-Out 6.00 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 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 3 of 14 MG ### Page 6 (OCR) SERVICE BULLETIN 84-27-50 G. Material - Price and Availability ModKit 8DK4160-001 is available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order specifying aircraft serial numbers) to: Bombardier Aerospace Customer Accounts Services Team (Mail Stop N11-32) 123 Garratt Blvd. Canada M3K- 1Y5 Facsimile: (416) 375-3060 Telephone: (416) 375-3920 Kit Number Description 8DK4160-001 Retrofit Kit-Torque Tube Rework, Horizontal Stab The parts) and material(s) detailed in Paragraphs) 2.A. and 2.B. 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 GSB2730003 (Drill Jig and Bushing) will be provided free of charge. I. Weight and Balance None J. Electrical Load Data Not affected 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 4 of 14 MG ### Page 7 (OCR) SERVICE BULLETIN 84-27-50 K. Publications Affected Dash 8 Illustrated Parts Catalogue ........... PSM 1-84-4 ModSums Manual .... PSM 1-84-12 References Revision 'D' of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8DK4160 1 _ _ 826850 1 C ModSum 4Q113640 Rev. 'E' ModSum 4-113640 Rev. 'E' PCA 42934 Revision 2 (for internal reference only) 2. MATERIAL INFORMATION A. Parts Required Per Aircraft (1) Drawing Kit 8DK4160-001, Retrofit Kit - Torque Tube Rework, Horizontal Stab (2) Detailed Kit Content: Quantity Per Kit Part Number Description -001 1 8Z6850 Retrofit Drawing - Torque Tube Assembly, Horizontal Stab (3) In addition to the above parts), the following material(s) are required for the completion of this service bulletin and may be procured as single items from Bombardier Aerospace Regional Aircraft or purchased directly from industry sources. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 5 of 14 MG ### Page 8 (OCR) SERVICE BULLETIN 84-27-50 Addresses of manufacturers and suppliers not shown below are listed in either Maintenance Manual Chapter 20 or in Structural Repair Manual Chapter 51 or, for 400 Series Aircraft, in Consumable Products Manual PSM 1-84-18. Part Number Qty. Per Aircraft Description Remarks MS16624-4031 2 Retaining Ring C1 1/4 Pint Alodine 1200 MIL-C-5541 DHMS C4.01 1/4 Pint Epoxy Primer Type 2 MS21042L3 4 Nut B0206001AG8-20 or HST10AG8-20 21 Hi-Lite Pin or AL10AG8-20 HST1070CY-8 or B0206016CY8 21 Collar or HST1479CY8 B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 6 of 14 MG ### Page 9 (OCR) SERVICE BULLETIN 84-27-50 D. Existing Parts Accountability The following parts may be affected by this service bulletin. Indented parts are components of the next higher assembly. The quantity (Qty.) column lists the quantity that may be affected per aircraft for non-indented parts and the quantity per next higher assembly for indented parts. Existing New Part Part Number Description Qty. IC DC Number PNC 82760709-009 Torque Tube Ass'y, 1 C RWK 82760709-011 R Left Elevator Control 82760757-009 Torque Tube Ass'y, 1 C IRWK 82760757-011 R Right Elevator Control C Interchangeability Code Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition DIS Discard Part. MUI Multiple Usage.Item: Return to stock if serviceable. RWK Rework existing part in accordance with this service bulletin. RWI Rework existing part per .... SAL Salvage. Return to operator's stores for salvage consideration. PNC Part Number Code N No equivalent Bombardier Inc. part number for reworked part. Indicate on part that this service bulletin has been accomplished. Part number after rework. Superseding or equivalent part number. Reworked part and superseding part are functionally and physically equivalent but not identical. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 7 of 14 MG ### Page 10 (OCR) SERVICE BULLETIN 84-27-50 3. ACCOMPLISHMENT INSTRUCTIONS NOTE: The elevator torque tubes are not serialized components and can either be reworked and reinstalled or reworked and installed on another aircraft. NOTE: The Procedure section of the ACCOMPLISHMENT INSTRUCTIONS is divided into Left Hand Torque Tube Rework and Right Hand Torque Tube Rework sections. The operator has the option to rework each torque tube assembly separately on different work shifts or rework both torque tubes at the same time. A. Job Set-Up (1) Before starting work, inspect all maintenance records to determine if the L/H and R/H elevator torque tubes have previously been replaced with part number 82760709-011 (L/H) and 82760757-011 (R/H). No further action is required if the torque tubes have been replaced; go to Close Out section. (2) Placard and select all aircraft electrical power to OFF. Refer to AMM TASK's 24-00-00-861-802 and 24-00-00-910-801 and obey all relevant WARNINGS and CAUTIONS. (3) Make sure that lock pins are installed thru each main gear and main gear door mechanism. (4) Make sure the nose gear ground lock is engaged. B. Procedure NOTE: Refer to Figure 1 and drawing 8Z6850 when doing the rework of the left and right hand elevator torque tubes. Left Hand Torque Tube Rework (1) Open and tag the the circuit breakers that follow: CB PANEL AND CB NUMBER NAME LEFT DC ESS, G4 PITCH-TRIM ACT 1 LEFT DC ESS, H4 PITCH-FEEL ACT 1 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 8 of 14 MG ### Page 11 (OCR) SERVICE BULLETIN 84-27-50 (2) Open the access panels that follow: REFERENCE DESIGNATION 322EL Access Panel 332DB Access Panel 332EB Access Panel 332HB Access Panel (3) Locate and inspect the part number of the left hand elevator torque tube. If the part number is 82760709-011 no further work is required and access panels can be closed. Go to Right Hand Torque Tube Rework section. NOTE: Make sure the elevator control surface is supported after the last PCU is removed as it will drop to its structural stop. (4) If the elevator torque tube part number is 82760709-009, refer to AMM TASK 27-31-46-000-801 and remove elevator torque tube 82760709-009 from left hand side. Remove balance masses and keep all hardware. Discard existing retaining ring. NOTE: Not all M7885/8-6 rivets on the torque tube are removed. Remove only the rivets which are shown in the drawing to be replaced by Hi Lites. (5) Refer to the applicable section in SRM TASK 51-42-45-02-01 and at each location shown in drawing 8Z6850-VIEW L-L remove indicated rivets M7885/8-6. Shake out any severed rivet stems that may have fallen inside the torque tube. (6) Connect the two torque tube halves and make sure the two bolts NAS6203 are tightened on the sleeve 82760713. (7) Clamp the torque tube assembly to a flat surface at the three PC crank arm locations to keep alignment. (8) Put drill guide with bushing into existing rivet holes opened up in step 5. Using a #40 drill bit, open the opposite wall of the torque tube by drilling through the drill bushing. Remove drill guide with bushing and using a #1 drill bit, open both holes to 0.228 inches diameter. Using a pilot reamer, open the hole to 0.2450/0.2480 inches diameter. (9) Refer to SRM TASK 51-40-15-02-01 and ream/deburr the holes to 0.2450/0.2480 inches diameter. (10) Unclamp torque tube assembly from work surface. Remove the two bolts NAS6203 and sleeve 82760713. Keep all hardware. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 9 of 14 MG ### Page 12 (OCR) SERVICE BULLETIN 84-27-50 (11) Separate the two torque tube halves and clean out metal swarf with a vacuum or compressed air. (12) Refer to SRM TASK 51-40-15-02-01 and using an arbor press or padded bench vise install a Hi-Lite pin B0206001AG8 with collar HST1070CY-8 in each thru hole. Hammering is prohibited. Hi-Lite orientation shall match drawing 8Z6850 SECTION A-A, SECTION B-B, SECTION C-C and SECTION D-D. (13) Visually inspect the torque tube for missing finish. Refer to AMM TASK 51-25-16-390-801 and TASK 51-25-26-370-801 and touch up exposed metal areas with brush alodine 12005 and epoxy polymide primer. (14) Refer to AMM 20-00-01-910-801 and at the part mark location, cross out existing part number and re-identify left hand elevator torque tube 82760709-009 as 82760709-011. (15) If using a new torque tube instead of a reworked tube, move hardware from existing crank arms (attached to PCU input bungees and centering spring pin drive) to new torque tube. (16) Refer to AMM TASK 27-31-46-400-801 and install left hand elevator torque tube 82760709-011 with balancing masses and kept hardware. Use two new nuts MS21042L3 to install sleeve 82760713. (17) Refer to AMM TASK 27-31-36-830-801 and rig the left hand side elevator PCU's. (18) Refer to TASK 27-31-51-830-801 and rig the left hand elevator centering device. (19) Remove tags and close the the circuit breakers that follow: CB PANEL AND CB NUMBER NAME LEFT DC ESS, G4 PITCH-TRIM ACT 1 LEFT DC ESS, H4 PITCH-FEEL ACT 1 (20) Refer to AMM 27-30-00-710-801 and the steps that follow and do an operational test of the elevator control system. (a) Make sure that through the full range of travel a minimum clearance of 0.12 inches exists between the torque tube and its surrounding structure. (b) Specifically inspect clearance between left hand side #1 hydraulic return line and inboard Hi-Lite collar on the centering spring crank arm. (c) Make sure a minimum clearance of 0.065 inches exists between the torque tube and the center PCU when the PCU is fully retracted (elevator trailing edge up). (21) Close the access panels that follow: 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 10 of 14 MG ### Page 13 (OCR) SERVICE BULLETIN 84-27-50 REFERENCE DESIGNATION 322EL Access Panel 332DB Access Panel 332EB Access Panel 332HB Access Panel Right Hand Torque Tube Rework (22) Open and tag the the circuit breakers that follow: CB PANEL AND CB NUMBER NAME RIGHT DC ESS, G4 PITCH-TRIM ACT 2 RIGHT DC ESS, H4 PITCH-FEEL ACT 2 (23) Open the access panels that tollow: REFERENCE DESIGNATION 322ER Access Panel 342DB Access Panel 342EB Access Panel 342HB Access Panel (24) Locate and inspect the part number of the right hand elevator torque tube. If the part number is 82760757-011 no further work is required and access panels can be closed. Go to Close Out section. NOTE: Make sure the elevator control surface is supported after the last PCU is removed as it will drop to its structural stop. (25) If the elevator torque tube part number is 82760757-009, refer to AMM TASK 27-31-46-000-801 and remove elevator torque tube 82760757-009 from right hand side. Remove balance mass and keep all hardware. Discard existing retaining ring. NOTE: Not all M7885/8-6 rivets on the torque tube are removed. Remove only the rivets which are shown in the drawing to be replaced by Hi-Lites. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 11 of 14 MG ### Page 14 (OCR) SERVICE BULLETIN 84-27-50 (26) Refer to the applicable section in SRM TASK 51-42-45-02-01 and at each location shown in drawing 8Z6850-VIEW R-R remove indicated rivets M7885/8-6. Shake out any severed rivet stems that may have fallen inside the torque tube. (27) Connect the two torque tube halves and make sure the two bolts NAS6203 are tightened on the sleeve 82760713. (28) Clamp the torque tube assembly to a flat surface at the three PCU crank arm locations to keep alignment. (29) Put drill guide with bushing into existing rivet holes opened up in step 26. Using a #40 drill bit, open the opposite wall of the torque tube by drilling through the drill bushing. Remove drill guide with bushing and using a #1 drill bit, open both holes to 0.228 inches diameter. Using a pilot reamer, open the hole to 0.2450/0.2480 inches diameter. (30) Refer to SRM TASK 51-40-15-02-01 and ream/deburr the holes to 0.2450/0.2480 inches diameter. (31) Unclamp torque tube assembly from work surface. Remove the two bolts NAS6203 and sleeve 8276013. Keep all hardware. (32) Separate the two torque tube halves and clean out metal swarf with a vacuum or compressed air. (33) Refer to SRM TASK 51-40-15-02-01 and using an arbor press or padded bench vise install a Hi-Lite pin B0206001AG8 with collar HST1070CY-8 in each thru hole. Hammering is prohibited. Hi-Lite orientation shall match drawing 8Z6850 SECTION F-F, SECTION G-G, SECTION H-H and SECTION K-K. (34) Visually inspect the torque tube for missing finish. Refer to AMM TASK 51-25-16-390-801 and TASK 51-25-26-370-801 and touch up exposed metal areas with brush alodine 1200S and epoxy polymide primer. (35) Refer to AMM 20-00-01-910-801 and at the part mark location, cross out existing part number and re-identify right hand elevator torque tube 82760757-009 as 82760757-011. (36) If using a new torque tube instead of a reworked tube, move hardware from existing crank arms (attached to PCU input bungees and centering spring pin drive) to new torque tube. (37) Refer to AMM TASK 27-31-46-400-801 and install right hand elevator torque tube 82760757-011 with balancing masses and kept hardware. Use two new nuts MS21042L3 to install sleeve 82760713. (38) Refer to AMM TASK 27-31-36-830-801 and rig the right hand side elevator PCU's. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 12 of 14 MG ### Page 15 (OCR) SERVICE BULLETIN 84-27-50 (39) Refer to TASK 27-31-51-830-801 and rig the right hand elevator centering device. (40) Remove tags and close the the circuit breakers that follow: CB PANEL AND CB NUMBER NAME RIGHT DC ESS, G4 PITCH-TRIM ACT 2 RIGHT DC ESS, H4 PITCH-FEEL ACT 2 (41) Refer to the steps that follow and AMM 27-30-00-710-801 and do an operational test of the elevator control system. (a) Make sure that through the full range of travel a minimum clearance of 0.12 inches exists between the torque tube and its surrounding structure. (b) Specifically inspect clearance between right hand side #2 hydraulic return line and inboard Hi-Lite collar on the centering spring crank arm. (c) Make sure a minimum clearance of 0.065 inches exists between the torque tube and the center PCU when the PCU is fully retracted (elevator trailing eage up). (42) Close the access panels that follow: REFERENCE DESIGNATION 322ER Access Panel 342DB Access Panel 342EB Access Panel 342HB Access Panel C. Close Out (1) Make sure the nose gear ground lock is disengaged and the lock pins are removed from each main gear and main gear door mechanism. (2) Remove all tools and equipment from the work area. (3) On incorporation of this ModSum make an entry that conforms to local regulatory requirements in the applicable logbooks). If only part of this ModSum is completed, use only this service bulletin number as reference and detail exact limit of work completed. Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin. 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 13 of 14 MG ### Page 16 (OCR) SERVICE BULLETIN 84-27-50 LEGEND 1. Inboard elevator torque tube. 23. Sleeve. 2. Outboard elevator torque tube. 24. Nut. 19. Nut. 25. Washer. 20. Washer. 26. Bolt. 21. Washer. 27. Support assembly. 22. Bolt. 28. Centering device. 29. Retaining Ring 23 20- 19 29 STRUCTURE (REF) 26 28 J NOTE: PRE MODSUM 4-113482 CENTERING DEVICE SHOWN. POST MODSUM DEVICE LACKS COVER Elevator Torque Tube Figure 1 03 Mar 2010 S.B. 84-27-50 Revision 'D' 22 Sep 2010 Page 14 of 14 MG ### Page 17 (OCR) BOMBARDIER SERVICE BULLET SERIES DASH AIR ATOR PORATION To: Partner Data Co-Ordinator (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 3534 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 Jan 2009 ### Page 18 (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 2009 --- 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.