Revision ‘A’ 11 Apr 2014 DHC-8 (DASH 8) SERVICE BULLETIN 8-24-92 Electrical Power - DC System - Starter/Generator Firewall Terminal Block Special Inspection and Rectification for Missing Insulating Sleeves This page transmits Revision ‘A’ of Service Bulletin 8-24-92, pages 1 thru 14, dated 11 Apr 2014. This service bulletin is re-issued in its entirety for the reasons that follow: - the Effectivitysection is revised to change “...with Mod 8/1926/Service Bulletin 8-24-45 installed.” to “...with terminal blocks P/N 82450075-001 installed.” - theCompliancesection is revised to include reference to TC AD CF-2014-03 - the Referencessection is revised to convey the latest revision of the service bulletin and to add reference to TC AD CF-2014-03 - the Proceduresection steps (3) and (4) are revised to reflect references to Figure 1 Sheet 1 and Sheet 2

- Figure 1 is revised for clarity, now consists of two sheets. Remove the initial issue of Service Bulletin 8-24-92 and replace with attached. Previous issue of Service Bulletin 8-24-92: Initial issue - Pages 1 thru 12 dated 25 Sep 2013.

# D

S.B. 8-24-92 Page 1 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 

# SERVICE BULLETIN Customer Support ATA SYSTEM: 2460 NUMBER: 8-24-92 

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

SUBJECT: Electrical Power - DC System - Starter/Generator Firewall Terminal Block Special Inspection and Rectification for Missing Insulating Sleeves
1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 102, 103, 106, 201, 202, 301, 311, 314 and 315 Serial Numbers 003 thru 672 with terminal blocks P/N 82450075-001 installed. 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 8-24-92

S.B. 8-24-92 Page 2 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 B. Reason Problem: Investigation after an unsuccessful attempt to start an engine on ground revealed heat damage on the nacelle firewall P/N 84510222. The damage was caused by arcing at the forward side of the terminal block P/N 82450075-001. Cause: The terminal block did not have insulating sleeves installed causing the terminal block to come in contact with the firewall. This condition could result in loss of DC generator or inability to start the engine. It can also be an ignition source due to arcing with the firewall. Solution: This service bulletin is issued to provide the instructions to inspect the nacelle firewall and the terminal block and its bushings for damage. It also provides the instructions to inspect the insulating sleeves to make sure they are installed and have no damage. Missing or damaged components are replaced or repaired. 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 - nose landing gear lock is engaged - main landing gear lock pins are installed thru each main gear and main gear door mechanism - work platforms or ladders are set up and properly grounded - access to firewall terminal block is gained - inspection of the terminal block for presence of insulating sleeves is done - installation of the insulating sleeves or replacement of damaged terminal block assembly is done if necessary - close out.

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 3 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 D. Compliance Bombardier Inc. recommends the accomplishment of this special inspection/rectification service bulletin at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. Transport Canada Airworthiness Directive CF-2014-03. 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). F. Manpower It will take an estimated 2 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 0.50 Procedure 1.00 Test / RTS 0.00 Close-Out 0.50 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 None

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 4 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 H. Tooling - Price and Availability None I. Weight and Balance None
J. Electrical Load Data Not affected
K. Publications Affected Maintenance Manual PSM 1-8-2 and

................................ PSM 1-82-2 and PSM 1-83-2 L. References Revision ‘A’ of this service bulletin was prepared to the related data that follows: Mod 8/1926 issue 6 (for reference only) PCA 07315 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive CF-2014-03. 2. MATERIAL INFORMATION A. Parts Required Per Aircraft Quantity Per Aircraft Part Number Description Remarks
2 82450079-101 Insulating Sleeve As required 2 82450079-103 Insulating Sleeve As required 2 82450075-001* Terminal Block Assembly As required

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 5 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 *Terminal Block Assembly 82450075-001 already includes one insulating sleeve 82450079-101 and one insulating sleeve 82450079-103. There is one terminal block assembly per nacelle. The above parts may be required for the completion of this service bulletin and may be procured as single items from Bombardier Aerospace Regional Aircraft or purchased directly from industry sources. 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 PSM 1-8-2 and PSM 1-83-2 AMM TASKs 12-00-05-00 and 24-00-00-02 and to PSM 1-82-2 AMM TASKs 12-00-05-861-804 and 24-00-00-910-803). (2) Make sure that lock pins are installed through each main gear and main gear door mechanism. (3) Make sure the nose gear ground lock is engaged. (4) Set wheel chocks in front and behind the landing gear tires. (5) Set up the work platforms or ladders as required to gain access to LH and RH Nacelles. Make sure the work platforms or ladders are electrically grounded.

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 6 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 (6) Open the access panels that follow to gain access to firewall terminal block (number 1 nacelle-2431-1/TB1, number 2 nacelle-2431-2/TB2) (refer to AMM TASK 06-40-10-00 for locations): NACELLE UPPER PANEL SIDE PANELS NUMBER 1 (LEFT) 412DT 415AL, 416AR NUMBER 2 (RIGHT) 422DT 425AL, 426AR B. Procedure NOTE: In this procedure, “damage” is considered to exist if any of the conditions that follow are found: - pitting of the firewall or terminal block conductive bushing due to arcing between the two - oxidation of the terminal block bushing where the sleeve was missing - cracked, torn or worn sleeving. (1) Do a detailed visual inspection of the RHS nacelle firewall 85410222 and terminal block assembly 82450075-001 as follows (Refer to Figures 1, 2, 3, and 4): (a) On the forward side of the nacelle firewall, make sure there is no damage to the nacelle firewall around the terminal block. (b) Looking from the forward side of the terminal block, make sure the insulating sleeves are installed on the copper bushings of the terminal block. Make sure the insulating sleeves are properly installed and have no damage. (2) If no damage is found to the nacelle firewall and terminal block and the insulating sleeves are installed on terminal block and have no damage, do the Close Outas no corrective action is necessary. (3) If no insulating sleeves are installed, or the existing sleeves are damaged, and there is no damage to nacelle firewall and terminal block, install replacement insulating sleeves as follows (refer to Figure 1 Sheets 1 and 2): (a) On the forward side of the firewall, disconnect the DC power cables from the terminal block. Keep the hardware for reinstallation.

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 7 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 (b) Install replacement insulating sleeves 82450079-101 and 82450079-103. (c) Connect existing 3/8 feeder cable lug on forward side of terminal block 82450075-001 with flat washer NAS1070-616, spring washer B0750-056-S and nut MS21043-6. Position lug as required and torque bolt. Refer to torquing procedure. Observe hardware stack-up as shown in Figure 1 Sheet 1. (d) Connect existing 5/16 feeder cable lug on forward side of terminal block 82450075-001 with flat washer NAS1070-516, spring washer B0625-047-S and nut MS21043-5. Position lug as required and torque bolt. Refer to torquing procedure. Observe hardware stack-up shown in Figure 1 Sheet 1. (e) Refer to Figure 1 and carefully confirm the correct hardware stack up for each terminal block connection. (4) If no insulating sleeves are installed and there is no damage to nacelle firewall but there is damage to terminal block, replace the terminal block assembly as follows: (a) Remove damaged terminal block. Discard terminal block and attaching hardware. (b) Install replacement terminal block assembly with four bolts NAS5903-12, washers AN960C10L and nuts MS21043-3 (refer to Figure 1 Sheet 1). Make sure terminal block conductors are centered in the firewall terminal holes as the mounting bolts are tightened. NOTE: Teflon sleeves over terminal block conductors serve to maintain minimum clearance during the block mounting procedure. CAUTION: MAKE SURE THAT THE INSULATION SLEEVES ARE RETAINED ON TERMINAL BLOCK ASSEMBLY DURING TERMINAL BLOCK INSTALLATION. FAILURE TO DO THIS COULD RESULT IN DAMAGE TO THE FIREWALL OR NEARBY EQUIPMENT.

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 8 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 (c) Install existing bus bar 82440059-101 to aft side of terminal using flat washer NAS1070-616, spring washer B0750-056-S, bolt NAS1306-20 and on the forward side connect 3/8 feeder cable lug with flat washer NAS1070-616, spring washer B0750-056-S and nut MS21043-6. Position lugs as required and torque bolt. Refer to torquing procedure. Observe hardware stack-up as shown in Figure 1 Sheet 1. (d) Install existing 5/16 feeder cable lugs on forward and aft side of terminal block 82450075-001 with bolt NAS1305-21, two flat washers NAS1070-516, spring washers B0625-047-S and nut MS21043-5. Position lugs as required and torque bolt. Refer to torquing procedure. Observe hardware stack-up shown in Figure 1 Sheet 1. (e) Refer to Figure 1 Sheet 1 and carefully confirm the correct hardware stack up for each terminal block connection. (5) If no insulating sleeves are installed and damage to the nacelle firewall and terminal block is found, contact Technical Help Desk by telephone at 416-375-4000 or email at: thd.qseries@aero.bombardier.com for approved disposition/action. (6) Repeat steps (1) to (5) for the LHS nacelle firewall and terminal block assembly. C. Close Out (1) Remove all tools and equipment from the work area. (2) Close the access panels that follow (refer to AMM TASK 06-40-10-00 for locations): NACELLE UPPER PANEL SIDE PANELS NUMBER 1 (LEFT) 412DT 415AL, 416AR NUMBER 2 (RIGHT) 422DT 425AL, 426AR (3) On completion of this service bulletin, make the following entry in the appropriate logbooks: “Service Bulletin 8-24-92 (i.e. Electrical Power - DC System - Starter/Generator Firewall Terminal Block Special Inspection and Rectification of Missing insulating Sleeves) accomplished.”

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 9 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 Terminal Block Installation Figure 1 (Sheet 1) NAS1306--20 BOLT

B0750--056--S SPRING WASHER 2 REQD MS21043--6 NUT

NAS5903--12 BOLT 4 REQD AN960C10L WASHER 4 REQD MS21043--3 NUT 4 REQD NAS1070--516 WASHER 2 REQD

NAS1305--21 BOLT NAS1070--616 WASHER 2 REQD

MS21043--5 NUT 82440059--101 BUS BAR 82450075--001 TERMINAL

B0625--047--S SPRING WASHER 2 REQD BLOCK ASSY A

A

B 82450079--101 INSULATING SLEEVE 82450079--103 INSULATING SLEEVE NACELLE FIREWALL

2

1

1
2 MS21043--5 FINAL TORQUE = RUN DOWN TORQUE (IN--LBS) + 65 IN--LBS MS21043--6 FINAL TORQUE = RUN DOWN TORQUE (IN--LBS) + 90 IN--LBS 5/16 FEEDER CABLE LUG 3/8 FEEDER CABLE LUG

FWD NACELLE AFT NACELLE (ROTATED 90 ̊ CW FOR CLARITY)

(ROTATED 90 ̊ CCW FOR CLARITY) (SEE SHEET 2 FOR DETAILS)

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 10 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 Terminal Block Installation Figure 1 (Sheet 2) NOTE Trim insulated sleeve flush with mounting block after installation. 82450079--101 INSULATING SLEEVE 82450079--103 INSULATING SLEEVE 

### C

C

SECTION

### C-C TERMINAL BLOCK ASSY 82450075-001

BUSHING

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 11 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 

## A

Terminal Block Inspection Figure 2 

## VIEW

# A 82450079-101

INSULATING SLEEVE

82450079-103

INSULATING SLEEVE

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 12 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014Terminal Block With Insulating Sleeves Figure 3 INSULATING SLEEVE INSULATING SLEEVE 824500079-101

824500079-103

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 13 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 Terminal Block Without Insulating Sleeves Figure 4 SIGN OF DAMAGE DUE TO ARCING

### SERVICE BULLETIN 8-24-92

S.B. 8-24-92 Page 14 of 14 25 Sep 2013 NB Revision ‘A’ 11 Apr 2014 

### This Page Intentionally BlankJan 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 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