# Bombardier Service Bulletin 84-32-75

Copy: No revision named ("U.S. DOT/FAA - Service Information - 6"), 12 pages: PDF https://openairdocs.org/files/sha256/51/6f/516feecd437360967bc08e844fdb304aa507771fa8d8023744af6b78eb956554; text https://openairdocs.org/service-documents/bombardier/sb-84-32-75/file/516feecd4373.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0422; AD 2012-15-16 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: 84-32-75
- Page: https://openairdocs.org/service-documents/bombardier/sb-84-32-75

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

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

- [AD 2012-15-16](https://openairdocs.org/ad/2012-15-16.md), effective Sep 12, 2012: No revision named

## Text (12 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-0422; AD 2012-15-16 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Each page's text from the PDF; open the PDF at a page with #page=N.

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SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 3221 NUMBER: 84- - -32- - -75
BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGES OPERATORS TO PROMPTL Y EVALUATE THE CONTENTS
SUBJECT : Landing Gear - - - Nose Landing Gear Mechanism - - - Linkage Assembly - - -
Special Inspection and Rectification - - - ModSum 4- - - 113675
1. PLANNING INFORMA TION
A. Effectivity
Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 401 and 402 Serial Numbers 4006,
4008, 4012 thru 4015, 4018 thru 4023, 4073 thru 4197.
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: A number of spare non- - -conforming pushrods (used in the NLG door
mechanism) were supplied to Goodrich and were installed on some
aircraft.
Solution: Do a part number inspection of the left hand side pushrod. If the part
number matches one of the 34 suspect lot numbers the operator should
order the replacement modkit and replace the pushrod.
C. Description
The procedures in this service bulletin give the instructions to do the tasks that
follow:
- - - aircraft electrical power is removed
- - - main landing gear lock pins are installed thru each main gear and main gear
door mechanism
- - - the NLG ground lock is engaged
- - - the lot number of the left hand side pushrod for the NLG door mechanism is
inspected and recorded
- - - if the lot number matches one of the 34 suspect lot numbers the pushrod is replaced
with a nonsuspect pushrod. An operational check of the NLG doors is done after
the pushrod replacement
- - - close out.
D. Compliance
Bombardier Inc. recommends incorporation of Service Bulletin 84- - -32- - -75 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
O r g a n i z a t i o n N o : D A O # 9 3 --- Q --- 0 2 .
This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage
T olerance Inspections (DTIs).

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F. M a n p o w e r
It will take an estimated 1.25 man- - -hours to complete the Special Inspecton
section of 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 0.25
T e s t/R T S N/A
Close- - -Out
(if Rectification
not required)
0.50
In addition, it will take an estimated 6.00 man- - -hours to complete the Rectification
section of 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 1.00
Close- - -Out 0.50
G. Material - - - Price and Availability
If required, ModKit 8MK4279- - -001 is available through the Customer Accounts
Service T eam at Bombardier Aerospace Regional Aircraft division. Operators
should submit a purchase order specifying aircraft serial number(s) to:
Bombardier Aerospace
Customer Accounts Services T eam (Mail Stop N11- - -32)
123 Garratt Blvd.
To r o n t o
Ontario
Canada M3K- - -1Y5
Facsimile: (416) 375- - -3060
T elephone : (416) 375- - -3920

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Kit Number Description
8MK4279- - -001 Retrofit Kit - - - Push Rod Assembly Replacement - - - NLG
H. T ooling - - - 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:
DRAWING SHEET REV
8MK4279 1 B
ModSum 4Q113675 Rev. ‘A’
ModSum 4- - -113675 Rev. ‘A’
PCA 40535 Revision 2 (for internal reference only)
Transport Canada Airworthiness Directive Pending
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft
(1) Modification Kit 8MK4279- - -001, Retrofit Kit - - - Push Rod Assembly
Replacement - - - NLG

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(2) Detailed Kit Content:
Quantity Per Kit
--- 0 0 1
Part Number Description Remarks
1 83232012- - -951 P u s h r o d --- N L G
2 MS24665- - -153 Cotter Pin
4 AN960- - -516 Washer
B. Parts Required to Modify Spares
None
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
p e rn e x th i g h e ra s s e m b l yf o ri n d e n t e dp a r t s .
Existing
Part Number Description Qty. IC DC
New Part
Number PNC
83232012- - -001 P u s h r o d --- N L G1 C DES 83232012- - -951 N
IC Interchangeability Code
A Not interchangeable.
B Removed Part. No direct replacement.
C Conditionally Interchangeable. Inst allation of superseded part negates the
intent of this service bulletin.
DC Disposition
DES Destroy 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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PNC Part Number Code
NN e w p a r t .
R Part number after rework.
S Superseding or equivalent part number.
X Existing part and new part are functionally and physically equivalent but not
identical.
3. ACCOMPLISHMENT INSTRUCTIONS
A . J o b S e t --- U p
(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 2 4 --- 0 0 --- 0 0 --- 8 6 1 --- 8 0 2 a n d
TASK 24- - -00- - -00- - -910- - -801).
(2) Make sure that lock pins are installed thru each main gear and main gear door
mechanism.
WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN
LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED.
IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALL Y
RETRACT . THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE
TO THE EQUIPMENT .
WARNING: BE SURE THAT THE HYDRAULIC PRESSURE IS OFF , AND THAT
THERE IS NO PRESSURE IN THE HYDRAULIC SYSTEM. IF YOU DO
NOT DO THIS YOU CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO THE EQUIPMENT .
(3) Make sure the NLG ground lock is engaged.
B. Procedure
Special Inspection
(1) Refer to Figure 1 and gain access to the NLG door linkage.
NOTE: The lot numbers identified below, are identified by ink stamp on the bell
crank assembly and is also recorded on the C of C shipped with the unit.
This lot number is the GLC work order number, identified with the
WO prefix.

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(2) Inspect the lot number of the pushrod and compare it with the lot numbers in
table below. If the lot number matches with any in the table, go to the
Rectification section and replace the pushrod. If the lot number does not match
with any in the table, go to the Close Out section and complete the service
bulletin.
ASSEMBL Y PART
NUMBER
LOT NUMBER
83232012- - -001 50989, 50990, 52770, 54671, 54672,
56907, 56908, 56909, 56910, 59187,
59188, 62108, 62109, 62110, 62111,
62112, 62113, 62114, 64192, 64193,
65788, 69856, 74759, 74760, 74761,
74762, 77155, 77156, 79516, 79517,
79518, 79519, 86489, 86490
Rectification
(3) Refer to Figure 2 and applicable steps in AMM TASK 32- - -22- - -16- - -000- - -801 and
remove push rod 83232012- - -001 from aft left nose landing gear door. Destroy
the pushrod.
(4) Refer to applicable steps in AMM TASK 32- - -22- - -16- - -400- - -801 and install new
push rod 83232012- - -951.
(5) Refer AMM TASK 32- - -31- - -00- - -710- - -801 and do the operational test of the
landing gear primary extension and retraction system
C. Close Out
(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- - -75 {Landing Gear - - - Nose
Landing Gear Mechanism - - - Linkage Assembly - - - Special Inspection and
rectification} accomplished.”

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Location of NLG Mechanism
Figure 1

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NLG Mechanism - - - View Looking Aft
Figure 2
PUSHROD
83232012- - -951
QTY: 1
WAS
PUSHROD
83232012- - -001
QTY: 1
COTTER PIN
MS24665- - -153
QTY: 1
WASHER
AN960- - -516
QTY:2
BOLT
NAS1105- - -12D REF .
BUSHING
N A S 7 5 --- 5 --- 0 0 6 R E F.
NUT
MS14145L5 REF .
COTTER PIN
MS24665- - -153
QTY: 1
WASHER
AN960- - -516
QTY:2
BOLT
NAS1105- - -12D REF .
BUSHING
N A S 7 5 --- 5 --- 0 0 6 R E F.
NUT
MS14145L5 REF .
BELLCRANK REF .

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This Page Intentionally Blank
1

### Page 11

Jan 2009
SERVICE BULLETIN (SB) - - - RECORD OF INCORPORATION
- - - Q SERIES DASH 8 AIRCRAFT
To : Partner Data Co- - -Ordinator (T oronto), Bombardier Aerospace Commercial Aircraft
Phone: (1) 416 375 3534 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

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

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