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Tx Ltr SB 84−32−168 Page 1 of 2 MP Revision ‘A’ 08 Feb 2022 DHC−8 (DASH 8) SERVICE BULLETIN 84−32−168 Landing Gear − Main Landing Gear − Lubrication of Main Landing Gear This page transmits Revision ‘A’ of Service Bulletin 84−32−168, pages 1 thru 8, dated 08 Feb 2022.
This service bulletin is re−issued in its entirety for the reasons that follow:
− The Effectivity section is revised − The References section is revised to convey the latest revision of the service bulletin and engineering documentation.
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 previous revision of Service Bulletin 84−32−168 and replace with attached.
Previous issues of Service Bulletin 84−32−168:
Initial issue − Pages 1 thru 8 dated 03 Dec 2021
SERVICE BULLETIN 84−32−168 Tx Ltr SB 84−32−168 Page 2 of 2 MP Revision ‘A’ 08 Feb 2022 This Page Intentionally Blank 1
S.B. 84−32−16803 Dec 2021 MP Page 1 of 8Revision ‘A’ 08 Feb 2022
SERVICE BULLETIN ATA SYSTEM: 3211 NUMBER: 84−32−168
DE HAVILLAND AIRCRAFT OF CANADA LIMITED (DHC) CONSIDERS
URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS
THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND SUBJECT: Landing Gear − Main Landing Gear − Lubrication of Main Landing Gear
1. PLANNING INFORMATION A. Effectivity Aircraft Affected:
In−Service: DHC−8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003 through 4633.
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 DHC 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: Two incidents of not being able to achieve the downlocked position on one of the main landing gear have been observed.
Cause: Some aircraft utilization is low and standard greasing interval of 500FH might not be achieved in the typical timeframe resulting in possibility of deterioration of greasing effectiveness over time which can lead MLG failing to achieve safe downlocked position.
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 2 of 8Revision ‘A’ 08 Feb 2022 Solution: The SB will perform inspection of the greasing records of main landing gear to verify elapsed time from the last greasing operation per MRB TASK 320001−201. If elapsed time is 3 months or more, greasing operation will be performed at the identified main landing gear joints.
C. Description The procedures in this service bulletin give the instructions to do the tasks that follow:
− Aircraft hydraulic power/pressure is removed − 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 − Inspection of the main landing gear records is done − Lubrication of the main landing gear at the joints is done as required − Close out.
D. Compliance De Havilland Aircraft of Canada Limited highly recommends that SB 84−32−168 be incorporated at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority.
This Service Bulletin will be mandated by a pending Transport Canada Airworthiness Directive.
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 #19−Q−01.
A Transport Canada Airworthiness Directive Pending.
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 3 of 8Revision ‘A’ 08 Feb 2022 F . Manpower It will take an estimated 1.00 man−hours to complete this service bulletin.
This estimate is for direct labour done by an experienced crew and it does not include, planning, familiarization, cure time, part fabrication, tool acquisition or lost time.
G. Material − Price and Availability None H. Tooling − Price and Availability None I. Weight and Balance Not Affected J. Electrical Load Data Not Affected K. Publications Affected None L. References Revision ‘A’ of this service bulletin was prepared to the related data that follows:
PCA 48509 Revision 0 (for internal reference only).
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 4 of 8Revision ‘A’ 08 Feb 2022
2. MATERIAL INFORMATION A. Parts Required Per Aircraft None B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None
3. ACCOMPLISHMENT INSTRUCTIONS A. Job Set−Up 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 ACCIDENTALLY 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 ACCIDENTALLY CLOSE THE LANDING GEAR DOORS. THIS
CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT .
(1) Obey all the hydraulic safety precautions (refer to AMM TASK 29−00−00−910−801).
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 5 of 8Revision ‘A’ 08 Feb 2022
(2) Make sure that all hydraulic pressure is off and that there is no pressure in the hydraulic system (refer to AMM TASK 29−00−00−863−802 and TASK 29−00−00−863−804).
NOTE: Make sure that the park break pressure is not removed/released.
(3) Placard and select all aircraft electrical power to OFF . Obey all relevant WARNINGS and CAUTIONS (refer to AMM TASK 24−00−00−861−802 and TASK 24−00−00−910−801).
(4) Make sure that lock pins are installed through each main gear.
(5) Make sure the nose gear ground lock is engaged.
(6) Set wheel chocks in front and behind the landing gear tires.
(7) Open and lock the main landing gear doors.
B. Procedure
(1) Review the maintenance records to verfiy the elapsed time and FH from the last greasing operation on main landing gear.
(2) If it has been over 3 months since the last greasing, perform greasing on lock actuator assembly, stabilizer brace to nacelle structure attachment, downlock assembly, stabilizer brace pivot, stabilizer brace to yoke attachment and retractor actuator lug end as per AMM TASK 12−20−01−640−803 (refer to Figure 1).
C. Close Out
(1) Remove all tools and equipment from the work area.
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 6 of 8Revision ‘A’ 08 Feb 2022
MAIN LANDING GEAR
1. Stabilizer brace to nacelle structure attachment (6 places).
2. Stabilizer brace to yoke attachment (6 places).
Grease gun
LUBRICATION METHOD 2 Be careful with the lubrication fittings at the locations identified. Make sure the fittings are clean, not loose and correctly installed after lubrication.
LEGEND Left and right side.
Left and right stabilizer.
NOTES cg6223a01.dg, cm, sep09/2021 1 Lubrication of Main Landing Gear Figure 1 (sheet 1 of 3)
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 7 of 8Revision ‘A’ 08 Feb 2022 Lubrication of Main Landing Gear Figure 1 (sheet 2 of 3) 66 3 3 5 4 4 44 Grease gun
LUBRICATION METHOD An asterisk ( ) is shown adjacent to the lubrication points where it is necessary to use the MS 24203 nozzle.
NOTES Be careful with the lubrication fittings at the locations identified. Make sure the fittings are clean, not loose and correctly installed after lubrication.
Fittings facing inboard and outboard.
Left and right stabilizer.
Spring assembly removed for clarity.4 LEGEND
3. Lock actuator assembly (5 places).
4. Downlock assembly (11 places).
5. Stabilizer brace pivot (6 places).
6. Retraction actuator lug end (2 places).
4 cg6223a02.dg, cm, sep09/2021
SERVICE BULLETIN 84−32−168 S.B. 84−32−16803 Dec 2021 MP Page 8 of 8Revision ‘A’ 08 Feb 2022 Lubrication of Main Landing Gear Figure 1 (sheet 3 of 3) LEGEND 3 04−03
3. Lock actuator assembly (5 places).
Grease gun
LUBRICATION METHOD An asterisk ( ) is shown adjacent to the lubrication points where it is necessary to use the MS 24203 nozzle.
NOTES Grease fitting rotated into view.5 5 cg6223a03.dg, cm, sep09/2021
Oct 2019
SERVICE BULLETIN (SB) - - - RECORD OF INCORPORATION DASH 8 AIRCRAFT To : CMDB Focal Email: cmdb.request@dehavilland.com From:
Company:
Phone: Extn:
Facsimile: Date:
Email:
The data that you provide below will help us record the incorporation of this Service Bulletin 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:
Email PDF to:
cmdb.request@dehavilland.com
Oct 2019 SERVICE BULLETIN (SB) - - - COMMENT SHEET - - - DASH 8 AIRCRAFT To : SB Focal, DE HAVILLAND AIRCRAFT OF CANADA LIMITED Phone: 1 (416) 373 - - -5098 Email: george.moffatt@dehavilland.com From:
Company:
Phone: Extn:
Facsimile: Date:
Email:
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 Email PDF to:
george.moffatt@dehavilland.com