# Bombardier Service Bulletin 84-32-55 Copy: Revision A ("U.S. DOT/FAA - Service Bulletin 84-32-55--RA"), 13 pages: PDF https://openairdocs.org/files/sha256/80/3d/803dc94cc8434b5d396a712310135e5a2829d3571bbe4fe275b42e7aec41a6dc; text https://openairdocs.org/service-documents/bombardier/sb-84-32-55/file/803dc94cc843.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0151; AD 2011-17-17 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: 84-32-55 - Latest revision known: 84-32-55, Revision A, dated March 10, 2008 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/bombardier/sb-84-32-55 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2011-17-17](https://openairdocs.org/ad/2011-17-17.md), effective Oct 18, 2011: Revision A Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-84-32-55/proposed.md). ## Text (13 pages) Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-0151; AD 2011-17-17 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 84-32-55 Landing Gear - Main Landing Gear - Retraction Actuator Assembly - Introduction of New Configuration - ModSum 4-901603 This page transmits Revision 'A' of Service Bulletin 84-32-55, pages 1 thru 10 dated 10 Mar 2008. This service bulletin is re- issued in its entirety for the reasons that follow: - the Effectivity section is revised with the deletion of prerequisite production modsums - the References section is revised to convey the latest revision of the service bulletin and engineering documentation - removed and replaced original vendor service bulletin with a revised vendor service bulletin The Compliance in the previous issue of this service bulletin is not affected by this revision. No additional rework to the aircraft is introduced by this revision. Remove Service Bulletin 84-32-55 Initial Issue dated 14 Jan 2008 and replace with attached. Previous issue(s) of Service Bulletin 84-32-55: Initial issue - Pages 1 thru 8 dated 14 Jan 2008 Revision 'A' 10 Mar 2008 ### Page 2 (OCR) de HAVILLAND BOMBARDIER DASH8 SERVICE BULLETIN Customer. Support ATA SYSTEM: 3231 NUMBER: 84-32-55 SUBJECT: Landing Gear - Main Landing Gear - Retraction Actuator Assembly - Introduction of New Configuration - ModSum 4-901603 1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006 and 4008 thru 4182 with -deleted - Service Bulletin 84-32-53. Production: ModSum 4-901603 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4183 and subsequent. Spares Affected: None B. Reason Solution: Service Bulletin 84-32-53 introduced steps to prevent corrosion in the piston rod of the main landing gear retraction actuator. To complete the process started by Service Bulletin 84-32-53, a new configuration retraction actuator assembly with a new piston manufactured from stainless steel is introduced. 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 1 of 10 ### Page 3 (OCR) SERVICE BULLETIN 84-32-55 C. Description The procedures in this service bulletin give the instructions to do the tasks that tollow: - put the aircraft into standard configuration for maintenance - disconnect the retraction actuator from the shock strut of the left or right main landing gear - disassemble the retraction actuator, install the new piston, assemble the retraction actuator and test the actuator according to the enclosed vendor service bulletin - connect the retraction actuator to the shock strut of the left or right main landing gear - repeat the steps for the opposite main landing gear - do an operational test of the left and right hand main landing gear - close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4-901603 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. F. Manpower It will take an estimated 8.00 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 1.00 Procedure 5.00 Test / RTS 1.00 Close- Out 1.00 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 2 of 10 ### Page 4 (OCR) SERVICE BULLETIN 84-32-55 G. Material - Price and Availability Refer to enclosed Goodrich Service Bulletin 46550-32-57. H. Tooling - Price and Availability Refer to enclosed Goodrich Service Bulletin 46550-32-57. I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue ........ ............ PSM 1-84-4 ModSums Manual .. ............ PSM 1-84-12 References Revision 'A' of this service bulletin was prepared to the engineering drawings and related data that follows: ModSum 4Q901603 Rev. 'A' ModSum 4-901603 Rev. 'A' PCA 42114 Revision 1 (for internal reference only) PCA 42135 Revision 0 (for internal reference only) Goodrich Service Bulletin 46550-32-57 Nov 07/07 2. MATERIAL INFORMATION A. Parts Required Per Aircraft Refer to enclosed Goodrich Service Bulletin 46550-32-57. 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 3 of 10 ### Page 5 (OCR) SERVICE BULLETIN 84-32-55 B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability Refer to enclosed Goodrich Service Bulletin 46550-32-57. 3. ACCOMPLISHMENT INSTRUCTIONS A. Job Set-Up WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED. IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. WARNING: BE SURE THAT THE HYDRAULIC PRESSURE IS OFF, AND THAT THERE IS NO PRESSURE IN THE HYDRAULIC SYSTEM. IF YOU DO NOT DO THIS YOU CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. (1) Refer to Aircraft Maintenance Manual PSM 1-84-2 TASK 12-00-01-860-801 and put the aircraft into standard configuration for maintenance. (2) Refer to PSM 1-84-2 TASK 07-10-00-582-801 and put the aircraft on jacks. B. Procedure (1) Refer to PSM 1-84-2 TASK 32-31-11-000-801 and disconnect the retraction actuator from the shock strut and yoke assembly. (2) Rework the retraction actuator to agree with all of the notes and details given in enclosed Goodrich Service Bulletin 46550-32-57. (3) Refer to PSM 1-84-2 TASK 32-31-11-400-801 and connect the retraction actuator to the shock strut. (4) Repeat steps 1 thru 3 for the opposite main landing gear. C. Close Out (1) Refer to PSM 1-84-2 TASK 32-31-00-710-801 and do a operational test of the main landing gear. 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 4 of 10 ### Page 6 (OCR) SERVICE BULLETIN 84-32-55 (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). Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin. 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 5 of 10 ### Page 7 (OCR) SERVICE BULLETIN 84-32-55 GOODRICH SERVICE BULLETIN DASH 8 Q400 - MAIN LANDING GEAR - RETRACTION ACTUATOR ASSEMBLY - INTRODUCTION OF NEW CONFIGURATION REVISION NO. 1 - January 18, 2008 Service Bulletin 46550-32-57 Revision 1 supersedes Service Bulletin 46550-32-57 dated Nov 07/07 and is reissued in its entirety with the changes listed below. Please destroy all copies of SB 46550-32-57 dated Nov 07/07. Page/Para Change Page 1, Section I, Paras 2, 7 Information for concurrent requirements added and Page 2, Section II, Para 1 rod end assembly PN P3A2750-1 added. Page 3, Section III Material Information updated. HIGHLIGHTS 46550-32-57 R1 Jan 18/08 Page 1 of 1 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 6 of 10 ### Page 8 (OCR) SERVICE BULLETIN 84-32-55 GOODRICH SERVICE BULLETIN DASH 8 Q400 - MAIN LANDING GEAR - RETRACTION ACTUATOR ASSEMBLY - INTRODUCTION OF NEW CONFIGURATION SECTION I - PLANNING INFORMATION 1. EFFECTIVITY MLG Retraction Actuator Assemblies P/N 46550-9/-11 S/N MAL*0001 through MAL *0452 *Alpha character may vary, e.g. MAL, MA, MA- 2. CONCURRENT REQUIREMENTS Service Bulletin 46550-32-57 and Service Bulletin 46550-32-61 can be accomplished at the same time. 3. REASON A requirement exists for increased corrosion protection at the piston/rod end interface. 4. DESCRIPTION A new configuration retraction actuator assembly is introduced with a new piston manufactured from 15-5 PH stainless steel. 5. COMPLIANCE Goodrich Landing Gear (Menasco Aerospace), in concurrence with the aircraft manufacturer, recommends accomplishment of this service bulletin at operator's earliest convenience. 6. APPROVAL This bulletin contains no modification information that revises approved configurations, and therefore does not require governmental or other regulatory approval. 7. MANPOWER No additional man-hours are required to accomplish this Service Bulletin at next shop visit. Approximately 4.0 man-hours are required to disassemble, assemble and test the retraction actuator assembly. 8. MATERIAL COST AND AVAILABILITY All parts and associated seals required to accomplish this Service Bulletin are available from: Goodrich Landing Gear, Tele: 1-905-827-7777 1400 South Service Rd, Fax: 1-905-825-1583 Oakville, Ontario, Canada L6L 5Y7 Attention: Spares Department 46550-32-57 R1 Page 1 of 3 Jan 18/08 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 7 of 10 ### Page 9 (OCR) SERVICE BULLETIN 84-32-55 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. 9. TOOLING Refer to Component Maintenance Manual 32-31-06 for tooling required. No additional tooling is required to accomplish this service bulletin. 10. WEIGHT AND BALANCE N/A 11. ELECTRICAL LOAD DATA N/A 12. REFERENCES Goodrich Landing Gear Component Maintenance Manual 32-31-06 13. OTHER PUBLICATIONS AFFECTED N/A SECTION II - ACCOMPLISHMENT INSTRUCTIONS NOTE: Numbers in parenthesis refer to CMM 32-31-06, IPL Figure-Item Number. 1. Disassembly/Assembly Disassemble the retraction actuator assembly (Refer to CMM 32-31-06, DISASSEMBLY). NOTE: Discard rod end assembly PN P3A2750 (1-90) if damaged and replacement is required. B. Assemble the retraction actuator assembly with new piston PN 46570-5, rod end assembly PN P3A2750-1 as required, and test (Refer to CMM 32-31-06 ASSEMBLY and TESTING AND FAULT ISOLATION). NOTE: Rod end PN P3A2750 and rod end PN P3A2750-1 are interchangeable. Reidentification CAUTION: DO NOT LETTER STAMP NAMEPLATE ON CYLINDER ASSEMBLY. THIS CAN DAMAGE ASSEMBLY. A. Re-identify the retraction actuator assembly PN 46550-9/-11 as PN 46550-13 on nameplate (1-30). B. For retraction actuator assemblies with rod end PN P3A2750-1 installed, vibropeen SB 32-57 and date accomplished on nameplate (1-30). C. Record incorporation of Service Bulletin 32-57 in aircraft logbook. Jan 18/08 46550-32-57 R1 Page 2 of 3 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 8 of 10 ### Page 10 (OCR) SERVICE BULLETIN 84-32-55 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. SECTION III - MATERIAL INFORMATION New P/N Qty™ Keyword Old P/N Qty Disposition 46570-5 Piston 46570-3 1 Discard **P3A2750-1 Rod End Assy P3A2750 1 Discard ***7145MT-954-P4 1 Seal, Static 7145MT-954-P4 1 Discard Piston Head ***7332MT-954-P4 1 ***7220FT-954-P4 1 Seal, Dynamic Seal, Dynamic Rod 7332MT-954-P4 1 Discard 7220FT-954-P4 Discard Piston Head * Qty per landing gear ** Only required if current rod end assembly needs replacement *** If accomplishing SB 46550-32-57 and SB 46550-32-61 at the same time, only one set of seals are required. Jan 18/08 46550-32-57 R1 Page 3 of 3 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 9 of 10 ### Page 11 (OCR) SERVICE BULLETIN 84-32-55 This Page Intentionally Blank 14 Jan 2008 S.B. 84-32-55 Revision 'A' 10 Mar 2008 Page 10 of 10 ### Page 12 (OCR) BOMBARDIER SERVICE BULLETIN (SB) - RECORD OF INCORPORATION - Q SERIES DASH 8 AIRCRAFT To: Partner Data Co-Ordinator (Toronto) From: Bombardier Aerospace Regional Aircraft Company: Phone: (1) 416 375 3534 Phone: Extn: Facsimile: (1) 416 375 4538 Facsimile: Date: E-mail: partner.data.ra.techpubs@aero.bombardier.com 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 PDF to: partner.data.ra.techpubs@aero.bombardier.com Nov 2006 ### Page 13 (OCR) BOMBARDIER SERVICE BULLETIN (SB) COMMENT SHEET - Q SERIES DASH 8 AIRCRAFT To: SB Focal (Toronto) "Bob Barriault" From: - Bombardier Aerospace Regional Aircraft Company: Phone: (1) 416 375 4078 Phone: Extn: Facsimile: (1) 416 375 4538 Facsimile: Date: E-mail: bob.barriault@aero.bombardier.com 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 PDF to: bob.barriault@aero.bombardier.com Nov 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.