Revision ‘A’ 24 Oct 2011 DHC-8 (DASH 8) SERVICE BULLETIN 84-52-66 Doors - Machined Handle Shaft - Aft Entry & Aft Service Doors - Replacement - ModSum 4-113687 This page transmits Revision ‘A’ of Service Bulletin 84-52-66, pages 1 thru 6, dated: 24 Oct 2011. This service bulletin is re-issued in its entirety for the reasons that follow: the Effectivitysection is revised to change serial numbers affected the Referencessection is revised to convey the latest revision of the service bulletin and engineering documentation theAccomplishment Instructionssection is revised to provide correct Maintenance Manual Task 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 previous issue of Service Bulletin 84-52-66 and replace with attached. Previous issues of Service Bulletin 84-52-66: Initial issue - Pages 1 thru 6 dated 25 Jul 2011

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S.B. 84-52-66 Page 1 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 5241 NUMBER: 84-52-66 

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

SUBJECT: Doors - Machined Handle Shaft - Aft Entry & Aft Service Doors - Replacement - ModSum 4-113687

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003 thru 4364. 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 84-52-66

S.B. 84-52-66 Page 2 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR B. Reason Problem: There have been issues reported of door handle loads increasing and one instance of a door handle jamming on opening. These conditions might be caused by the pins on the existing handle shaft migrating and causing the handle to jam. A jammed handle could prevent the opening of the door. Solution: This Mod allows for the in-service replacement of the existing aft entry & aft service door internal handle shaft with the single piece machined handle shaft. 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 - the existing aft entry & aft service internal door handle shaft is removed and discarded - a new aft entry & aft service internal door handle shaft is installed - a functional test of the aft entry & aft service doors is done - close out. D. Compliance Bombardier Inc. highly recommend that ModSum 4-113687 be incorporated at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. 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. This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs).

### SERVICE BULLETIN 84-52-66

S.B. 84-52-66 Page 3 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR F. Manpower It will take an estimated 6.75 man-hours (per door) 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 6.00 Test / RTS 0.25 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 The parts detailed in Paragraph 2.A. may be obtained from any Bombardier Aerospace Regional Aircraft authorized parts source. The price and availability will be quoted at the time of order. H. Tooling - Price and Availability None 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

.................................. Maintenance Requirement Manual PSM 1-84-7

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### SERVICE BULLETIN 84-52-66

S.B. 84-52-66 Page 4 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR L. References Revision ‘A’ of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV

8DK4169 1 C ModSum 4Q113687 Rev. ‘G’ ModSum 4-113687 Rev. ‘G’ PCA 41838 Revision 1 (for internal reference only) Transport Canada Airworthiness Directive Pending 2. MATERIAL INFORMATION A. Parts Required Per Aircraft (1) Detailed Parts List: Quantity Per Aircraft Part Number Description Remarks

1 85217916-116 Handle Shaft 1 85217916-115 Handle Shaft B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None

### SERVICE BULLETIN 84-52-66

S.B. 84-52-66 Page 5 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR 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 aft entry & aft service doors. Make sure the work platforms or ladders are electrically grounded. B. Procedure (1) Remove and discard existing internal handle shaft from the aft entry door. Refer to Maintenance Manual Task 52-12-01-000-802. (2) Install new internal handle shaft 85217916-115 on the aft entry door. Refer to Maintenance Manual Task 52-12-01-400-802 and to Figure 1. (3) Remove and discard existing internal handle shaft from the aft service door. Refer to Maintenance Manual Task 52-41-01-000-802. (4) Install new internal handle shaft 85217916-116 on the aft service door. Refer to Maintenance Manual Task 52-41-01-400-802 and to Figure 1. 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 84-52-66

S.B. 84-52-66 Page 6 of 6 25 Jul 2011 Revision ‘A’ 24 Oct 2011 JR Aft Entry & Aft Service Doors Location Figure 1 AFT ENTRY DOOR AFT SERVICE DOOR

9Jan 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 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 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