# Bombardier Service Bulletin 84-32-154

Copy: Revision A ("SB 84-32-154 Rev A split"), 12 pages: PDF https://openairdocs.org/files/sha256/d0/23/d023d5f2f5afc0b0baffc27e97025c073340c27c565d9554d2f9f86d348c0d13; text https://openairdocs.org/service-documents/bombardier/sb-84-32-154/file/d023d5f2f5af.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2018-0453; AD 2019-18-05 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: 84-32-154
- Latest revision known: 84-32-154, Revision A, dated November 21, 2018 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/sb-84-32-154

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

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

- [AD 2019-18-05](https://openairdocs.org/ad/2019-18-05.md), effective Oct 31, 2019: Revision A

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-84-32-154/proposed.md).

## Text (12 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2018-0453; AD 2019-18-05 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

T x L t r S B 8 4 --- 3 2 --- 1 5 4
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Revision ‘A’ 21 Nov 2018
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D H C --- 8 ( D A S H 8 )
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 4
SUBJECT : Landing Gear - - - NLG Installation - - - Introduction of New
Drag Strut Assy 47300- - - 13 Due to New Lock Link 47324- - - 3 to Improve
Retention of Bushings and Resistance Against Corrosion- - - ModSum
4 - - - 113987
This page transmits Revision ‘A’ of Service Bulletin 84- - -32- - -154, pages 1 thru 8,
dated 21 Nov 2018.
This service bulletin is re- - -issued in its entirety for the reasons that follow:
--- t h eSubject title is revised
--- t h eEffectivity section is revised to move aircraft s/n 4586 from In- - -Service to
Production
- - - all references to “VSB 47300- - -32- - -138 R1” have been changed to “VSB
47300- - -32- - -138 R3”
--- t h eExisting Parts Accountability section is revised to add p/n 47300- - -7 and to
change the Interchangeability Code (IC) for p/n’s 47300- - -9 and - - -11 from Not
Interchangeable (A) to One- - -Way Interchangeable (*)
--- t h eReferences section is revised to convey the latest revision of the service
bulletin and engineering documentation
--- t h eProcedures section step (5) is revised to change AMM TASK
1 2 --- 2 0 --- 0 1 --- 6 4 0 --- 8 0 3 t o A M M T A S K 1 2 --- 2 0 --- 0 1 --- 6 4 0 --- 8 0 2
- - - the attached VSB is replaced with the latest revision.
The Compliance in the previous issue(s) of this service bulletin is not affected by
this revision. No additional rework to the aircraft is introduced by this revision.
Remove the initial issue of Service Bulletin 84- - -32- - -154 and attached VSB, and
replace with attached.
Previous issue(s) of Service Bulletin 84- - -32- - -154:
Initial issue - - - Pages 1 thru 8 dated 04 Jun 2018

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1

### Page 3

D
S.B. 84- - -32- - -154
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NB
Revision ‘A’ 21 Nov 2018
SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 3221 NUMBER: 84- - -32- - -154
BOMBARDIER AEROSPACE CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGE OPERATORS TO PROMPTL Y EVALUATE THE CONTENTS
SUBJECT : Landing Gear - - - NLG Installation - - - Introduction of New Drag Strut Assy
47300- - - 13 Due to New Lock Link 47324- - - 3 to Improve Retention of
Bushings and Resistance Against Corrosion- - - ModSum 4- - - 113987
1. PLANNING INFORMA TION
A. Effectivity
Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 401 and 402 Serial Numbers 4001,
4003 thru 4585, 4587.
Related ModSum Title
4Q113987 L a n d i n g G e a r --- N L G I n s t l n --- I n t r o d u c t i o n o f N e w
Drag Strut Assy P/N 47300- - -13 Due to New Lower
Lock Link P/N 47324- - -3 to Improve Retention of
Bushings and Resistance Against Corrosion
Production: ModSum 4- - -113987 will be installed before delivery on
applicable DHC- - -8 Aircraft at Serial Number 4586, 4588 and
subsequent.

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Revision ‘A’ 21 Nov 2018
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.
B. Reason
Problem: An operator experienced a landing with NLG jammed in the partially
extended position.
Cause: Investigation revealed loose bushings and corrosion of the P/N 47324 lock
link lug bore (at the lower drag attachment joint) to be a contributing factor.
The poor retention of the bushings led to moisture ingress, wear and
corrosion.
Solution: This service bulletin introduces ModSum 4- - -113987. The ModSum
introduces a new configuration lower link, which has new bushings with
improved retention and greasing provisions.
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
- - -the aircraft is lifted on jacks and the NLG drag strut is removed
- - -the existing lower lock link is replaced
- - -the affected parts are re- - -identified
- - -the NLG drag strut is installed
- - -drag strut joints are greased
- - -the necessary tests/checks are done
- - -close out.

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Revision ‘A’ 21 Nov 2018
D. Compliance
Bombardier Inc. highly recommend that ModSum 4- - -113987 be incorporated at the
earliest opportunity unless otherwise directed by the operator’s airworthiness
authority.
A 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) or Damage
T olerance Inspections (DTIs).
F. M a n p o w e r
It will take an estimated 5.00 man- - -hours 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 0.50
Procedure 4.00
T e s t/R T S 0.00
Close- - -Out 0.50
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
Refer to enclosed UTC Aerospace Systems VSB 47300- - -32- - -138 R3.
H. T ooling - - - Price and Availability
None

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Revision ‘A’ 21 Nov 2018
I. Weight and Balance
Not affected
J. Electrical Load Data
Not affected
K. Publications Affected
Aircraft Illustrated Parts Catalog 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:
ModSum 4- - -113987 Rev. ‘F’
ModSum 4N113987 Rev. ‘E’
ModSum 4Q113987 Rev. ‘B’
PCA 46799 (for internal reference only)
UTC Aerospace Systems VSB 47300- - -32- - -138 R3 dated Aug 20/18
Transport Canada Airworthiness Directive Pending.
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft
Refer to enclosed UTC Aerospace Systems VSB 47300- - -32- - -138 R3.
B. Parts Required to Modify Spares
None

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Revision ‘A’ 21 Nov 2018
C. Special T ools 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
47324- - -1 Lower Lock Link 1 * DIS 47324- - -3 S
47300- - -7
OR
47300- - -9
OR
47300- - -11
NLG Drag Strut Assy
NLG Drag Strut Assy
NLG Drag Strut Assy
1
1
1
*
*
*
RWK
RWK
RWK
47300- - -7A
47300- - -9A
47300- - -11A
R
R
R
* New Part is one- - -way interchangeable with Existing Part.
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.

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Revision ‘A’ 21 Nov 2018
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
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 ON THE LANDING
GEAR DOORS. MAKE SURE YOU DISCONNECT THE LANDING
GEAR DOORS. IF YOU DO NOT DO THIS THE LANDING GEAR
DOORS WILL CLOSE WHEN YOU APPL Y THE HYDRAULIC
PRESSURE. THIS CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO THE EQUIPMENT .
(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 the nose gear ground lock is engaged.
(3) Make sure that lock pins are installed through each main gear and main gear
door mechanism.
(4) Set wheel chocks in front and behind the landing gear tires.

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B. Procedure
(1) Remove the NLG drag strut (refer to AMM TASK 32- - -21- - -06- - -000- - -801.
(2) Replace the existing lower lock link 47324- - -1 with lower lock link 47324- - -3 per
the procedure given in the enclosed UTC Aerospace Systems VSB
47300- - -32- - -138 R3.
(3) Re- - -identify the affected parts per the instructions given in the
ACCOMPLISHMENT INSTRUCTIONS section of the enclosed UTC Aerospace
Systems VSB 47300- - -32- - -138 R3.
(4) Install the NLG drag strut (refer to AMM TASK 32- - -21- - -06- - -400- - -801.
(5) Grease all drag strut joints per AMM TASK 12- - -20- - -01- - -640- - -802.
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.

### Page 10 (OCR)

SERVICE BULLETIN 84-32-154
LOWER LOCK LINK
Lower Lock Link Location
Figure 1
04 Jun 2018  S.B. 84-32-154
Revision 'A' 21 Nov 2018  Page 8 of 8
NB

### Page 11

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

### Page 12

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

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