Revision ‘A’ 22 Mar 2011

DHC ---8 (DASH 8)

SERVICE BULLETIN 84 ---27 ---21

Flight Controls --- Rudder and Brake Control --- Replacement of Rudder

Control and Brake Control Pushrod Assemblies to Substitute T4

Pushrod with T6 --- ModSum 4 ---113455

This page transmits Revision ‘A’ of Service Bulletin 8 ---27 ---21, pages 1 thru 10

dated 22 Mar 2011.

This service bulletin is re ---issued for the reasons that follow:

The requirement to do a “straightness inspection” of existing brake rudder control

pushrods p/n 82710274 ---001 per the initial issue of this service bulletin is no

longer applicable and has been deleted. The existing brake rudder control

pushrods p/n 82710274 ---001 are simply replaced with new pushrods p/n

82710274 ---951.

--- the Description part of the PLANNING INFORMATION section and the

Procedure part of the ACCOMPLISHMENT INSTRUCTIONS are revised

accordingly per above para

--- the Compliance section is revised to include the following:

“A Transport Canada Airworthiness Directive is pending”

--- the References section is revised to convey the latest revision of this service

bulletin

Compliance:

Aircraft that are in compliance with the initial issue of this service bulletin and

have installed brake rudder pushrods p/n 82710274 ---951 are unaffected by

this revision.

Aircraft without brake rudder pushrods p/n 82710274 ---951 are affected.

Rework is required. Bombardier Aerospace highly recommends

replacement of all affected pushrods p/n 82710274 ---001 with pushrods p/n

82710274 ---951 at the operators earliest opportunity.

Remove the initial issue of Service Bulletin 84 ---27 ---21 and replace with attached.

Previous issue(s) of Service Bulletin 84 ---27 ---21:

Initial issue --- Pages 1 thru 10 dated 10 Oct 2008

D

S.B. 84 ---27 ---21

Page 1 of 10

10 Oct 2008

LS Revision ’A’, 22 Mar 2011

SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2720 NUMBER: 84 ---27 ---21

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Flight Controls --- Rudder and Brake Control --- Replacement of

Rudder Control and Brake Control Pushrod Assemblies to Substitute

T4 Pushrod with T6 --- ModSum 4 ---113455

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001,

4003 thru 4006, 4008 thru 4072.

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:

The following is a list of spares affected by this change. Review spares and

procurement systems to determine the existence of any listed parts. See

Paragraph 2.D., Existing Parts Accountability, for disposition.
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10 Oct 2008

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Part Number Description Remarks

82710274 ---001 Pushrod --- Brake,

Rudder Pedal

Manufactured after April

1998

82710028 ---003 Pushrod --- Rudder

Control

Manufactured after

February 1997

B. Reason

Problem: Some pushrods may have been incorrectly manufactured with tubes

having the wrong heat treat condition using 6061 ---T4 instead of

6061 ---T6.

C. Description

The procedures in this service bulletin give the instructions to do the tasks that

follow:

--- four rudder control pushrods and two brake control pushrods are replaced

--- removed pushrods are destroyed and discarded

--- new brake and rudder control pushrods are installed and rigged

--- a functional test of the brake control system and rudder control system is

performed

--- close ---out

D. Compliance

Bombardier Aerospace highly recommends that this modification be incorporated

at the operators earliest opportunity, unless otherwise directed by their

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.
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10 Oct 2008

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F. Manpower

It will take an estimated 10 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 0.00

Procedure 9.00

Test / RTS 1.00

Close ---Out 0.00

G. Material --- Price and Availability

ModKit 8MK4277 ---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 Price (US$) Delivery

8MK4277 ---001 Retrofit Kit ---Control

Rod Assembly

Replacement ---

Rudder Control

Quoted at

time of order

Will be given at

time of order
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10 Oct 2008

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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

Revision ‘A’ of this service bulletin was prepared to the engineering drawings and

related data that follows:

DRAWING SHEET REV

8MK4277 1 --- ---

ModSum 4Q113455 Rev. ‘B’

ModSum 4 ---113455 Rev. ‘B’

PCA 40535 Revision --- --- (for internal reference only)

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Modification Kit 8MK4277 ---001

(2) Detailed Kit Content:
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10 Oct 2008

LS Revision ’A’, 22 Mar 2011

Quantity Per Kit

---001

Part Number Description Remarks

4 82710028 ---951 Rudder Pushrod

2 82710274 ---951 Brake Pushrod

4 AN960D10L Washer

4 AN960D416 Washer

4 AN960D416L Washer

4 MS24665 ---88 Cotter Pin

8 MS24665 ---153 Cotter Pin

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

82710028 ---003 Rudder Pushrod 4 B DIS 82710028 ---951 S

82710274 ---001 Brake Pushrod 2 B DIS 82710274 ---951 S

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

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.
SERVICE BULLETIN 84 ---27 ---21

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10 Oct 2008

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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

A. Job Set ---Up

(1) Either pull and clip circuit breakers required to isolate affected circuits or placard

and select aircraft electrical power to OFF. Obey all relevant WARNINGS and

CAUTIONS detailed in Maintenance Manual PSM 1 ---84 ---2.

(2) Remove and retain the following access panels 121AL, 121BL, 122AR and

122BR (refer to PSM 1 ---84 ---2 Chapter 6).

B. Procedure

Rudder Control Pushrod Replacement

NOTE: Replace one pushrod at a time.

(1) Remove and discard four pushrods 82710028 ---003 from the rudder pedal

adjustment assembly on the pilots and co ---pilots side as follows:

(a) From the pedal adjustment lever disconnect one side of the pushrod by

removing one cotter pin MS24665 ---153, one nut MS14144L4, one washer

AN960D416L, one bolt NAS6604D14 and one bushing NAS75 ---4 ---006.

Keep all hardware except for washer and cotter pin (refer to Figure 3).

(b) From the rudder pedal tube assembly disconnect the other side of the

pushrod by removing one cotter pin MS24665 ---153, one nut MS14144L4,

one bolt NAS6604D18, one washer AN960D416 and one bushing

NAS75 ---4 ---008. Keep all hardware except for washer and cotter pin (refer

to Figure 3).

(2) After removing each defective Pushrod (P/N 82710028 ---003) cut each part into

two pieces in a way that will render them UNSERVICEABLE, wire lock the two

pieces together. Tag the parts and dispose them as instructed by your Local

Airworthiness Authority.
SERVICE BULLETIN 84 ---27 ---21

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10 Oct 2008

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(3) Install four new pushrods 82710028 ---951 to rudder pedal adjustment assembly

on the pilots and co ---pilots side as follows:

(a) Install one end of pushrod to the pedal adjustment lever using one new

cotter pin MS24665 ---153, one nut MS14144L4, one new washer

AN960D416L, one bolt NAS6604D14 and one bushing NAS75 ---4 ---006

(refer to Figure 3).

(b) Install the other end of pushrod to the rudder pedal tube assembly using

one new cotter pin MS24665 ---153, one nut MS14144L4, one bolt

NAS6604D18, one new washer AN960D416 and one bushing

NAS75 ---4 ---008 (refer to Figure 3).

(4) Rig new pushrods 82710028 ---951 per Maintenance Manual PSM 1 ---84 ---2 Task

27 ---21 ---00 ---830 ---810.

Brake Rudder Control Pushrod Replacement

(1) Gain access to the brake, rudder control pushrods below the flight compartment

floor on the pilots side.

(2) Deleted

(3) Replace two pushrods 82710274 ---001 from the brake, rudder control assembly

on the pilots side as follows:

(a) Disconnect both ends of the pushrod by removing two cotter pins

MS24665 ---88, two nuts MS14144L3, two washers AN960D10L and two

bolts NAS6603D7. Keep all hardware except for washers and cotter pins

(refer to Figure 3).

(b) After removing each defective Pushrod (P/N 82710274 ---001) cut each part

into two pieces in a way that will render them UNSERVICEABLE, wire lock

the two pieces together. Tag the parts and dispose them as instructed by

your Local Airworthiness Authority.

(c) Install new pushrod 82710274 ---951 using two new cotter pins

MS24665 ---88, two nuts MS14144L3, two new washers AN960D10L and

two bolts NAS6603D7 (refer to Figure 3).

(4) Rig the Main Brake Control Cables per Maintenance Manual PSM 1 ---84 ---2 Task

32 ---42 ---00 ---830 ---801.

C. Close Out

(1) Remove all tools and equipment from the work area.

(2) Perform an operational check of the Rudder Control System per Maintenance

Manual PSM 1 ---84 ---2 Task 27 ---20 ---00 ---710 ---803.
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(3) Perform a functional test of the Main Landing Gear Brake System per

Maintenance Manual PSM 1 ---84 ---2 Task 32 ---42 ---00 ---720 ---801.

(4) Install access panels 121AL, 121BL, 122AR and 122BR (refer to PSM 1 ---84 ---2

Chapter 6).

(5) 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.

Figure 1

VIEW DELETED
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Figure 2
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View Looking Inboard on LH Side (RH Side Similar)

Figure 3

COTTER PIN

MS24665 ---153

4 REQUIRED

WASHER

AN960D416

4 REQUIRED

COTTER PIN

MS24665 ---88

4 REQUIRED

WASHER

AN960D10L

4 REQUIRED

(BOLT MS14144L3)

(NUT NAS6603D7)

PUSHROD ---RUDDER

82710028 ---951

4 REQUIRED

PUSHROD ---BRAKE

82710274 ---951

2 REQUIRED

COTTER PIN

MS24665 ---153

4 REQUIRED

WASHER

AN960D416L

4 REQUIRED

1
Jan 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.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