# Bombardier Service Bulletin 84-32-60 Copy: Revision A ("U.S. DOT/FAA - Service Bulletin 84-32-60--RA"), 15 pages: PDF https://openairdocs.org/files/sha256/06/0f/060f17f74855c0a334c5dd9de3d7204c43c9373c3913d45447ac842d31e02a78; text https://openairdocs.org/service-documents/bombardier/sb-84-32-60/file/060f17f74855.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: 84-32-60 - Latest revision known: 84-32-60, Revision A, dated September 29, 2008 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/bombardier/sb-84-32-60 ## 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 ## Text (15 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 84-32-60 Landing Gear - Main Landing Gear (MLG) - Retraction Actuator Assembly - Introduction of New Configuration 46550-15 - ModSum 4-901610 This page transmits Revision 'A' of Service Bulletin 84-32-60, pages 1 thru 12 dated 29 Sep 2008. This service bulletin is re-issued in its entirety for the reasons that follow: - the table in the Spares Affected section is revised with the correct part numbers - the References section is revised to convey the latest revision of the service bulletin and engineering documentation The Compliance in the previous issue(s) of this service bulletin is not affected by this revision. No additional rework to the aircraft is introduced by this revision. Remove Service Bulletin 84-32-60 Initial Issue dated 13 Jun 2008 and replace with attached. Previous issue(s) of Service Bulletin 84-32-60: Initial issue - Pages 1 thru 12 dated 13 Jun 2008 Revision 'A' 29 Sep 2008 ### Page 2 (OCR) de HAVILLAND BOMBARDIER DASH8 SERVICE BULLETIN Customer_ Support ATA SYSTEM: 3231 NUMBER: 84-32-60 BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS SUBJECT: Landing Gear - Main Landing Gear (MLG) - Retraction Actuator Assembly - Introduction of New Configuration 46550-15 - ModSum 4-901610 1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4192. Production: ModSum 4-901610 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4193 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. 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 1 of 12 MG ### Page 3 (OCR) SERVICE BULLETIN 84-32-60 Spares Affected: The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition. Part Number Description 46550-9 46550-11 MLG Retraction Actuator Assembly 46550-13 B. Reason Problem: Two MLG retraction actuators have failed in service. Cause: The failures are attributed to corrosion at the cylinder/gland nut and at the piston/rod end/jam nut interfaces. Solution: Introduce a new configuration MLG retraction actuator assembly (46550-15) with an improved cylinder assembly (46551-3). This will introduce serialization to the life limited rod end under part number P3A2750-1. The new cylinder with have electroless nickel plating on the threads and adjacent thread relief areas of the cylinder replacing the cadmium plating that was used as corrosion protection on the 46551 - 1 cylinder assembly and rod end. The new configuration actuator (- 15) will also incorporate stainless steel locking hardware in the form of NAS1193K14C lockwashers and NAS1423C14 jam nut replacing the CAD plated stainless steel NAS1193K14CP lockwashers and CAD plated 4130 steel NAS1423-14 jam nut. The new configuration actuator (- 15) will carry over the CIC and sealant application introduced in the 46550-11 configuration. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - the aircraft is put on jacks with the gear pinned. Hydraulic pressure is depleted - both main gear retraction actuators are removed and disassembled or replaced with a new actuator of the latest configuration 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 2 of 12 MG ### Page 4 (OCR) SERVICE BULLETIN 84-32-60 - the actuators are re-assembled per the attached Goodrich SB with a new cylinder, jam nut and, if not previously incorporated, a new piston and rod end assembly - the actuators are then re-installed to the left and right main landing gear - the hydraulic system is bled and a function test of the landing gear is done - tools are cleared and log entries are made. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4-901610 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. 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 All costs to incorporate this modification are the responsibility of the Operator NOTE: Some manhours will be saved if this service bulletin is done concurrently with Service Bulletin 84-32-57 and Service Bulletin 84-32-61. G. Material - Price and Availability Refer to enclosed Goodrich Service Bulletin 46550-32-61. 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 3 of 12 MG ### Page 5 (OCR) SERVICE BULLETIN 84-32-60 H. Tooling - Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue ......... .......... PSM 1-84-4 Component Maintenance Manual .. PSM 1-84-6 ModSums Manual ....... PSM 1-84-12 L. References Revision 'A' of this service bulletin was prepared to the engineering drawings and related data that follows: ModSum 4Q901610 Rev. 'A' ModSum 4-901610 Rev. 'A' PCA 42199 Rev 1 (for internal reference only) Goodrich Service Bulletin 46550-32-61 dated Dec 21/07 Service Bulletin 84-32-55, Landing Gear - Main Landing Gear - Retraction Actuator Assembly- Introduction of New Configuration - ModSum 4-901603 (Goodrich Service Bulletin 46550-32-57 R1). 2. MATERIAL INFORMATION A. Parts Required Per Aircraft Refer to enclosed Goodrich Service Bulletin 46550-32-61. NOTE: This service bulletin is self-contained illustrated). No drawings will be supplied. B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 4 of 12 MG ### Page 6 (OCR) SERVICE BULLETIN 84-32-60 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 46550-9 46550-11 MLG Retraction Actuator 2 IRWK 46550-15 R 46550-13 IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition Discard Part. MUl 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. R Part number after rework. Superseding or equivalent part number. Reworked part and superseding part are functionally and physically equivalent but not identical. 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. 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 5 of 12 MG ### Page 7 (OCR) SERVICE BULLETIN 84-32-60 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. Pump brake pedals to deplete all hydraulic pressure. (2) Refer to TASK 07-10-00-582-801 and put the aircraft on jacks. B. Procedure (1) Refer to TASK 32-31-11-000-801 and remove retraction actuator 46550-9, 46550-11 or 46550-13 from the left and right main landing gear. (2) Refer to enclosed Goodrich Service Bulletin 46550-32-61 and modify / test the removed actuators or send the actuators to an approved shop for overhaul / modification. (3) Refer to TASK 32-31-11-400-801 and install a new or modified actuator 46550-15 to the left and right main gear. (4) Refer to TASK 32-00-00-840-802, remove the door locks and close the main landing gear doors. C. Close Out (1) Refer to TASK 29-10-00-870-802 and bleed and replenish No 2 Hydraulic System. (2) Refer to TASK 32-31-00-710-801 and do an operational test of the landing gear primary extension and retraction system. (3) Remove all jacks from the aircraft. (4) Remove all tools and equipment from the work area. (5) On incorporation of this ModSum, make an entry that conforms to local regulatory requirements in the applicable logbook(s). Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin. 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 6 of 12 MG ### Page 8 (OCR) SERVICE BULLETIN 84-32-60 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 PN 46550-13 SN MAL*0001 through MAL *0469 *Alpha character may vary, e.g. MAL, MA, MA- 2. CONCURRENT REQUIREMENTS Service Bulletin 46550-32-57 introduced Retraction Actuator Assembly PN 46550-13 with piston PN 46570-5 manufactured from 15-5 PH CRES. Service Bulletin 46550-32-57 and Service Bulletin 46550-32-61 can be accomplished at the same time. REASON A requirement exists for increased corrosion protection at cylinder assembly/gland nut and piston/rod end/jam nut interface 4. DESCRIPTION MLG Retraction Actuator Assembly PN 46550-15 is introduced with cylinder assembly PN 46551-3 and jam nut NAS1423C14. 5. COMPLIANCE Goodrich Landing Gear 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 Approximately 0.5 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. 46550-32-61 Dec 21/07 Page 1 of 5 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 7 of 12 MG ### Page 9 (OCR) SERVICE BULLETIN 84-32-60 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. 8. MATERIAL COST AND AVAILABILITY Cylinder assembly, jam nut and the associated seals 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 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 NA 11. ELECTRICAL LOAD DATA NA 12. REFERENCES Goodrich Landing Gear Component Maintenance Manual 32-31-06 13. OTHER PUBLICATIONS AFFECTED NA SECTION II - ACCOMPLISHMENT INSTRUCTIONS. NOTE: Numbers in parenthesis refer to CMM 32-31-06, IPL Figure-Item Number. Disassembly A. Disassemble the retraction actuator assembly (Refer to CMM 32-31-06, DISASSEMBLY). B. Remove restrictor fittings (50) and (70) from cylinder assembly (270). Remove clamp (10) and insert (20) from cylinder assembly (270). Discard packings (60) and (80). NOTE: Discard rod end assembly P3A2750 if damaged and replace as required. C. Remove nameplate (30) from cylinder assembly (270). D. Rework cylinder PN 46551-1 (Ref. CMM 32-31-06, REPAIR Para. 5F). NOTE: Reidentify reworked cylinder as PN 46551-3 (Ref. Fig 1). NOTE: Cylinder PN 46551-1 can be returned to Goodrich for rework (Ref. Section I, Para 8). Dec 21/07 46550-32-61 Page 2 of 5 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 8 of 12 MG ### Page 10 (OCR) SERVICE BULLETIN 84-32-60 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. 2. Assembly A. Lubricate new packings (60) and (80) and restrictor fitting (50) and (70) threads with Skydrol. Install packing (60) on restrictor fitting (50). Install packing (80) on restrictor fitting (70). NOTE: Do not use packings NAS1611-014A or NAS1611-016A. B. Apply corrosion inhibiting compound, Mastinox 6856K, to cylinder at serrated. areas as shown (Ref. Fig. 1, Detail A). NOTE: Do not allow Mastinox to contact hydraulic ports or seal chamfer area. C. Torque restrictor fitting (50) to 620 to 700 Ibf in. Torque restrictor fitting (70) to 270 to 375 Ibf in. NOTE: Remove any excess Mastinox around restrictor fittings using a lint free cloth. D. Assemble the retraction actuator assembly with new cylinder assembly PN 46551- 3, new jam nut NAS1423C14, rod end assembly and test (Refer to CMM 32-31-06 ASSEMBLY and TESTING AND FAULT ISOLATION). NOTE: Replacement rod end assembly, if required, will be serialized and identified as PN P3A2750-1. E. Install nameplate (30) on cylinder PN 46551-3 (Refer to CMM 32-31-06 REPAIR). 3. Test A. Test the retraction actuator assembly (Refer to CMM 32-31-06, TESTING and FAULT ISOLATION). 4. Reidentification CAUTION: DO NOT LETTER STAMP NAMEPLATE ON CYLINDER ASSEMBLY. THIS CAN DAMAGE ASSEMBLY. A. Re-identify the retraction actuator assembly PN 46550-13 as PN 46550-15 on nameplate (30). B. For retraction actuator assemblies with unserialized rod end PN P3A2750 installed, vibropeen SB 32-61 and date accomplished on nameplate (1-30). C. Record incorporation of Service Bulletin 32-61 in aircraft logbook. 46550-32-61 Page 3 of 5 Dec 21/07 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 9 of 12 MG ### Page 11 (OCR) SERVICE BULLETIN 84-32-60 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. SECTION III - MATERIAL INFORMATION New PNQty* Keyword Old PN Qty Disposition 46551-3 1 Cylinder Assy 4655,1-1 Rework/Return to Goodrich **7145MT-954-P4 1 Seal, Static 7145MT-954-P4 1 Discard Piston Head **7220FT-954-P4 1 Seal, Dynamic Rod 7220FT-954-P4 1 Discard **7332MT-954-P4 1 Seal, Dynamic 7332MT-954-P4 Discard Piston Head ***NAS1193K14C 1 Jam Nut NAS1193K14CP 1 Discard NAS1423C14 1 Jam Nut NAS1423-14 1 Discard NAS1611-014 1 Packing NAS1611-014 1 Discard OR 2-014E515-80 NAS1611-016 1 Packing NAS1611-016 1 Discard OR 2-016E515-80 ***P3A2750-1 1 Rod End Assy P3A2750 1 Discard OR P3A2750-1 *Qty per landing gear ** If accomplishing SB 46550-32-57 and SB 46550-32-61 at the same time, only one set of seals are required. ***If required 46550-32-61 Page 4 of 5 Dec 21/07 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 10 of 12 MG ### Page 12 (OCR) SERVICE BULLETIN 84-32-60 Goodrich Landing Gear Division Goodrich Aerospace Canada Ltd. CYLINDER ASSEMBLY RESTRICTOR 46551-3 (REF) PACKING (REF) PACKING RESTRICTOR (REF) PISTON (REF) 46570-5 NUT NAS1423C14 LOCKING DEVICE NAS1193K14C OR NAS1193K14CP (130A) ROD END ASSEMBLY P3A2750-1 OR P3A2750 DETAIL A TYPICAL (2 PLACES ROTATED 90°) NOTE 1 APPLY MASTINOX IN THIS LOCATION. 2 REIDENTIFY CYLINDER PN 46551-1 AT THIS LOCATION BY RUBBER STAMP. SB46550-32-61 Retraction Actuator Assembly - Rework Figure 1 Dec 21/07 46550-32-61 Page 5 of 5 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 11 of 12 MG ### Page 13 (OCR) SERVICE BULLETIN 84-32-60 This Page Intentionally Blank 13 Jun 2008 S.B. 84-32-60 Revision 'A' 29 Sep 2008 Page 12 of 12 MG ### Page 14 (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 2008 ### Page 15 (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: _ Exin: _ 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 New 2006 --- 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.