# Bombardier Service Bulletin 84-28-29

Copy: No revision named ("84-28-29"), 18 pages: PDF https://openairdocs.org/files/sha256/56/ca/56caa77d2f91ce9cbd4d8437e86cb181b5b76020283da33a6ada2655a1781aca; text https://openairdocs.org/service-documents/bombardier/sb-84-28-29/file/56caa77d2f91.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2022-1151; AD 2023-01-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md)
- Type: Service bulletin (Service Bulletin)
- Number: 84-28-29
- Page: https://openairdocs.org/service-documents/bombardier/sb-84-28-29

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2023-01-09](https://openairdocs.org/ad/2023-01-09.md), effective Mar 13, 2023: No revision named

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-84-28-29/proposed.md).

## Text (18 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2022-1151; AD 2023-01-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

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SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 2811 NUMBER: 84- - -28- - -29
BOMBARDIER AEROSPACE CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGE OPERATORS TO PROMPTL Y EVALUATE THE CONTENTS
SUBJECT : Fuel - - - Rib Assembly and Installation - - - Inspection/Removal of
Bonding Jumpers and Brackets - - - ModSum 4- - - 113998
1. PLANNING INFORMA TION
A. Effectivity
Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 401 and 402 Serial Numbers 4001 and
4003 thru 4118.
Related ModSum Title
4D126336 Fuel System - - - Fuel T ank Mechanical Design, SFAR
88 Compliance
4Q126330 F u e l S y s t e m --- R e t r o f i t --- F u e l Ta n k M e c h a n i c a l
Design, SFAR 88 Compliance
4Q113996 Fuel - - - Center WIng - - - Rib Assembly and Installa-
tion - - - Removal of Bonding Jumper Brackets

### Page 2

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Related ModSum Title
4Q113999 Fuel - - - Wing - - - Inspection/Removal of Bonding
Jumpers and Brackets
4Q113970 Fuel System - - -( Retrofit Only) - - - Introduction of
High Resistance Isolators, Flexible ANodized and
Threaded Rigid Couplings and Bracket Supports
for Fuel Pipes to Address Wear and Corrosion
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
B. Reason
Problem: Bonding jumpers may have been incorrectly installed on the fuel lines that
follow:
- - - inboard vent line at wing stations ±173.20 and ±79.70
- - - outboard vent line at wing station ±299.019
- - - inboard scavenge line at wing stations ±136.30 and ±79.70
- - - outboard scavenge line at wing station ±299.019.
Solution: This service bulletin introduces ModSum 4- - -113998.
This service bulletin provides the instructions to inspect and remove as
necessary the bonding jumpers that may have been incorrectly installed.
It also provides the instructions to rework the affected wing rib installations
by either removing or reworking as applicable the affected brackets.

### Page 3

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C. Description
The procedures in this service bulletin give the instructions to do the tasks that follow:
- - - 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
- - - fuel tank is prepared for access
- - - access panels are opened
- - - an inspection for presence and correct installation of bonding jumpers on the fuel vent
lines at wing stations ±79.70, ±173.20 and ±299.019 and the scavenge lines at wing
stations ±79.70, ±136.30, ±299.019 is done
- - - applicable wing rib installation is reworked as necessary by removing affected
bonding jumpers and by removing or reworking affected brackets as applicable
- - - close out.
D. Compliance
Bombardier Inc. highly recommend incorporation of ModSum 4- - -113998 at the
earliest opportunity unless otherwise directed by the operator’s airworthiness
authority.
Transport Canada Airworthiness Directive 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
# 9 3 --- Q --- 0 2 .
This Service Bulletin does not affect Airworthiness Limitations (AWLs) and/or Damage
T olerance Inspections (DTIs).

### Page 4

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F. M a n p o w e r
It will take an estimated 134.00 man- - -hour s to complete this service bulletin. The
breakdown of the man- - -hours is shown in the table that follows:
TASK M A N --- H O U R S
J o b S e t --- U p 32.00
Procedure (Inspection) 30.00
Procedure (Rectification) 40.00
T e s t/R T S 00.00
Close- - -Out 32.00
This estimate is for direct labour done by an experienced crew and it does not
include, planning, familiarization, cure tim e, part fabrication, tool acquisition or lost
time.
G. Material - - - Price and Availability
Kit Number Description
8DK4356- - -001 Fuel System - - - Inspection/Removal of
Bonding Jumpers and Brackets
Drawing Kit(s) (DKs) listed in the table above are drawings only. No parts will be
supplied.
The part(s) and material(s) required are listed in Paragraph 2.A. The parts required
may be either furnished or fabricated from the operator’s existing stock, purchased as
single items from Bombardier Aerospace Commercial Aircraft or purchased directly
from industry sources. DK parts are to be manufactured and approved locally (refer to
disclaimer in the related text or illustra tion). 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.

### Page 5

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See the contact information below.
Bombardier Aerospace
Customer Accounts Services T eam (Mail Stop N11- - -32)
123 Garratt Blvd.
T oronto, Ontario
Canada M3K- - -1Y5
E- - -mail addresses:
International: cast.international@aero.bombardier.com
European: ps_emea@aero.bombardier.com
Americas East: cast.americaseast@aero.bombardier.com
Americas West: cast.americaswest@aero.bombardier.com
T elephone:
North America:T oll Free +1- - -844- - -CRC- - -CRC0 (+1- - -844- - -272- - -2720) or direct
+1- - -514- - -855- - -8500
Facsimile:
International: (416) 373- - -5966
Americas East: (416) 373- - -5964
Americas West: (416) 375- - -5965
If required the related 8DK drawings listed in the T able above can be requested by
writing to the e- - -mail address that follows:
qseriesdwgrequest@aero.bombardier.com
Follow the instructions per All Operator Messages (AOM) 389.
H. T ooling - - - Price and Availability
None

### Page 6 (OCR)

SERVICE BULLETIN 84-28-29
Weight and Balance
SUMMARY FOR SB 84-28-29 (4Q113998)
AC TYPE AND MODEL  DHC-8 MODEL 401 &  DHC-8 MODEL 402  INSPECTION  AREA  WING STA.  WEIGHT  (1b)  ARM  (in)  (in x Ib x 0.001)  MOMENT
BRACKET
REMOVALS/REWORK  ALL  ALL  -0.10  405.80  -0.04
ONLY
IF ANY BONDING JUMPERS WERE REMOVED, ALSO INCLUDE THE FOLLOWING WEIGHT IMPACT
FOR THE AFFECTED INSPECTION AREAS 1 - 5 SHOWN ON DRAWING 8DK4356.
1  -0.04  416.00  -0.02
‡136.30
2  $79.70  -0.04  414.37  -0.02
BONDING JUMPER
AND HARDWARE  REMOVALS  +173.20  -0.08  393.14  -0.03
4  +79.70  -0.06  391.38  -0.02
5  +299.019  -0.11  406.12  -0.05
EXAMPLE: IF BONDING JUMPERS ARE REMOVED FROM INSPECTION AREAS 1 & 5 (LH & RH)
TOTAL WEIGHT IMPACT = -0.10 b -0.04 -0.11 Ib = -0.25 Ib
J. Electrical Load Data
Not affected
K. Publications Affected
Aircraft Maintenance Manual ...  . PSM 1-84-2
Aircraft Illustrated Parts Catalog  PSM 1-84-4
Maintenance Requirement Manual  . PSM 1-84-7
ModSums Manual .....  . PSM 1-84-12
Weight and Balance Manual (Imperial)  . PSM 1-84-8
Weight and Balance Manual (Metric)  . PSM 1-84-8M
17 Oct 2018  S.B. 84-28-29
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L. References
The initial issue of this service bulletin was prepared to the engineering drawings and
related data that follows:
DRAWING SHEET REV
8DK4356 1 --- ---
8DK4356 2 --- ---
8DK4356 3 --- ---
8DK4356 4 --- ---
8DK4356 5 --- ---
8DK4356 6 --- ---
8DK4356 7 --- ---
8DK4356 8 --- ---
ModSum 4Q113998 Rev. ‘B’
ModSum 4- - -113998 Rev. ‘B’
PCA 46423 Revision 11 (for internal reference only)
Transport Canada Airworthiness Directive Pending
All Operator Message 389.
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft
(1) Drawing Kit 8DK4356- - -001
(2) Detailed Kit Content:

### Page 8

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Quantity Per Kit
--- 0 0 1
Part Number Description Remarks
10 B0205016AD5- - -5S Rivet, Solid T o 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 Commercial Aircraft or purchased directly from industry
sources.
Each consumable product listed in the table below is given its own unique
Product ID Number. The number is used to identify a particular recommended
product, the specifications and the trade names any of which can be used
unless specified otherwise (refer to PSM 1- - -84- - -18 Consumable Products
Manual).
Consumable
Product ID
Number
Qty. Per Aircraft Description Remarks
07- - -29A A/R C10 Alodine B o n d e r i t e M ---
CR1132 Pen
OR
B o n d e r i t e M ---
CR871 Pen
B. Parts Required to Modify Spares
None
C. Special T ools and Equipment Required
None
D. Existing Parts Accountability
None

### Page 9

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3. ACCOMPLISHMENT INSTRUCTIONS
If it is not possible to complete all the instructions of this service bulletin because of the
configuration of the aircraft, speak with a representative of Bombardier in the CRC at
1- - -844- - -272- - -2720 (1- - -844- - -CRC- - -CRC0) or email at thd.qseries@aero.bombardier.comfor
analysis and to get an approved disposition to complete this service bulletin.
A . J o b S e t --- U p
WARNING: MAKE SURE YOU INSTALL THE LOCKPINS ON THE MAIN LANDING
GEAR. MAKE SURE YOU ENGAGE THE NOSE GEAR LOCK. IF YOU
DO NOT DO THIS, THE LANDING GEAR CAN ACCIDENTALL Y
RETRACT . THIS CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO THE EQUIPMENT .
WARNING: MAKE SURE YOU INSTALL THE LOCKPINS IN THE DOOR
MECHANISMS OF THE MLG AND NLG. THE DOOR MECHANISMS
CAN ACCIDENTALL Y CLOSE THE LANDING GEAR DOORS. THIS
CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE
EQUIPMENT .
WARNING: OBEY ALL THE FUEL SAFETY PRECAUTIONS WHEN YOU DO
WORK ON THE FUEL SYSTEM AND/OR A FUEL SYSTEM
COMPONENT . IF YOU DO NOT YOU CAN CAUSE INJURIES TO
PERSONS AND/OR DAMAGE TO EQUIPMENT .
NOTE 1: Make sure highest standard of fit, form and function is maintained.
NOTE 2: When doing structural rework make sure to deburr affected rivet holes
then apply a layer of alodine and touch up with epoxy chromate primer
as required.
NOTE 3: Make sure to put a protective cover on any disconnected electrical
connector or any tube, hose, duct and/or line.

### Page 10

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(1) Placard and select all aircraft electrical power to OFF . Obey all relevant
W A R N I N G S a n d C A U T I O N S ( r e f e r t o A M M T A S K ’ S 2 4 --- 0 0 --- 0 0 --- 8 6 1 --- 8 0 2 a n d
24- - -00- - -00- - -910- - -801).
(2) Make sure that lock pins are installed through each main gear and main gear
door mechanism.
(3) Make sure the nose gear ground lock is engaged.
(4) Set wheel chocks in front and behind the landing gear tires.
(5) Defuel the aircraft (refer to AMM TASK 12- - -10- - -28- - -650- - -802).
( 6 ) M a k es u r et od e - - - e n e r g i z et h ea i r c r a f te l e c t r i c a ls y s t e m( r e f e rt oA M MT A S K
24- - -00- - -00- - -861- - -802).
(7) Set up work platforms or ladders around and/or under the left (and/or right) wing
to permit access to the fuel tanks. Make sure that the work platforms or ladders
are electrically grounded.
(8) Make sure to obey the fuel system safety precautions (refer to AMM TASK
28- - -00- - -00- - -910- - -801).
(9) Obey the electrical/electronic safety precautions (refer to AMM TASK
24- - -00- - -00- - -910- - -801).
(10) Obey the electrostatic discharge safety precautions (refer to AMM TASK
24- - -00- - -00- - -910- - -802).
(11) Prepare the left and right wing fuel tanks for access (refer to AMM TASK
28- - -10- - -00- - -840- - -801).
CAUTION: DRAIN THE FUEL TANK BEFORE YOU REMOVE THE ACCESS
PANELS. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE TO
THE WING STRUCTURE.

### Page 11

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(12) Remove the left and/or right wing panels that follow:
ACCESS DESIGNATION
522AT (and/or 622AT right wing) Wet Bay Fuel Access Panels
522BT (and/or 622BT right wing) Wet Bay Fuel Access Panels
522CT (and/or 622CT right wing) Wet Bay Fuel Access Panels
523AT (and/or 623AT right wing) Center Wing Fuel Access Panels
524AT (and/or 624AT right wing) Outer Wing Fuel Access Panels
524CT (and/or 624CT right wing) Outer Wing Fuel Access Panels
524DT (and/or 624DT right wing) Outer Wing Fuel Access Panels
(a) For removal of the wet bay and center fuel access panels, refer to AMM TASK
57- - -11- - -01- - -000- - -801.
(b) For removal of the outer wing fuel access panels, refer to AMM TASK
57- - -21- - -01- - -000- - -801.
(13) Use only cotton cloth or a natural sponge to soak up the remaining fuel.
(14) Remove the fuel fumes (refer to AMM TASK 28- - -10- - -00- - -840- - -802).
WARNING: FUEL PLUMBING SYSTEMS ARE DESIGNED WITH ELECTRICAL
BONDING FEATURES INCLUDING BONDING JUMPERS. SELF
BONDING COUPLINGS, CONDUCTIVE FITTINGS AND COMPONENTS
WITH CONDUCTIVE INTERFACES. THESE DESIGN FEATURES ARE
CLASSIFIED AS CRITICAL DESIGN CONFIGURATION CONTROL
LIMITATION (CDCCL) ITEMS. THE INTEGRITY OF THESE CRITICAL
DESIGN FEATURES MUST BE MAINTAINED TO ENSURE THAT
UNSAFE CONDITIONS DO NOT DEVELOP THROUGH MAINTENANCE.
B. Procedure
CAUTION: CARE SHOULD BE TAKEN WHEN WORKING INSIDE THE FUEL
TANK TO PREVENT UNNECESSARY DAMAGE TO THE TUBE
ASSEMBL Y AND SURROUNDING STRUCTURE.

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(1) Do the inspection/rework of the inboard fuel scavenge and motive system
82822012- - -001/- - -002 and inboard fuel vent system 82822016- - -001/- - -002 and
outboard fuel scavenge and vent system 82822250- - -001/- - -002 per the
instructions given below.
SHEET 2.
(REFER TO DRAWING 8DK4356)
(REFER TO DRAWING 8DK4356 SHEET 2)
(REFER TO DRAWING 8DK4356 SHEET 2)

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(REFER TO DRAWING 8DK4356 SHEET 3)
(CONT’D)
B0205016AD5- - -5S
B0205016AD5- - -5S
(REFER TO DRAWING 8DK4356 SHEET 5)
(REFER TO DRAWING 8DK4356 SHEET 7)

### Page 14

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(REFER TO DRAWING 8DK4356 SHEET 3)
(REFER TO DRAWING 8DK4356 SHEET 8)
(REFER TO DRAWING 8DK4356 SHEET 6)
B0205016AD5- - -5S
B0205016AD5- - -5S
(CONT’D)

### Page 15

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(REFER TO DRAWING 8DK4356)
(REFER TO DRAWING 8DK4356 SHEET 4)
C. Close Out
(1) Install the applicable access fuel panels that were removed (refer to AMM TASK
57- - -11- - -01- - -400- - -801 and/or AMM TASK 57- - -21- - -01- - -400- - -801).
(2) Pressure refuel the aircraft as necessary (refer to AMM TASK
12- - -10- - -28- - -650- - -801.
(3) Remove all tools and equipment from the work area.
(4) On incorporation of this ModSum, add the weight and balance data shown in
Section 1.I of this service bulletin to the Weight and Balance Manual PSM
1 --- 8 4 --- 8 ( I m p e r i a l ) o r 1 --- 8 4 --- 8 M ( M e t r i c ) a s a p p l i c a b l e . U n d e r ‘ D e s c r i p t i o n o f
Change’ enter “ModSum 4- - -113998 incorporated.”

### Page 16

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(5) On incorporation of this ModSum make an entry that conforms to local regulatory
requirements in the applicable logbook(s). If only part of this ModSum is
completed, use only this service bulleti n number as reference and detail exact
limit of work completed. Enter component serial numbers if applicable. Enter this
ModSum number only after complete and functional incorporation of all work
defined in this service bulletin.
NOTE: Following the incorporation of this ModSum, relevant maintenance
tasks that follow will be updated and must be used for all future
reference to the Instructions for Continued Airworthiness. The T asks will
be available as TRs or subsequent Revisions post - - -publish of Revision
63 of the Dash 8 Series 400 AMM, PSM 1- - -84- - -2, dated 5 Oct 2018.
AMM T ask Number Description
2 8 --- 1 1 --- 1 6 --- 0 0 0 --- 8 0 1Removal of the Scavenge Flow Lines
2 8 --- 1 1 --- 1 6 --- 4 0 0 --- 8 0 1Installation of the Scavenge Flow Lines
2 8 --- 1 2 --- 0 1 --- 0 0 0 --- 8 0 1R e m o v a lo ft h eI n b o a r dV e n tL i n e
2 8 --- 1 2 --- 0 1 --- 4 0 0 --- 8 0 1Installation of the Inboard Vent Line
2 8 --- 1 2 --- 0 6 --- 0 0 0 --- 8 0 1Removal of the Outboard Vent Line
2 8 --- 1 2 --- 0 6 --- 4 0 0 --- 8 0 1Installation of the Outboard Vent Line
THE DESIGN OF THE PART IN THIS DRAWING HAS BEEN APPROVED BY DE HAVILLAND INC. FOR MANUFACTURE BY OR ON BE-
HALF OF THE RECIPIENT . THE RECIPIENT IS RESPONSIBLE FOR (A) PROPER MANUFACTURE OF THE PART USING THE SPECI-
FIED MATERIALS AND FOR INCORPORATION OF THE MODIFICATION, ALL IN ACCORDANCE WITH THE DRAWING AND RELATED
INSTRUCTIONS, AND (B) APPROVAL OF THE FINAL INSTALLATI ON BY THE RELEVANT AIRWORTHINESS AUTHORITY . DE HAVIL-
LAND INC. AND BOMBARDIER INC. (BOMBARDIER AEROSPACE) DISCLAIM ANY RESPONSIBILITY FOR INCIDENTAL OR CONSE-
QUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION LOSS OR USE, LOSS OF REVENUE OR LOSS OF PROFIT , ARISING FROM
SUCH MANUFACTURE, INCORPORATION AND INSTALLATION.
1

### Page 17

May2018
SERVICE BULLETIN (SB) - - - RECORD OF INCORPORATION
- - - Q SERIES DASH 8 AIRCRAFT
To : CMDB Focal
Facsimile: (1) 416 375 4538
E- -mai l: cmdb.requests@aero.bombardier .com
From:
Company:
Phone: Extn:
Facsimile: Date:
E- -mai l:
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
Submit

### Page 18

May 2018
SERVICE BULLETIN (SB) - - - COMMENT SHEET - - - Q SERIES DASH 8 AIRCRAFT
To : SB Focal (T oronto), Bombardier Aerospace Commercial Aircraft
Phone: (1) 416 375 4078 Facsimile: (1) 416 375 4538
E- -mai l: syed.rizvi@aero.bombardier .com
From:
Company:
Phone: Extn:
Facsimile: Date:
E- -mai l:
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 T ooling V References V Publications Affected
2. MATERIAL INFORMATION
V Kit Content V Special T ools/Equipment V Parts to Modify Spares
V Consumables V Disposition of Existing Parts V Other
3. ACCOMPLISHMENT INSTRUCTIONS
V J o b S e t --- U p V Procedure V Close- - -Out V Te s t
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
Submit

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