Revision ‘A’ 25 Jan 2012 DHC-8 (DASH 8) SERVICE BULLETIN 84-26-11
Fire Protection - Aft Nacelle Bracket Modification to Prevent Fire Detection Wire Chafing - ModSum 4-113717 This page transmits Revision ‘A’ of Service Bulletin 84-26-11, pages 1 thru 16, dated: 25 Jan 2012. This service bulletin is re-issued in its entirety for the reasons that follow:

- the Material - Price and Availabilitysection is revised to show correct kit number

- the References section is revised to convey the latest revision of the service bulletin and engineering documentation

- the MATERIAL INFORMATION section is revised to show correct kit number 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 previous issue of Service Bulletin 84-26-11 and replace with attached. Previous issues of Service Bulletin 84-26-11: Initial issue - Pages 1 thru 16 dated 19 Dec 2011

# D

S.B. 84-26-11

Page 1 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2611 NUMBER: 84-26-11

SUBJECT: Fire Protection - Aft Nacelle Bracket Modification to Prevent Fire Detection Wire Chafing - ModSum 4-113717

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4382. Production: ModSum 4-113717 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4383 thru 4429. Production: Equivalent Production ModSum 4-170047 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4430 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

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 2 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR B. Reason Problem: It has been discovered that chafing between the main landing gear yoke assembly and the fire detection wire can occur. Solution: This service bulletin provides instructions to install a new bracket and secure the fire detection wire in the aft nacelle. 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 - aircraft electrical power is removed - the nose landing gear lock is engaged - the main landing gear lock pins are installed thru each main gear and main gear door mechanism - safety stands are placed around the main landing gear - main landing gear (MLG) yoke and the fire detection wires are inspected for chafing and damages - existing bracket supporting fire detection wire is removed - new brackets are installed - close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4-113717 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 (DTIs).

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 3 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR F. Manpower It will take an estimated 3.00 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 0.25 Procedure 2.00 Test / RTS 0.50 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 G. Material - Price and Availability ModKit 8MK4581-003 is available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order specifying aircraft serial number(s) to: Bombardier Aerospace Customer Accounts Services Team (Mail Stop N11-32) 123 Garratt Blvd. Toronto Ontario Canada M3K-1Y5 Facsimile: (416) 375-3060 Telephone: (416) 375-3920
Kit Number Description 8MK4581-003 Mod Kit, Nacelle-Structures Provisions-Fire Detection Sys

H. Tooling - Price and Availability None

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 4 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR 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

.................................. L. References Revision ‘A’ of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4581 1 A

8Z9351 1 C ModSum 4Q113717 Rev. ‘H’ ModSum 4-113717 Rev. ‘H’ Service Letter DH8-400-SL-32-030 PCA 43636 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive pending 2. MATERIAL INFORMATION A. Parts Required Per Aircraft (1) Modification Kit 8MK4581-003 (2) Detailed Kit Content:

Quantity Per Kit -003 Part Number Description Remarks

12 B0205016AD4-3S Rivet 2 82624229-104 Bracket 4 B0205016AD4-4S Rivet 4 208236 Clamp, Hinged 4 324351 Grommet 2 82624229-103 Bracket

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 5 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR 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 (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. (3) Make sure the nose gear ground lock is engaged. (4) Set up the work platforms or ladders as required to gain access to the LH & RH nacelle inboard and outboard panels. Make sure the work platforms or ladders are electrically grounded. B. Procedure (1) Do a detailed visual inspection of the fire detector wire. If there is any damage noted on detector wire at location shown in Figure 7, discard the detector and replace with new detector. (2) Do a detailed visual inspection of the MLG yoke in the location shown in Figure 7. If chafing on MLG yoke with limitation as shown in Figure 8 is found, do the necessary repair per Figure 9. If limitation of chafing as shown in Figure 8 Section A-A is exceeded, contact Q Series Help Desk (thd.qseries@aero.bombardier.com) for further instructions. (3) Carefully remove fire detection wire from existing bracket supporting the fire detection wire on the LH and RH outboard and inboard nacelle panels. Refer to Figures 1, 2 & 4. (4) On the LH nacelle outboard panel and RH nacelle inboard panel, locate bracket 82624211 as shown in Figure 3, remove two existing rivets and install bracket 82624229-103 to same hole location using rivets B0205016AD4-4S.

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 6 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR (5) On the LH nacelle inboard panel and RH nacelle outboard panel, install bracket 82624229-104 using rivets B0205016AD4-3S as per dimensions shown in Figure 5. (6) Install new hinged clamp 208236 to new brackets 82624229-103 & 82624229-104 using rivets B0205016AD4-3S. Refer to Figures 3 & 5. (7) Install new grommet 324351 to fire detection wire. Refer to Figure 3 & 5. (8) Carefully install fire detection wire to new bracket assembly. Refer to Figure 3 & 5. NOTE: Make sure fire detection wire routing maintains a minimum bend radius of R1.00 inches. (9) Do an operational test of the nacelle fire detection system. Refer to Maintenance Manual Task 26-11-00-710-801. (10) Do an operational test of the landing gear primary extension and retraction system to make sure clearance is maintained between the gear and detection wire. Refer to Maintenance Manual Task 32-31-00-710-801. C. Close Out (1) Remove all tools and equipment from the work area. (2) 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 84-26-11

S.B. 84-26-11 Page 7 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Work Location Figure 1 FIRE DETECTION SYSTEM LH NACELLE FIRE DETECTION SYSTEM RH NACELLE

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 8 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Nacelle Panel Figure 2

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 9 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Nacelle Panel Figure 3 RIVET B0205016AD4-3S RIVET B0205016AD4-4S

GROMMET 324351 BRACKET 82624229-103

CLAMP, HINGED 208236

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 10 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Nacelle Panel Figure 4

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 11 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Nacelle Panel Figure 5 ALL DIMENSIONS ARE GIVEN IN INCHES RIVET B0205016AD4-3S RIVET B0205016AD4-3S

GROMMET 324351 BRACKET 82624229-104

CLAMP, HINGED 208236 0.490 0.620

0.620 1.26

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 12 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Nacelle Panel Figure 6 CLAMP, HINGED 208236 GROMMET 324351

BRACKET 82624229-103

ALL DIMENSIONS ARE GIVEN IN INCHES

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 13 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JRNacelle Fire Detection Wire Contact Locations on MLG YokeFigure 7FIRE DETECTION WIREINSPECTION AREAFIRE DETECTION WIREINSPECTION AREAYOKEINSPECTION AREAYOKEINSPECTION AREAView looking aft within nacelle with MLG extended

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 14 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Typical four locations, inboard/outboard yoke legs, port and starboard nacelles

Figure 8 1

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 15 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR Figure 9

### SERVICE BULLETIN 84-26-11

S.B. 84-26-11 Page 16 of 16 19 Dec 2011 Revision ‘A’ 25 Jan 2012 JR 

### This Page Intentionally Blank 2Jan 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 V Approval V Manpower V Material V Weight and Balance V Electrical Load V Tooling 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 V Test 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