Revision ‘B’ 02 Jan 2014 DHC-8 (DASH 8) SERVICE BULLETIN 84-36-04 Pneumatics - Ice & Rain Protection and Bleed Air System - Segregation of HPSOV Power Supply from TMU - ModSum 4-110595 This page transmits Revision ‘B’ of Service Bulletin 84-36-04, pages 1 thru 20, dated: 02 Jan 2014. This service bulletin is re-issued in its entirety for the reasons that follow:

- The PLANNING INFORMATION D. Compliancesection is revised to add Transport Canada Airworthiness Directive CF-2013-27

- The Referencessection is revised to convey the latest revision of the service bulletin and engineering documentation

- TheACCOMPLISHMENT INSTRUCTIONSsection is revised to correct Wiring Diagram Figure 8 connector pin on 9811-P421 was N now N-. Added to Figure 1 thru Figure 7 the title Segregation of HPSOV Power Circuit From TMU 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 the previous issue of this Service Bulletin 84-36-04 and replace with attached. Previous issues of Service Bulletin 84-36-04: Initial issue - Pages 1 thru 20 dated 13 Mar 2013

# D

S.B. 84-36-04 Page 1 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3600 NUMBER: 84-36-04 

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

SUBJECT: Pneumatics - Ice & Rain Protection and Bleed Air System - Segregation of HPSOV Power Supply from TMU - ModSum 4-110595

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003 thru 4446. Production: ModSum 4-110595 will be installed before delivery on applicable DHC-8 Aircraft at Serial Number 4447 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 84-36-04

S.B. 84-36-04 Page 2 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD B. Reason Problem: The TMU (Timer and Monitor Unit) and HPSOV (High Pressure Shut-off Valve) are currently on the same 1 amp circuit breaker and because the TMU is a class one installation it should have a separate power source than any other component. In addition the HPSOV is critical to provide sufficient de-ice pressure to the system. When the circuit breaker pops there are numerous caution lights appearing and operators have to exit icing conditions. Solution: This service bulletin provides instructions to segregate the power source for the TMU via a wiring change. 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 - access panels are opened - some wires are reterminated and new wires are added - a return to service procedure is done - close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4-110595 at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. Transport Canada Airworthiness Directive CF-2013-27. 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 84-36-04

S.B. 84-36-04 Page 3 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD F. Manpower It will take an estimated 9 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 6.00 Test / RTS 1.00 Close-Out 1.00 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 parts detailed in Paragraph 2.A. may be either furnished or fabricated from the operator’s existing stock, purchased as single items from Bombardier Aerospace Regional Aircraft or purchased directly from industry sources. H. Tooling - Price and Availability None I. Weight and Balance
A/C Type and Model Weight (Lb) Arm (Inches) Moment (Inches x Lb) x 0.001 DHC-8 Model 401/402 KIT - 8DK4224-001 +0.43 103.18 +0.04

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S.B. 84-36-04 Page 4 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD J. Electrical Load Data 1. Direct Current Loads Applicability Amperes Bus ECS/BA Cont R Auto see Type of Load Data Change below R Main DC ECS/BA Cont L Auto see Type of Load Data Change below L Main DC
2. Alternating Current Loads Not Affected 3. Type of Load Data Change Type Nominal Maximum Other Information Cyclic

OR Intermittent OR Continuous +0.20A +0.20A see Note 1 below
NOTE 1: Applicable to operating conditions (OC) 1 through 8.
K. Publications Affected Maintenance Manual PSM 1-84-2

................................ Wiring Diagrams Manual PSM 1-84-2W

............................ Fault Isolation Manual PSM 1-84-23

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

.................................. Weight and Balance Manual (Imperial) PSM 1-84-8

................ Weight and Balance Manual (Metric) PSM 1-84-8M

..................

### SERVICE BULLETIN 84-36-04

S.B. 84-36-04 Page 5 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD L. References Revision ‘B’ of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV

8DK4224 1
--

8Z6405 1 B 8Z6405 2 A ModSum 4Q110595 Rev. ‘D’ ModSum 4-110595 Rev. ‘D’ PCA 44151 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive CF-2013-27. 2. MATERIALINFORMATION A. Parts Required Per Aircraft (1) Detailed Parts List:Quantity Per Aircraft Part Number Description Remarks
2 FEET DSC230-6HT SPIRAL WRAP see NOTE 1 5 CSCS-M CABLE SPACER CROSS 30 CR4H CONNECTOR RING 50 B0816019-003 TIE STRAP see NOTE 2 4 M39029/56-351 CONTACT SOCKET 2 M81824/1-2 SPLICE 2 M81824/1-1 SPLICE 46 FEET B0801150-20-9 WIRE 20AWG see NOTE 3 NOTE 1: AMP (09482) P/N 500023 or Panduit (06383) P/N T12T or Zeus (6Y909) P/N 2E125SCL9 are acceptable alternates. NOTE 2: Panduit (06383) P/N PLT2S-(*)76 is an acceptable alternate. (*) indicates quantity.

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S.B. 84-36-04 Page 6 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD NOTE 3: Judd (12703) P/N JWB0801150-20-9 or Tyco (K1010) P/N 55PC0211-20-9 are acceptable alternates B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None 3. ACCOMPLISHMENTINSTRUCTIONS 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 IN THE DOOR MECHANISMS OF THE MLG AND NLG. THE DOOR MECHANISMS CAN ACCIDENTALLY CLOSE THE LANDING GEAR DOORS. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. (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 through each main gear and main gear door mechanism. (3) Make sure the nose gear ground lock is engaged. (4) On the LHS remove passenger seats from the airstair door up to station X236.00, refer to AMM Task 25-21-01-000-801. (5) Remove centre aisle carpet as well as carpet on the LHS from flight compartment door up to station X236.00, refer to AMM Task 25-25-06-000-801.

### SERVICE BULLETIN 84-36-04

S.B. 84-36-04 Page 7 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD (6) Remove the following floor boards, refer to AMM Task 06-43-00-992-801 for location: - wardrobe floor - 133AZ to 133FZ - 131CZ to 131GZ B. Procedure (1) Reterminate the following wires (one end only): NOTE: Remove any excess wire or tape and stow both ends of the remaining wire. Refer to wiring diagram Figure 8 for length of wire and physical location of splices.

(2) Reterminate the following wires (one end only): NOTE: Refer to wiring diagram Figure 8 for length of wire and physical location of splices.

NOTE: Maximum wire length of 6 inches is required in order to keep splices close to the connector, so they can be located and serviced if required. (3) Install new cable assemblies 8Z6405-011 and 8Z6405-013 as follows: NOTE: Cable assemblies 8Z6405-011 and -013 are not provided in a kit and are to be assembled by the operator using parts in section 2.A.(1). Refer to page 17 of this service bulletin for composition of cable assemblies.

### SERVICE BULLETIN 84-36-04

S.B. 84-36-04 Page 8 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD (a) Route with existing cable harness as shown with compatible way codes/EMC codes per WDM PSM 1-84-2W Chapter 20-12-10. (b) Use existing clipping where practical or use connector rings CR4H or cross spacers CSCS-M to maintain segregation. (c) Install splices close to connectors, maximum of 6 inches, to ease locating during maintenance and repair activities. Support splices in wire bundle using tie-down straps B0816019-003.

(d) Identify wires per WDM Task 20-10-00-201. C. Close Out (1) Remove all tools and equipment from the work area. (2) Do the enclosed Return to Service procedure (3) Install the following removed floor boards, refer to AMM Task 06-43-00-992-801 for location: - wardrobe floor - 133AZ to 133FZ - 131CZ to 131GZ (4) Install removed carpet, refer to AMM Task 25-25-06-400-801. (5) On the LHS install removed passenger seats, refer to AMM Task 25-21-01-400-801. (6) On incorporation of this ModSum, add the weight and balance data shown in Section 1 of this service bulletin to the Weight and Balance Manual PSM 1-84-8. Under ‘Description of Change’ enter “ModSum 4-110595 incorporated.” (7) 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 84-36-04

S.B. 84-36-04 Page 9 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MDSegregation of HPSOV Power Circuit From TMU - Plan ViewFigure 1

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S.B. 84-36-04 Page 10 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD Segregation of HPSOV Power Circuit From TMU - View B-B Figure 2

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S.B. 84-36-04 Page 11 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD (ECS DUCT)

Segregation of HPSOV Power Circuit From TMU - View C-C Figure 3

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S.B. 84-36-04 Page 12 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MDFigure 4Segregation of HPSOV Power Circuit From TMU - View D-D

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S.B. 84-36-04 Page 13 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD Segregation of HPSOV Power Circuit From TMU - View E-E Figure 5

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S.B. 84-36-04 Page 14 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD Segregation of HPSOV Power Circuit From TMU - View F-F Figure 6

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S.B. 84-36-04 Page 15 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD Segregation of HPSOV Power Circuit From TMU - Detail G Figure 7

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S.B. 84-36-04 Page 16 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD Wiring Diagram Figure 8

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S.B. 84-36-04 Page 17 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD see NOTE below see NOTE below

NOTE: Judd (12703) P/N JWB0801150-20-9 or Tyco (K1010) P/N 55PC0211-20-9 are acceptable alternates 4
5 6
7
9
10 STRAP TIE DOWN B0816019-003 CONNECTOR RING CR4H SPACER CROSS CSCS-M SPIRAL WRAP DSC230-6HT

CABLE ASSEMBLY 8Z6405-013CABLE ASSEMBLY 8Z6405-011 PARTS FIND NUMBER

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S.B. 84-36-04 Page 18 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD NOTES

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S.B. 84-36-04 Page 19 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD

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S.B. 84-36-04 Page 20 of 20 13 Mar 2013 Revision ‘B’ 02 Jan 2014 MD 

### 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