# Bombardier Service Bulletin 84-57-22 Copy: U.S. DOT/FAA - Service Bulletin ("U.S. DOT/FAA - Service Bulletin"), 17 pages: PDF https://openairdocs.org/files/sha256/80/62/8062096ee6055d4e1a88b79c5138f23ecd27a13a935c737afa9012933cc1e6c5; text https://openairdocs.org/service-documents/bombardier/sb-84-57-22/file/8062096ee605.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0298; AD 2012-12-16 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: 84-57-22 - Latest revision known: 84-57-22, Revision B, dated February 16, 2011 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/bombardier/sb-84-57-22 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2012-12-16](https://openairdocs.org/ad/2012-12-16.md), effective Jul 30, 2012: Revisions A and B Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-84-57-22/proposed.md). ## Text (17 pages) Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0298; AD 2012-12-16 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 84-57-22 Wings - Access Panels - Special Inspection and Rectification - Cracks In Outer Wing Fuel Access Panel #2 This page transmits Revision 'B' of Service Bulletin 84-57-22, pages 1 thru 14 dated 16 Feb 2011. This service bulletin is re- issued in its entirety for the reasons that follow: - the ACCOMPLISHMENT INSTRUCTIONS section is revised to show correct Figure number reference 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 84-57-22 Revision 'A' and replace with attached. Previous issue(s) of Service Bulletin 84-57-22: Initial issue - Pages 1 thru 14 dated 03 Dec 2010 Revision 'A' - Pages 1 thru 14 dated 09 Dec 2010 Revision 'B' 16 Feb 2011 ### Page 2 (OCR) de HAVILLAND BOMBARDIER DASH8 SERVICE BULLETIN Customer. Support ATA SYSTEM: 5721 NUMBER: 84-57-22 BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS SUBJECT: Wings - Access Panels - Special Inspection and Rectification - Cracks In Outer Wing Fuel Access Panel #2 1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4106. 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. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 1 of 14 JR ### Page 3 (OCR) SERVICE BULLETIN 84-57-22 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 85714231-001 Fuel Access Panel B. Reason Problem: An operator has reported a crack in an outer wing fuel access panel. Cause: There is a lack of a fillet radius in the inner seal groove due to improper machining. Pre-Mod panels were manufactured by Bombardier or Cyclone. Only non-conforming Cyclone panels need to be replaced. Solution: Visual inspections will be done for cracks on the second inboard fuel access panel (524BT and 624BT) of the outboard wing. The terminating action for this service bulletin will be replacement of the two panels with new access panels when access panels are identified as non- conforming Pre-Mod Cyclone manufactured panels. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - fuel access panel 524BT, (left wing) and 624BT, (right wing) are located - visual inspection for rivets is conducted, panels with rivets are declared Post-Mod - if panels are not identified as Post-Mod, then repeat visual inspections are required - a visual inspection is done on the panels for cracks. If cracks are found new access panels are installed before the next flight - if no cracks are found, repeat DVI (Detailed Visual Inspections) for cracking are required until terminating action is completed or - remove panel to identify if Cyclone manufactured it, if panel is Pre-Mod and manufactured by Cyclone and non-conforming the panel is replaced - the terminating action of this service bulletin is the installation of two Bombardier manufactured Pre-Mod, known conforming Cyclone pre-mod or post-mod access panels at the two locations. The service bulletin is signed-off as being completed after this is done. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 2 of 14 JR ### Page 4 (OCR) SERVICE BULLETIN 84-57-22 D. Compliance Bombardier Inc. highly recommend that this service bulletin be incorporated 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). F. Manpower Visual Inspection for Cracks It will take an estimated 0.75 man-hour to complete the visual inspection on one access panel. The breakdown of man-hours is shown in the table that follows: TASK MAN-HOURS Job Set- Up 0.25 Procedure 0.25 Close-Out 0.25 Final Terminating Action - Removal/Replacement of Fuel Access Panel It will take an estimated 3.0 man-hours to remove/replace one fuel access panel. The breakdown of man -hours is shown in the table that follows: TASK MAN- HOURS Job Set - Up 0.25 Removal of One Panel 1.00 Installation of One Panel 1.50 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 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 3 of 14 JR ### Page 5 (OCR) SERVICE BULLETIN 84-57-22 G. Material - Price and Availability The parts detailed in Paragraph 2.A. may be obtained from any Bombardier Aerospace Regional Aircraft authorized parts source. The price and availability will be quoted at the time of order. 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 ModSums Manual ..... ... PSM 1-84-12 References Revision 'B' of this service bulletin was prepared to the engineering drawings and related data that follows: PCA 43102 Revision 1 (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 Per Aircraft 2 85714231-003 Fuel Access Panel B. Parts Required to Modify Spares None 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 4 of 14 JR ### Page 6 (OCR) SERVICE BULLETIN 84-57-22 C. Special Tools and Equipment Required None 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 85714231-001 Access Panel 2 C DIS 85714231-003 IC 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. 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. S 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 (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 thru each main gear and main gear door mechanism. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 5 of 14 JR ### Page 7 (OCR) SERVICE BULLETIN 84-57-22 (3) Make sure the nose gear ground lock is engaged. (4) Set up work platforms or ladders to permit access to the top of the wing-left hand and right hand side. Make sure the platforms or ladders are electrically grounded. (5) Refer to Figure 1 and Figure 2 and locate fuel access panel 524BT (left wing) and 624BT (right wing). B. Procedure NOTE: Identification plates have been installed on the underside of access panels using rivets via modsum 4-113502. These "post-mod" panels are known to be conforming to blueprint condition. For panels that are "pre-mod", the manufacturer has identified detail job numbers (defined in Table 1) of panels that are considered to be non-conforming to blueprint condition. I. Inspection Perform external inspection of outer wing access panels and locate the rivets of the identification plate. Exact location of identification plate is referenced in Figures 3 & 4: (1) If rivets of identification plate shown in Figures 3 & 4 are found, the panel is considered to be post-mod 4-113502 and therefore no further action is required for this panel per this service bulletin. (2) If rivets of identification plate shown in Figures 3 & 4 cannot be found, the panel is considered to be pre-mod 4-113502. One of the following two options must be performed: Option 1: (a) Remove panels per TASK 57-21-01-000-801 (P/N 85714231-001) and verify if identification plate is installed. (b) If identification plate found, re-install panel per TASK 57-21-01-400-801. No further action is required per this service bulletin. Refer to section C. Close-out. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 6 of 14 JR ### Page 8 (OCR) SERVICE BULLETIN 84-57-22 (c) If no identification plate is found, inspect the job detail number stamped on the underside of the panels. Refer to Figure 5 for location of job detail number. If the job detail number matches any of those identified in Table 1, the panels are defective and must be replaced; refer to section II "Rectification" below. If the job detail number does not match any of those identitied in lable 1, re-install panel per TASK 57-21-01-400-801, no further action is required per this service bulletin. Refer to section C. Close out. Option 2: (a) Perform external Detailed Visual Inspections (DVI) on panels 524BT and 624BT to determine if cracks exist. (b) If no cracks are found repeat inspection every 600 flight hours. (c) If any access panel is found cracked, refer to section II "Rectification" below. Within 6,000 flight hours, remove panels 524BT and 624BT on the left hand and right hand outer wings per TASK 57-21-01-000-801 (P/N 85714231-001) and verify if identification plate is installed. If identification plate found, re-install panels per TASK 57-21-01-400-801, and no further action is required. Refer to section C. Close out. If no identification plate is found, inspect the job detail number stamped on the underside of the panels. (Refer to Figure 5 for location of job detail number). If the job number matches any of those identified in Table 1, refer to section Il "Rectification" below. If the job detail number does not match any of those identified in Table 1 re-install panels per TASK 57-21-01-400-801 and refer to section C. Close Out. II. Rectification Replacement of the left hand and right hand outer wing access panels (524BT and 624BT) identified in Table 1 constitutes the final terminating action for this service bulletin. After completion of the steps that follow, the service bulletin can be signed- off as being completed. (1) Refer to TASK 57-21-01-000-801 to remove and discard existing access panels 524BT and 624BT (part number 85714231-001) where applicable. (2) Refer to TASK 57-21-01-400-801 to install new access panels 524BT and 624BT (part number 85714231-003) where applicable. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 7 of 14 JR ### Page 9 (OCR) SERVICE BULLETIN 84-57-22 TABLE 1: (see Figure 5 for location) Part Number Affected Panels Job Detail Numbers 11829-A-1 85714231-001 524BT, 624BT 7070-A-1 C. Close Out (1) Remove all tools and equipment from the work area. (2) On completion of this service bulletin (replacement of the left hand and right hand outer wing access panels), make the following entry in the appropriate logbooks: Service Bulletin 84-57-22 {Wings - Access Panels - Special Inspection and Rectification - Cracks In Outer Wing Fuel Access Panel #2) accomplished". Enter this entry only after complete incorporation of all work defined in this service bulletin. If only part of this service bulletin is completed, use only this service bulletin number as reference and detail exact limit of work completed. 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 8 of 14 JR ### Page 10 (OCR) SERVICE BULLETIN 84-57-22 -155.200 Y₩ -191.200 524BT Yw -425.019 NOTE: The metal-to-metal interface and the access panel inner and outer ring seals (gaskets) is a fuel tank safety critical items. They are classified as a Critical Design Configuration Control Limitation (CDCCL) items. Their integrity must be maintained to make sure that unsafe maintenance, conditions do not develop by modification or repair. The mating surfaces between the fuel tank access panel and the wing skin must not be primed or painted. Only chemical conversion coating is permitted and no other finishes are permitted. Location of Fuel Access Panel 524BT on Left Hand Wing Figure 1 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 9 of 14 JR ### Page 11 (OCR) SERVICE BULLETIN 84-57-22 425.019 NOTE: The metal-to-metal interface and the access panel inner and outer ring seals (gaskets) is a fuel tank safety critical items. They are classified as a Critical Design Configuration Control Limitation (CDCCL) items. Their integrity must be maintained to make sure that unsafe do not develop by maintenance, The mating surfaces between the fuel tank access panel and the wing skin must not be primed or painted. Only chemical conversion coating is permitted and no conditions modification or repair. other finishes are permitted. 624BT 191.200 Location of Fuel Access Panel 624BT on Right Hand Wing Figure 2 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 10 of 14 JR ### Page 12 (OCR) SERVICE BULLETIN 84-57-22 Identification Plate Location of Identification Plate Figure 3 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 11 of 14 JR ### Page 13 (OCR) SERVICE BULLETIN 84-57-22 Identification Plate Rivets Identification of Plate Rivets Figure 4 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 12 of 14 JR ### Page 14 (OCR) B 571 221-103 7070--A- 1 Job Number 8507-55062 85718231-001 1070 - 4 Job Detail Number Location Figure 5 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 13 of 14 JR ### Page 15 (OCR) SERVICE BULLETIN 84-57-22 This Page Intentionally Blank 03 Dec 2010 S.B. 84-57-22 Revision 'B' 16 Feb 2011 Page 14 of 14 JR ### Page 16 (OCR) BOMBARDIER SERVICE BULLETIN (SB) - RECORD OF INCORPORATION - Q SERIES DASH 8 AIRCRAFT 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 17 (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 200g --- 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.