Revision ‘C’ 28 Jun 2011 DHC ---8 (DASH 8) SERVICE BULLETIN 84 ---52 ---69 Doors --- Passenger/Crew Airstair --- Seal System Shut Off Valve Control Logic Change --- ModSum 4 ---126513 This page transmits Revision ‘C’ of Service Bulletin 84 ---52 ---69, pages 1 thru 22, dated 28 Jun 2011. This service bulletin is re ---issued in its entirety for the reasons that follow: the References section is revised to convey the latest revision of the service bulletin and engineering documentation the Material Information section, para C, step (2) is revised to add a figure reference number 7. The Compliance in the previous issue(s) 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 ---52 ---69 Revision ‘B’ and replace with attached. Previous issues of Service Bulletin 84 ---52 ---69: Initial issue --- Pages 1 thru 14 dated 28 Jan 2011 Revision ‘A’ --- Pages 1 thru 22 dated 26 Apr 2011 Revision ‘B’ --- Pages 1 thru 22, dated 09 May 2011

# D

S.B. 84 ---52 ---69 Page 1 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 5211 NUMBER: 84 ---52 ---69 

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

SUBJECT: Doors --- Passenger/Crew Airstair --- Seal System Shut Off Valve Control Logic Change --- ModSum 4 ---126513

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Model 401 and 402 Serial Number 4001 thru 4361. 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 ---52 ---69

S.B. 84 ---52 ---69 Page 2 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 B. Reason Problem: Existing airstair door pneumatic shut ---off valve control logic wiring requires both Input/Output Modules (IOM’s) to indicate airspeed less than 100 knots to de ---energize the valve and deflate the airstair door seal. Incase of a single IOM failure in greater than 100 knots state, the door seal may be prevented from deflating on the ground. Solution: This service bulletin incorporates wiring changes to allow deflation of airstair door seal if either IOM indicates airspeed less than 100 knots. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- AFM Temporary Amendment #24 must be removed when ModSum 4 ---126513 is installed --- 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 --- new wires are added --- new splices are added --- a return to service procedure of the airstair door seal is done --- close out. D. Compliance Bombardier Inc. recommends incorpora tion of ModSum 4 ---126513 at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority.

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 3 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 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 12 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 2.00 Access 4.00 Wiring Test / RTS 2.00 Close ---Out 3.00 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 ModKits 8MK4461 ---001 and 8MK4464 ---001 are available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order s pecifying 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

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 4 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Kit Number Description 8MK4461 ---001 Retrofit --- Airstair Door System Shut Off Valve (A/C 4001 --- 4094) 8MK4464 ---001 Retrofit --- Airstair Door System Shut Off Valve (A/C 4095 --- 4361)
H. Tooling --- Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Flight Manual PSM 1 ---84 ---1A

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

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

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

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 5 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 L. References Revision ‘C’ of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4461 1 A

8Z9287 1

--- --- 8Z9287 2

--- --- 8MK4464 1 C

8Z9293 1 B 8Z9293 2 A ModSum 4Q126513 Rev. ‘G’ ModSum 4 ---126513 Rev. ‘G’ PCA 43132 Revision 2 (for internal reference only) 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft For Modification Kit 8MK4461 ---001: (1) Modification Kit 8MK4461 ---001, Retrofit --- Airstair Door System Shut Off Valve for aircraft serial number 4001 thru 4094 (2) Detailed Kit Content: Quantity Per Kit ---001 Part Number Description Remarks
1 8Z9287 ---013 Cable Assembly 1 8Z9287 ---011 Cable Assembly 2 DSC347 ---1/8 ---2.00 ---9 ID Sleeve see Note 1 2 M81824/1 ---2 Splice 100 CR4H Connector Ring 100 B0816019 ---003 Strap Tie Down see Note 2 For Modification Kit 8MK4464 ---001: (3) Modification Kit 8MK4464 ---001, Retrofit --- Airstair Door System Shut Off Valve for aircraft serial number 4095 thru 4361.

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 6 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 (4) Detailed Kit Content:

Quantity Per Kit ---001 Part Number Description Remarks
1 M81824/1 ---1 Splice #16 ---20 1 600 ---057 Band Clamp 1 8Z9293 ---011 Cable Assembly 2 M81824/1 ---2 Splice #16 ---20 2 DSC347 ---1/8 ---2.00 ---9 ID Sleeve see Note 1 100 CR4H Connector Ring 100 B0816019 ---003 Strap Tie Down see Note 2
NOTE 1 : P/N 3PS ---125 ---2 ---WT from Brady W.H Corp (cage code 85480) or TMS ---SCE 1/8 ---2.0 ---9 from Tyco Electronics (cage code 06090) can be used as an alternative.
NOTE 2 : P/N TY25M* from Thomas and Betts (cage code 56501) can be used as an alternative. ‘*’ is the order quantity. 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.

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 7 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 (3) Make sure the nose gear ground lock is engaged. (4) Remove forward lower wardrobe. Refer to Maintenance Manual Task 25 ---24 ---03 ---000 ---801. (5) For aircraft serial number 4095 thru 4361 only. Remove floor access panels 131BZ and 131CZ. Refer to AMM Task 06 ---43 ---00 ---992 ---801. B. Procedure (For aircraft serial numbers 4001 thru 4094)
NOTE: If applicable, circuit breaker collar installed by IS4Q5250025 must be removed when ModSum 4 ---126513 is installed. (1) Reterminate the following wires as follows: Refer to Figure 1

NOTE: Splices 5213 ---E1 and 5213 ---E4 are within 12 inches of connector 3140 ---P1A ---A1. Refer to Figure 1, Note 1.
NOTE: Existing splice 5213 ---E2 and new splice 5213 ---E3 to be as close as possible to connector 9811 ---J161. Refer to Figure 1, Note 2
NOTE: Wires to be routed with existing compatible EMC/Wire codes using tie wraps and connector rings.

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 8 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 (2) Install the following wire to create cable assembly 8Z9287---011: Refer to Figure 1

NOTE: P/N 55PC0211 ---22 ---9 from Tyco Electronics (cage code 06090) can be used as an alternative (see Note below) 22 GAUGE WIRE 15 FEET

(3) Install the following wires to create cable assembly 8Z9287---013: Refer to Figure 1

NOTE: P/N 55PC0211 ---22 ---9 from Tyco Electronics (cage code 06090) can be used as an alternative (see Note below) 22 GAUGE WIRE 23 FEET

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 9 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011Wiring DiagramFigure 1CABLE ASSEMBLY8Z9287 ---011CABLE ASSEMBLY8Z9287 ---013NOTE 1:Splices 5213 ---E1 and 5213 ---E4 are within12 inches of connector 3140 ---P1A ---A1.SEE NOTE 1 andNOTE 2:Existing splice 5213 ---E2 and new splice5213 ---E3 to be as close as possible to connector 9811 ---J161.SEE NOTE 2

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 10 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Plan View Figure 2Refer to Figure 4 forForward Continuation

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 11 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Relay Rack Figure 3

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 12 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Isometric View Looking Outboard at Avionics Rack Location Figure 4 Refer to Figure 2 for Aft Continuation

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 13 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Detail A (Partial Wiring Shown) Figure 5

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 14 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Isometric View Looking Aft on Avionics Rack Figure 6

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 15 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 C. Procedure (For aircraft serial numbers 4095 thru 4361)
NOTE: If applicable, circuit breaker collar installed by IS4Q5250025 must be removed when ModSum 4 ---126513 is installed. (1) Reterminate the following wires as follows: Refer to Figure 7

NOTE 1: Existing splice 5213 ---E2 and new splice 5213 ---E3 to be approximately 12 inches from connector 9811 ---RJB1 ---P1B.
NOTE 2: Wires to be routed with existing compatible EMC/Wire codes using tie wraps and connector rings.
NOTE 3: If splice 5213 ---E1 is not in visible part of existing harness then maybe within backshell of connector 3140 ---P1A ---A1.
NOTE 4: Band clamp required within backshell.

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 16 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 (2) Install the following wires to create cable assembly 8Z9293---011: Refer to Figure 7.

NOTE: P/N 55PC0211 ---22 ---9 from Tyco Electronics (cage code 06090) can be used as an alternative (see Note below)

22 GAUGE WIRE 36 FEET

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 17 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011Wiring DiagramFigure 7BAND CLAMP600 ---057(required within backshell)see Note 1see Note 3NOTE 1:Existing splice 5213 ---E2 and new splice 5213 ---E3to be approximately 12 inches from connector9811 ---RJB1 ---P1B.NOTE 3:If splice 5213 ---E1 is not in visible part of existingharness then maybe within backshell of connector3140 ---P1A ---A1.CABLE ASSEMBLY8Z9293 ---011CABLE ASSEMBLY 8Z9293 ---011

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 18 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 View Looking Outboard on Left Hand Side Figure 8

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 19 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011Wiring RouteFigure 9

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 20 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011Wiring Route (View Looking Down)Figure 10

### SERVICE BULLETIN 84 ---52 ---69

S.B. 84 ---52 ---69 Page 21 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 D. Close Out (1) Remove all tools and equipment from the work area. (2) Perform a test of the Airstair Door seal per the enclosed return to service procedure (RTS). (3) Install forward lower wardrobe. Refer to Maintenance Manual Task 25 ---24 ---03 ---400 ---801. (4) Install floor access panels 131BZ and 131CZ. Refer to Maintenance Manual Task 06 ---43 ---00 ---992 ---801. (on aircraft serial number 4095 thru 4361 only) (5) 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 ---52 ---69

S.B. 84 ---52 ---69 Page 22 of 22 RL 28 Jan 2011 Revision ‘C’ 28 Jun 2011 Note: Wait 30 seconds for completion of Power On Self Test (POST) before confirming expected results. see Note below

see Note below

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 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