Revision ‘A’ 25 Jan 2012

DHC-8 (DASH 8)

SERVICE BULLETIN 84-26-11

Fire Protection - Aft Nacelle Bracket Modification to Prevent Fire

Detection Wire Chafing - ModSum 4-113717

This page transmits Revision ‘A’ of Service Bulletin 84-26-11, pages 1 thru

16, dated: 25 Jan 2012.

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

- the Material - Price and Availability section is revised to show correct kit

number

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

bulletin and engineering documentation

- the MATERIAL INFORMATION section is revised to show correct kit

number

The Compliance in the previous issue of this service bulletin is not affected

by this revision. No additional rework to the aircraft is introduced by this

revision.

Remove previous issue of Service Bulletin 84-26-11 and replace with

attached.

Previous issues of Service Bulletin 84-26-11:

Initial issue - Pages 1 thru 16 dated 19 Dec 2011

D

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2611 NUMBER: 84-26-11

SUBJECT: Fire Protection - Aft Nacelle Bracket Modification to Prevent Fire

Detection Wire Chafing - ModSum 4-113717

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

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

4003, 4004, 4006, 4008 thru 4382.

Production: ModSum 4-113717 will be installed before delivery on

applicable DHC-8 Aircraft at Serial Number 4383 thru 4429.

Production: Equivalent Production ModSum 4-170047 will be installed

before delivery on applicable DHC-8 Aircraft at Serial Number

4430 and subsequent.

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
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B. Reason

Problem: It has been discovered that chafing between the main landing gear yoke

assembly and the fire detection wire can occur.

Solution: This service bulletin provides instructions to install a new bracket and

secure the fire detection wire in the aft nacelle.

C. Description

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

follow:

- aircraft is put into standard configuration for maintenance

- aircraft electrical power is removed

- the nose landing gear lock is engaged

- the main landing gear lock pins are installed thru each main gear and main gear

door mechanism

- safety stands are placed around the main landing gear

- main landing gear (MLG) yoke and the fire detection wires are inspected for

chafing and damages

- existing bracket supporting fire detection wire is removed

- new brackets are installed

- close out.

D. Compliance

Bombardier Inc. recommends incorporation of ModSum 4-113717 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).
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F. Manpower

It will take an estimated 3.00 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 0.25

Procedure 2.00

Test / RTS 0.50

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

ModKit 8MK4581-003 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

8MK4581-003 Mod Kit, Nacelle-Structures

Provisions-Fire Detection Sys

H. Tooling - Price and Availability

None
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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

8MK4581 1 A

8Z9351 1 C

ModSum 4Q113717 Rev. ‘H’

ModSum 4-113717 Rev. ‘H’

Service Letter DH8-400-SL-32-030

PCA 43636 Revision 0 (for internal reference only)

Transport Canada Airworthiness Directive pending

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Modification Kit 8MK4581-003

(2) Detailed Kit Content:

Quantity Per Kit

-003

Part Number Description Remarks

12 B0205016AD4-3S Rivet

2 82624229-104 Bracket

4 B0205016AD4-4S Rivet

4 208236 Clamp, Hinged

4 324351 Grommet

2 82624229-103 Bracket
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B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None

D. Existing Parts Accountability

None

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) Set up the work platforms or ladders as required to gain access to the LH & RH

nacelle inboard and outboard panels. Make sure the work platforms or ladders

are electrically grounded.

B. Procedure

(1) Do a detailed visual inspection of the fire detector wire. If there is any damage

noted on detector wire at location shown in Figure 7, discard the detector and

replace with new detector.

(2) Do a detailed visual inspection of the MLG yoke in the location shown in Figure

7. If chafing on MLG yoke with limitation as shown in Figure 8 is found, do the

necessary repair per Figure 9. If limitation of chafing as shown in Figure 8

Section A-A is exceeded, contact Q Series Help Desk

(thd.qseries@aero.bombardier.com) for further instructions.

(3) Carefully remove fire detection wire from existing bracket supporting the fire

detection wire on the LH and RH outboard and inboard nacelle panels. Refer to

Figures 1, 2 & 4.

(4) On the LH nacelle outboard panel and RH nacelle inboard panel, locate bracket

82624211 as shown in Figure 3, remove two existing rivets and install bracket

82624229-103 to same hole location using rivets B0205016AD4-4S.
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(5) On the LH nacelle inboard panel and RH nacelle outboard panel, install bracket

82624229-104 using rivets B0205016AD4-3S as per dimensions shown in Figure

5.

(6) Install new hinged clamp 208236 to new brackets 82624229-103 &

82624229-104 using rivets B0205016AD4-3S. Refer to Figures 3 & 5.

(7) Install new grommet 324351 to fire detection wire. Refer to Figure 3 & 5.

(8) Carefully install fire detection wire to new bracket assembly. Refer to Figure 3 &

5.

NOTE: Make sure fire detection wire routing maintains a minimum bend radius of

R1.00 inches.

(9) Do an operational test of the nacelle fire detection system. Refer to Maintenance

Manual Task 26-11-00-710-801.

(10) Do an operational test of the landing gear primary extension and retraction

system to make sure clearance is maintained between the gear and detection

wire. Refer to Maintenance Manual Task 32-31-00-710-801.

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.
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Work Location

Figure 1

FIRE DETECTION SYSTEM

LH NACELLE

FIRE DETECTION SYSTEM

RH NACELLE
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Nacelle Panel

Figure 2
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Nacelle Panel

Figure 3

RIVET

B0205016AD4-3S

RIVET

B0205016AD4-4S

GROMMET

324351

BRACKET

82624229-103

CLAMP, HINGED

208236
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Nacelle Panel

Figure 4
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Nacelle Panel

Figure 5

ALL DIMENSIONS ARE GIVEN IN INCHES

RIVET

B0205016AD4-3S

RIVET

B0205016AD4-3S

GROMMET

324351

BRACKET

82624229-104

CLAMP, HINGED

208236

0.490

0.620

0.620

1.26
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Nacelle Panel

Figure 6

CLAMP, HINGED

208236

GROMMET

324351

BRACKET

82624229-103

ALL DIMENSIONS ARE GIVEN IN INCHES
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Nacelle Fire Detection Wire Contact Locations on MLG Yoke

Figure 7

FIRE DETECTION WIREINSPECTION AREA

FIRE DETECTION WIREINSPECTION AREA

YOKEINSPECTION AREA

YOKEINSPECTION AREA

View looking aft within nacelle with MLG extended
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Typical four locations, inboard/outboard yoke legs, port and starboard nacelles

Figure 8

1
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Figure 9
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This Page Intentionally Blank

2
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