# Bombardier Service Bulletin 84-32-153

Copy: Revision A ("84-32-153A Released"), 14 pages: PDF https://openairdocs.org/files/sha256/4a/8a/4a8a4bc8d8470d2a21b6cb2aaf7fb54c00d81f238a47a572801a53a9f2f53ea9; text https://openairdocs.org/service-documents/bombardier/sb-84-32-153/file/4a8a4bc8d847.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: 84-32-153
- Latest revision known: 84-32-153, Revision A, dated February 27, 2018 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/sb-84-32-153

## 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-84-32-153/proposed.md).

## Text (14 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

Revision ‘A’ 27 Feb 2018
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 3
Landing Gear - - - Special Inspection and Rectification - - - NLG Locking
Mechanism
This page transmits Revision ‘A’ of Service Bulletin 84- - -32- - -153, pages 1
thru 10, dated: 27 Feb 2018
This service bulletin is re- - -issued in its entirety for the reasons that follow:
--- t h eDescription section is revised to clarify the work done
--- t h eCompliance section is revised to add the AD number
--- t h eReferences section is revised to convey the latest revision of the service
bulletin and engineering documentation
--- t h eACCOMPLISHMENT INSTRUCTIONS section is revised to clarify the
inspection procedure
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 the initial issue of Service Bulletin 84- - -32- - -153 and replace with
attached.
Previous issue(s) of Service Bulletin 84- - -32- - -153:
Initial issue - - - Pages 1 thru 12 dated: 22 Sep 2017

### Page 2

(No text on this page.)

### Page 3

D
S.B. 84- - -32- - -153
Page 1 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 3200 NUMBER: 84- - -32- - -153
BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGE OPERATORS TO PROMPTL Y EVALUATE THE CONTENTS
SUBJECT : Landing Gear - - - Special Inspection and Rectification - - - NLG Locking
Mechanism
1. PLANNING INFORMA TION
A. Effectivity
Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 401 and 402 all serial numbers with
Lower Lock Link 47324- - -1 that have completed 8000 Flight
Cycles.
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.

### Page 4

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 2 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
Spares Affected:
None
B. Reason
Problem: There have been reports of the bushings on the lock link of the NLG locking
mechanism becoming loose. This condition was caused due to insufficient
interference fit and results with bushing outer diameter wear/fretting.
Dislodged bushing will also cause sealant to break. The broken sealant
allows moisture ingress and corrosion that can accelerate free play
buildup. Excessive free play at the lock link can result with inability to
retract/deploy NLG fully.
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 NLG drag strut lower lock link is removed inspected and either repaired per RD
8/4- - -32- - -0338, re- - -installed or replaced
- - - if the lock link has been repaired an inspection is done to check for paint stripe
(witness mark) misalignment
- - - a NLG retraction system operational check is done
- - - close out.
D. Compliance
Bombardier Inc. highly recommend that this service bulletin be incorporated at the
earliest opportunity unless otherwise directed by the operator’s airworthiness
authority.
Transport Canada Airworthiness Directive CF- - -2018- - -01 has been issued.

### Page 5

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 3 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
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 2.50 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 0.25
Procedure 1.00
T e s t/R T S 1.00
Close- - -Out 0.25
This estimate is for direct labour done by an experienced crew and it does not include,
planning, familiarization, cure time, partfabrication, tool acquisition or lost time.
G. Material - - - Price and Availability
None
H. T ooling - - - Price and Availability
None
I. Weight and Balance
Not affected
J. Electrical Load Data
Not affected
K. Publications Affected
None

### Page 6

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 4 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
L. References
Revision ‘A’ of this service bulletin was prepared to the related data that follows:
ADR DVOG- - -18- - -1537416 (for internal reference only)
ADR MDAY- - -18- - -35539688 (for internal reference only)
PCA 46638 Revision 0 (for internal reference only)
C M M 3 2 --- 2 1 --- 0 3 D r a g S t r u t A s s e m b l y, N L G
Transport Canada Airworthiness Directive CF- - -2018- - -01
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft
None
B. Parts Required to Modify Spares
None
C. Special T ools and Equipment Required
None
D. Existing Parts Accountability
None
3. ACCOMPLISHMENT INSTRUCTIONS
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 .

### Page 7

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 5 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
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: 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) Set wheel chocks in front and behind the landing gear tires.
(3) Make sure the nose gear ground lock is engaged. Refer to AMM T ask
10- - -11- - -00- - -400- - -801.
(4) Make sure that lock pins are installed through each main gear and main gear
d o o r m e c h a n i s m . R e f e r t o A M M Ta s k s 1 0 --- 1 1 --- 0 0 --- 4 0 0 --- 8 0 2 a n d
32- - -00- - -00- - -840- - -801.
(5) Check the NLG Lower Lock Link Part Number as follows:
- - -if the part number is 47324- - -1 go to Procedure (PART A)
- - -if the part number is 47324- - -1 SCR- - -093- - -17- - -B and the paint stripe is present
go to Procedure (PART B)
NOTE: The PART A inspection & repair of the procedure, applies to all four
bushings, but the torque stripe is only applied to the two bushings
identified in this service bulletin. Refer to Figure 3.
B. Procedure (PART A)
(1) Obey all hydraulic safety precautions per AMM TASK 29- - -00- - -00- - -910- - -801.

### Page 8

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 6 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
(2) Remove NLG Drag Strut per AMM TASK 32- - -21- - -06- - -000- - -801.
NOTE: It is acceptable to raise the NLG only, as mentioned in the AMM task.
(3) Disassemble the Lower Lock Link P/N 47324- - -1 from the NLG Drag Strut per
CMM chapter 3, sections 2J and 2K.
(4) Inspect the Lower Lock Link P/N 47324- - -1 and at the operators discretion either:
(a) Repair lock link per latest approved RD 8/4- - -32- - -0338 or
(b) If serviceable re- - -install existing lock link or
(c) Replace with a serviceable lock link P/N 47324- - -1 (SCR- - -093- - -17- - -B)or
(d) Replace with a new serviceable lock link P/N 47324- - -1
(5) Re- - -assemble lock link into NLG Drag Strut assembly per CMM chapter 7,
section 3C & 3D.
(6) Re- - -install NLG Drag Strut Assembly per TASK 32- - -21- - -06- - -400- - -801,
NOTE: If only the NLG was raised (jacked), do a retraction and extension of
the NLG per AMM T ask 32- - -31- - -00- - -867- - -802.
(7) Grease all Drag Strut joints per AMM T ask 12- - -20- - -01- - -640- - -802.
C. Close Out (PART A)
(1) Remove all tools and equipment from the work area.
(2) On completion of this service bulletin, make the following entry in the appropriate
logbooks: “Service Bulletin 84- - -32- - -153 Landing Gear - - - Special Inspection and
Rectification - - - NLG Locking Mechanism PART A accomplished .”
D. Procedure (PART B)
(1) Inspect NLG drag strut lower lock link, P/N 47324- - -1 SCR- - -093- - -17- - -B and
bushings as follows: (ref Fig 1)

### Page 9

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 7 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
NOTE: Removal of Drag Strut/Lock Link for inspection is not required but can
be done at operators discretion. In this case follow AMM procedures.
(a) If necessary, clean the inspection areas using isopropyl alcohol (08- - -14).
(b) Use a mirror, flashlight and magnifier, as required to visually inspect lock link
bushings for any paint stripe misalignment. (ref Fig 2 & 3)
(c) If there are any signs of paint stripe misalignment or it is not possible to verify if
the paint stripe is properly aligned, do as follows:
1 Obey all hydraulic safety precautions per TASK 29- - -00- - -00- - -910- - -801.
2 Remove NLG Drag Strut per AMM TASK 32- - -21- - -06- - -000- - -801.
NOTE: It is acceptable to raise the NLG only, as mentioned in the AMM task.
3 Disassemble the Lower Lock Link P/N 47324- - -1 or 47324- - -1
S C R --- 0 9 3 --- 1 7 --- B f r o m t h e N L G D r a g S t r u t p e r C M M c h a p t e r 3 , s e c t i o n s
2J and 2K.
4 Repair Lower Lock Link per latest approved RD 8/4- - -32- - -0338.
5 Re- - -assemble lock link into NLG Drag Strut assembly per CMM chapter 7,
section 3C & 3D.
6 Re- - -install NLG Drag Strut Assembly per TASK 32- - -21- - -06- - -400- - -801.
NOTE: If only the NLG was raised (jacked), do a retraction and extension of
the NLG per AMM T ask 32- - -31- - -00- - -867- - -802.
7 Grease all Drag Strut joints per AMM T ask 12- - -20- - -01- - -640- - -802.
(d) If there are no signs of paint stripe misalignment, go to Close Out (PART B)
section.
E. Close Out (PART B)
(1) Remove all tools and equipment from the work area.
(2) On completion of this service bulletin, make the following entry in the appropriate
logbooks: “Service Bulletin 84- - -32- - -153 Landing Gear - - - Special Inspection and
Rectification - - - NLG Locking Mechanism PART B accomplished .”

### Page 10 (OCR)

SERVICE BULLETIN 84-32-153
LOWER LOCK LINK
Lock Link Location
Figure 1
22 Sep 2017  S.B. 84-32-153
Revision 'A' 27 Feb 2018  Page 8 of 10
JR

### Page 11

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 9 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
Lock Link Bushing Location
Figure 2

### Page 12

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 5 3
S.B. 84- - -32- - -153
Page 10 of 10
22 Sep 2017
Revision ‘A’ 27 Feb 2018 JR
Lock Link Paint Stripe Application Area
Figure 3
1

### Page 13

Jan 2009
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 14

Feb 2009
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

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.