# 49000 - 32 - 46 R2



# SERVICE BULLETIN

HIGHLIGHTS Nov 11 /11 P age 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 4 9 0 00

- 32

- 46 Revision 2 supers edes Service Bulletin 4 9 0 00

- 32

- 46 Revision 1 dated Jan 10 /08 and is reissued in its entirety with the changes listed below.
N o additional rework is introduced by this revision. Please destroy all copies of SB 4 9 0 00

- 32

- 46 R1 dated Jan 10 /08

.

Page/Para Change

Page 1 , Section I , Para 1

. Part Number/ Serial N umber 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 7 00 /900

– MAIN LANDING GEAR DRESSED SHOCK STRUT RETRACT ACTUATOR BRACKET ASSEMBLY , OUTER CYLINDER LUGS AND

ASSOCIATED PINS

– INSPECTION /REPLACEMENT

----------------------------------------------------------------------------------------------------------------------------- --------- 

### SECTION I - PLANNING INFORMATION
1. EFFECTIVITY Retract Actuator Bracket PN 49120

- 5/

- 7/

- 9/

- 11, serial numbers as follows: M K0001 thr u MK0137 and MK030151 thr u SN MK030347 (LH) Retract Actuator Bracket PN 49120

- 6/

- 8/

- 10/

- 12, serial numbers as follows: MK0001 thr u MK0134 and MK035001 thr u SN MK035180 (RH) Installed as original equipment on MLG Dressed Shock Struts PN 49000

- 5 through PN 49000

- 27 with serial numbers MA0007 t hru MA0431 (LH), MLG Dressed Shock Struts PN 49000

- 6 through PN 49000

- 28 with serial numbers MA0007 t hru MA0432 (RH) and M LG Dressed Shock Struts PN 49050

- 5 through PN 49050

- 1 1 with serial numbers MA0039 t hru MA 1231 (LH), M LG Dressed Shock Struts PN 49050

- 6 through PN 49050

- 1 2 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 T his 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 r etract 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 manhour s 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 1 1

. ELECTRICAL LOAD DATA NA 1 2

. REFERENCES Goodrich Landing Gear Compo nent Maintenance Manual 32

- 11

- 05 Goodrich Landing Gear Component Maintenance Manual 32

- 11

- 06 Goodrich Landing Gear Service Information Letter (SIL) 02121

- 32

- 51 1 3

. OTHER PUBLICATIONS AFFECTED Goodrich Landing Gear Component Maintenance Manual 32

- 11

- 05 Goodrich Landing Gear Component Maintenance Manual 32

- 11

- 06

----------------------------------------------------------------------------------------------------------------------------- ---------

# 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. D isassembly 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 e vidence of corrosion is found

. C. Inspect outer cylinder mating lugs for evidence of corrosion. If corrosi on is found, remove corrosion fro m 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. R eidentif ication Vibropeen incorporation of service bulletin 32

- 46 and date accomplished in the MOD STATUS field of nameplate (3

- 10).



### -----------------------------------------------------------------------------------------------------------------------

# 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 Act uator 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 inspecti on 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