Bombardier Service Bulletin 84-32-108

T x L t r S B 8 4 --- 3 2 --- 1 0 8 Page 1 of 2 Revision ‘A’ 01 Oct 2012 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 0 8 Landing Gear - - - MLG Door Actuator - - - Incorrect Scraper Installation - - - Special Inspection and Rectification This page transmits Bombardier PDF Merged Document SB 84- - -32- - -108 Revision ‘A’ dated: 01 Oct 2012 & Goodrich VSB 46830- - -32- - -106 Revision 1 dated: Sep 12/12 This service bulletin is re- - -issued in its entirety for the reasons that follow:

--- t h eEffectivity section is revised to include MLG door actuator affected serial numbers --- t h eDescription, Material - - - Price and Availability, Existing Parts Accountability and ACCOMPLISHMENT INSTRUCTIONS sections have been revised to show latest issue of Goodrich service bulletin --- t h eReferences section is revised to convey the latest revision of the service bulletin and engineering documentation

- - - Goodrich VSB 46830- - -32- - -106 has been revised 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 Bombardier PDF Merged Document SB 84- - -32- - -108_06 Sep 2012 & Goodrich VSB 46830- - -32- - -106_Aug 24/12 and replace with attached.

Previous issues of Bombardier PDF Merged Document SB 84- - -32- - -108 & Goodrich VSB 46830- - -32- - -106:

Initial issue - - - Pages 1 thru 20 dated 06 Sep 2012 & Aug 24/12 respectively.

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D S.B. 84- - -32- - -108 Page 1 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 JR

SERVICE BULLETIN Customer Support ATA SYSTEM: 3212 NUMBER: 84- - -32- - -108

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 - - - MLG Door Actuator - - - Incorrect Scraper Installation

- - - Special Inspection and Rectification

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected:

In- - -Service: DHC- - -8 Aircraft Models 401 and 402 Serial Numbers 4001 thru 4415 with Main Landing Gear Door Actuator Assembly P/N 46830- - -7 containing the following serial numbers:

MAL- - -NMC0001 to MAL- - -NMC0006, MAL- - -NMC0008 to MAL- - -NMC0010, MAL- - -NMC0012 to MAL- - -NMC0019, MAL- - -NMC0021, MAL- - -NMC0031, MAL- - -NMC0033, MAL- - -NMC0039, MAL- - -NMC0040, MAL- - -NMC0042, MAL- - -NMC0045 to MAL- - -NMC0052, MAL- - -NMC0054, MAL- - -NMC0056 to MAL- - -NMC0074, MAL- - -NMC0076 to MAL- - -NMC0078, MAL- - -NMC0080, MAL- - -NMC0082, MAL- - -NMC0086 to MAL- - -NMC0089, MAL- - -NMC0094 to MAL- - -NMC0100, MAL- - -NMC0102, MAL- - -NMC0103, MAL- - -NMC0105, MAL- - -NMC0107 to MAL- - -NMC0109, MAL- - -NMC0112, MAL- - -NMC0127, MAL- - -NMC0150.

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.

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S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 0 8 S.B. 84- - -32- - -108 Page 2 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 JR Spares Affected:

The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts.

Part Number Description 46830- - -7 MLG Door Actuator B. Reason Problem: The main landing gear door actuator P/N 46830- - -7 may have had the scraper installed backwards. If the scraper is installed backwards, the function of the actuator may be adversely affected.

Solution: This service bulletin provides instructions for an inspection and rectification for aircraft that have a suspect unit.

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 MLG door actuator in each nacelle is inspected to determine if it carries a specific serial number as per the effectivity section of Goodrich Service Bulletin 46830- - -32- - -106 R1

- - - if aircraft does not have a matching serial number the aircraft can be returned to service

- - - affected aircraft will require repeat inspections until affected unit is replaced

- - - if aircraft has an affected unit, it must be replaced

- - - close out.

D. Compliance Bombardier Inc. recommends incorporation of this service bulletin at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority.

Transport Canada Airworthiness Directive Pending Bombardier PDF Merged Document SB 84-32-108A_01 Oct 2012 & Goodrich VSB 46830-32-106 R1_Sep 12/12 4 of 24

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 0 8 S.B. 84- - -32- - -108 Page 3 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 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 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).

F. M a n p o w e r

PART A - - - INSPECTION It will take an estimated .75 man- - -hours to complete PART A of the ACCOMPLISHMENT instructions in this s ervice bulletin. The breakdown of 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 in Part A 0.25 T e s t/R T S 0.00 Close- - -Out 0.25

PART B - - - ACTUATOR REPLACEMENT It will take an estimated 16.5 man- - -hours to complete PART B of the ACCOMPLISHMENT instructions in this s ervice bulletin. The breakdown of 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 in Part B 15.00* T e s t/R T S 1.00 Close- - -Out 0.25 * LH side 9 hours, RH side 6 hours.

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 T echnical Help Desk by telephone at 416- - -375- - -4000 or email at: thd.qseries@aero.bombardier.com Bombardier PDF Merged Document SB 84-32-108A_01 Oct 2012 & Goodrich VSB 46830-32-106 R1_Sep 12/12 5 of 24

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 0 8 S.B. 84- - -32- - -108 Page 4 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 JR G. Material - - - Price and Availability Refer to Goodrich Landing Gear Division service bulletin 46830- - -32- - -106 R1 H. T ooling - - - Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected None L. References Revision ‘A’ of this service bulletin was prepared to the engineering drawings and related data that follows:

PCA 44332 Revision 0 (for internal reference only) Goodrich Landing Gear Division service bulletin 46830- - -32- - -106 R1 dated: Sep 12/12 Transport Canada Airworthiness Directive Pending

2. MATERIAL INFORMA TION A. Parts Required Per Aircraft

(1) Detailed Parts List:

Quantity Per Aircraft Part Number Description Remarks 2 NAS1611- - -123 or Seal Bombardier PDF Merged Document SB 84-32-108A_01 Oct 2012 & Goodrich VSB 46830-32-106 R1_Sep 12/12 6 of 24

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 0 8 S.B. 84- - -32- - -108 Page 5 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 JR Quantity Per Aircraft RemarksDescriptionPart Number 2- - -123E515- - -80 2 7115FS- - -954- - -P4 Seal 2 R2301- - -017S041 Seal, MSE B. Parts Required to Modify Spares Quantity Per Aircraft Part Number Description Remarks 2 NAS1611- - -123 or Seal 2- - -123E515- - -80 2 7115FS- - -954- - -P4 Seal 2 R2301- - -017S041 Seal, MSE C. Special T ools and Equipment Required TOOL NO. NOMENCLATURE MANUFACTURER USE AT 31846 Assembly T ool Goodrich Installation/removal of gland nut TF 31847 Te s t F i x t u r e Goodrich Landing Gear Secure actuator assembly during testing Force Gauge Commercially Available D. Existing Parts Accountability Refer to Goodrich Landing Gear Division service bulletin 46830- - -32- - -106 R1

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 ’ S 2 4 --- 0 0 --- 0 0 --- 8 6 1 --- 8 0 2 a n d 24- - -00- - -00- - -910- - -801).

(2) Make sure the nose gear ground lock is engaged.

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(3) Make sure that lock pins are installed through each main gear and main gear door mechanism.

(4) Set up work platforms or ladders as required to gain access to MLG door actuator in each nacelle. Make sure work platforms or ladders are electrically grounded.

(5) Check aircraft logbooks or the MLG door actuator in each nacelle to determine if it carries any of the serial numbers stated in the effectivity section of Goodrich Service Bulletin 46830- - -32- - -106 R1.

(6) If actuators do not match any of the serial numbers, go to Close Out section of this service bulletin and return aircraft to service.

(7) If any actuator serial number matches the effectivity on Goodrich Service Bulletin 46830- - -32- - -106 R1, go to PART A - - - INSPECTION of this service bulletin.

B. Procedure

P A R T A ---INSPECTION

(1) Remove lockpins from the main landing gear doors and close the doors.

(2) Open the MLG bypass door in the flight compartment ceiling, with a force gauge attached pull the alternate release handle to open the MLG doors, the approximate pull force to release the MLG aft doors is 52 lbf.

(3) If the doors do not release easily and the force exceeds 67 lbf, the MLG aft door actuator will need to be replaced, go to PART B of this service bulletin.

P A R T B --- A C T U A T O RREPLACEMENT

(1) Make sure that lock pins are installed through each main gear and main gear door mechanism.

NOTE: Actuator is to be replaced with a unit supplied by Goodrich or reworked in accordance with the enclosed procedure.

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 .

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 .

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(2) Remove the MLG Doors Actuator. Refer to Appendix A at the back of this service bulletin.

NOTE: It may be necessary to remove the SPU to gain additional access for the removal and installation of the MLG door actuator on the left hand nacelle. Ref AMM tasks 29- - -11- - -36- - -000- - -801 & 29- - -11- - -36- - -400- - -801.

(3) Rework MLG Doors Actuator as follows: (Refer to Figure 1)

(a) Cut lock wire and remove two flat fillister head screws (20) and lock tab

(30).

(b) Cut lock wire and loosen jam nut (50). Remove rod end assembly from piston (140) and remove jam nut (50) and lock key (40).

(c) Using tool AT 31846, remove gland nut (100).

NOTE: Do not remove piston 46835- - -1 (140) from actuator cylinder assembly.

(d) Remove seals M83461/1- - -123 (110), 7115FS- - -954- - -P4 (120) and R2301- - -017S041 (130) from gland nut.

(e) Install new seals NAS1611- - -123 (110) or 2- - -123E515- - -80 (110) and 7115FS- - -954- - -P4 (120) to gland nut 46833- - -1 (100).

(f) Install new seal R2301- - -017S041 (130) to gland nut 46833- - -1 (100). Refer to Figure 2 for correct seal orientation.

(g) Install gland nut (100) over the piston (140). Using tool AT 31846, thread and torque gland nut (100), 200 - - - 250 in. lbs.

(h) Assemble jam nut (50) onto rod end assembly. Thread rod end assembly onto piston rod (140).

(i) Install actuator assembly into test fixture TF- - -31847. Push piston (140) down and make sure it is bottomed. Measure the fully retracted length and adjust rod end assembly as required (7.802 - - - 7.822 inches) retracted length.

(j) If necessary, adjust rod end assembly one quarter turn at a time. Make sure the actuator meets retract and extend length requirements.

NOTE: Make sure locking features in the rod end assembly and the piston are aligned. Do not fully tighten the jam nut.

(k) Pull the piston (140) and measure the fully extended length (11.33 - - - 11.37 inches).

NOTE: The difference between the two measurements shall be the actual stroke.

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(l) Install rod end lock key (40) and torque jam nut (50), 160 - - - 190 in. lbs.

(m) Disconnect and remove actuator assembly from test fixture.

(n) Install lock tab (30) and secure with two flat fillister head screws (20).

T orque screws (20).

(o) Vibropeen SB 32- - -106 and date accomplished in the MOD STATUS field of nameplate (10).

CAUTION: DO NOT LETTER STAMP NAMEPLATE ON ASSEMBL Y . THIS CAN DAMAGE ASSEMBL Y .

(4) Install the MLG Doors Actuator. Refer to Appendix B at the back of this service bulletin.

(5) Bleed the No. 2 Hydraulic System. Refer to AMM T ask 29- - -10- - -00- - -870- - -802.

(6) Remove the lockpins from the door mechanism of the MLG.

(7) Do an operational check of the Main Landing Gear aft door actuator as follows:

(a) Pressurize hydraulic system #2. Refer to AMM T ask 29- - -00- - -00- - -863- - -801.

(b) Make sure the amber LDG door light on the LDG gear selector panel extinguishes and the MLG doors are closed.

(c) In the flight compartment ceiling, set the landing- - -gear inhibit switch to the INHIBIT position.

(d) Make sure that the amber lights on the LDG selector panel illuminate and the MLG doors open.

(e) Set the landing- - -gear inhibit switch to the NORMAL position make sure the amber LDG door lights extinguish and the MLG doors close.

(f) Repeat the above check 3 times to help bleed the hydraulic system.

(g) Check for leaks.

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- - -108 Landing Gear - - - MLG Door Actuator - - - Incorrect Scraper Installation - - - Special Inspection and Rectification accomplished.”

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• 220 250 270 180 160 150 200 230 190 130 100 80 4683201B Door Actuator Assembly Figure 1 06 Sep 2012 S.B. 84-32-108 Revision 'A' 01 Oct 2012 Page 9 of 16 JR

S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 0 8 S.B. 84- - -32- - -108 Page 10 of 16 06 Sep 2012 Revision ‘A’ 01 Oct 2012 JR Scraper Installation Figure 2 GLAND NUT (100) SEAL (SCRAPER) R2301- - -017S041 (130) PISTON (140) Bombardier PDF Merged Document SB 84-32-108A_01 Oct 2012 & Goodrich VSB 46830-32-106 R1_Sep 12/12 12 of 24