# Bombardier Service Bulletin 84-52-66

Copy: Revision A ("U.S. DOT/FAA - SB 84-52-66A"), 10 pages: PDF https://openairdocs.org/files/sha256/6e/5d/6e5dd440f604bf99ff5d0dd4cb21825290a99389f9e817c790fe8629aae62c1f; text https://openairdocs.org/service-documents/bombardier/sb-84-52-66/file/6e5dd440f604.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-1226; AD 2014-03-04 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: 84-52-66
- Latest revision known: 84-52-66, Revision A, dated October 24, 2011 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/sb-84-52-66

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

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

- [AD 2014-03-04](https://openairdocs.org/ad/2014-03-04.md), effective Apr 9, 2014: Revision A

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-84-52-66/proposed.md).

## Text (10 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2012-1226; AD 2014-03-04 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.

### Page 1

Revision ‘A’ 24 Oct 2011
DHC-8 (DASH 8)
SERVICE BULLETIN 84-52-66
Doors - Machined Handle Shaft - Aft Entry & Aft Service Doors -
Replacement - ModSum 4-113687
This page transmits Revision ‘A’ of Service Bulletin 84-52-66,
pages 1 thru 6, dated: 24 Oct 2011.
This service bulletin is re-issued in its entirety for the reasons that follow:
the Effectivity section is revised to change serial numbers affected
the References section is revised to convey the latest revision of the service
bulletin and engineering documentation
the Accomplishment Instructions section is revised to provide correct
Maintenance Manual Task
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 previous issue of Service Bulletin 84-52-66 and replace with
attached.
Previous issues of Service Bulletin 84-52-66:
Initial issue - Pages 1 thru 6 dated 25 Jul 2011

### Page 2

(No text on this page.)

### Page 3

D
S.B. 84-52-66
Page 1 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 5241 NUMBER: 84-52-66
BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND
URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS
SUBJECT: Doors - Machined Handle Shaft - Aft Entry & Aft Service Doors -
Replacement - ModSum 4-113687
1. PLANNING INFORMATION
A. Effectivity
Aircraft Affected:
In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001,
4003 thru 4364.
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

### Page 4

SERVICE BULLETIN 84-52-66
S.B. 84-52-66
Page 2 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
B. Reason
Problem: There have been issues reported of door handle loads increasing and one
instance of a door handle jamming on opening. These conditions might be
caused by the pins on the existing handle shaft migrating and causing the
handle to jam.
A jammed handle could prevent the opening of the door.
Solution: This Mod allows for the in-service replacement of the existing aft entry &
aft service door internal handle shaft with the single piece machined
handle shaft.
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
- the existing aft entry & aft service internal door handle shaft is removed and
discarded
- a new aft entry & aft service internal door handle shaft is installed
- a functional test of the aft entry & aft service doors is done
- close out.
D. Compliance
Bombardier Inc. highly recommend that ModSum 4-113687 be incorporated 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 #93-Q-02.
This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage
Tolerance Inspections (DTIs).

### Page 5

SERVICE BULLETIN 84-52-66
S.B. 84-52-66
Page 3 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
F. Manpower
It will take an estimated 6.75 man-hours (per door) 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 6.00
Test / RTS 0.25
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
The parts detailed in Paragraph 2.A. m ay be obtained from any Bombardier
Aerospace Regional Aircraft authorized parts source. The price and availability will
be quoted at the time of order.
H. Tooling - 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..................................
Maintenance Requirement Manual PSM 1-84-7....................

### Page 6

SERVICE BULLETIN 84-52-66
S.B. 84-52-66
Page 4 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
L. References
Revision ‘A’ of this service bulletin was prepared to the engineering drawings and
related data that follows:
DRAWING SHEET REV
8DK4169 1 C
ModSum 4Q113687 Rev. ‘G’
ModSum 4-113687 Rev. ‘G’
PCA 41838 Revision 1 (for internal reference only)
Transport Canada Airworthiness Directive Pending
2. MATERIAL INFORMATION
A. Parts Required Per Aircraft
(1) Detailed Parts List:
Quantity
Per Aircraft
Part Number Description Remarks
1 85217916-116 Handle Shaft
1 85217916-115 Handle Shaft
B. Parts Required to Modify Spares
None
C. Special Tools and Equipment Required
None
D. Existing Parts Accountability
None

### Page 7

SERVICE BULLETIN 84-52-66
S.B. 84-52-66
Page 5 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
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 aft entry
& aft service doors. Make sure the work platforms or ladders are electrically
grounded.
B. Procedure
(1) Remove and discard existing internal handle shaft from the aft entry door. Refer
to Maintenance Manual Task 52-12-01-000-802.
(2) Install new internal handle shaft 85217916-115 on the aft entry door. Refer to
Maintenance Manual Task 52-12-01-400-802 and to Figure 1.
(3) Remove and discard existing internal handle shaft from the aft service door.
Refer to Maintenance Manual Task 52-41-01-000-802.
(4) Install new internal handle shaft 85217916-116 on the aft service door. Refer to
Maintenance Manual Task 52-41-01-400-802 and to Figure 1.
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 8

SERVICE BULLETIN 84-52-66
S.B. 84-52-66
Page 6 of 6
25 Jul 2011
Revision ‘A’ 24 Oct 2011
JR
Aft Entry & Aft Service Doors Location
Figure 1
AFT ENTRY DOOR
AFT SERVICE DOOR
9

### Page 9

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 10

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.