# D

S.B. 84-28-13 Page 1 of 10 17 Aug 2012 MG 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2812 NUMBER: 84-28-13 

### BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Fuel System - Center Wing - Removal of Clamps Between Engine Feed and Scavenge System Lines on RHS - ModSum 4-113745

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4332 thru 4417. NOTE: Serial Numbers 4001 thru 4331 are covered by Bombardier Service Bulletin 84-28-09 (ModSum 4-113643).
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

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 2 of 10 17 Aug 2012 MG B. Reason Problem: The existing clamp installation in the right hand side center wing fuel tank (between the engine fuel feed line and the scavenge system line) is now redundant after the engine fuel feed line revision that increased the space between the two lines. Solution: Remove and discard the existing clamp installation located between the engine fuel feed line and the scavenge system line. 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 - the nose landing gear lock is engaged - the main landing gear lock pins are installed thru each main gear and main gear door mechanism - the fuel tanks are drained, aircraft electrical power is removed and the engines are supported - access is gained to fuel tank access panel 622CT-right hand side - access panel 622CT is removed, residual fuel is mopped up and the tank is vented - the affected clamps and hardware are removed and discarded - access panel 622CT-right hand side is installed - close out. D. Compliance Bombardier Inc. highly recommend that ModSum 4-113745 be incorporated at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. A Transport Canada Airworthiness Directive Pending. 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.

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 3 of 10 17 Aug 2012 MG This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). F. Manpower It will take an estimated 2.50 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 0.50 Test / RTS not applicable Close-Out 1.00 * time required to defuel and vent fuel tank not included 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 part(s) and material(s) detailed in Paragraph(s) 2.A. may be purchased as single items from Bombardier Aerospace Regional Aircraft. 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 I. Weight and Balance None J. Electrical Load Data Not affected

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 4 of 10 17 Aug 2012 MG K. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1-84-4

.................... ModSums Manual PSM 1-84-12

.................................. L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV

8DK4195 1
- ModSum 4Q113745 Rev. ‘B’ ModSum 4-113745 Rev. ‘B’ Bombardier Service Bulletin 84-28-09 Rev. ‘C’ (ModSum 4-113643) Bombardier Service Bulletin 84-28-14 (ModSum 4-113754) Bombardier Service Bulletin 84-28-15 (ModSum 4-113762) PCA 44006 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive Pending.
2. MATERIALINFORMATION A. Parts Required Per Aircraft (1) Drawing Kit 8DK4195-001, Rework - Fuel System Installation, Center Wing (2) Detailed Kit Content:

Quantity Per Kit -001 Part Number Description Remarks
1 -001 Rework drawing

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 5 of 10 17 Aug 2012 MG 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: MAKE SURE YOU 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: MAKE SURE YOU 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.
WARNING: OBEY ALL THE FUEL SAFETY PRECAUTIONS WHEN YOU DO WORK ON THE FUEL SYSTEM AND/OR A FUEL SYSTEM COMPONENT. IF YOU DO NOT YOU CAN CAUSE INJURIES TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (1) Make sure that lock pins are installed through each main gear and main gear door mechanism. (2) Make sure the nose gear ground lock is engaged. WARNING: YOU MUST REMOVE THE FUEL FROM THE FUEL TANK IN AN OPEN AREA. IF YOU DO NOT DO THIS, YOU CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 6 of 10 17 Aug 2012 MG (3) Refer to AMM TASK 28-10-00-840-801 and prepare fuel tank for access. Make sure no fuel or fuel vapors are present before working on aircraft or in the fuel tanks. (4) Refer to AMM TASK’ 24-00-00-861-802, TASK 24-00-00-910-801 and placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS
. (5) Refer to Figure 1 and set up work platforms and/or ladders to permit access to the fuel tank access panel 622CT right hand side. Make sure that the work platforms or ladders are electrically grounded. (6) Refer to AMM TASK 28-00-00-910-801 and make sure to obey the fuel system safety precautions. (7) Refer to AMM TASK 24-00-00-910-801 and make sure to obey the electrical/electronic safety precautions. (8) Refer to AMM TASK 24-00-00-910-802 and obey the electrostatic discharge safety precautions. CAUTION: MAKE SURE THAT THE FUEL TANKS ARE DRAINED BEFORE YOU REMOVE THE ACCESS PANELS. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE TO THE WING STRUCTURE.
CAUTION: MAKE SURE THAT YOU DO NOT MOVE THE AIRCRAFT BEFORE YOU INSTALL THE FUEL ACCESS PANELS. THIS IS NECESSARY TO PREVENT DAMAGE TO THE WING AND THE WING BOX STRUCTURE. (9) Refer to Figure 1 and the applicable instructions in AMM TASK 57-11-01-000-801 and remove right wing access panel 622CT. (10) Use cotton cloths or a natural sponge to soak up the remaining fuel. (11) Refer to the applicable instructions in AMM TASK 28-10-00-840-802 and remove fuel fumes from tank. CAUTION: KEEP A CONTINUOUS FLOW OF VENTILATING AIR THROUGH A FUEL TANK WHEN WORK IS BEING DONE INSIDE THE TANK.
B. Procedure (1) Refer to Figure 2 and locate existing clamp installation between Y136.300 and Y157.825.

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 7 of 10 17 Aug 2012 MG (2) Remove and discard screw NAS1801-3-16, spacer NAS43DD3-32FC, clamp MS21919WDF12, clamp MS21919WDF16, washer AN960D10L and self locking nut MS21042L3. C. Close Out (1) Make sure to remove all debris and unwanted material(s) from the fuel tanks. (2) Refer to AMM TASK 57-11-01-400-801 and install right wing access panel 622CT. (3) Remove all tools and equipment from the work area. (4) 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.

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 8 of 10 17 Aug 2012 MG Plan View Figure 1

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 9 of 10 17 Aug 2012 MG Detail A Figure 2 REMOVED AND DISCARDED: SCREW NAS1801-3-16 SPACER NAS43DD3-32FC CLAMP MS21919WDF12 CLAMP MS21919WDF16 WASHER AN960D10L NUT, SELF LOCKING MS21042L3

ENGINE FEED INSTALLATION 82822002

SCAVENGE MOTIVEFLOW INSTALLATION 82822012

### SERVICE BULLETIN 84-28-13

S.B. 84-28-13 Page 10 of 10 17 Aug 2012 MG 

### This Page Intentionally Blank 1Jan 2009 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.comFeb 2009 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 box(es) 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 V Effectivity V Reason V Description V Compliance VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling V References V Publications Affected 2. MATERIAL INFORMATION V Kit Content V Special Tools/Equipment V Parts to Modify Spares V Consumables V Disposition of Existing Parts V Other
3. ACCOMPLISHMENT INSTRUCTIONS V Job Set ---Up V Procedure V Close---Out VTest V Illustration(s) V Other 4. COMMENTS, REMARKS, SUGGESTIONS



## Fax this sheet to (1) 416 375 4538 or Email PDF to: syed.rizvi@aero.bombardier.com