# D

S.B. 84 ---32 ---67 Page 1 of 10 08 Jul 2009 MG/LS 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3234 NUMBER: 84 ---32 ---67
SUBJECT: Landing Gear --- Alternate Extension --- MLG Emergency Cables --- Replacement Of Clevis Ends --- Special Inspection and Rectification --- ModSum 4 ---109922

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4109. Production: ModSum 4 ---109922 will be installed before delivery on applicable DHC ---8 Aircraft at Serial Number 4110 and subsequent. Spares Affected: None B. Reason Problem: Aircraft may have been delivered to an operator with an incorrect clevis installed. The clevis that attaches the MLG alternate release cable to the alternate release lever has been identified as an incorrect part (MS21252 ---3RL or MS21252 ---3LL) in lieu of the proper part (Goodrich 48508 ---1). The clevis is supposed to fit within the clevis end (Goodrich 48505) of Spring Box (Goodrich 4805), but is physically too large to fit properly and is thus fitted incorrectly. The installation of this incorrect part would also require a different length clevis pin (correct pin p/n MS20392 ---2C15) to be installed.

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 2 of 10 08 Jul 2009 MG/LS In addition, the incorrect clevis is 0.5 inches shorter than the correct Goodrich clevis resulting in minimal thread engagement with the turnbuckle. Solution: Do a special inspection of the clevis (right hand nacelle only) that attaches the MLG alternate release cable to the alternate release lever. If an incorrect clevis is found, remove the incorrect part and install the Goodrich 48508 ---1 clevis. In addition, the existing clevis pin will be changed to the correct MS20392 ---2C15 pin. The clevis in the left hand nacelle is not affected by this modification. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- access is gained to the MLG alternate release cable located in the right hand nacelle --- the clevis that attaches the MLG alternate release cable to the alternate release lever is inspected to make sure it is the correct clevis and hardware stack --- if found incorrect the clevis and clevis pin is removed and replaced with the correct clevis and clevis pin --- if required an operation test of the MLG alternate release system is done --- close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 4 ---109922 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 Organization No: DAO #93 ---Q ---02.

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 3 of 10 08 Jul 2009 MG/LS F. Manpower PART A --- Special Inspection It will take an estimated 1.00 man ---hours to complete the Special Inspection portion of the ACCOMPLISHMENT INSTRUCTIONS in this service bulletin. The breakdown of man ---hours is shown in the table that follows: TASK MAN ---HOURS Job Set ---Up 0.50 Procedure in Part A 0.50 Test / RTS N/A Close ---Out 0.50 PART B --- Rectification It will take an estimated additional 2.50 man ---hours to complete the Rectification portion of the ACCOMPLISHMENT INSTRUCTIONS in this service bulletin. The breakdown of man ---hours is shown in the table that follows: TASK MAN ---HOURS Job Set ---Up 0.50 Procedure in Part B 1.00 Test / RTS 0.50 Close ---Out 0.50 G. Material --- Price and Availability The parts detailed in Paragraph 2. A. may 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 ModSums Manual PSM 1 ---84 ---12

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### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 4 of 10 08 Jul 2009 MG/LS L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: ModSum 4Q109922 Rev. ‘B’ ModSum 4 ---109922 Rev. ‘B’ PCA 42647 Revision 0 (for internal reference only)
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft (1) Detailed Parts List:
Quantity Per Aircraft Part Number Description Remarks
1 48508 ---1 Clevis 1 MS20392 ---2C15 Clevis Pin 1 NAS1149D0316H Flat Washer 1 MS24665 ---153 Split Cotter Pin
B. Parts Required to Modify Spares None C. Special Tools 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 per next higher assembly for indented parts.

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 5 of 10 08 Jul 2009 MG/LS Existing Part Number Description Qty. IC DC New Part Number PNC MS21252 ---3RL N or Clevis 1 A SAL 48508 ---1 N MS21252 ---3LL N

--- Clevis Pin 1 A SAL MS20392 ---2C15 N

--- Flat Washer 1 A DIS NAS1149D0316H N

--- Split Cotter Pin 1 A DIS MS24665 ---153 N IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition DIS Discard 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. PNC Part Number Code N New part. R Part number after rework. S Superseding or equivalent part number. X Reworked part and superseding part are functionally and physically equivalent but not identical.

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 6 of 10 08 Jul 2009 MG/LS 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set ---Up (1) Put the aircraft into standard configuration for maintenance (refer to Aircraft Maintenance Manual (AMM) PSM 1 ---84 ---2 TASK 12 ---00 ---01 ---860 ---801). (2) Put the aircraft on jacks (refer to AMM TASK 07 ---10 ---00 ---582 ---801). B. Procedure Part A --- Special Inspection
WARNING: MAKE SURE THAT THE LANDING GEAR DOORS ARE OPENED AND LOCKED. MAKE SURE THAT LOCKPINS ARE INSTALLED THRU THE MLG AND THAT THE NOSE GEAR LOCK IS ENGAGED. THE LANDING GEAR DOORS AND THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS COULD CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT. (1) Gain access to the MLG alternate release cable located in the right hand nacelle. (2) Refer to Figure 1, Figure 2 and Figure 3 and visually inspect the clevis location of the MLG alternate extension system ---cam mechanism assembly for the correct clevis, clevis pin and hardware build ---up. (3) If the clevis and hardware buildup is correct, go to step (2) of the Close Out section and complete this service bulletin (84 ---32 ---67). (4) If the clevis and hardware buildup are incorrect, go to Part B --- Rectification and replace the existing clevis, clevis pin, washer and cotter pin with the correct parts. Part B --- Rectification (1) Remove existing cotter pin, washer and clevis pin from existing clevis (refer to Figure 3). Discard the washer and cotter pin. (2) Remove and discard existing clevis. (3) Install new clevis 48508 ---1, new clevis pin MS20392 ---2C15, new washer NAS1149D0316H and new split cotter pin MS24665 ---153 (refer to Figure 3 SECTION S ---S). (4) Do the rigging of the alternate extension MLG cables using applicable instructions in AMM 32 ---34 ---16 ---830 ---802.

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 7 of 10 08 Jul 2009 MG/LS C. Close Out (1) If the clevis, clevis pin, washer and split cotter pin have been replaced, do an operational test of the MLG alternate extension system (refer to AMM TASK 32 ---34 ---00 ---710 ---801). (2) Lower the aircraft and remove the jacks, (refer to AMM TASK 07 ---10 ---00 ---582 ---801). (3) Remove all tools and equipment from the work area. (4) On completion of this service bulletin, make the following entry in the appropriate logbooks: “Service Bulletin 84 ---32 ---67 {Alternate Extension --- MLG Emergency Cables --- Replacement Of Clevis Ends --- Special Inspection and Rectification} accomplished.”

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 8 of 10 08 Jul 2009 MG/LS Clevis Location --- Right Hand Nacelle Only Figure 1 3 1 2 4

LEGEND TO UPLOCK ASSYbrx17a01.dg, sm/ik, 01/12/00 CLEVIS LOCATION

1. Turnbuckle 2. Lever 3. Cam mechanism 4. Roller 5. Spring Box 6. Turnbuckle 5

6

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 9 of 10 08 Jul 2009 MG/LS Incorrect Clevis Installation Figure 2 NOTE: REFER TO SECTION S ---S IN FIGURE 3 FOR CORRECT HARDWARE STACK

### SERVICE BULLETIN 84 ---32 ---67

S.B. 84 ---32 ---67 Page 10 of 10 08 Jul 2009 MG/LS Correct Clevis Hardware Stack and Assembly --- Right Hand Nacelle Only Figure 3 48508 ---1 CLEVIS 48508 ---1 CLEVIS

1 1Jan 2009 SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION --- Q SERIES DASH 8 AIRCRAFT To: Partner Data Co ---Ordinator (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 3534 Facsimile: (1) 416 375 4538 E --mail: cmdb.requests@aero.bombardier.com
From: Company: Phone: Extn: Facsimile: Date:

E --mail: 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: 

# cmbd.requests@aero.bombardier.comFeb 2009 SERVICE BULLETIN (SB) --- COMMENT SHEET --- Q SERIES DASH 8 AIRCRAFT

To: SB Focal (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 4078 Facsimile: (1) 416 375 4538 E --mail: syed.rizvi@aero.bombardier.com
From: Company: Phone: Extn: Facsimile: Date:

E --mail: 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 VCompliance VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling V References V Publications Affected 2. MATERIAL INFORMATION V Kit Content VSpecial Tools/Equipment V Parts to Modify Spares V Consumables V Disposition of Existing Parts VOther
3. ACCOMPLISHMENT INSTRUCTIONS VJob Set ---Up V Procedure V Close---Out VTest 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