# D

S.B. 84 ---32 ---75 Page 1 of 10 01 Jun 2010 MG 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3221 NUMBER: 84 ---32 ---75


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

SUBJECT: Landing Gear --- Nose Landing Gear Mechanism --- Linkage Assembly --- Special Inspection and Rectification --- ModSum 4 ---113675

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4006, 4008, 4012 thru 4015, 4018 thru 4023, 4073 thru 4197. 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 ---32 ---75

S.B. 84 ---32 ---75 Page 2 of 10 01 Jun 2010 MG B. Reason Problem: A number of spare non ---conforming pushrods (used in the NLG door mechanism) were supplied to Goodrich and were installed on some aircraft. Solution: Do a part number inspection of the left hand side pushrod. If the part number matches one of the 34 suspect lot numbers the operator should order the replacement modkit and replace the pushrod. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- aircraft electrical power is removed --- main landing gear lock pins are installed thru each main gear and main gear door mechanism --- the NLG ground lock is engaged --- the lot number of the left hand side pushrod for the NLG door mechanism is inspected and recorded --- if the lot number matches one of the 34 suspect lot numbers the pushrod is replaced with a nonsuspect pushrod. An operational check of the NLG doors is done after the pushrod replacement --- close out. D. Compliance Bombardier Inc. recommends incorporation of Service Bulletin 84 ---32 ---75 at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. 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 ---32 ---75

S.B. 84 ---32 ---75 Page 3 of 10 01 Jun 2010 MG F. Manpower It will take an estimated 1.25 man ---hours to complete the Special Inspecton section of 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 0.25 Test / RTS N/A Close ---Out (ifRectification not required) 0.50

In addition, it will take an estimated 6.00 man ---hours to complete the Rectification section of 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 4.00 Test / RTS 1.00 Close ---Out 0.50 G. Material --- Price and Availability If required, ModKit 8MK4279 ---001 is available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order specifying 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 ---32 ---75

S.B. 84 ---32 ---75 Page 4 of 10 01 Jun 2010 MG Kit Number Description 8MK4279 ---001 Retrofit Kit --- Push Rod Assembly Replacement --- NLG
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

.................................. L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4279 1 B ModSum 4Q113675 Rev. ‘A’ ModSum 4 ---113675 Rev. ‘A’ PCA 40535 Revision 2 (for internal reference only) Transport Canada Airworthiness Directive Pending 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft (1) Modification Kit 8MK4279 ---001, Retrofit Kit --- Push Rod Assembly Replacement --- NLG

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 5 of 10 01 Jun 2010 MG (2) Detailed Kit Content:

Quantity Per Kit ---001 Part Number Description Remarks

1 83232012 ---951 Pushrod ---NLG 2 MS24665 ---153 Cotter Pin 4 AN960 ---516 Washer B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability The following parts may be affected by this service bulletin. Indented parts are components of the next higher assembly. The quantity (Qty.) column lists the quantity that may be affected per aircraft for non ---indented parts and the quantity per next higher assembly for indented parts.
Existing Part Number Description Qty. IC DC New Part Number PNC 83232012 ---001 Pushrod ---NLG 1 C DES 83232012 ---951 N IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition DES Destroy Part. MUI Multiple Usage Item: Return to stock if serviceable. RWK Rework existing part in accordance with this service bulletin. RWI Rework existing part per ..... SAL Salvage. Return to operator’s stores for salvage consideration.

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 6 of 10 01 Jun 2010 MG PNC Part Number Code N New part. R Part number after rework. S Superseding or equivalent part number. X Existing part and new part are functionally and physically equivalent but not identical. 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set ---Up (1) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS (refer to AMM TASK 24 ---00 ---00 ---861 ---802 and TASK 24 ---00 ---00 ---910 ---801). (2) Make sure that lock pins are installed thru each main gear and main gear door mechanism. WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED. IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
WARNING: BE SURE THAT THE HYDRAULIC PRESSURE IS OFF, AND THAT THERE IS NO PRESSURE IN THE HYDRAULIC SYSTEM. IF YOU DO NOT DO THIS YOU CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. (3) Make sure the NLG ground lock is engaged. B. Procedure

Special Inspection (1) Refer to Figure 1 and gain access to the NLG door linkage. NOTE: The lot numbers identified below, are identified by ink stamp on the bell crank assembly and is also recorded on the C of C shipped with the unit. This lot number is the GLC work order number, identified with the WO prefix.

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 7 of 10 01 Jun 2010 MG (2) Inspect the lot number of the pushrod and compare it with the lot numbers in table below. If the lot number matches with any in the table, go to the Rectificationsection and replace the pushrod. If the lot number does not match with any in the table, go to the Close Out section and complete the service bulletin. ASSEMBLY PART NUMBER LOT NUMBER 83232012 ---001 50989, 50990, 52770, 54671, 54672, 56907, 56908, 56909, 56910, 59187, 59188, 62108, 62109, 62110, 62111, 62112, 62113, 62114, 64192, 64193, 65788, 69856, 74759, 74760, 74761, 74762, 77155, 77156, 79516, 79517, 79518, 79519, 86489, 86490 Rectification (3) Refer to Figure 2 and applicable steps in AMM TASK 32 ---22 ---16 ---000 ---801 and remove push rod 83232012 ---001 from aft left nose landing gear door. Destroy the pushrod. (4) Refer to applicable steps in AMM TASK 32 ---22 ---16 ---400 ---801 and install new push rod 83232012 ---951. (5) Refer AMM TASK 32 ---31 ---00 ---710 ---801 and do the operational test of the landing gear primary extension and retraction system C. Close Out (1) Remove all tools and equipment from the work area. (2) On completion of this service bulletin, make the following entry in the appropriate logbooks: “Service Bulletin 84 ---32 ---75 {Landing Gear --- Nose Landing Gear Mechanism --- Linkage Assembly --- Special Inspection and rectification} accomplished.”

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 8 of 10 01 Jun 2010 MG Location of NLG Mechanism Figure 1

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 9 of 10 01 Jun 2010 MG NLG Mechanism --- View Looking Aft Figure 2 PUSHROD 83232012 ---951 QTY: 1 WAS PUSHROD 83232012 ---001 QTY: 1 COTTER PIN MS24665 ---153 QTY: 1 WASHER AN960 ---516 QTY:2 BOLT NAS1105 ---12D REF. BUSHING NAS75 ---5 ---006 REF. NUT MS14145L5 REF. COTTER PIN MS24665 ---153 QTY: 1 WASHER AN960 ---516 QTY:2 BOLT NAS1105 ---12D REF. BUSHING NAS75 ---5 ---006 REF. NUT MS14145L5 REF. BELLCRANK REF.

### SERVICE BULLETIN 84 ---32 ---75

S.B. 84 ---32 ---75 Page 10 of 10 01 Jun 2010 MG 

### This Page Intentionally Blank 1Jan 2009 SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION --- Q SERIES DASH 8 AIRCRAFT To: Partner Data Co ---Ordinator (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 3534 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 VSpecial Tools/Equipment V Parts to Modify Spares V Consumables V Disposition of Existing Parts V Other
3. ACCOMPLISHMENT INSTRUCTIONS VJob 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