D

S.B. 84-54-21

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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

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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
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- 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

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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.
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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. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Drawing Kit 8DK4199-001
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(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

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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

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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. ACCOMPLISHMENT INSTRUCTIONS

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

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(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

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(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

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Rework - Nacelle A-Frame

Figure 1 (Sheet 1)

AREA OF REWORK
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Rework - Nacelle A-Frame

Figure 1 (Sheet 2)

1

1
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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
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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)

1
Jan 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.com
Feb 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