49000-32-46 R2

SERVICE BULLETIN

HIGHLIGHTS

Nov 11/11

Page 1 of 1

THESE COMMODITIES, SOFTWARE OR TECHNOLOGY WERE EXPORTED/RE-EXPORTED IN ACCORDANCE WITH U.S. EXPORT 

ADMINISTRATION REGULATION. DIVERSION CONTRARY TO U.S. LAW IS PROHIBITED.

CRJ 700/900– MAIN LANDING GEAR DRESSED SHOCK STRUT

RETRACT ACTUATOR BRACKET ASSEMBLY, OUTER CYLINDER LUGS AND 

ASSOCIATED PINS– INSPECTION/REPLACEMENT

REVISION NO. 2 – November 11, 2011

Service Bulletin 49000-32-46 Revision 2 supersedes Service Bulletin 49000-32-46 Revision 1 dated 

Jan 10/08 and is reissued in its entirety with the changes listed below.

No additional rework is introduced by this revision.

Please destroy all copies of SB 49000-32-46 R1 dated Jan 10/08.

Page/Para Change

Page 1, Section I, Para 1. Part Number/Serial Number effectivity revised.

Page 2, Section I, Para. 6, Updated.

Page 2, Section I, Para. 8, Para 12 Commercial information revised, reference 

information updated.

Page 4, Section III Material Information updated.

49000-32-46 R2

SERVICE BULLETIN

Nov 11/11

Page 1 of 5

THESE COMMODITIES, SOFTWARE OR TECHNOLOGY WERE EXPORTED/RE-EXPORTED IN ACCORDANCE WITH U.S. EXPORT ADMINISTRATION REGULATION. 

DIVERSION CONTRARY TO U.S. LAW IS PROHIBITED.

Reference Goodrich CMM for proprietary information

CRJ 700/900– MAIN LANDING GEAR DRESSED SHOCK STRUT

RETRACT ACTUATOR BRACKET ASSEMBLY, OUTER CYLINDER LUGS AND 

ASSOCIATED PINS– INSPECTION/REPLACEMENT

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SECTION I - PLANNING INFORMATION

1. EFFECTIVITY

Retract Actuator Bracket PN 49120-5/-7/-9/-11, serial numbers as follows:

MK0001 thru MK0137 and MK030151 thru SN MK030347 (LH)

Retract Actuator Bracket PN 49120-6/-8/-10/-12, serial numbers as follows:

MK0001 thru MK0134 and MK035001 thru SN MK035180 (RH)

Installed as original equipment on

MLG Dressed Shock Struts PN 49000-5 through PN 49000-27 with serial numbers 

MA0007 thru MA0431 (LH), 

MLG Dressed Shock Struts PN 49000-6 through PN 49000-28 with serial numbers 

MA0007 thru MA0432 (RH) and 

MLG Dressed Shock Struts PN 49050-5 through PN 49050-11 with serial numbers

MA0039 thru MA1231 (LH), 

MLG Dressed Shock Struts PN 49050-6 through PN 49050-12 with serial numbers

MA0039 thru MA1234 (RH)

2. CONCURRENT REQUIREMENTS

NA

3. REASON

Problem/Condition

Premature corrosion has been found at the retract actuator bracket assembly PN 49120,

bushing/lug interface and at the mating lugs on the outer cylinder.

Objective/Benefit

This service bulletin is issued to give inspection criteria for the retract actuator bracket 

assembly, associated pins and the mating lugs on the outer cylinder, and to provide 

instructions for enhanced corrosion protection.

4. DESCRIPTION

The retract actuator bracket assembly and associated pins are removed from the shock strut

and inspected. 

Corroded retract actuator bracket assemblies and pins are replaced. 

Outer cylinder lugs with evidence of corrosion are reworked per the Component Maintenance 

Manual.
49000-32-46 R2

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Nov 11/11

Page 2 of 5

Reference Goodrich CMM for proprietary information

5. COMPLIANCE

Goodrich Landing Gear recommends incorporation of this bulletin at operator’s earliest 

convenience.

6. APPROVAL

The technical content of this Service Bulletin has been approved under the authority of the 

TCCA Design Approval Organization No DAO#93-Q-02.

7. MANPOWER

Approximately 2.0 manhours are required to accomplish this service bulletin.

8. MATERIAL COST AND AVAILABILITY

Refer to Goodrich Landing Gear Service Information Letter (SIL 02121-32-51) for commercial 

terms related to this Service Bulletin.

Return parts for repair to:

Goodrich Corporation Tele: 1-704-282-2549

Customer Services Fax: 1-704-290-5959

4115 Corporate Center Drive

Monroe, NC 28110-1313, ATT: Customer Services Administrator

USA

9. TOOLING

NA

10. WEIGHT AND BALANCE

NA

11. ELECTRICAL LOAD DATA

NA

12. REFERENCES

Goodrich Landing Gear Component Maintenance Manual 32-11-05

Goodrich Landing Gear Component Maintenance Manual 32-11-06

Goodrich Landing Gear Service Information Letter (SIL) 02121-32-51

13. OTHER PUBLICATIONS AFFECTED

Goodrich Landing Gear Component Maintenance Manual 32-11-05

Goodrich Landing Gear Component Maintenance Manual 32-11-06

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49000-32-46 R2

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Nov 11/11

Page 3 of 5

Reference Goodrich CMM for proprietary information

SECTION II - ACCOMPLISHMENT INSTRUCTIONS

NOTE: Item numbers in parenthesis () refer to CMM 32-11-05/-06 IPL Figure-Item number.

1. Disassembly

A. Remove retract actuator pin (2-1290), auxiliary actuator pin (2-1330), inboard retract 

actuator bracket pin (2-1380) and outboard retract actuator bracket pin (2-1420). 

Remove retract bracket assembly (2-1340) from the shock strut (Ref CMM 32-11-05/-6 

DISASSEMBLY).

2. Inspection

A. Inspect pins (2-1290), (2-1330), (2-1380) and (2-1420) for chrome damage and/or 

evidence of corrosion.

(1) Replace pins with chrome damage and/or evidence of corrosion.

NOTE: Corrosion staining on shank of pins may be removed by light polishing 

with an abrasive pad (scotch-brite or equivalent).

B. Inspect retract actuator bracket assembly (Ref. Fig 1):

(1) Inspect all bushing contact areas and lugs where retract actuator bracket 

assembly mates with actuator pins and outer cylinder lugs.

(2) Replace retract actuator bracket assembly if evidence of corrosion is found.

C. Inspect outer cylinder mating lugs for evidence of corrosion. If corrosion is found, 

remove corrosion from lugs per CMM 32-11-05/06, REPAIR.

D. If no evidence of corrosion is present, assemble the shock strut (Refer to Para 3).

3. Assembly

A. Install retract actuator bracket assembly and associated pins on the shock strut (Refer 

to CMM 32-11-05/-06, ASSEMBLY)

4. Reidentification

Vibropeen incorporation of service bulletin 32-46 and date accomplished in the MOD 

STATUS field of nameplate (3-10).

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49000-32-46 R2

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Nov 11/11

Page 4 of 5

Reference Goodrich CMM for proprietary information

SECTION III - MATERIAL INFORMATION

New P/N Qty* Keyword Old P/N Qty Disposition

**49106-5 1 Inboard Pin, 49106-3/-5 1 Return to Goodrich

Retract Act.

**49113-1 1 Inboard Pin, 49113-1 1 Return to Goodrich

Auxiliary Act.

**49120-11 1 Retract Actuator 49120-5/-7 1 Discard

Bracket Assy

**49120-12 1 Retract Actuator 49120-6/-8 1 Discard

Bracket Assy

**49120-9 1 Retract Actuator 49120-9 1 Return to Goodrich

Bracket Assy

**49120-10 1 Retract Actuator 49120-10 1 Return to Goodrich

Bracket Assy

**49120-11 1 Retract Actuator 49120-11 1 Return to Goodrich

Bracket Assy

**49120-12 1 Retract Actuator 49120-12 1 Return to Goodrich

Bracket Assy

**49131-3 1 Inboard Pin, 49131-1/-3 1 Return to Goodrich

Retract Actuator

Bracket Assy

**49132-1 1 Outboard Pin 49132-1 1 Return to Goodrich

Retract Actuator

Bracket Assy

NOTE: Retract Actuator Bracket 49120-9/-10 can only be used for dressed shock struts 49000-

17/-18 and earlier.

* Qty per MLG

** Only required if inspection reveals evidence of corrosion
49000-32-46 R2

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Nov 11/11

Page 5 of 5

Reference Goodrich CMM for proprietary information

Inspection of Lugs and Pins

Figure 1