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Tx Ltr SB 84- - - 32- - - 164 P a g e1o f2 Revision ‘A’ 13 May 2021 JV DHC - - -8 (DASH 8) SERVICE BULLETIN 84 - - -32 - - -164 L a n d i n g G e a r --- N o s e W h e e l S t e e r i n g --- H y d r a u l i c M o t o r --- L o s s o f Configuration Control - - - Motor Jam due to Wear - - -ModSum 4 - - -114018 This page transmits Revision ‘A’ of Service Bulletin 84- - - 32- - - 164, pages 1 thru 8, dated 13 May 2021.
This service bulletin is re- - -issued in its entirety for the reasons that follow:
--- T h eReference section is revised to convey the latest revision of the service bulletin and engineering documentation.
- - - Revised theDescription, Manpower , Job Set- - -Upand Procedure sections.
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- - -164 and replace with attached.
Previous issue of Service Bulletin 84- - - 32- - - 164:
Initial issue - - - Pages 1 thru 8 dated 20 Apr 2020 DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 1 of 17
SERVICE BULLETIN 84- - -32- - -164 Tx Ltr SB 84- - - 32- - - 164 P a g e2o f2 Revision ‘A’ 13 May 2021 JV This Page Intentionally Blank DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 2 of 17
S.B. 84- - - 32- - - 164 P a g e1o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021
SERVICE BULLETIN ATA SYSTEM: 3221 NUMBER: 84- - -32- - -164
DE HAVILLAND AIRCRAFT OF CANADA LIMITED (DHC) CONSIDERS
THIS SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS SUBJECT : Landing Gear - - - Nose Wheel Steering - - - Hydraulic Motor - - - Loss of Configuration Control - - - Motor Jam due to Wear - - - ModSum 4 - - -114018
1. PLANNING INFORMA TION A. Effectivity Aircraft Affected:
In- - -Service: DHC - - - 8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003 thru 4622.
Related ModSum Title 4N114018 Landing Gear - - - Nose Wheel Steering - - - Hydraulic Motor - - - Loss of Configuration Control - - - Motor Jam due to Wear Production: ModSum 4- - - 114018 will be installed before delivery on applicable DHC- - -8 Aircraft at Serial Number 4623 and subsequent.
DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 3 of 17
SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e2o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 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:
Refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146 B. Reason Problem: De Havilland Aircraft of Canada Limited has identified a condition that could lead to loss of aircraft directional control and runway excursion. The nosewheel steering hydraulic motor piston rod shoes can wear and with sufficient wear , can compromise the piston shoe retention feature and dislodge when exposed to sufficient case pressure resulting in a jammed condition.
The motor supplier initiated a change in shoe design on the RS1267 steering motor to improve retention and prevent wear . The supplier did not change the part number of the motor during this product improvement.
Solution: This service bulletin provides the instructions to do an inspection of the nose wheel steering motor serial number. The discrepant serial number range is specified in the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146. If the motor serial number falls within the discrepant range it will be removed and replaced with a RS1267- - -5 motor.
If the motor serial number falls outside the discrepant range it will be re- - - labeled as RS1267- - - 5 motor. The incorporation of the RS1267- - - 5 motor will roll the part numbers of the gearbox assembly and the dressed shock strut assembly as per the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146.
This service bulletin also introduces a new steering motor P/N RS1267- - - 5 to prevent the steering motor jam and restores configuration control.
DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 4 of 17
SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e3o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 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 (NLG) lock is engaged
- - - The Main Landing Gear (MLG) lock pins are installed thru each main gear and main gear door mechanism
- - - Jacking of the NLG
- - - Remove the NLG Aft Doors connecting rods
- - - Retract the NLG
- - - Identify the steering motor part number and serial number on the nameplate
- - - if the steering motor part number and serial number is on the list in Section 1A, Part A of VSB 47200- - - 32- - - 146, or serial number is 379 and subsequent, re- - - identify the steering motor and extend the NLG
- - - If the steering motor part number or serial number are not in the list in Section 1A, Part A of VSB 47200- - - 32- - - 146, the motor must be removed
- - - Extend the NLG via the Alternate extension
- - - Remove the steering motor and return to Collins Customer Services for corrective action
- - - Install a new steering motor
- - - Retract the NLG
- - - Re- - -identify the gearbox assembly and dressed shock strut assembly
- - - Extend the NLG via the Alternate extension
- - - Install the NLG Aft Doors connecting rods
- - - Lower the Aircraft
- - - The operational test of the nose wheel steering system is done
- - - Close out.
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SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e4o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 D. Compliance De Havilland Aircraft of Canada Limited highly recommends that ModSum 4- - - 114018 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 #19- - - Q - - - 01.
This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage T olerance Inspections (DTIs).
F . Manpower It will take an estimated 7.00 man- - -hours to complete this service bulletin without the replacement of the steering motor. 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 3.00 Procedure 3.00 T e s t/R T S 0.00 Close- - -Out 1.00 It will take an estimated 11.00 man- - -hours to complete this service bulletin with the replacement of the steering motor. 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 3.00 Procedure 6.00 T e s t/R T S 1.00 Close- - -Out 1.00 DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 6 of 17
SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e5o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 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 Refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146.
H. T ooling - - - Price and Availability None I. Weight and Balance Not affected J. Electrical Load Data Not affected K. Publications Affected Aircraft Illustrated Parts Catalog P S M 1 --- 8 4 --- 4......................
ModSums Manual P S M 1 --- 8 4 --- 1 2..................................
L. References Revision ’A’ of this service bulletin was prepared to the engineering drawings and related data that follows:
DRAWING SHEET REV 83220400 1 AN ModSum 4- - - 114018 Rev. ‘C’ PCA 47618 Revision 1 (for internal reference only) ADR SHAR- - - 20- - - 22540933 (for internal reference only) ADR ALAC - - - 20- - - 29441010 (for internal reference only) DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 7 of 17
SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e6o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 Transport Canada Airworthiness Directive Pending UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146 dated Mar 30/2020.
2. MATERIAL INFORMA TION A. Parts Required Per Aircraft Refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146.
B. Parts Required to Modify Spares Refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146.
C. Special T ools and Equipment Required None D. Existing Parts Accountability Refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146.
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 DHC in the CRC at 1 (844) 272- - - 2720 (1 (844) CRC - - - CRC0) or email at thd@dehavilland.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 .
DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 8 of 17
SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e7o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021 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 .
(1) 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).
(2) Make sure that lock pins are installed through each main gear and main gear door mechanism.
(3) Make sure the nose gear ground lock is engaged.
(4) Set wheel chocks in front and behind the landing gear tires.
(5) Jack the aircraft at the NLG using the fuselage jacking point. (refer to the applicable instructions in AMM TASK 07- - - 10- - - 00- - - 582- - - 801).
B. Procedure
(1) Remove the NLG Aft Doors connecting rods only at the shock strut and secure the doors from damage (refer to AMM TASK 32- - - 22- - - 06- - - 000- - - 801)
(2) Retract the NLG. (refer to the applicable instructions in AMM TASK 32- - - 31- - - 00- - - 867- - - 802).
(3) Identify the steering motor part number and serial number as noted on the nameplate and do the applicable steps that follow:
(a) If the steering motor part number and serial number is on the list in Section 1A, Part A of VSB 47200- - - 32- - - 146, or serial number is 379 and subsequent, re- - -identify the steering motor from P/N RS1267- - -3 to P/N RS1267- - - 5 by replacing the label in situ. While the NLG is in the up and locked position with doors disconnected, re- - -identify the gearbox and shock strut assembly (refer to the enclosed UTC Aerospace Systems service bulletin 47200- - - 32- - - 146), proceed to step 10.
(b) If the steering motor part number or serial number is not in Section 1A, Part A of VSB 47200- - - 32- - - 146, it must be removed, while the NLG is in the up and locked position with doors disconnected remove the cotter pin on the lower bolt of the steering motor and proceed to step 4 (this cotter pin is hard to access when the gear is extended).
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SERVICE BULLETIN 84- - -32- - -164 S.B. 84- - - 32- - - 164 P a g e8o f8 JV 20 Apr 2020 Revision ’A’ 13 May 2021
(4) Extend the NLG via the Alternate extension (refer to AMM TASK 32- - - 31- - - 00- - - 867- - - 802).
(5) Remove the steering motor (refer to AMM TASK 32- - - 51- - - 31- - - 000- - - 801) and return it to Collins - - - Customer Services for corrective action (refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146)
(6) Install the new steering motor P/N RS1267- - -5 (refer to AMM TASK 32- - - 51- - - 31- - - 400- - - 801).
(7) Retract the NLG. (refer to the applicable instructions in AMM TASK 32- - - 31- - - 00- - - 867- - - 802).
(8) Install the cotter pin that was removed in step 3 (b).
(9) Re- - -identify the gearbox assembly and dressed shock strut assembly (refer to the enclosed UTC Aerospace Systems Service Bulletin 47200- - - 32- - - 146).
NOTE: T o re- - -identify the gearbox assembly and dressed shock strut the NLG must be in the retracted position.
(10) Extend the NLG via the Alternate extension (refer to AMM TASK 32- - - 31- - - 00- - - 867- - - 802).
(11) Install the NLG Aft Doors connecting rods (refer to the AMM TASK 32- - - 22- - - 06- - - 400- - - 801)
(12) Do the operational test of the nose wheel steering system (refer to AMM TASK 32- - - 51- - - 00- - - 710- - - 801), if the steering motor was replaced.
(13) Do the Close Out.
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). If only part of this ModSum is completed, use only this service bulletin number as reference and detail exact limit of work completed. Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin.
1 DHC Merged Document SB84-32-164A_13 May 2021 & UTC AEROSPACE SYSTEMS VSB 47200-32-146R0_MAR30/20 Page 10 of 17
Landing Systems - Landing Gear Goodrich Aerospace Canada Ltd 1400 South Service Road West Oakville, Ontario L6L 5Y7 Canada Tel: +1 905 825 1515 Fax: +1 905 825 1583 www.customers.utcaerospacesystems.com CAGE: 02121
SERVICE BULLETIN Page 1 of 7 Mar 30/20
EXPORT CLASSIFICATION U.S. Export Classification: EAR ECCN - 9E991 EIPA Export Classification: NSCanR
PROPRIETARY INFORMATION THIS DOCUMENT IS THE PROPERTY OF UTC AEROSPACE SYSTEMS. YOU MAY NOT POSSESS, USE, COPY OR DISCLOSE THIS DOCUMENT OR ANY
INFORMATION IN IT, FOR ANY PURPOSE, INCLUDING WITHOUT LIMITATION, TO DESIGN, MANUFACTURE OR REPAIR PARTS, OR OBTAIN ANY GOVERNMENT APPROVAL TO DO SO, WITHOUT UTC AEROSPACE SYSTEM'S EXPRESS WRITTEN PERMISSION. NEITHER RECEIPT NOR POSSESSION OF THIS DOCUMENT ALONE, FROM ANY SOURCE, CONSTITUTES SUCH PERMISSION. POSSESSION, USE, COPYING OR DISCLOSURE BY ANYONE WITHOUT UTC AEROSPACE SYSTEM'S EXPRESS WRITTEN PERMISSION IS NOT AUTHORIZED AND MAY RESULT IN CRIMINAL AND/OR CIVIL LIABILITY.
47200-32-146 LANDING GEAR - NOSE WHEEL STEERING - HYDRAULIC MOTOR – LOSS OF
CONFIGURATION CONTROL - MOTOR JAM DUE TO WEAR
1. PLANNING INFORMATION A. Effectivity Part A All Dressed NLG Shock Strut Assemblies with steering motor PN RS1267-3 serial numbers 379 and Sub installed or the following serial number motors which have been upgraded during shop visit:
49W2T 49W4D 49W4W 081021 0160 0219 0296 0343 49W3L 49W4F 49W4Y 0084 0167 0223 0300 0348 49W3M 49W4G KX97D 0097 0169 0247 0307 0357 49W3N 49W4J KX97H 0103 0170 0255 0317 0364 49W3P 49W4K KX9WU 0110 0171 0260 0321 0370 49W3R 49W4L 0008 0114 0175 0276 0326 0371 49W3T 49W4M 0041 0141 0176 0277 0327 49W3W 49W4P 0062 0145 0185 0278 0329 49W4B 49W4R 0072 0152 0198 0281 0331 49W4C 49W4T 0073 0157 0203 0285 0340
Part B All Dressed NLG Shock Strut Assemblies with steering motor PN RS1267-1, RS1267-1 MOD SB 32-13, RS1267-2, RS1267-2 MOD SB 32-13 or RS1267-3 with serial number not listed in Part A installed.
B. Concurrent Requirements None.
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Page 2/7 Mar 30/20
UTC AEROSPACE SYSTEMS PROPRIETARY U.S. Export Classification: EAR ECCN - 9E991 EIPA Export Classification: NSCanR 47200-32-146 C. Reason Part A The motor supplier initiated a change in shoe design on the RS1267 steering motor to improve retention and prevent wear, Excessive wear on the shoes can lead to a motor jam. The supplier did not change the part number of the motor during this product improvement. This SB will re-identify those steering motors by serial number that need to be re-identified with a new part number.
Part B Product improvement introducing a new steering motor RS1267-5 to prevent steering motor jam and restores configuration control.
D. Description Part A Carry out re-identification of the steering motor RS1267-3 to RS1267-5 if the motor is on the list of serial numbers published in this Service Bulletin, also re-identify the gearbox assembly and dressed shock strut assembly.
Part B Replace all RS1267-1, RS1267-1 MOD SB 32-13, RS1267-2, RS1267-2 MOD SB 32-13 and RS1267-3 steering motors not identified in part A with new RS1267-5 and re-identify the gearbox assembly and dressed shock strut assembly.
E. Compliance Goodrich Aerospace Canada Ltd recommends incorporation of this bulletin at operator’s earliest convenience.
F. Approval The technical content of this Service Bulletin has been reviewed and accepted by De Havilland Aircraft of Canada Limited.
G. Manpower NA H. Weight and Balance NA I. Electrical Load Data NA J. Software Accomplishment Summary Does not apply.
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