Revision ‘A’ 11 Jul 2013 DHC-8 (DASH 8) SERVICE BULLETIN 84-52-75 Doors - Aft Entry and Aft Service Doors - Translating Door Bolts not Properly Installed - Inspection and Rectification This page transmits Revision ‘A’ of Service Bulletin 84-52-75, pages 1 thru 12, dated: 11 Jul 2013. This service bulletin is re-issued in its entirety for the reasons that follow:

- the Description section is revised to include additional information regarding the inspection procedure

- the Manpowersection is revised to include an additional table for the inspection procedure

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

- the Parts Required Per Aircraftsection is revised to add an equivalent marker

- theACCOMPLISHMENT INSTRUCTIONSsection is revised to add an inspection Part A, a rectification Part B, a reference to four washers and add a CAUTION note - Figures 1 & 2are revised to add four washers - Figure 3 is added The Compliance in the previous issue of this service bulletin is not affected by this revision. Additional work to the aircraft is introduced by this revision. Remove the initial issue of Service Bulletin 84-52-75 and replace with attached. Previous issues of Service Bulletin 84-52-75: Initial issue - Pages 1 thru 10 dated 27 Jul 2012

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S.B. 84-52-75

Page 1 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR 

# SERVICE BULLETIN Customer Support

ATA SYSTEM: 5200 NUMBER: 84-52-75 

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

SUBJECT: Doors - Aft Entry and Aft Service Doors - Translating Door Bolts not Properly Installed - Inspection and Rectification

1. PLANNING INFORMATION
A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4002 thru 4411. Production: The intent of this service bulletin will be done before delivery on applicable DHC-8 Aircraft at Serial Number 4412 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 84-52-75

S.B. 84-52-75 Page 2 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR B. Reason Problem: There have been reports of loose or missing bolts on the door handle close mechanism crank assembly on some translating doors. Solution: This service bulletin gives instructions to inspect the secure state of the bolts attaching the crank assembly to the outside handle shaft and, if necessary, remove the two bolts on the crank assembly and re-install them using Loctite. 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 latch caps from the aft entry and aft service doors are removed - two bolts securing the door close mechanism crank assembly are visually and feel inspected for improper installation (Eg. bolt head not sitting properly, or loose) - If bolts are not installed properly, they are rectified immediately as follows: - the liner from the aft entry and aft service doors is removed - two bolts securing the door close mechanism crank assembly are removed - bolts are cleaned to remove any existing loctite - bolts are re-installed using loctite - if bolts have been installed properly the rectification is done at a later time - an operational test of the door is done - close out. D. Compliance Bombardier Inc. recommends incorporation of this service bulletin at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. Transport Canada Airworthiness Directive Pending.

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 3 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR 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 Part A - Inspection It will take an estimated 1.00 man-hour per door to complete the inspection. The breakdown of the man-hours is shown in the table that follows:
TASK MAN-HOURS Job Set-Up 0.25 Procedure 0.50 Test / RTS 0.00 Close-Out 0.25 Part B - Rectification It will take an estimated 6.75 man-hours per door to complete the rectification. 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

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 4 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR G. Material - Price and Availability None H. Tooling - Price and Availability None I. Weight and Balance None
J. Electrical Load Data Not affected
K. Publications Affected Maintenance Manual PSM 1-84-2

................................ L. References Revision ‘A’ of this service bulletin was prepared to the engineering drawings and related data that follows: Drawings 85217901 PCA 44073 Revision 0 (for internal reference only) Transport Canada Airworthiness Directive Pending.
2. MATERIALINFORMATION A. Parts Required Per Aircraft (1) The following material is 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. Addresses of manufacturers and suppliers not shown below are listed in either Maintenance Manual Chapter 20 or in Structural Repair Manual Chapter 51 or, for 400 Series Aircraft, in Consumable Products Manual PSM 1-84-18.

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 5 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR Part Number Qty. Per Aircraft Description Remarks Loctite 222MS Grade M as required Sealant MIL-S-46163
MK-Dalo-B3 (13-06) 1 Dalo Marker or equivalent B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None 3. ACCOMPLISHMENT INSTRUCTIONS
Part A - INSPECTION 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.

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 6 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR (3) Make sure the nose gear ground lock is engaged. (4) Set up work platforms or ladders as required to gain access to the aft entry and aft service doors. Make sure the work platforms or ladders are electrically grounded.
B. Procedure (1) On the aft entry door and aft service door, remove the outer latch cap and the inner main latch cap as follows: Refer to Figure 3 (a) Remove and keep pan head screw NAS603-8 & washer NAS1149D0332H. (b) Remove and keep outer latch cap 9505179, spacer NAS43DD3-8 and nylon washer 5610-609-31. (c) Remove and keep four screws MS24693S51, washers NAS1169C8L and inner main latch cap 9505179. (d) Do a detailed visual inspection of the two bolts NAS6204-3 (eg. bolt head not sitting properly, or loose) securing the crank assembly 85217919 to the housing to see if they are improperly installed. Open and close the door while visually inspecting both bolts for secure fit. Refer to Figure 1 & 2. (e) At the end of the close and open cycle, (once the crank assembly has stopped rotating) continue to hold the handle and feel the bolt heads for looseness while applying a slight load to the handle. (f) If there is any visual indication or feeling of the bolts being improperly installed, go to Part B RECTIFICATION of this service bulletin. (g) If there is no visual indication or feeling of the bolts being improperly installed, go to Close Out section of this Part A.
C. Close Out (1) Remove all tools and equipment from the work area. (2) Install the outer latch cap and the inner main latch cap using kept hardware. Refer to Figure 3.

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 7 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR (3) On completion of this service bulletin, make the following entry in the appropriate logbook(s): “Service Bulletin 84-52-75 - Doors - Aft Entry and Aft Service Doors - Translating Door Bolts not Properly Installed - Inspection and Rectification - Part A INSPECTION incorporated’’. Part B -RECTIFICATION 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) Set up work platforms or ladders as required to gain access to the aft entry and aft service doors. Make sure the work platforms or ladders are electrically grounded.
B. Procedure (1) Remove aft entry door liner. Refer to Maintenance Manual Task 25-26-21-000-801. (2) Remove aft service door liner. Refer to Maintenance Manual Task 25-26-26-000-801. (3) On the aft entry door and aft service door, remove two bolts NAS6204-3 and four washers NAS1149C0432R from crank assembly 85217919. Refer to Figures 1 & 2.

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 8 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR CAUTION: IN ORDER TO REMOVE ONE OR BOTH OF THE BOLTS, THE HANDLE MAY HAVE TO BE ROTATED TO GET ACCESS TO THE BOLTS, IN SUCH CASE BE CAREFUL THAT THE HANDLE DOES NOT SNAP BACK WHILE REMOVING THE BOLTS. (4) Clean bolts to remove any existing Loctite. (5) Apply Loctite 222 Grade M to the thread areas of the bolts and thread holes of the outside handle shaft. Refer to Maintenance Manual Task 51-23-11-390-801. (6) Re-install bolts and washers and torque to the required specifications. Refer to Maintenance Manual Task 20-10-01-430-801. (7) Recheck bolts per instructions in Part A, B. (1) (d) (e). (8) Identify part by applying a small red dot, adjacent to the sealed part using a Dalo marker or equivalent.
C. Close Out (1) Install aft entry door liner. Refer to Maintenance Manual Task 25-26-21-400-801. (2) Install aft service door liner. Refer to Maintenance Manual Task 25-26-26-400-801. (3) Remove all tools and equipment from the work area. (4) Do an operational test of the aft entry (passenger) door. Refer to Maintenance Manual Task 52-12-00-710-802, section 3.B. is not necessary. (5) Do an operational test of the aft service door. Refer to Maintenance Manual Task 52-41-00-710-801, section 3.B. is not necessary. (6) On completion of this service bulletin, make the following entry in the appropriate logbook(s): “Service Bulletin 84-52-75 - Doors - Aft Entry and Aft Service Doors - Translating Door Bolts not Properly Installed - Inspection and Rectification - Part B RECTIFICATION incorporated.”

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 9 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR Aft Entry Door Close Mechanism Figure 1 BOLT NAS6204-3 BOLT NAS6204-3 CRANK ASSEMBLY 85217919

OUTSIDE HANDLE SHAFT

Mechanism shown in the closed position WASHER NAS1149C0432R 2 REQUIRED WASHER NAS1149C0432R 2 REQUIRED

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 10 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR Aft Service Door Close Mechanism Figure 2 BOLT NAS6204-3 BOLT NAS6204-3 CRANK ASSEMBLY 85217919

OUTSIDE HANDLE SHAFT

Mechanism shown in the closed position 1 WASHER NAS1149C0432R 2 REQUIRED WASHER NAS1149C0432R 2 REQUIRED

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 11 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR Outer and Inner Latch Cap Figure 3 SCREW PAN HEAD NAS603-8 WASHER NAS1149D0332H SPACER NAS43DD3-8NYLON WASHER 5610-609-31 INNER MAIN LATCH CAP 9505179

WASHER DIMPLED NAS1169C8L SCREW COUNTERSUNK MS24693S51 OUTER LATCH CAP 9505179
1

### SERVICE BULLETIN 84-52-75

S.B. 84-52-75 Page 12 of 12 27 Jul 2012 Revision ‘A’ 11 Jul 2013 JR 

### 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