# D

S.B. 84-54-21

Page 1 of 14 09 May 2013 NB 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 5420 NUMBER: 84-54-21 

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

SUBJECT: Nacelles - A-Frame - Retrofit - Fasteners Reversed for Clearance to Retracted MLG Stabilizer Brace - ModSum 4-113774

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4003 thru 4055. Production: Aircraft Serial Numbers 4056 and subsequent do not have fasteners installed in the affected zones because they have Post-ModSum 4-113159 A-Frames.
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.

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 2 of 14 09 May 2013 NB Spares Affected: None B. Reason Problem: The clearance between the MLG stabilizer brace and the nacelle A-Frame was reduced with the introduction of MLG stabilizer brace 46400-27 thru Service Bulletin 84-32-93/ModSum 4-901992. Solution: This service bulletin introduces ModSum 4-113774. The ModSum reverses some fasteners to increase the clearance between the MLG stabilizer brace and the nacelle A-Frame. NOTE: If ModSum IS4Q5450002 was previously accomplished, no further action is required. If ModSum IS4Q5400016 was previously accomplished, the Procedure section of this service bulletin must be accomplished.
C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - nose landing gear lock is engaged - main landing gear lock pins are installed thru each main gear and main gear door mechanism - pressure in the No. 1, 2 & 3 hydraulic systems is depleted - all aircraft electrical power systems are selected to OFF - work platforms or ladders are set up and properly grounded - existing Hi-Lite fasteners are removed and replaced with new Hi-Lite fasteners with collars on forward side - reworked areas are re-finished with alodine, epoxy primer and polyurethane enamel

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 3 of 14 09 May 2013 NB - aircraft is lifted on jacks and landing gear is retracted - clearance between fasteners/frame and MLG stabilizer brace in the reworked areas is measured - Bombardier Technical Help Desk is contacted if clearance is not within limits - LH and RH A-Frame assemblies are re-identified and coated if clearance is within limits - landing gear is extended, aircraft is lowered and jacks are removed - close out. D. Compliance Bombardier Inc. highly recommends that ModSum ModSum 4-113774 be incorporated at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. A Transport Canada Airworthiness Directive is 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. F. Manpower It will take an estimated 3 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 0.50 Procedure 2.00 Test / RTS 0.00 Close-Out 0.50

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 4 of 14 09 May 2013 NB 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 ModKit 8DK4199-001 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
Kit Number Description 8DK4199-001 Drawing Kit - Nacelle, A-Frame, Fasteners The part(s) and material(s) detailed in Paragraph(s) 2.A. and 2.B. 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. DK parts are to be manufactured and approved locally (refer to disclaimer in the related text or illustration). In some cases, an equivalent to the DK part may be available from Bombardier under the production part number shown as reference in Parts Required Per Aircraft.

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 5 of 14 09 May 2013 NB 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

8DK4199 1
--

8Z9565 1
-- ModSum 4Q113774 Rev. ‘C’ ModSum 4-113774 Rev. ‘C’ ModSum 4-113159 Rev. ‘B’ ModSum IS4Q5450002 Rev. ‘B’ ModSum IS4Q5400016 Rev. ‘A’ PCA 44059 Revision 1 (for internal reference only) Transport Canada Airworthiness Directive Pending. 2. MATERIALINFORMATION A. Parts Required Per Aircraft (1) Drawing Kit 8DK4199-001

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 6 of 14 09 May 2013 NB (2) Detailed Kit Content:

Quantity Per Kit -001 Part Number Description Remarks
8 HST1070CY-5 Collar, Shear See NOTE 2 8 B0206002AG5-5 Pin, Shear, Csk See NOTE 2

- 8Z9565 Retrofit Drawing Drawing Only

- 8DK4199 Kit Drawing Only NOTE 1: This service bulletin is self-contained (illustrated ). No drawings will be provided. NOTE 2: These items are required to install the kit. These items are not included in the kit and must be supplied by the operator. (3) In addition to the above part(s), the following material(s) are 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 (CPM) Manual PSM 1-84-18.
Product ID No. Qty. Per Aircraft Description Specifications 07-02 1/4 Pint Primer, Chromated Epoxy DHMS C4.01 or MIL-PRF-23377 07-08 1/4 Pint Coating, Polyurethane Enamel (F24) MIL-PRF-85285 DHMS C4.04 Type 4 07-21 1/2 Ounce Coating, Chemical Conversion MIL-C-5541
NOTE: Refer to CPM PSM 1-84-18 for the list of approved consumable products under each Product ID No., any of which can be used unless a note states otherwise.

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 7 of 14 09 May 2013 NB An epoxy primer conforming to DHMS C4.01 is available from: Tempo Aerospace Inc. 205 Fenmar Drive Weston, Ontario M9L 2X4 Canada Telephone: 416 746 2233 Fax: (416) 746-2235 Email: sales@tempo-aerospace.com Website URL: http://www.tempo-aerospace.com 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 8Z8527-001 A-Frame (LH) 1 A RWK 8Z9565-001 R 8Z8527-002 A-Frame (RH) 1 A RWK 8Z9565-002 R 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.

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 8 of 14 09 May 2013 NB DC Disposition DIS Discard 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. PNC Part Number Code N No equivalent Bombardier Inc. part number for reworked part. Indicate on part that this service bulletin has been accomplished. R Part number after rework. S Superseding or equivalent part number. X Reworked part and superseding part are functionally and physically equivalent but not identical. 3. ACCOMPLISHMENTINSTRUCTIONS
NOTE: If ModSum IS4Q5450002 was previously accomplished, no action is required. A. Job Set-Up (1) Make sure the nose gear ground lock is engaged. (2) Make sure that lock pins are installed through each main gear and main gear door mechanism. (3) Set wheel chocks in front and behind the landing gear tires. (4) Deplete hydraulic pressure in the No. 1, 2 & 3 systems (refer to AMM TASKs 29-00-00-863-802 and 29-00-00-863-804). (5) Install a warning sign on the external hydraulic connection. (6) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS (refer to AMM TASKs 24-00-00-861-802 and 24-00-00-910-801).

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 9 of 14 09 May 2013 NB (7) Set up work platforms or ladders as required to gain access to the stabilizer brace in the No.1 and/or No.2 wheel well. Make sure that the work platforms or ladders are electrically grounded. B. Procedure (1) Rework the LH and RH A-Frames as follows (refer to Figure 1): NOTE: If ModSum IS4Q5400016 was previously accomplished, the rework that follows is applicable. (a) Remove existing Hi-Lite fasteners (refer to Figure 1). (b) Countersink holes on aft face. (c) Clean, deburr and treat exposed surfaces with Alodine (Product ID No. 07-21) and then apply epoxy primer (Product ID No. 07-02) and polyurethane enamel (Product Id No. 07-08) on all applicable rework areas (refer to CPM PSM 1-84-18 and to applicable instructions in AMM TASKs 51-25-16-390-801, 51-25-26-370-801 and 51-25-31-370-801). (d) Install new Hi-Lite fasteners with collar on forward side of A-Frame (refer to applicable instructions in SRM 51-40-15). (e) Measure the clearance between the fasteners/frame and MLG stabilizer brace assembly in the reworked area as follows: 1 Lift the aircraft on jacks (refer to applicable instructions in AMM Task 07-10-00-582-801). 2 Retract the landing gear (refer to applicable instructions in AMM Task 32-31-00-867-801). 3 With the MLG in retracted position, measure the clearance between the fasteners/frame and MLG stabilizer brace assembly in the reworked areas as shown in Figure 2 per flagnote 2 in VIEW A and SECTION E-E. (f) If the minimum clearance is less than 0.100 in. (2.54 mm), before further flight, contact the Q Series Technical Help Desk by telephone at 416-375-4000 or email at: thd.qseries@aero.bombardier.com for approved disposition/action.

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 10 of 14 09 May 2013 NB (g) If the clearance is equal or more than 0.100 in. (2.54 mm), re-identify the LH A-Frame as 8Z9565-001 and RH A-Frame as 8Z9565-002. After the identification markings have dried, apply a clear coat (no color) of polyurethane enamel (Product ID No. 07-08) (refer to CPM PSM 1-84-18 and to applicable instructions in AMM TASK 51-25-31-370-801). (h) Extend the landing gear (refer to applicable instructions in AMM Task 32-31-00-867-801). Make sure no fouling condition exists during gear extension. If fouling condition exists, contact Technical Help Desk by telephone at 416-375-4000 or email at: thd.qseries@aero.bombardier.com for approved disposition/action. (i) Lower the aircraft on jacks and remove the jacks (refer to applicable instructions in AMM Task 07-10-00-582-801). 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 84-54-21

S.B. 84-54-21 Page 11 of 14 09 May 2013 NB Rework - Nacelle A-Frame Figure 1 (Sheet 1) AREA OF REWORK

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 12 of 14 09 May 2013 NB Rework - Nacelle A-Frame Figure 1 (Sheet 2) 1 1

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 13 of 14 09 May 2013 NB Nacelle A-Frame and MLG Stabilizer Brace - Clearance Measurement Figure 2 (Sheet 1) WITH THE MAIN LANDING GEAR RETRACTED, MEASURE THE CLEARANCE BETWEEN THE FASTENERS/FRAME AND MLG STABILIZER BRACE. A-FRAME STABILIZER BRACE



## A 2 2

2 2

### SERVICE BULLETIN 84-54-21

S.B. 84-54-21 Page 14 of 14 09 May 2013 NB STABILIZER BRACE

STABILIZER BRACE

WITH THE MAIN LANDING GEAR RETRACTED, MEASURE THE CLEARANCE BETWEEN THE FASTENERS/FRAME AND MLG STABILIZER BRACE. Nacelle A-Frame and MLG Stabilizer Brace - Clearance Measurement Figure 2 (Sheet 2) (MLG STABILIZER BRACE P/N 46400-27 AND SUBS)

MEASURE CLEARANCE, MUST BE 0.100 IN (2.54 MM) OR GREATER.

MEASURE CLEARANCE, MUST BE 0.100 IN (2.54 MM) OR GREATER. (MLG STABILIZER BRACE P/N 46400-25 AND PREV)

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