D

S.B. 84 ---30 ---14

Page 1 of 18

20 May 2011

LS

SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 3011 NUMBER: 84 ---30 ---14

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Ice & Rain Protection --- Installation of Timer Monitor Unit P/N

4100S018 ---07 --- ModSum 4 ---126525

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

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

4003 ---4004, 4006, 4008 ---4375 with a AERAZUR Timer and

Monitor Unit (TMU) p/n 4100S018 ---06 installed.

Production: ModSum 4 ---126525 will be installed before delivery on

applicable DHC ---8 Aircraft at Serial Number 4376 and

subsequent.
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 2 of 18

20 May 2011

LS

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.

Part Number Description

4100S018 ---06 AERAZUR Timer and Monitor Unit

B. Reason

Problem: Multiple in service incidents such as air turn backs and aborted take ---offs

have occurred due to the poor reliability of existing Timer Monitor Unit p/n

4100S018 ---06. Failure of the TMU could cause the AUTO deicing mode

to become unavailable.

Cause: An investigation by the vendor of the TMU has determined that some

tantalum capacitors installed in the Module 300 power supply may leak if

overstressed. If leakage occurs at any tantalum capacitors site the

adjacent PCB insulation weakens. As a result a short ---circuit between

GND and the Dual Distributing Valve may occur.

Solution: This service bulletin introduces ModSum 4 ---126525.

The ModSum replaces the existing TMU p/n 4100S018 ---06 with TMU p/n

4100S018 ---07.

The new TMU is redesigned to minimize some of the issues inherent to

some of the earlier TMU’s p/n 4100S018 ---06. For additional information

refer to the enclosed vendor service bulletin (VSB) AERAZUR

4100S018 ---30 ---001 para 1. PLANNING INFORMATION, D. Description,

subpara (3).
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 3 of 18

20 May 2011

LS

C. Description

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

follow:

--- the aircraft electrical system is de ---energized

--- lock pins are installed thru each main gear and main gear door mechanism

--- the nose gear ground lock is engaged

--- the lower wardrobe outboard access panel is removed

--- existing TMU p/n 4100S018 ---06 is located and removed to agree with AMM

procedures

--- new TMU p/n 4100S018 ---07 is installed and tested to agree with AMM procedures

--- the lower wardrobe outboard access panel is installed

--- Close ---Out.

D. Compliance

Bombardier Inc. recommends incorporation of ModSum 4 ---126525 at the earliest

opportunity unless otherwise directed by the operator’s airworthiness authority.

An Airworthiness Directive to be issued by Transport Canada 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.

This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage

Tolerance Inspections (DTIs).

F. Manpower

It will take an estimated 1.5 man ---hours to complete this service bulletin. The

breakdown of the man ---hours is shown in the table that follows:
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 4 of 18

20 May 2011

LS

TASK MAN ---HOURS

Job Set ---Up 0.25

Procedure 1.00

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

G. Material --- Price and Availability

Refer to enclosed AERAZUR VSB 4100S018 ---30 ---001 para 2. MATERIAL

INFORMATION section.

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:

ModSum 4 --- 126525 Rev. ‘B’

ModSum 4Q126525 Rev. ‘B’
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 5 of 18

20 May 2011

LS

AERAZUR VSB 4100S018 ---30 ---001 Issue 0

PCA 43360 Revision 2 (for internal reference only)

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

Refer to applicable information in enclosed AERAZUR VSB 4100S018 ---30 ---001

para 2. MATERIAL INFORMATION section.

B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None

D. Existing Parts Accountability

Refer to applicable information in enclosed AERAZUR VSB 4100S018 ---30 ---001

para 2. MATERIAL INFORMATION section.
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 6 of 18

20 May 2011

LS

3. ACCOMPLISHMENT INSTRUCTIONS

A. Job Set ---Up

(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 thru each main gear and main gear door

mechanism.

(3) Make sure the nose gear ground lock is engaged.

(4) Gain access to the TMU located behind the wardrobe enclosure.

B. Procedure

(1) Remove existing TMU p/n 4100S018 ---06 (refer to AMM TASK

30 ---11 ---01 ---000 ---801).

(2) Install new TMU p/n 4100S018 ---07 and do applicable return to service checks

(refer to AMM TASK 30 ---11 ---01 ---400 ---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 ---30 ---14

S.B. 84 ---30 ---14

Page 7 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 8 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 9 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 10 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 11 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 12 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 13 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 14 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 15 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 16 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 17 of 18

20 May 2011

LS
SERVICE BULLETIN 84 ---30 ---14

S.B. 84 ---30 ---14

Page 18 of 18

20 May 2011

LS

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