49600-32-64 R3

SERVICE BULLETIN

HIGHLIGHTS

Dec 15/11

Page 1 of 1

CRJ MAIN LANDING GEAR 

RETRACTION ACTUATOR ASSEMBLY – INTRODUCTION OF NEW CONFIGURATION

REVISION NO. 3 – December 15, 2011

Service Bulletin 49600-32-64 Revision 3 supersedes Service Bulletin 49600-32-64 R2 dated Jun

17/11 and is reissued in its entirety with the changes listed below.

The compliance in the previous issue of this Service Bulletin is not affected by this revision. No 

additional rework is introduced by this revision.

Please destroy all copies of SB 49600-32-64 R2 dated Jun 17/11.

Page/Para Change

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

information updated.

Page 2, Section II, Para 1H. Required corrosion inhibiting compound revised 

and warning deleted.

Page 3, Section II, Para 2B. Optional marking method for service bulletin 

incorporation added.

49600-32-64 R3 

SERVICE BULLETIN

Dec 15/11

Page 1 of 3

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 MAIN LANDING GEAR

RETRACTION ACTUATOR ASSEMBLY – INTRODUCTION OF NEW CONFIGURATION

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SECTION I - PLANNING INFORMATION

1. EFFECTIVITY

Retraction Actuator Assembly PN 49600-5/ -7/ -11, SN SPP0001 to SPP0388 and 

SPP020389 to SPP021300 and SPP011301 to SPP011318, SPP011355 and 

SPP011356.

2. CONCURRENT REQUIREMENTS

NA

3. REASON

Problem/Condition

A potential exists for rod end play and subsequent wear on rod end threads on the retraction

actuator assembly.

Enhanced corrosion protection is required at mating threads of lock nut/gland nut interface.

Objective/Benefit

This service bulletin is issued to introduce retract actuator assembly PN 49600-13 with rod end 

jam nut made from CRES and includes assembly with corrosion inhibiting compound applied 

to the gland nut threads.

4. DESCRIPTION

The retract actuator assembly is reworked and reidentified.

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

No additional man-hours are required to accomplish this Service Bulletin at next shop visit. 

Approximately 2.0 man-hours are required to do this Service Bulletin.
49600-32-64 R3 

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Dec 15/11

Page 2 of 3

Reference Goodrich CMM for proprietary information

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.

Order parts as required from:

Goodrich Landing Gear Tel: 1-905-827-7777

1400 South Service Rd, Fax: 1-905-825-1583

Oakville, Ontario, Canada

L6L 5Y7 Att: Spares Administrator

9. TOOLING

Goodrich Landing Gear has a rotable pool of Assembly Fixture AT-56761 and Test Fixture 

TF 57376 available from the address shown in Para. 8 above.

10. WEIGHT AND BALANCE

NA

11. ELECTRICAL LOAD DATA

NA

12. REFERENCES

Goodrich Landing Gear Component Maintenance Manual 32-11-28

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

13. OTHER PUBLICATIONS AFFECTED

Goodrich Landing Gear Component Maintenance Manual 32-11-28

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SECTION II - ACCOMPLISHMENT INSTRUCTIONS

NOTE: Item numbers in parenthesis () refer to CMM 32-11-28 IPL Figure-Item number.

1. Rework

A. Install retraction actuator assembly in fixture (AT-56761), unlock cup washer (1-110).

B. Loosen and remove lock nut (1-100).

NOTE: Do not remove gland nut (1-130) from cylinder (1-280).

C. Remove jam nut (1-70) from rod end (1-80). Discard jam nut (1-70) (Ref. CMM 32-11-28 

DISASSEMBLY).

D. Clean threads with solvent and a lint free cloth.

E. Apply corrosion inhibiting compound (CA1000) to gland nut (1-130) threads.

F. Apply dry film lubricant to rod end threads per MIL-L-23398 or MIL-PRF-46010.

WARNING: DELETED

G. Apply corrosion inhibiting compound (CA 1000) to threads of piston (1-190).

H. Install jam nut PN 49606-5 on rod end.

I. Coat cup washer (1-110) with lubricant (skydrol lube, MCS 352) on face that contacts 

lock nut (1-100) and assemble retraction actuator assembly (Ref. CMM 32-11-28 

ASSEMBLY).
49600-32-64 R3 

Goodrich Landing Gear Division

Goodrich Aerospace Canada Ltd.

Dec 15/11

Page 3 of 3

Reference Goodrich CMM for proprietary information

NOTE: Do not torque jam nut at this time.

J. Use tool TF 57376 to set actuator assembly retracted length per CMM requirements 

(Ref. CMM 32-11-28 TESTING AND FAULT ISOLATION).

K. Torque jam nut PN 49606-5 and safety with lockwire per CMM requirements.

L. Apply torque seal (F925) at lock nut/gland nut interface and rod end/jam nut/piston 

interface.

M. Fillet seal all around both sides of jam nut using sealant per MIL-A-46146, MIL-PRF81733 Type II, AMS–S-8802 Class B (DC 3145, DC738 or RTV162).

2. Re-identification

A. Reidentify retraction actuator assembly PN 49600-11 as retraction actuator assembly 

PN 49600-13.

B. For all other configurations record incorporation of this service bulletin and date 

accomplished in MOD STATUS field of nameplate (1-60).

NOTE: As an option for all other configurations, it is acceptable, in addition to the MOD 

STATUS to record incorporation of this service bulletin by adding letter ‘A’ after 

the serial number on nameplate (1-60). Apply clear lacquer (Akzo 683-3-x or 

equivalent) over ink stamp.

The optional marking method does not alter the OEM serial number and 

facilitates operator tracking.

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SECTION III - MATERIAL INFORMATION

New PN Qty* Keyword Old PN Qty Disposition

49600-13 1 Retraction Actuator 49600-11 1 Rework

49606-5 1 Jam Nut 49606-3 1 Discard

49620-1 1 Cup Washer 49620-1 1 Discard